83 results on '"Pontificia Universidad Javeriana (COLOMBIA)"'
Search Results
2. Everyday Life and Games in the Civic Formation of Children
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Gómez-Serrudo, Nelson; Pontificia Universidad Javeriana, Colombia. and Gómez-Serrudo, Nelson; Pontificia Universidad Javeriana, Colombia.
3. La vida cotidiana y el juego en la formación ciudadana de los niños.
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Gómez-Serrudo, Nelson; Pontificia Universidad Javeriana, Colombia. and Gómez-Serrudo, Nelson; Pontificia Universidad Javeriana, Colombia.
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En este artículo se reflexiona en torno a cómo la vida cotidiana y el juego se constituyeron en las estrategias de formación ciudadana que se emplearon con los niños de las localidades de Santa Fe, La Candelaria y Suba, entre otras, dentro de los objetivos del Proyecto Nuevas voces ciudadanas, del Departamento Administrativo de Bienestar Social (DABS). El texto hace parte de la observación de algunos talleres y recorridos urbanos que se realizaron con los pequeños en el segundo semestre de 2002. Se indaga la manera como los niños asumen la dinámica urbana, en relación con los espacios de socialización y con los lugares de la sociabilidad, que determinan el carácter social de la vida pública y de la vida privada. El tema de la formación ciudadana se aborda desde la perspectiva de los derechos y la participación que los niños experimentan en escenarios públicos como la calle, el vecindario, el parque, el colegio o la escuela, donde aprenden a deliberar sobre los intereses y las necesidades de su comunidad. Un concepto fundamental que se utiliza es el de tercera zona, ese espacio propicio para que los niños exploren la creatividad, la libertad, la imaginación, el asombro y la diferencia. Por otro lado, se analiza cómo viven los niños en el ámbito de lo privado, es decir, en el espacio íntimo de la familia.
4. Evaluación de la influencia y el impacto social de la investigación a partir de indicadores altmetrics : aplicación en las revistas de la Pontificia Universidad Javeriana
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Pontificia Universidad Javeriana (Colombia), Gregorio-Chaviano, Orlando, Zamora, María-Consuelo, López-Mesa, Evony Katherine, FLórez-Carranza, Favio, García-Wilches, Luis Gabriel, Pontificia Universidad Javeriana (Colombia), Gregorio-Chaviano, Orlando, Zamora, María-Consuelo, López-Mesa, Evony Katherine, FLórez-Carranza, Favio, and García-Wilches, Luis Gabriel
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La evaluación del impacto e influencia social de la investigación, ayuda a comprender cómo el conocimiento publicado es percibido y utilizado en la sociedad, sin embargo, los métodos tradicionales de evaluación científica apenas reflejan la utilización social de la investigación. Los esquemas de valoración de la investigación han evolucionado desde criterios puramente científicos basados en citas hacia perspectivas que enfatizan tanto la relevancia científica como la social. En este contexto se espera que la investigación responda y contribuya a los desafíos y demandas de la sociedad (Wallace & Rafols, 2015). El uso de indicadores y medidas altmétricas para evaluar el impacto social de la investigación, ha sido adoptado en diversos contextos y propósitos, sin embargo, la investigación sobre altmetrics se ha centrado principalmente en la comparación con los indicadores tradicionales, tanto para entender su relevancia como las limitaciones e inconvenientes de su aplicación.
5. Patrones de citación de la producción colombiana en revistas MDPI. Un análisis desde WoS 2019-2023
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Pontificia Universidad Javeriana (Colombia), Editorial Universidad EAN (Colombia), López-Mesa, Evony-Katherine, Zamora, María-Consuelo, Gregorio-Chaviano, Orlando, Pontificia Universidad Javeriana (Colombia), Editorial Universidad EAN (Colombia), López-Mesa, Evony-Katherine, Zamora, María-Consuelo, and Gregorio-Chaviano, Orlando
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En los últimos años se han evidenciado notables cambios en los patrones de publicación científica de muchos países (Delgado López-Cózar, E., y Martín-Martín, 2023), en este escenario, las revistas depredadoras han ganado protagonismo. Este término engloba una diversidad de motivaciones presentes en los circuitos de comunicación científica actuales y la Editorial MDPI ha generado debates significativos en la actualidad, debido a sus prácticas editoriales, que algunos expertos consideran que no garantizan la suficiente rigurosidad en aras de la calidad final de los resultados. A pesar de las defensas de la editorial en este sentido, su papel en el panorama científico actual es objeto de análisis y discusión. En el contexto latinoamericano la producción en estas revistas representa alrededor del 5% de los resultados totales en la mayoría de los países. Colombia se posiciona como el cuarto país con mayor porcentaje de producción en estas revistas con alrededor del 7% con relación a su producción registrada en Web of Science y MDPI, durante el período 2019-2023. Sin embargo, es importante estudiar el impacto que reciben sus publicaciones y el origen de sus citas, para obtener información más completa que sea de utilidad para investigadores, profesores y responsables de las políticas científicas institucionales.
6. The Combination of Iron and Copper Increases Pathogenicity and Induces Proteins Related to the Main Virulence Factors in Clinical Isolates of Cryptococcus neoformans var. grubii
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Nórida Vélez, Lucía Monteoliva, Zilpa-Adriana Sánchez-Quitian, Ahinara Amador-García, Rocío García-Rodas, Andrés Ceballos-Garzón, Concha Gil, Patricia Escandón, Óscar Zaragoza, Claudia-Marcela Parra-Giraldo, Ministerio de Ciencia e Innovación (España), Ministerio de Ciencia, Innovación y Universidades (España), Instituto de Salud Carlos III, Pontificia Universidad Javeriana (Colombia), and Complutense University of Madrid (España)
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Microbiology (medical) ,Virulence ,QH301-705.5 ,Cryptococcus neoformans ,metals ,iron ,copper ,pathogenicity ,virulence ,proteins ,Iron ,Proteins ,Plant Science ,Metals ,Pathogenicity ,Parasitología ,Biology (General) ,Ecology, Evolution, Behavior and Systematics ,Copper - Abstract
In fungi, metals are associated with the expression of virulence factors. However, it is unclear whether the uptake of metals affects their pathogenicity. This study aimed to evaluate the effect of iron/copper in modulating pathogenicity and proteomic response in two clinical isolates of C. neoformans with high and low pathogenicity. Methods: In both isolates, the effect of 50 µM iron and 500 µM copper on pathogenicity, capsule induction, and melanin production was evaluated. We then performed a quantitative proteomic analysis of cytoplasmic extracts exposed to that combination. Finally, the effect on pathogenicity by iron and copper was evaluated in eight additional isolates. Results: In both isolates, the combination of iron and copper increased pathogenicity, capsule size, and melanin production. Regarding proteomic data, proteins with increased levels after iron and copper exposure were related to biological processes such as cell stress, vesicular traffic (Ap1, Vps35), cell wall structure (Och1, Ccr4, Gsk3), melanin biosynthesis (Hem15, Mln2), DNA repair (Chk1), protein transport (Mms2), SUMOylation (Uba2), and mitochondrial transport (Atm1). Increased pathogenicity by exposure to metal combination was also confirmed in 90% of the eight isolates. Conclusions: The combination of these metals enhances pathogenicity and increases the abundance of proteins related to the main virulence factors. This work was financed by the grants 7170 and 8247 from the Research Vice Presidency of the Pontificia Universidad Javeriana in Bogotá, Colombia; and by grants SAF2017-86912-R from the Spanish Ministry for Science and Innovation to the Instituto de Sanidad Carlos III, and RTI2018-094004-B-I00 from Spanish Ministry of Science, Innovation and Universities to the Universidad Complutense de Madrid. Sí
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- 2022
7. Deciphering the Association among Pathogenicity, Production and Polymorphisms of Capsule/Melanin in Clinical Isolates of Cryptococcus neoformans var. grubii VNI
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Nórida Vélez, Nelson Vega-Vela, Marina Muñoz, Paola Gómez, Patricia Escandón, Juan David Ramírez, Oscar Zaragoza, Lucía Monteoliva Diaz, Claudia-Marcela Parra-Giraldo, Pontificia Universidad Javeriana (Colombia), Universidad del Rosario (Colombia), Ministerio de Ciencia Tecnología e Innovación (Colombia), Ministerio de Ciencia, Innovación y Universidades (España), and Complutense University of Madrid (España)
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Microbiology (medical) ,Cryptococcus neoformans ,MLST ,polymorphism ,capsule ,melanin ,Biología celular ,Melanin ,Inmunología ,Plant Science ,Polymorphism ,Ecology, Evolution, Behavior and Systematics ,Capsule - Abstract
Background: Cryptococcus neoformans is an opportunistic fungal pathogen that can cause meningitis in immunocompromised individuals. The objective of this work was to study the relationship between the phenotypes and genotypes of isolates of clinical origin from different cities in Colombia. Methods: Genome classification of 29 clinical isolates of C. neoformans var. grubii was performed using multilocus sequence typing (MLST), and genomic sequencing was used to genotype protein-coding genes. Pathogenicity was assessed in a larval model, and melanin production and capsule size were evaluated in vitro and in vivo. Results: Eleven MLST sequence types (STs) were found, the most frequent being ST69 (n = 9), ST2, ST93, and ST377 (each with n = 4). In the 29 isolates, different levels of pigmentation, capsule size and pathogenicity were observed. Isolates classified as highly pathogenic showed a tendency to exhibit larger increases in capsule size. In the analysis of polymorphisms, 48 non-synonymous variants located in the predicted functional domains of 39 genes were found to be associated with capsule size change, melanin, or pathogenicity. Conclusions: No clear patterns were found in the analysis of the phenotype and genotype of Cryptococcus. However, the data suggest that the increase in capsule size is a key variable for the differentiation of pathogenic isolates, regardless of the method used for its induction. This work was financed by Grant ID 7170 of the Research Vice Presidency of the Pontificia Universidad Javeriana in Bogotá, Colombia; MINCIENCIAS call 715-2018 contract RC No. 715-2018; Dirección de Investigación e Innovación from Universidad del Rosario; and RTI2018-094004-B-I00 from the Spanish Ministry of Science, Innovation and Universities to the Universidad Complutense de Madrid. Sí
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- 2022
8. System for experimental investigation of DBD excilamps in view of control and optimization of UV emission
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Arnold Wiesner, Hubert Piquet, Rafael Diez, David Florez, Pontificia Universidad Javeriana (PUJ), Groupe ENergie Electrique et SYStémique (LAPLACE-GENESYS), LAboratoire PLasma et Conversion d'Energie (LAPLACE), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, Universidad Sergio Arboledad (COLOMBIA), Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Pontificia Universidad Javeriana (COLOMBIA), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Laboratoire Plasma et Conversion d'Energie - LAPLACE (Toulouse, France), and Institut National Polytechnique de Toulouse - INPT (FRANCE)
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Dielectric Barrier Discharge ,Energie électrique ,Electric Discharge Power Supply ,General Computer Science ,Computer science ,Excimer Lamp ,Current-mode ,010103 numerical & computational mathematics ,02 engineering and technology ,Dielectric barrier discharge ,Degrees of freedom (mechanics) ,Pulsed power ,7. Clean energy ,01 natural sciences ,Theoretical Computer Science ,law.invention ,Current Mode ,Data acquisition ,Interleaved converters ,law ,0202 electrical engineering, electronic engineering, information engineering ,Electronic engineering ,Energy transformation ,0101 mathematics ,Numerical Analysis ,Power converters ,Applied Mathematics ,[SPI.NRJ]Engineering Sciences [physics]/Electric power ,Maximization ,Ultra Violet Generation (UV) ,Amplitude ,Modeling and Simulation ,Electrical network ,020201 artificial intelligence & image processing ,DBD - Abstract
This paper presents the design of a system aimed at characterizing a diverse set of dielectric barrier discharge UV lamps. This experimental bench allows the study of the lamps performances regarding UV emission maximization and energy conversion optimization. It includes a current-mode pulsed power supply for the lamps, the design of which is detailed. This converter presents 3 degrees of freedom (DOF) can control and adjust independently the frequency, amplitude and duration of the current pulses injected into the lamps. Theoretical modeling of the lamps, by means of equivalent electrical circuits, is used to define the most interesting operating points to be explored, as well as for the converter’s design; these models are afterwards validated by experimental tests on the entire set of lamps. The operation of the bench is controlled by a supervising program: the latter manages the data acquisition and performs sweeps of the DOFs of the pulsed current. Examples of analyzes, oriented toward optimization of electric to UV energy conversion, are shown.
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- 2019
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9. Power estimation of a current supplied DBD considering the transformer parasitic elements
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Rafael Diez, Arnold Wiesner, Hubert Piquet, Vanesa Rueda, Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Pontificia Universidad Javeriana (COLOMBIA), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Laboratoire Plasma et Conversion d'Energie - LAPLACE (Toulouse, France), Pontificia Universidad Javeriana (PUJ), Groupe ENergie Electrique et SYStémique (LAPLACE-GENESYS), LAboratoire PLasma et Conversion d'Energie (LAPLACE), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, and Institut National Polytechnique de Toulouse - INPT (FRANCE)
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Dielectric Barrier Discharge ,Energie électrique ,Materials science ,Electric Discharge Power Supply ,02 engineering and technology ,Dielectric barrier discharge ,Plasma sources ,01 natural sciences ,7. Clean energy ,Capacitance ,Industrial and Manufacturing Engineering ,010305 fluids & plasmas ,law.invention ,Current Mode ,Parasitic capacitance ,law ,Electric model ,0103 physical sciences ,0202 electrical engineering, electronic engineering, information engineering ,Waveform ,Electrical and Electronic Engineering ,Transformer ,Dielectric barrier discharge (DBD) ,business.industry ,020208 electrical & electronic engineering ,[SPI.NRJ]Engineering Sciences [physics]/Electric power ,Electrical engineering ,Current source ,Inductance ,Control and Systems Engineering ,DBD ,Electric power ,business - Abstract
International audience; Power estimation of a DBD device supplied by a current source converter is studied in this article, pointing out the prominent contribution of the transformer parasitic elements. The impact of the stray capacitance and magnetizing inductance is stated and an iterative method that estimates the electrical power and DBD waveforms is presented. Results show that the magnetizing inductance can enhance the electrical power without changing the current ratings of the converter and that the stray capacitance must be minimized. Moreover, the experimental results reveal the need for a better DBD model to properly estimate the power. In consequence, an improved model is proposed and validated using a DBD excimer lamp in a wide range of electrical operating conditions.
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- 2019
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10. Impact of the Electrical Operating Point over a DBD Driven Plasma Jet
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David Florez, Hubert Piquet, Rafael Diez, Dmitry Schitz, Pontificia Universidad Javeriana (COLOMBIA), Immanuel Kant Baltic Federal University (RUSSIA), LAboratoire PLasma et Conversion d'Energie (LAPLACE), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, Pontificia Universidad Javeriana Bogota, Colombia, Pontificia Universidad Javeriana (PUJ), Groupe ENergie Electrique et SYStémique (LAPLACE-GENESYS), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), and Immanuel Kant Baltic Federal University (IKBFU)
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Dielectric Barrier Discharge ,Electric Discharge Power Supply ,Materials science ,Astrophysics::High Energy Astrophysical Phenomena ,02 engineering and technology ,Dielectric barrier discharge ,Nonthermal plasma ,01 natural sciences ,7. Clean energy ,Helium plasma ,010305 fluids & plasmas ,Current Mode ,[SPI]Engineering Sciences [physics] ,0103 physical sciences ,Homogeneity (physics) ,0202 electrical engineering, electronic engineering, information engineering ,ComputingMilieux_MISCELLANEOUS ,Operating point ,020208 electrical & electronic engineering ,[SPI.NRJ]Engineering Sciences [physics]/Electric power ,[SPI.PLASMA]Engineering Sciences [physics]/Plasmas ,Plasma jet ,Mechanics ,Volumetric flow rate ,Voltage Mode ,Homogeneous ,Plasma Jet ,DBD ,High Energy Physics::Experiment - Abstract
A Dielectric Barrier Discharge driven cold plasma jet is ignited using three different power supplies to experimentally study the impact of the electrical operating point over several jet characteristics. The characteristics under study are the homogeneity of the jet and the gas temperature. Additionally, the jet reactor is operated at different gas flow rates. The power injected into the jet is in the 0,2 – 5 Watts range. From the obtained results the operating conditions allowing to obtain a homogeneous low temperature jet, required for biomedical applications, are found.
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- 2019
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11. Parametric study of dielectric barrier discharge excimer UV lamps supplied with controlled square current pulses
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Hubert Piquet, Rafael Diez, Antoine Belinger, David Florez, Arnold Wiesner, Groupe ENergie Electrique et SYStémique (LAPLACE-GENESYS), LAboratoire PLasma et Conversion d'Energie (LAPLACE), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, Pontificia Universidad Javeriana (PUJ), Matériaux et Procédés Plasmas (LAPLACE-MPP), Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Pontificia Universidad Javeriana (COLOMBIA), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), and Institut National Polytechnique de Toulouse - INPT (FRANCE)
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Power supply ,Dielectric Barrier Discharge ,Energie électrique ,Materials science ,Electric Discharge Power Supply ,Excimer Lamp ,UV emission ,02 engineering and technology ,Dielectric barrier discharge ,01 natural sciences ,7. Clean energy ,010305 fluids & plasmas ,Current Mode ,0103 physical sciences ,0202 electrical engineering, electronic engineering, information engineering ,[PHYS.PHYS]Physics [physics]/Physics [physics] ,business.industry ,Physique ,020208 electrical & electronic engineering ,[SPI.NRJ]Engineering Sciences [physics]/Electric power ,Ultra Violet Generation (UV) ,Current source ,Excimer lamp ,Power (physics) ,Excimer lamps ,Duty cycle ,Optoelectronics ,Square Shape ,DBD ,Electric power ,Current (fluid) ,business - Abstract
A parametric study of a system dedicated to non-coherent UV emission, by means of DBD excilamps, supplied by a controlled square shape current source is proposed. The presentation highlights on the one hand the performances experimentally obtained by combining together a set of 20 different bulbs with different diameters, gap and wall thicknesses (all the bulbs have the same length and are filled with the same Xe-Cl gas mixture), with different electrical power supplying conditions: magnitude, frequency (in the 30 kHz – 200 kHz range) and duty cycle of the square shape current pulses injected into the bulb. The performances concern the average UV power, the efficiency of the bulb conversion (electrical power to UV) and the adjustability of the power. On the second hand, we present design considerations of the power supply which has been especially developed for the purpose of these experiments.
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- 2018
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12. Efficiency of an Exciplex DBD Lamp Excited Under Different Methods
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Dmitry Schitz, Hubert Piquet, Rafael Diez, David Florez, Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Pontificia Universidad Javeriana (COLOMBIA), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Immanuel Kant Baltic Federal University (RUSSIA), Universidad Sergio Arboledad (COLOMBIA), Laboratoire Plasma et Conversion d'Energie - LAPLACE (Toulouse, France), Escuela de Ciencias Exactas e Ingenieria, Universidad Sergio Arboleda (Bogota, Columbia), Groupe ENergie Electrique et SYStémique (LAPLACE-GENESYS), LAboratoire PLasma et Conversion d'Energie (LAPLACE), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, Pontificia Universidad Javeriana (PUJ), Institut National Polytechnique de Toulouse - INPT (FRANCE), and Pontificia Universidad Javeriana Bogota, Colombia
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Dielectric Barrier Discharge ,Nuclear and High Energy Physics ,Materials science ,Electric Discharge Power Supply ,Exciplex lamp ,Excimer Lamp ,Electric generator ,Topology (electrical circuits) ,02 engineering and technology ,Dielectric barrier discharge ,medicine.disease_cause ,Excimer ,7. Clean energy ,01 natural sciences ,010305 fluids & plasmas ,law.invention ,Resonant converter ,[SPI]Engineering Sciences [physics] ,law ,0103 physical sciences ,0202 electrical engineering, electronic engineering, information engineering ,medicine ,ComputingMilieux_MISCELLANEOUS ,Ultraviolet ,Dielectric-barrier discharge (DBD) ,[PHYS.PHYS]Physics [physics]/Physics [physics] ,business.industry ,Physique ,020208 electrical & electronic engineering ,[SPI.NRJ]Engineering Sciences [physics]/Electric power ,[SPI.PLASMA]Engineering Sciences [physics]/Plasmas ,Ultra Violet Generation (UV) ,Converters ,Condensed Matter Physics ,Power (physics) ,Pulsed voltage ,Electromagnetic coil ,Optoelectronics ,DBD ,business - Abstract
International audience; Three different electrical generators have been designed and used to supply an exciplex dielectric barrier discharge lamp in order to elucidate the influence of each one of these supplying strategies over the system performance ; the first method consists on supplying the lamp with short bipolar voltage pulses; the second and third methods are based on semiresonant converters were current pulses, of controlled duration and magnitude, are injected into the lamp. For each one of the generators, measurements of the lamp and supply efficiency, are performed and analyzed, at different levels of power (up to 130 W) and operating frequencies (60–90 kHz). From the experimental results, the pulsed voltage-mode approach has allowed obtaining the highest lamp efficiency (7%), yet the maximum supply efficiency is offered by the resonant mode supplies. On the basis of the lamp and the supply efficiencies, the whole system performance is analyzed.
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- 2018
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13. Evaluation of combinations of essential oils and essential oils with hydrosols on antimicrobial and antioxidant activities
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Hay, Yann-Olivier, Abril-Sierra, Miguel A., Sequeda-Castañeda, Luis G., Bonnafous, Catherine, Raynaud, Christine, Chimie Agro-Industrielle (CAI), Institut National de la Recherche Agronomique (INRA)-Ecole nationale supérieure des ingénieurs en arts chimiques et technologiques-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées, Farmaverde CTA, Pontificia Universidad Javeriana (PUJ), Action Bio, Partenaires INRAE, COLCIENCIAS (Project 120350227391) and the Academic Vice-Rectory and Vice-Rectory for Research of the Pontificia Universidad Javeriana (Project 3743), Farmaverde - CTA (COLOMBIA), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Institut National de la Recherche Agronomique - INRA (FRANCE), Pontificia Universidad Javeriana (COLOMBIA), Chercheur indépendant, Pontificia Universidad Javeriana, Laboratoire de Chimie Agro-Industrielle (LCA), Institut National de la Recherche Agronomique (INRA)-Ecole Nationale Supérieure de Chimie de Toulouse, Institut National Polytechnique de Toulouse - INPT (FRANCE), and ProdInra, Migration
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aceite esencial ,fractional inhibitory indices ,hidrosol ,Fractional inhibitory indices ,[SPI.GPROC] Engineering Sciences [physics]/Chemical and Process Engineering ,lcsh:RM1-950 ,lcsh:RS1-441 ,[CHIM.THER]Chemical Sciences/Medicinal Chemistry ,[SDV.IDA] Life Sciences [q-bio]/Food engineering ,Essential oil ,essential oil ,lcsh:Pharmacy and materia medica ,lcsh:Therapeutics. Pharmacology ,Thymus vulgaris ,hydrosol ,[SDV.IDA]Life Sciences [q-bio]/Food engineering ,Rosmarinus officinalis ,[SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering ,índices inhibición fraccionado ,Biologie végétale ,Hydrosol ,Lippia alba - Abstract
International audience; Context: Essential oils (EO) are commonly extracted from plants by steam distillation in which an aqueous phase called hydrosol (HD) is obtained. Unlike EO, hydrosol studies have been limited despite the interest of the food, cosmetic and phytotherapeutic industries to find natural preservative alternatives to synthetic ones. Aims: To evaluate the in vitro antimicrobial and antioxidant efficacies of combinations of essential oils (EOs) and essential oils and hydrosols (HDs) of Lippia alba, Rosmarinus officinalis, and Thymus vulgaris. Methods: The EOs and HDs were characterized by gas chromatography with flame ionization detector and gas chromatography coupled with mass spectrometry. Then, they were screened against Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus, Candida albicans and Aspergillus niger using the microdilution method for the four first strains and the agar diffusion method for Aspergillus niger. Antioxidant capacity was evaluated using ABTS method. Results: Interactions between essential oils, and essential oils and hydrosols were found to be as microbicide, and for the first time, antioxidant using the fractional inhibitory concentration. When compared with individual EOs, EO-EO combinations diminished the microbicide minimum concentration. Conclusions: The Thymus vulgaris EO-HD combination, in comparison with individual extracts, diminishes by four times the MBC against Escherichia coli and decrease by half their antioxidant capacity.; Contexto: Los aceites esenciales (AEs) se extraen comúnmente de las plantas por destilación con arrastre de vapor en la que se obtiene una faseacuosa llamada hidrosol (HDs). A diferencia de los AE, los estudios de los HD han sido limitados a pesar del interés de las industrias alimentaria,cosmética y fitoterapéutica de encontrar alternativas naturales de conservación.Objetivos: Evaluar la eficacia antimicrobiana y antioxidante in vitro de las combinaciones de AEs, AEs e HDs de Lippia alba, Rosmarinus officinalis y Thymus vulgaris.Métodos: Los AEs e HDs fueron caracterizados por cromatografía de gases con detector de ionización en llama y cromatografía de gases acoplada a espectrometría de masas. Luego se realizaron pruebas de detección contra Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus, Candida albicans y Aspergillus niger utilizando el método de microdilución para las cuatro primeras cepas y el método de difusión en agar para Aspergillus niger. La actividad antioxidante se evaluó utilizando el método ABTS.Resultados: Se encontró que las interacciones entre los aceites esenciales, aceites esenciales e hidrosoles eran microbicidas y, por primera vez,antioxidantes usando la concentración inhibidora fraccionada. Cuando se compararon con AEs individuales, las combinaciones AE-AEdisminuyeron la concentración microbicida mínima.Conclusiones La combinación de tomillo AE-HD; en comparación con los extractos individuales, disminuye en cuatro veces el MBC contraEscherichia coli y disminuye a la mitad su actividad antioxidante.
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- 2018
14. DCM-Operated Series-Resonant Inverter for the Supply of DBD Excimer Lamps
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Hubert Piquet, David Florez, Rafael Diez, Pontificia Universidad Javeriana (PUJ), Groupe ENergie Electrique et SYStémique (LAPLACE-GENESYS), LAboratoire PLasma et Conversion d'Energie (LAPLACE), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - INPT (FRANCE), Pontificia Universidad Javeriana (COLOMBIA), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Laboratoire Plasma et Conversion d'Energie - LAPLACE (Toulouse, France), and Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
- Subjects
Dielectric Barrier Discharge ,Energie électrique ,Electric Discharge Power Supply ,Topology (electrical circuits) ,Plasma sources ,02 engineering and technology ,Dielectric barrier discharge ,7. Clean energy ,01 natural sciences ,Industrial and Manufacturing Engineering ,010305 fluids & plasmas ,law.invention ,Resonant inverter ,Gas discharge devices ,law ,0103 physical sciences ,0202 electrical engineering, electronic engineering, information engineering ,Electronic engineering ,Commutation ,Electrical and Electronic Engineering ,Dielectric barrier discharge (DBD) ,Gas-discharge lamp ,Chemistry ,Ultraviolet (UV) sources ,Zero-current switching (ZCS) ,[SPI.NRJ]Engineering Sciences [physics]/Electric power ,020208 electrical & electronic engineering ,Ultra Violet Generation (UV) ,Excimer lamp ,Power (physics) ,Control and Systems Engineering ,Inverter ,DBD - Abstract
International audience; This paper presents the study of a series-resonant inverter for the supply of a dielectric barrier discharge excimer lamp. Causal analysis, based on the fundamental properties of the load, is used to detail the reasoning which has led to this topology. In order to effectively control the lamp power, the operating mode of this converter combines discontinuous current mode and soft commutation (zero-current switching), obtaining low electromagnetic emissions and reduced switching losses as well. The model of the lamp is briefly presented, and it allows a simple state plane analysis to calculate all the electric variables involved in the converter and, consequently, to select the components of the supply. The mathematical relationships obtained from this process, for injected power control by means of the available degrees of freedom, are validated with simulations and experimental results.
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- 2014
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15. Optimizing the Operation of DBD Excilamps
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David Florez, Rafael Diez, Hubert Piquet, Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - INPT (FRANCE), Pontificia Universidad Javeriana (COLOMBIA), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Universidad Sergio Arboledad (COLOMBIA), Laboratoire Plasma et Conversion d'Energie - LAPLACE (Toulouse, France), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Groupe ENergie Electrique et SYStémique (LAPLACE-GENESYS), LAboratoire PLasma et Conversion d'Energie (LAPLACE), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, and Pontificia Universidad Javeriana (PUJ)
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Optimization ,Dielectric Barrier Discharge ,Nuclear and High Energy Physics ,Energie électrique ,Materials science ,Nuclear engineering ,Excimer Lamp ,Electric generator ,02 engineering and technology ,Dielectric barrier discharge ,Inductor ,medicine.disease_cause ,01 natural sciences ,7. Clean energy ,010305 fluids & plasmas ,law.invention ,law ,0103 physical sciences ,0202 electrical engineering, electronic engineering, information engineering ,medicine ,Operating point ,Dielectric barrier discharge (DBD) ,business.industry ,020208 electrical & electronic engineering ,[SPI.NRJ]Engineering Sciences [physics]/Electric power ,Ultra Violet Generation (UV) ,Condensed Matter Physics ,Excimer lamp ,Ultraviolet (UV) ,Power (physics) ,Duty cycle ,Optoelectronics ,DBD ,Current control ,business ,Ultraviolet - Abstract
International audience; Dielectric barrier discharge (DBD) excimer lamps are efficient and environmentally friendly sources of ultraviolet (UV). One of the challenges for this technology to be massively adopted is the optimization and effective management of the overall lamp-supply system. Accordingly, a methodology to study the impact of the operating point over the performance and operation of a DBD UV excilamp is developed and experimentally validated. The DBD operating point is parametrically adjusted by means of the power supply current with three independent variables: intensity, frequency,and duty cycle. This methodology allows the determination of the optimal operating point for the particular excilamp under study. These supplying conditions will be later achieved by means of a dedicated electrical generator, which has to be especially designed according to these specifications. It is found that an increment in the current intensity has a positive impact on the lamp efficiency and also leads to the existence of more filamentary discharges. Also, a relation between the energy of the pulse supplied to the DBD and the reactor efficiency can be established. For certain levels of UV power, energy savings on the reactor higher than 50% are attained by proper selection of the operating point.
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- 2016
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16. Current-Mode Approach in Power Supplies for DBD Excilamps: Review of 4 Topologies
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David Florez, Xavier Bonnin, Hubert Piquet, Rafael Diez, Pontificia Universidad Javeriana (PUJ), Groupe ENergie Electrique et SYStémique (LAPLACE-GENESYS), LAboratoire PLasma et Conversion d'Energie (LAPLACE), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Pontificia Universidad Javeriana (COLOMBIA), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Universidad Sergio Arboledad (COLOMBIA), Laboratoire Plasma et Conversion d'Energie - LAPLACE (Toulouse, France), and Institut National Polytechnique de Toulouse - INPT (FRANCE)
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Dielectric Barrier Discharge ,Energie électrique ,Nuclear and High Energy Physics ,Electric efficiency ,Electric Discharge Power Supply ,Computer science ,Ultraviolet (UV) generation ,Dielectric barrier discharge ,Network topology ,7. Clean energy ,Capacitance ,law.invention ,law ,Transformer ,Dielectric barrier discharge (DBD) ,Current mode ,business.industry ,[SPI.NRJ]Engineering Sciences [physics]/Electric power ,Electrical engineering ,Ultra Violet Generation (UV) ,Condensed Matter Physics ,Power conversion ,Inductance ,DBD ,Current control ,business ,Luminous efficacy - Abstract
International audience; This document reviews the current-mode supply approach for dielectric barrier discharge (DBD) excilamps. It briefly demonstrates why this mode assures the control of the power injected into the DBD. Considerations with the step-up transformer required for the correct operation of the current-mode are developed. This document shows and compares four different converter topologies that comply with this principle. This comparison is made in terms of electric efficiency and luminous efficacy using experimental measurements.
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- 2015
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17. Impact of the transformer in the current mode supply of dielectric barrier discharge excimer lamps
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Hubert Piquet, Xavier Bonnin, Rafael Diez, David Florez, Pontificia Universidad Javeriana (PUJ), Groupe ENergie Electrique et SYStémique (LAPLACE-GENESYS), LAboratoire PLasma et Conversion d'Energie (LAPLACE), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, Pistre, Karine, Pontificia Universidad Javeriana (COLOMBIA), Groupe ENergie Electrique et SYStémique (GENESYS), and Pontificia Universidad Javeriana Bogota, Colombia
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Dielectric Barrier Discharge ,Isolation transformer ,Engineering ,Excimer Lamp ,Flyback transformer ,Mechanical engineering ,02 engineering and technology ,Distribution transformer ,01 natural sciences ,OSDP ,010305 fluids & plasmas ,Current Mode ,[SPI]Engineering Sciences [physics] ,0103 physical sciences ,High Voltage ,0202 electrical engineering, electronic engineering, information engineering ,Energy efficient transformer ,Delta-wye transformer ,Transformer effect ,ComputingMilieux_MISCELLANEOUS ,Transformer ,business.industry ,020208 electrical & electronic engineering ,[SPI.NRJ]Engineering Sciences [physics]/Electric power ,[SPI.PLASMA]Engineering Sciences [physics]/Plasmas ,Electrical engineering ,Current transformer ,[SPI.TRON]Engineering Sciences [physics]/Electronics ,Parasitic Capacitance ,DBD ,business ,Transformer types ,[SPI.NRJ] Engineering Sciences [physics]/Electric power - Abstract
This paper presents an analysis of the consequences of using a step-up transformer in the supply of a dielectric barrier discharge (DBD) excimer lamp. A simplified transformer model is used to analyze the effects of the different parasitic elements in the operation of a current mode power supply. Mathematical expressions are found for each element and experimental validation is performed. The design of the transformer is developed on the basis of the lamp specifications and two transformer configurations are tested experimentally, analyzing the effect of the parasitic elements and evidencing the influence of grounding a lamp terminal.
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- 2013
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18. Designing the high voltage transformer of power supplies for DBD: Windings arrangment to reduce the parasitic capacitive effects
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Xavier Bonnin, Hubert Piquet, David Florez, Rafael Diez, Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Pontificia Universidad Javeriana (COLOMBIA), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Groupe ENergie Electrique et SYStémique (LAPLACE-GENESYS), LAboratoire PLasma et Conversion d'Energie (LAPLACE), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, Departamento de Electrónica, Pontificia Universidad Javeriana, Pontificia Universidad Javeriana (PUJ), and Institut National Polytechnique de Toulouse - INPT (FRANCE)
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Dielectric Barrier Discharge ,Engineering ,Isolation transformer ,Energie électrique ,Electric Discharge Power Supply ,Parasitic capacitance ,Capacitive sensing ,Flyback transformer ,02 engineering and technology ,Dielectric barrier discharge ,Distribution transformer ,01 natural sciences ,010305 fluids & plasmas ,0103 physical sciences ,High Voltage ,0202 electrical engineering, electronic engineering, information engineering ,Electronic engineering ,Energy efficient transformer ,Delta-wye transformer ,Winding arrangement ,High voltage transformer ,Transformer ,business.industry ,020208 electrical & electronic engineering ,[SPI.NRJ]Engineering Sciences [physics]/Electric power ,Electrical engineering ,Current transformer ,Parasitic Capacitance ,DBD ,business ,Transformer types - Abstract
International audience; In Dielectric Barrier Discharges (DBDs), the control of the power transfer, from the low-voltage static converter to the high voltage DBD, is strongly affected by the parasitic capacitive effects of the step-up transformer. Minimizing these capacitances is of major importance and this paper aims to establish and validate analytical expressions in order to predict the values of the parasitic capacitances of high ratio, step-up transformers, according to different windings arrangements using cylindrical conductors. Afterward, experimental validations are performed on three transformers which have been realized according to same specifications, in order to show the accuracy of the method and to understand the influence the winding arrangements on the capacitive parasitic effects.
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- 2013
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19. Parameters Identification and Gas Behavior Characterization of DBD Systems
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Diego Patino, Xavier Bonnin, Rafael Diez, Hubert Piquet, Andres Lopez, Pontificia Universidad Javeriana (PUJ), Groupe ENergie Electrique et SYStémique (LAPLACE-GENESYS), LAboratoire PLasma et Conversion d'Energie (LAPLACE), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Pontificia Universidad Javeriana (COLOMBIA), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Laboratoire Plasma et Conversion d'Energie - LAPLACE (Toulouse, France), and Institut National Polytechnique de Toulouse - INPT (FRANCE)
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Dielectric Barrier Discharge ,0209 industrial biotechnology ,Nuclear and High Energy Physics ,Polynomial ,Energie électrique ,Materials science ,Electric Discharge Power Supply ,Parameter identification ,Differential equation ,Gas conductance ,02 engineering and technology ,Dielectric barrier discharge ,Dielectric ,01 natural sciences ,Capacitance ,010305 fluids & plasmas ,020901 industrial engineering & automation ,0103 physical sciences ,Breakdown voltage ,Gray box ,Electronic circuit ,Dielectric barrier discharge (DBD) ,business.industry ,Estimation theory ,[SPI.NRJ]Engineering Sciences [physics]/Electric power ,Electrical engineering ,Modeling ,Mechanics ,Condensed Matter Physics ,DBD ,business - Abstract
International audience; This paper proposes an efficient modeling and an identification method for dielectric barrier discharge (DBD) systems, based on input–output (current–voltage) experimental measurements. The DBD is modeled using an equivalent electric circuit associated with a differential equation that describes the dynamics of its conductance. This equation assumes a homogeneous behavior of the gas. This paper introduces a series of polynomial terms of the current of the gas into the conductance equation. These terms, after identification, are a very useful tool to analyze the physical mechanisms that take place in the gas. The identification process also returns the numerical values of other DBD parameters, such as associated capacitances and the breakdown voltage. In addition, an asymmetric model for the gas, which considers the direction of the current, is proposed to consider the possible geometrical dissimilarity between the two electrodes of the DBD setup. Experimental measurements taken on two different DBD applications are used for validating the proposed approach.
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- 2013
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20. Synthesized High-Frequency Thyristor for Dielectric Barrier Discharge Excimer Lamps
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Marc Cousineau, Rafael Diez, Hubert Piquet, O. Durrieu, Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Pontificia Universidad Javeriana (COLOMBIA), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Convertisseurs Statiques (LAPLACE-CS), LAboratoire PLasma et Conversion d'Energie (LAPLACE), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, Pontificia Universidad Javeriana (PUJ), Groupe ENergie Electrique et SYStémique (LAPLACE-GENESYS), and Institut National Polytechnique de Toulouse - INPT (FRANCE)
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Dielectric Barrier Discharge ,Energie électrique ,Electric Discharge Power Supply ,Materials science ,Excimer Lamp ,02 engineering and technology ,Dielectric barrier discharge ,Thyristor ,7. Clean energy ,01 natural sciences ,Switched mode power supplies ,law.invention ,Charge transfer ,law ,0103 physical sciences ,0202 electrical engineering, electronic engineering, information engineering ,Electrical and Electronic Engineering ,Power MOSFET ,Excimer UV lamps ,010302 applied physics ,Dielectric barrier discharge (DBD) ,Gas-discharge lamp ,business.industry ,[SPI.NRJ]Engineering Sciences [physics]/Electric power ,020208 electrical & electronic engineering ,Electrical engineering ,Ultra Violet Generation (UV) ,Current source ,Excimer lamp ,Control and Systems Engineering ,Logic gate ,Semiconductor switches ,Optoelectronics ,DBD ,business ,Voltage - Abstract
International audience; Dielectric barrier discharge (DBD) lamps, being capacitive loads, must be associated with bidirectional current sources for an appropriate control of the transferred power. Pulsed current source supplies, which are known to offer very interesting performances, require specific power switches that are able to manage bidirectional voltage and unidirectional current at much higher frequencies (several hundreds of kilohertz) than commercial thyristors. This paper proposes the detailed design of such a high-speed synthesized thyristor, using discrete components: a MOSFET in series with a high-voltage (HV) diode and a logic circuit that controls its gate. This switch is associated with an optimized self-powered driver, which is a very efficient solution to handle the perturbations associated with the HV and high-frequency operation. Experimental application of this device for DBD excimer lamp supply is proposed.
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- 2012
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21. Current-Mode Power Converter for Radiation Control in DBD Excimer Lamps
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Rafael Diez, Marc Cousineau, Hubert Piquet, Sounil Bhosle, Pontificia Universidad Javeriana (PUJ), Groupe ENergie Electrique et SYStémique (LAPLACE-GENESYS), LAboratoire PLasma et Conversion d'Energie (LAPLACE), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, Convertisseurs Statiques (LAPLACE-CS), LED Engineering Development, Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Led Engineering Development - LED (FRANCE), Pontificia Universidad Javeriana (COLOMBIA), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Laboratoire Plasma et Conversion d'Energie - LAPLACE (Toulouse, France), and Institut National Polytechnique de Toulouse - INPT (FRANCE)
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Dielectric Barrier Discharge ,Energie électrique ,Materials science ,Electric Discharge Power Supply ,Ultraviolet generation ,Excimer Lamp ,02 engineering and technology ,Dielectric barrier discharge ,medicine.disease_cause ,01 natural sciences ,7. Clean energy ,Capacitance ,010305 fluids & plasmas ,law.invention ,Current Mode ,law ,0103 physical sciences ,0202 electrical engineering, electronic engineering, information engineering ,medicine ,Electrical and Electronic Engineering ,Dielectric barrier discharge (DBD) ,Gas-discharge lamp ,business.industry ,020208 electrical & electronic engineering ,[SPI.NRJ]Engineering Sciences [physics]/Electric power ,Converters ,Excimer lamp ,Power conversion ,Power (physics) ,Inductance ,Control and Systems Engineering ,Optoelectronics ,Ultra Violet generation (UV) ,DBD ,Current control ,business ,Ultraviolet - Abstract
International audience; A pulsed current-mode converter specifically designed for the supply of dielectric barrier discharge excimer lamps is proposed in this paper. The power supply structure is defined on the basis of causality criteria that are justified by the structure of the lamp model. The converter operation is studied, and its design criteria are established using state-plane analysis. This converter, operating in discontinuous conduction mode, controls directly both the amplitude and the duration of the emitted ultraviolet (UV) pulses. Experimentally, the UV radiation is demonstrated to be proportional to the current injected into the gas, and the degrees of freedom offered by the control of the supply are shown to be very efficient for the active control of the UV power.
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- 2012
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22. Chapter 17. Stereovision Algorithm to be Executed at 100Hz on a FPGA-Based Architecture
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Devy, Michel, Boizard, Jean-Louis, Botero Galeano, Diego, Carrillo Lindado, Henry, Ibarra Manzano, Mario, Irki, Zohir, Naoulou, Abdelelah, Lacroix, Pierre, Fillatreau, Philippe, Fourniols, Jean-Yves, Parra, Carlos, Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Institut National des Sciences Appliquées de Toulouse - INSA (FRANCE), Pontificia Universidad Javeriana (COLOMBIA), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Delta Technologies Sud-Ouest (FRANCE), Bhatti, Asim, and Institut National Polytechnique de Toulouse - INPT (FRANCE)
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Algorithme et structure de données ,Sterovision ,Mobile robots ,Réseaux et télécommunications ,Automatique / Robotique ,100Hz ,FPGA ,Intelligent Transportation Systems - Abstract
This chapter describes the development of an integrated stereovision sensor intended to be embedded on mobile platforms like robots or intelligent vehicles. Such a sensor is required for the motion control of these platforms. Navigation can be either autonomous (e.g. for a robot executing tasks in dangerous environments), or supervised by a human driver (typically for intelligent transportation systems).
- Published
- 2011
23. Programmable current converter synthesis for the evaluation of UV radiation of excimer lamps
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Florez, David, Diez, Rafael, Hay, Abdel Karim, Perilla, Gabriel, Ruiz, Fredy, Piquet, Hubert, Pontificia Universidad Javeriana (PUJ), Groupe ENergie Electrique et SYStémique (LAPLACE-GENESYS), LAboratoire PLasma et Conversion d'Energie (LAPLACE), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Pontificia Universidad Javeriana (COLOMBIA), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Laboratoire Plasma et Conversion d'Energie - LAPLACE (Toulouse, France), and Institut National Polytechnique de Toulouse - INPT (FRANCE)
- Subjects
Dielectric Barrier Discharge ,Materials science ,Electric Discharge Power Supply ,Capacitive sensing ,Excimer Lamp ,Current-mode ,02 engineering and technology ,Dielectric barrier discharge ,Radiation ,01 natural sciences ,7. Clean energy ,Static converter ,law.invention ,Current Mode ,Excimer ,law ,0103 physical sciences ,0202 electrical engineering, electronic engineering, information engineering ,Electronique ,010302 applied physics ,Gas-discharge lamp ,business.industry ,020208 electrical & electronic engineering ,[SPI.PLASMA]Engineering Sciences [physics]/Plasmas ,Ultra Violet Generation (UV) ,Converters ,Excimer lamp ,Power (physics) ,[SPI.TRON]Engineering Sciences [physics]/Electronics ,Inductance ,Plasmas ,Optoelectronics ,DBD ,business - Abstract
This work proposes the development of a power supply for Dielectric Barrier Discharge (DBD) lamps, intended for the evaluation of a water treatment system based on UV radiation. The DBD excimer lamp is an attractive source of UV because of its cost and radiation power. The proposed converter is conceived to control the UV radiation by programming different lamp current intensities, duty cycles and frequencies. For the converter synthesis, a capacitive electric equivalent model of the DBD is used. A simulation of the converter and its control analysis is presented.
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- 2010
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24. Pulsed Current-Mode Supply of Dielectric Barrier Discharge Excilamps for the Control of the Radiated Ultraviolet Power
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Michael V Erofeev, Rafael Diez, Hubert Piquet, Sounil Bhosle, Groupe ENergie Electrique et SYStémique (LAPLACE-GENESYS), LAboratoire PLasma et Conversion d'Energie (LAPLACE), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, Pontificia Universidad Javeriana (PUJ), Siberian Branch of the Russian Academy of Sciences (SB RAS), Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Pontificia Universidad Javeriana (COLOMBIA), Siberian Branch of the Russian Academy of Sciences - SB RAS (RUSSIA), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), and Institut National Polytechnique de Toulouse - INPT (FRANCE)
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Dielectric Barrier Discharge ,Nuclear and High Energy Physics ,Energie électrique ,Materials science ,Electric Discharge Power Supply ,Excimer Lamp ,Topology (electrical circuits) ,UV emission control ,Dielectric barrier discharge ,Effective radiated power ,medicine.disease_cause ,01 natural sciences ,7. Clean energy ,010305 fluids & plasmas ,law.invention ,Current Mode ,Narrowband ,law ,0103 physical sciences ,medicine ,Excilamps ,010302 applied physics ,Dielectric barrier discharge (DBD) ,Gas-discharge lamp ,business.industry ,[SPI.NRJ]Engineering Sciences [physics]/Electric power ,Electrical engineering ,Ultra Violet Generation (UV) ,Condensed Matter Physics ,Pulsed current-mode supply ,Power (physics) ,Optoelectronics ,DBD ,business ,Ultraviolet ,Power control - Abstract
International audience; UV excimer lamps are efficient narrowband sources of UV radiation with applications in various domains. The issue of controlling the UV emission by means of the power supply associated with such lamps favors pulsed current-controlled generators. After having established the previous statements, we propose a dedicated power converter topology which implements the needed performances. The analysis of the degrees of freedom of this structure shows the capability of this pulsed supply to realize the control of both the pulses’ current energy and of the mean power transferred to the lamp. Actual experimental realizations and measurement are presented and the feasibility and the performances of the proposed solutions are established.
- Published
- 2010
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25. Phytochemical, antioxidant and antimicrobial parameters of essential oils and hydrosols of colombian Thyme and Rosemary obtained using two different steam distillation methods
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Christine Raynaud, Catherine Bonnafous, Yann-Olivier Marie Hay, Luis G. Sequeda C, Miguel Antonio Abril Sierra, Mayra Tellez, Alba N. Tellez A, Action Bio (FRANCE), Farmaverde - CTA (COLOMBIA), Institut National Polytechnique de Toulouse - INPT (FRANCE), Institut National de la Recherche Agronomique - INRA (FRANCE), Pontificia Universidad Javeriana (COLOMBIA), Laboratoire de Chimie Agro-Industrielle - LCA (Toulouse, France), and Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
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ABTS ,biology ,Biochimie, Biologie Moléculaire ,Thymus vulgaris ,biology.organism_classification ,complex mixtures ,Essential oil ,Rosmarinus ,law.invention ,Steam distillation ,chemistry.chemical_compound ,chemistry ,Phytochemical ,law ,Officinalis ,Rosmarinus officinalis ,Organic chemistry ,Antimicrobial ,Food science ,Antioxidant ,Thymol ,Distillation ,Sciences agricoles ,Hydrosol - Abstract
Two procedures of steam distillation of Rosmarinus officinalis and Thymus vulgaris were compared by phytochemical, antioxidant and antimicrobial analysis of their respective essential oils and hydrosols using respectively GCFID and GCMS analysis, free radical scavenging activity on ABTS and dilution and diffusion method against 3 bacteria and 2 fungi. Differences in bioactivity results are discussed taking into account changes in molecular content of essential oils and hydrosols obtained by the two different distillation methods. Although no significant difference was observed between the two procedures with Rosmarinus officinalis, that was not the case with Thymus vulgaris. Significant differences were noted, not only in their respective chemical composition especially with the thymol and p-cymene percentage with respectively a change from 39% with conventional steam distillation to 27% with adapted steam distillation for thymol and from 28% with the first distillation to 37% with the second one for p-cymene. These phytochemical composition changes have an impact on their biological activities results and consequently on the therapeutic activities expected which shows the importance of distillation method selection.
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- 2015
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26. Evaluation of decision-support tools for coastal flood and erosion control: A multicriteria perspective.
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Enríquez-Hidalgo AM, Vargas-Luna A, and Torres A
- Abstract
Coastal areas face significant challenges due to natural and anthropogenic changes, such as sea level rise, extreme events and coastal erosion. The coastal management requires the consideration of socioeconomic and environmental factors to address these variables. The selection of an appropriate Decision Support Tool (DST) based on decision matrix method plays a crucial role in implementing coastal management strategies to tackle climate change-related issues. This has posed considerable challenges for decision-makers, aligning with the Sustainable Development Goals (SDG). This review provides an overview of the practical experience in the application of DSTs for coastal erosion and flood risk, emphasizing the use of Multi-Criteria Decision Analysis (MCDA). DST choice depends on the coastal archetype, including its geographical features and sociocultural context. The purpose is to clarify how the integration of DSTs maximizes flexibility and supports the implementation of future Decision Support System (DSS) tailored to the needs of coastal cities with development pathways (DP). This review assesses different MCDA methods, highlighting their applicability, utility, and integration in coastal management, while evaluating each method's strengths, weaknesses, and specific applications, with a focus on sustainability and resilience. The review highlights the necessity of expert knowledge in accurately defining criteria and weighting factors to ensure that the chosen MCDA method reflects the complexities of the coastal environment. Depending on the scenario, methods like PROMETHEE and ELECTRE are recommended for their flexibility and robustness in handling complex decision-making processes, especially in data-rich and well-structured environments. In contrast, TOPSIS and AHP are suitable for scenarios with limited information or requiring minimal interaction with decision-makers. For more challenging contexts, where computational resources and expertise are constrained, methods like MAUT, VIKOR, and TODAIM emerge as viable alternatives due to their adaptability and reduced reliance on extensive datasets., Competing Interests: Declaration of competing interest The authors declare the following financial interests/personal relationships which may be considered as potential competing interests:Andres M Enriquez reports a relationship with Fundación WWB para la investigación that includes: funding grants. If there are other authors, they declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2025 Elsevier Ltd. All rights reserved.)
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- 2025
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27. Neurological Manifestations of Aortic Dissection: A Scoping Review.
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Varela-Jaramillo S, Taub-Krivoy A, Gómez-Gutiérrez MA, Lacouture-Silgado I, Acevedo-González JC, Correa JR, and Ríos EG
- Abstract
Aortic dissection (AD) is the most prevalent aortic pathology, with an incidence of 2.6-3.5 cases per 100,000 inhabitants per year with mortality rates as high as 90% at 3 months without proper management. Despite the presence of typical symptoms, it has been reported that up to 38% of cases go unnoticed in the initial evaluation, either due to additional symptomatology or the absence of classic symptoms. In 28% of cases the diagnosis is made post-mortem, highlighting the severity and importance of timely diagnosis. The main goals of this study were to identify the primary neurological manifestations of acute AD and the frequency of these manifestations in type A and B AD according to the Stanford classification. A total of 2,734 records were retrieved from two databases, of which 2,611 were excluded. Therefore, 123 articles were obtained and 88 were evaluated for eligibility. Consequently, 79 articles were included in the review. The abstracts identified in the search were screened by seven blinded independent authors and excluded those who lacked relevance. The authors read the full texts independently to determine inclusion. A third reviewer adjudicated discrepancies when opinions were at odds. There were 169 patients diagnosed with Stanford type A, of which 43.8% displayed quantitative impairment of consciousness. Within this group, transient loss of consciousness was observed in 34.3% of cases. Motor syndrome was present in 54.5%, with 23.7% of patients presenting with hemiparesis or hemiplegia. 3.6% had facial paresis or paralysis and less frequently monoparesis, paraparesis, hyperreflexia, spasticity, and muscle spasms. 7.6% presented with language impairments including Broca's aphasia and dysarthria. Seizures were present in 3.6%. Neuro-ophthalmological symptoms were 2.9%, cortical or cognitive symptoms and headache were 2.3%, cerebellar syndrome was 1.8%, and sensory syndrome was 1.2%. Of 86 patients diagnosed with Stanford type B, 57.0% displayed motor syndrome, with 50.0% being paraparesis or paraplegia, 4.7% monoplegia, and 2.3% hemiplegia or hemiparesis. Additionally, impairment of consciousness was present in 26.7%, sensory syndrome in 12.8%, and language impairments in 3.5%. In the emergency department, understanding the neurological manifestations in both Stanford type A and B dissections emerges as a pivotal cornerstone for conducting precise assessments and efficient patient management. Given the wide spectrum of manifestations, we emphasize the importance of suspecting AD when neurological disorders are associated with the classic symptoms. In these cases, we encourage a complete neurological examination to be performed and a multidisciplinary group assembled to tackle this entity.
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- 2024
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28. Time in range and mean glucose cut-off points for reduction of fetal outcomes in pregnant women with type 1 diabetes using automated insulin delivery systems.
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Medina AMG, Carrillo DCH, Macías MNS, Chávez MJS, Gómez MAR, Parra D, González JAG, Grassi B, Imitola A, Cob A, Rondón M, García M, and Velandia OMM
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- Humans, Pregnancy, Female, Adult, Prospective Studies, Pregnancy in Diabetics drug therapy, Pregnancy in Diabetics blood, Pregnancy Outcome, Hypoglycemic Agents administration & dosage, Hypoglycemic Agents therapeutic use, Fetal Macrosomia, Blood Glucose Self-Monitoring methods, Diabetes Mellitus, Type 1 drug therapy, Diabetes Mellitus, Type 1 blood, Blood Glucose analysis, Blood Glucose metabolism, Insulin Infusion Systems, Insulin administration & dosage, Insulin therapeutic use
- Abstract
Aim: In pregnant women with Type 1 Diabetes (T1D), achieving a lower recommended time in range (TIRp,63-140 mg/dl) could have an impact on fetal outcomes. To determine the TIRp and mean glucose cut-off point associated with better fetal outcomes in pregnant women using automated insulin delivery (AID) systems., Methods: A prospective cohort of pregnant women with T1D, using AID systems and followed-up in Latin America was analyzed. Optimal TIRp and mean glucose cut-off points for predicting large for gestational age (LGA) were determined using the Liu method. Fetal outcomes were evaluated for the identified cut-off point and the one recommended by guidelines (TIRp > 70 %)., Results: Sixty-two patients were included (mean age 31.9 ± 5.9 years, HbA1c 7.57 %±1.29 %, TIRp 59.8 %±14.6 %). 27.5 % on advanced hybrid closed loop systems (AHCL). LGA (50 vs 17.9 %,p = 0.010) and hyperbilirubinemia (45 % vs 11.8 %,p = 0.016) were more common in patients with TIRp < 59.1 %. Optimal cut-off of TIRp in the second trimester for predicting LGA was < 59.1 % (sensitivity 75 %, specificity 61 %) with an AUC of 0.68(CI 0.48-0.88). Optimal cut-off for mean glucose was 133 mg/dL (sensitivity 69 %, specificity 70 %) with an AUC of 0.70(CI 0.51-0.88) in the same trimester. Better metabolic control during the third trimester was seen in the AHCL users compared to other devices., Conclusions: TIRp > 59.1 % and mean glucose < 133 mg/dl in the second trimester, is associated with lower fetal outcomes of large for gestational age. One of the strategies that would improve TIRp is the early use of AHCL systems. Further studies are needed before a strong recommendation can be made., Competing Interests: Declaration of competing interest The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: [Ana María Gómez received speaker’s fees from Novo Nordisk, Elli Lilly, Boehringer Ingelheim, Abbott, and Medtronic. Diana Henao received speaker’s fees from Novo Nordisk, Sanofi and Abbott. Bruno Grassi received speaker’s fees from Novo Nordisk, Sanofi, and Medtronic. Alejandro Cob received speaker’s fees from Abbott and Astra Zeneca]., (Copyright © 2024 The Author(s). Published by Elsevier B.V. All rights reserved.)
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- 2024
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29. Policy as normative influence? On the relationship between parental leave policy and social norms in gender division of childcare across 48 countries.
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Schindler S, Schuster C, Olsson MIT, Froehlich L, Hübner AK, Block K, Van Laar C, Schmader T, Meeussen L, van Grootel S, Croft A, Sun MS, Ainsaar M, Aarntzen L, Adamus M, Anderson J, Atkinson C, Avicenna M, Bąbel P, Barth M, Benson-Greenwald T, Maloku E, Berent J, Bergsieker HB, Biernat M, Birneanu A, Bodinaku B, Bosak J, Bosson J, Branković M, Burkauskas J, Čavojová V, Cheryan S, Choi E, Choi I, Contreras-Ibáñez CC, Coogan A, Danyliuk I, Dar-Nimrod I, Dasgupta N, de Lemus S, Devos T, Diab M, Diekman AB, Efremova M, Eisner L, Eller A, Erentaite R, Fedáková D, Franc R, Gartzia L, Gavreliuc A, Gavreliuc D, Gecaite-Stonciene J, Germano AL, Giovannelli I, Gismondi Diaz R, Gitikhmayeva L, Gizaw AM, Gjoneska B, González OM, González R, Grijalva ID, Güngör D, Gustafsson Sendén M, Hall W, Harb C, Hassan B, Hässler T, Hawi DR, Henningsen L, Hoppe A, Ishii K, Jakšić I, Jasini A, Jurkevičienė J, Kelmendi K, Kirby TA, Kitakaji Y, Kosakowska-Berezecka N, Kozytska I, Kulich C, Kundtová-Klocová E, Kunuroglu F, Aidy CL, Lee A, Lindqvist A, López-López W, Luzvinda L, Maricchiolo F, Martinot D, McNamara RA, Meister A, Melka TL, Mickuviene N, Miranda-Orrego MI, Mkamwa T, Morandini J, Morton T, Mrisho D, Nikitin J, Otten S, Pacilli MG, Page-Gould E, Perandrés-Gómez A, Pizarro J, Pop-Jordanova N, Pyrkosz-Pacyna J, Quta S, Ramis T, Rani N, Redersdorff S, Régner I, Renström EA, Rivera-Rodriguez A, Esmeralda RT, Ryabichenko T, Saab R, Sakata K, Samekin A, Sánchez-Pacheco T, Scheifele C, Schulmeyer MK, Sczesny S, Sirlopú D, Smith-Castro V, Soo K, Spaccatini F, Steele JR, Steffens MC, Sucic I, Vandello J, Velásquez-Díaz LM, Vink M, Vives E, Warkineh TZ, Žeželj I, Zhang X, Zhao X, Koc Y, Kocak ÖE, and Martiny SE
- Abstract
In the present work, we addressed the relationship between parental leave policies and social norms. Using a pre-registered, cross-national approach, we examined the relationship between parental leave policies and the perception of social norms for the gender division of childcare. In this study, 19,259 students (11,924 women) from 48 countries indicated the degree to which they believe childcare is (descriptive norm) and should be (prescriptive norm) equally divided among mothers and fathers. Policies were primarily operationalized as the existence of parental leave options in the respective country. The descriptive and prescriptive norms of equal division of childcare were stronger when parental leave was available in a country - also when controlling for potential confounding variables. Moreover, analyses of time since policy change suggested that policy change may initially affect prescriptive norms and then descriptive norms at a later point. However, due to the cross-sectional nature of the data, drawing causal inferences is difficult., (© 2024 British Psychological Society.)
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- 2024
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30. IL-8 in bone marrow and peripheral blood of patients with B-cell acute lymphoblastic leukemia is associated with high regulatory T cell counts, degree of tumor infiltration and expression of CXCR1 in blasts.
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Anaya D, Santander González SP, Murillo N, Ballesteros-Ramírez R, Reyes IL, Herrera MV, Solano J, Fiorentino S, and Quijano S
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Introduction: Regulatory T cells (Treg cells) in a tumor environment and the expression of forkhead box P3 (FOXP3) in tumor cells have been associated with a poor prognosis. There are few studies evaluating Treg cells and FOXP3 in B-cell acute lymphoblastic leukemia (B-cell ALL). This study aimed to evaluate the frequencies of Treg cells in bone marrow (BM) and peripheral blood (PB) of patients with B-cell ALL and to determine their associations with the circulating cytokine profile and the expression of CXCR1 (IL-8 receptor) in Treg cells, as well as to compare FOXP3 expression in blasts of patients with B-cell ALL and normal lymphoid precursors., Methods: Samples of BM and PB from patients with B-cell ALL and healthy controls were studied. Treg cells, cytokines, FOXP3 and CXCR1 were evaluated using flow cytometry and analyzed., Results: A total of 20 patients with B-cell ALL and 10 healthy controls were included. In B-cell ALL patients, Treg cell frequencies increased significantly, with higher percentages in the PB. Absolute Treg cell counts were associated with absolute blast counts in the BM and PB and with an IL-8 concentration. The IL-8 and IL-6 levels were associated with the CXCR1 expression in PB Treg cells. In addition, a greater expression of FOXP3 was observed in leukemic blasts than in normal lymphoid precursors., Conclusions: These results suggest that the presence of Treg cells and cytokines in the tumor environment may correspond to mechanisms to evade the immune response. For that reason, it would be important to monitor these parameters in B-cell ALL to establish their effect on the disease prognosis., Competing Interests: Conflicts of interest None., (Copyright © 2023 Associação Brasileira de Hematologia, Hemoterapia e Terapia Celular. Published by Elsevier España, S.L.U. All rights reserved.)
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- 2024
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31. Extreme bradycardia in a case of benzodiazepine intoxication in a "body stuffer" (Bradicardia extrema en un caso de intoxicación por benzodiacepinas en un "body stuffer").
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La Rota J, Nemeguén C, Narváez L, Motta J, and Calderón J
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Transport intoxication in the form of body stuffing, a dangerous practice involving the ingestion or insertion of psychoactive substances into the body to evade detection during drug trafficking, represents a major medical problem that requires immediate attention in the emergency department. Unlike body packing, where substances are encapsulated and swallowed for later extraction, body stuffing involves direct ingestion without wrapping, which greatly increases the risk of serious intoxication and even death. Benzodiazepines, due to their high demand on the black market, are among the most common drugs used in body stuffing. The management of this type of poisoning in the emergency department presents a significant clinical challenge due to the variability in clinical presentation, which can range from drowsiness and confusion to respiratory depression and coma.Rapid and accurate assessment is critical for effective management.The initial focus is on patient stabilization and life support as needed, which may include administration of naloxone to reverse opioid effects, mechanical ventilation for respiratory depression, and management of seizures if they occur.An appropriate approach in the emergency department is crucial to improve the prognosis and quality of life of patients affected by this type of poisoning. Timely intervention and expert management can prevent serious complications and even death. We present the case of a patient with benzodiazepine intoxication with an atypical presentation due to clonazepam transport with bradycardia and its management in an institution in Bogotá-Colombia., Competing Interests: The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (© 2024 The Authors.)
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- 2024
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32. Cognitive predictors and decision-making in the experience of coronary syndrome symptoms.
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Bernal-Cárdenas CY, Céspedes-Cuevas VM, and Rojas-Reyes J
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- Humans, Male, Female, Cross-Sectional Studies, Middle Aged, Cognition, Aged, Self Efficacy, Acute Coronary Syndrome psychology, Decision Making
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Objective: To determine the predictive value of Cognitive Assessment, Symptom Severity, Personal Control and Self-Efficacy on decision making in the experience of Acute Coronary Syndrome symptoms., Method: Quantitative study of cross-sectional analytical design, a probabilistic sampling was carried out for 256 participants diagnosed with coronary syndrome in three health institutions. The effects between the independent variables Cognitive Assessment, Symptom Severity, Personal Control, Self-Efficacy and the dependent Decision-Making were analyzed. Using inferential statistics, a Generalized Linear Regression Model was carried out, which allowed establishing the causal relationships between the variables., Results: Two predictive models were obtained between decision making and cognitive evaluation, in which personal control, severity of symptoms, sex and context were significant. Self-efficacy was not reported as a predictor variable. The values of the independent variables showed a behavior directly proportional to the Decision Making score., Conclusion: A verification of the conceptual model for the management of symptoms was carried out., (Copyright © 2023 Sociedad Española de Enfermería Intensiva y Unidades Coronarias (SEEIUC). Published by Elsevier España S.L.U. All rights reserved.)
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- 2024
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33. Multizonal observational study conducted by clinical practitioners on Repatha® use in patients with hyperlipidemia (ZERBINI): Colombian results.
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Roncancio HM, Lugo-Peña JR, García ÁA, Leal J, Hoyos CA, Beltrán JA, Cruz CL, Paez-Cano C, Pineda-Posada M, and Contreras E
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- Humans, Colombia, Cholesterol, LDL, Antibodies, Monoclonal therapeutic use, Treatment Outcome, Anticholesteremic Agents adverse effects, Hyperlipidemias drug therapy, Diabetes Mellitus, Type 2 complications, Hydroxymethylglutaryl-CoA Reductase Inhibitors adverse effects, Cardiovascular Diseases prevention & control, Cardiovascular Diseases chemically induced, Antibodies, Monoclonal, Humanized
- Abstract
Background: Cardiovascular disease (CVD) represents the primary cause of death and disability globally, with elevated cholesterol as one of the leading risk factors for CVD. We describe the clinical characteristics, treatment patterns, and effectiveness of evolocumab in treating hyperlipidemia., Methods: Observational study conducted through a chart review of patients with hyperlipidemia receiving evolocumab as part of clinical management in Colombia., Results: This study included 115 patients treated with evolocumab. A total of 101 patients (87.8%) had a history of CVD, 13 (11.3%) familial hypercholesterolemia (FH), and 23 (20%) type 2 diabetes. Thirty-nine patients reported intolerance to any statin (33.9%). The median value of LDL-C before initiation of evolocumab was 147mg/dL (IQR: 122.5-183.7mg/dL). Within the first 3 months of treatment, LDL-C value dropped to a median value of 53mg/dL (IQR: 34.0-95.5mg/dL), showing a reduction of 63.9%. The median LDL-C values remained below 45mg/dL until the end of follow-up. Among the patients with available data, up to 61% achieved an LDL-C level below 55mg/dL at the 10-12-month follow-up. A total of 72% of patients were persistent with treatment. Safety results showed a low frequency of hospitalizations (≤2%) and treatment-emergent adverse drug reactions (5.2%). No serious adverse events were reported., Conclusions: Evolocumab was associated with reductions in LDL-C levels, with a relative decrease of 63.9% within the first 3 months of treatment. Low rates of interruptions due to adverse events and adequate medication persistence was reported., (Copyright © 2023 The Authors. Publicado por Elsevier España, S.L.U. All rights reserved.)
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- 2024
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34. Trajectories of motor function in children with Duchenne muscular dystrophy: A longitudinal study on a Colombian population.
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Ortiz-Corredor F, Sandoval-Salcedo A, Castellar-Leones S, Soto-Pena D, Ruíz-Ospina E, and Suarez-Obando F
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- Child, Humans, Longitudinal Studies, Colombia epidemiology, Muscular Dystrophy, Duchenne
- Abstract
Duchenne Muscular Dystrophy (DMD) is characterized by an initial increase in motor function followed by a plateau phase and then entering a phase of steady decline. However, motor evolution of DMD have not been evaluated in developing countries. Therefore, this study aims to evaluate the trajectory of motor function in a sample of Colombian children with DMD. We included 119 children with DMD aged 4.8-19.3 years (mean follow-up = 1.7 years). A linear mixed model was used with age as the time scale and adjusted for covariates using a stepwise regression. Participants showed a progressive decline in motor skills from the age of 5 years with a decrease in speed around the age of 11 years (p < 0.001). After age 11, the decline in motor function was observed to continue until age 20 but at a slower rate (βAge = -9.64. and βAge2 = 0.18, p < 0.001 for both). Educational inclusion, glucocorticoid treatment and the number of mutated exons were shown to be associated with the motor performance. These findings may indicate that the evolution of DMD maintains similar patterns between high income countries and the Colombian population. They allow us to adapt and develop treatments that impact the population with DMD in Colombia, based in international evidence., (© 2023 Published by Elsevier Ltd on behalf of European Paediatric Neurology Society.)
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- 2023
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35. Keratitis in patients with corneal foreign bodies: a cross-sectional study in Cali, Colombia.
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Guarin DA, Bonilla-Escobar FJ, Salamanca O, Moreno GL, and Martínez-Blanco AM
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- Humans, Male, Adult, Cross-Sectional Studies, Colombia epidemiology, Cornea, Keratitis epidemiology, Eye Foreign Bodies complications, Eye Foreign Bodies epidemiology
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Purposes: To describe the clinical characteristics and factors associated with keratitis in patients with corneal foreign bodies in Colombia., Methods: This cross-sectional study was based on a clinical records review of patients who had corneal foreign bodies and were admitted to the emergency department between June 2018 and June 2019 in Cali, Colombia. The primary outcome was the presence of keratitis diagnosed based on clinical criteria. Univariate and multivariate logistic regression models were used to identify associated factors., Results: A total of 381 corneal foreign bodies in 372 patients were analyzed (median age, 40.0; interquartile range, 29.0-53.0 years; male, 94.7% (n=352). Ninety-five patients developed keratitis (24.9%, 95% confidence interval [CI] 20.8%-29.5%). In the multivariate analysis, age 30 years (odds ratio [OR] 2.15, 95% CI 1.06-4.36), finding of aqueous flare (OR 2.81, 95% CI 1.39-5.66]), and a foreign body in the peripheral cornea (OR 2.05, 95% CI 1.19-3.50] were associated with an increased risk for keratitis. Sex, time between injury and admission, and corneal edema were not related to keratitis (p>0.05)., Conclusion: In Cali, Colombia, a high proportion of keratitis was reported in patients with corneal foreign body. Age, an aqueous flare, and a foreign body in the peripheral cornea were the factors associated with keratitis.
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- 2023
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36. STRIDE: Street View-based Environmental Feature Detection and Pedestrian Collision Prediction.
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González C, Ayobi N, Escallón F, Baldovino-Chiquillo L, Wilches-Mogollón M, Pasos D, Ramírez N, Pinzón J, Sarmiento O, Quistberg DA, and Arbeláez P
- Abstract
This paper introduces a novel benchmark to study the impact and relationship of built environment elements on pedestrian collision prediction, intending to enhance environmental awareness in autonomous driving systems to prevent pedestrian injuries actively. We introduce a built environment detection task in large-scale panoramic images and a detection-based pedestrian collision frequency prediction task. We propose a baseline method that incorporates a collision prediction module into a state-of-the-art detection model to tackle both tasks simultaneously. Our experiments demonstrate a significant correlation between object detection of built environment elements and pedestrian collision frequency prediction. Our results are a stepping stone towards understanding the interdependencies between built environment conditions and pedestrian safety.
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- 2023
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37. Risk factors for reamputation in patients with diabetic foot: A case-control study.
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Correa CAS, Vargas-Hernández JS, García LF, Jaimes J, Caicedo M, Niño ME, and Quijano JR
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- Humans, Male, Case-Control Studies, Retrospective Studies, Constriction, Pathologic, Risk Factors, Amputation, Surgical, Diabetic Foot surgery, Diabetes Mellitus
- Abstract
Background: Reamputation as a complication of diabetic foot ulcers presents a high economic burden and represents a therapeutic failure. It is paramount to identify as early as possible patients in whom a minor amputation may not be the best option. The purpose of this investigation was to do a case-controlled study to determine risk factors associated with re-amputation in patients with DFU (diabetic foot ulcers) at two University Hospitals., Methods: Multicentric, observational, retrospective, case-control study from clinical records of 2 university hospitals. Our study included 420 patients, with 171 cases (re-amputations), and 249 controls. We performed a multivariate logistic regression analysis and time-to-event survival analysis to identify re-amputation risk factors., Results: Statistically significant risk factors were artery history of tobacco use (p = 0.001); male sex (p = 0.048); arterial occlusion in Doppler ultrasound (p = 0.001); percentage of stenosis in arterial ultrasound >50 % (p = 0.053); requirement of vascular intervention (p = 0.01); and microvascular involvement in photoplethysmography (p = 0.033). The most parsimonious regression model suggests that history of tobacco use, male sex, arterial occlusion in ultrasound, and percentage of stenosis in arterial ultrasound >50 % remained statistically significant. The survival analysis identified earlier amputations in patients with larger occlusion in arterial ultrasound, high leukocyte count, and elevated ESR., Conclusion: Direct and surrogate outcomes in patients with diabetic foot ulcers identify vascular involvement as an important risk factor for reamputation., Level of Evidence: III., Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2023 The Authors. Published by Elsevier Ltd.. All rights reserved.)
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- 2023
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38. Determination of time in range associated with HbA1c ≤ 6.5% in Latin American pregnant women diagnosed with type 1 diabetes mellitus using an automated insulin delivery system.
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María Gómez Medina A, Juliana Soto Chávez M, Cristina Henao Carrillo D, Camilo Salgado Sánchez J, Alberto Gómez González J, Grassi B, and Mauricio Muñoz Velandia O
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- Humans, Female, Pregnancy, Adult, Glycated Hemoglobin, Blood Glucose metabolism, Pregnant Women, Latin America, Prospective Studies, Blood Glucose Self-Monitoring, Diabetes Mellitus, Type 1 drug therapy, Diabetes Mellitus, Type 2 diagnosis, Insulins
- Abstract
Aims: To determine the correlation between %TIR and HbA1c in pregnant women with type 1 diabetes mellitus (DM1)., Methods: Diagnostic test study in a prospective cohort of pregnant patients with DM1 using automated insulin delivery system (AID)in Colombia and Chile., Results: Fifty-two patients were included [mean age 31.8 ± 6.2 years, pregestational HbA1c 7.2% [interquartile range (IQR), 6.5-8.2]. During follow-up, we found a better metabolic control during the second (HbA1c 6.40%, IQR 5.9,7.1) and third trimesters (HbA1c 6.25%;IQR 5.9,6.8). A weak and negative correlation between %TIR and HbA1c was found for all the gestation (Spearman's rank correlation coefficient:-0.22, p:0.0329), and in the second (r:-0.13, p: 0.38) and third trimesters (r:-0.26, p = 0.08). %TIR had poor discriminating capacity for predicting HbA1c < 6% (area under the curve [AUC], 0.59; 95% confidence interval [CI],0.46-0.72) and for predicting HbA1c < 6.5% (AUC, 0.57;95% CI,0.44-0.70). The optimal cutoff points for %TIR were > 66.1% for predicting HbA1c < 6% (65% sensitivity, 62% specificity) and %TIR > 61.1% for HbA1c < 6.5% (59% sensitivity, 54% specificity)., Conclusion: The correlation between HbA1c and %TIR during pregnancy was weak. The optimal cutoff points for identifying patients with HbA1c < 6.0% and < 6.5% were %TIR > 66.1% and > 61.1%, respectively, with moderate sensitivity and specificity., Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2023. Published by Elsevier B.V.)
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- 2023
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39. Plant extract from Caesalpinia spinosa inhibits cancer-associated fibroblast-like cells generation and function in a tumor microenvironment model.
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Jiménez MC, Prieto K, Lasso P, Gutiérrez M, Rodriguez-Pardo V, Fiorentino S, and Barreto A
- Abstract
Interactions in the tumor microenvironment (TME) between tumor cells and stromal cells such as cancer-associated fibroblasts (CAF) favor increased survival, progression, and transformation of cancer cells by activating mechanisms of invasion and metastasis. The design of new therapies to modulate or eliminate the CAF phenotype or functionality has been the subject of recent research including natural product-based therapies. We have previously described the generation of a standardized extract rich in polyphenols obtained from the Caesalpinia spinosa plant (P2Et), which present antitumor activities in breast cancer and melanoma models through activities that modulate the metabolism of tumor cells or induce the development of the immune response. In this work, a model of CAF generation was initially developed from the exposure of 3T3 fibroblasts to the cytokine TGFβ1. CAF-like cells generated in this way exhibited changes in the expression of Caveolin-1 and α-SMA, and alterations in glucose metabolism and redox status, typical of CAFs isolated from tumor tissues. Then, P2Et was shown to counteract in vitro-induced CAF-like cell generation, preventing caveolin-1 loss and attenuating changes in glucose uptake and redox profile. This protective effect of P2Et translates into a decrease in the functional ability of CAFs to support colony formation and migration of 4T1 murine breast cancer tumor cells. In addition to the functional interference, the P2Et extract also decreased the expression of genes associated with the epithelial-mesenchymal transition (EMT) and functional activities related to the modulation of the cancer stem cells (CSC) population. This work is an in vitro approach to evaluate natural extracts' effect on the interaction between CAF and tumor cells in the tumor microenvironment; thus, these results open the chance to design a more profound and mechanistic analysis to explore the molecular mechanisms of P2Et multimolecular activity and extent this analysis to an in vivo perspective. In summary, we present here a standardized polymolecular natural extract that has the potential to act in the TME by interfering with CAF generation and functionality., Competing Interests: S.F. is the inventor of a granted patent related to P2Et. The rest of the authors declare no competing interests., (© 2023 The Authors.)
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- 2023
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40. Human recombinant cementum protein 1, dental pulp stem cells, and PLGA/hydroxyapatite scaffold as substitute biomaterial in critical size osseous defect repair in vivo.
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Colorado C, Escobar LM, Lafaurie GI, Durán C, and Perdomo-Lara SJ
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- Animals, Cell Differentiation, Dental Cementum, Dental Pulp, Humans, Osteogenesis, Rats, Rats, Wistar, Skull, Stem Cells, Tissue Scaffolds, Biocompatible Materials pharmacology, Durapatite pharmacology
- Abstract
Objective: To evaluate the healing response of critical defects in rat calvaria with recombinant cementum protein 1 (hrCEMP-1) combined with human dental pulp stem cells (hDPSC) and polylactide-co-glycolide/hydroxyapatite (PLGA/HA) scaffold., Methods: The effect of hrCEMP-1 on proliferation and differentiation of human dental stem cells (hDPSCs) toward a mineralizing-like phenotype was evaluated in monolayer and PLGA/HA scaffold by qPCR. 5 mm calvarial defects were created in Wistar rats and filled with: 1) PLGA/HA scaffold; 2) hDPSCs-PLGA/HA scaffold; 3) hrCEMP-1-hDPSc-PLGA/HA scaffold; 4) control (without scaffold). Bone formation was evaluated by histological-histomorphometric analysis, scanning electron microscopy (SEM) and radiographic evaluation. Comparisons between groups were made with a one-way analysis of variance ANOVA and Bonferroni post-hoc test., Results: In vitro results showed that the PLGA/HA scaffold loaded with hrCEMP-1 improved the proliferation and differentiation of hDPSCs towards a mineralization phenotype by inducing mRNA expression of ALP, OSX, RUNX2, OP, and COL-I genes. The hrCEMP-1/hDPSCs/-PLGA/HA scaffold resulted only in connective tissue formed after ten weeks of healing, larger central radiolucency, and a low peripheral density. We showed superior bone growth and repair with a PLGA/HA matrix scaffold alone and containing hDPSCs compared to the hrCEMP/cells group., Conclusions: PLGA/HA scaffold with hrCEMP-1 induces hDPSC commitment to mineralizing phenotype in vitro, but does not promote critical size osseous defect repair in vivo when it is included in a substitute biomaterial with hDPSc-PLGA/HA scaffold., (Copyright © 2022. Published by Elsevier Ltd.)
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- 2022
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41. The Relationship between the Chief Executive Officer's (CEO) Social Capital and Dynamic Capabilities: A Meta-Analysis of its Moderators.
- Author
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Durán WF and Aguado D
- Subjects
- Humans, Social Capital
- Abstract
CEO social capital has shown a positive association with dynamic capabilities, although correlations have considerable heterogeneity among them. This meta-analysis estimates the correlation between CEO social capital and dynamic capabilities, and analyses moderator variables in explaining the heterogeneity in the results. Moderators are classified across four levels from macro to micro variables: country variables, firm environment, firm characteristics, and CEO variables. We apply a systematic search for studies in the Web of Science, Scopus, EBSCO, ProQuest, and Google Scholar databases. Additionally, we used a three-level random-effect meta-analysis on 89 correlations published between 2008 and 2021 from 9,272 CEOs. Findings indicate a positive correlation between CEO social capital and dynamic capabilities. Furthermore, we identified a moderator effect in the country and firm environment level. We found that the country of the study, the perception of transparency and legality in the country, and the environmental dynamism in the market moderate the size of the correlations. We also reject other moderators, including the individualism-collectivism national culture, firm size, the sources of social capital (business or political ties), and the dimension of the social capital (structural, relational or cognitive). This study contributes to the exploration of the sources of dynamic capabilities from the micro-foundation, identifies moderator variables that explain the heterogeneity in the results, and highlights the social nature of management activities which always evolve in a social context.
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- 2022
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42. OCT retinal nerve fiber layer thickness differentiates acute optic neuritis from MOG antibody-associated disease and Multiple Sclerosis: RNFL thickening in acute optic neuritis from MOGAD vs MS.
- Author
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Chen JJ, Sotirchos ES, Henderson AD, Vasileiou ES, Flanagan EP, Bhatti MT, Jamali S, Eggenberger ER, Dinome M, Frohman LP, Arnold AC, Bonelli L, Seleme N, Mejia-Vergara AJ, Moss HE, Padungkiatsagul T, Stiebel-Kalish H, Lotan I, Hellmann MA, Hodge D, Oertel FC, Paul F, Saidha S, Calabresi PA, and Pittock SJ
- Subjects
- Adult, Cross-Sectional Studies, Female, Humans, Middle Aged, Nerve Fibers, Tomography, Optical Coherence methods, Multiple Sclerosis complications, Multiple Sclerosis diagnostic imaging, Optic Neuritis diagnosis
- Abstract
Background: Optic neuritis (ON) is the most common manifestation of myelin oligodendrocyte glycoprotein antibody associated disorder (MOGAD) and multiple sclerosis (MS). Acute ON in MOGAD is thought to be associated with more severe optic disk edema than in other demyelinating diseases, but this has not been quantitatively confirmed. The goal of this study was to determine whether optical coherence tomography (OCT) can distinguish acute ON in MOGAD from MS, and establish the sensitivity of OCT as a confirmatory biomarker of ON in these entities., Methods: This was a multicenter cross-sectional study of MOGAD and MS patients with peripapillary retinal nerve fiber layer (pRNFL) thickness measured with OCT within two weeks of acute ON symptom. Cirrus HD-OCT (Carl Zeiss Meditec, Inc. Dublin, CA, USA) was used to measure the pRNFL during acute ON. Eyes with prior ON or disk pallor were excluded. A receiver operating characteristic (ROC) curve analysis was performed to assess the ability of pRNFL thickness to distinguish MOGAD from MS., Results: Sixty-four MOGAD and 50 MS patients met study inclusion criteria. Median age was 46.5 years (interquartile range [IQR]: 34.3-57.0) for the MOGAD group and 30.4 years (IQR: 25.7-38.4) for the MS group (p<0.001). Thirty-nine (61%) of MOGAD patients were female compared to 42 (84%) for MS (p = 0.007). The median pRNFL thickness was 164 µm (IQR: 116-212) in 96 acute MOGAD ON eyes compared to 103 µm (IQR: 93-113) in 51 acute MS ON eyes (p<0.001). The ROC area under the curve for pRNFL thickness was 0.81 (95% confidence interval 0.74-0.88) to discriminate MOGAD from MS. The pRNFL cutoff that maximized Youden's index was 118 µm, which provided a sensitivity of 74% and specificity of 82% for MOGAD. Among 31 MOGAD and 48 MS eyes with an unaffected contralateral eye or a prior baseline, the symptomatic eye had a median estimated pRNFL thickening of 45 µm (IQR: 17-105) and 7.5 µm (IQR: 1-18), respectively (p<0.001). All MOGAD affected eyes had a ≥ 5 µm pRNFL thickening, whereas 26 (54%) MS affected eyes had a ≥ 5 µm thickening., Conclusion: OCT-derived pRNFL thickness in acute ON can help differentiate MOGAD from MS. This can aid with early diagnosis and guide disease-specific therapy in the acute setting before antibody testing returns, and help differentiate borderline cases. In addition, pRNFL thickening is a sensitive biomarker for confirming acute ON in MOGAD, which is clinically helpful and could be used for adjudication of attacks in future MOGAD clinical trials., (Copyright © 2022. Published by Elsevier B.V.)
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- 2022
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43. Implementing a Redcap-based research data collection system for mental health.
- Author
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Marroquin Rivera A, Rosas-Romero JC, Castro SM, Suárez-Obando F, Aguilera-Cruz J, Bartels SM, Park S, Torrey WC, and Gómez-Restrepo C
- Subjects
- Colombia, Data Collection, Humans, Software, Biomedical Research, Mental Health
- Abstract
Background: The implementation of new technologies in medical research, such as novel big storage systems, has recently gained importance. Electronic data capture is a perfect example as it powerfully facilitates medical research. However, its implementation in resource-limited settings, where basic clinical resources, internet access, and human resources may be reduced might be a problem., Methods: In this paper we described our approach for building a network architecture for data collection to achieve our objectives using a REDCap® tool in Colombia and provide guidance for data collection in similar settings., Conclusions: REDCap is a feasible and efficient electronic data capture software to use in similar contexts to Colombia. The software facilitated the whole data management process and is a way to build research capacities in resourced-limited settings., (Copyright © 2021. Published by Elsevier España, S.L.U.)
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- 2021
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44. Health-related quality of life and health literacy among adult primary care patients with subsidized or contributive health insurance in Colombia.
- Author
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Lemley SM, Castro-Diaz S, Cubillos L, Suárez-Obando F, Torrey WC, Uribe-Restrepo JM, Williams M, Marsch LA, and Gómez-Restrepo C
- Subjects
- Adult, Colombia, Humans, Insurance, Health, Primary Health Care, Health Literacy, Quality of Life
- Abstract
Context: Colombia passed Law 100 in 1993 with the goal of providing universal health care coverage, and by 2013, over 96% of the Colombian population had health insurance coverage. However, little is known about how health-related quality of life (HRQoL) and health literacy are related among those with the two most common types of health insurance coverage: subsidized (those with lower incomes) and contributory (those with higher incomes) coverage., Objectives and Methods: In the current exploratory investigation, data from adults visiting six primary care clinics in Colombia were analysed to examine the relationship between HRQoL (assessed as problems with mobility, self-care, completing usual activities, pain/discomfort, and anxiety/depression), demographics, the two health insurance types, and health literacy. Analyses also assessed whether, within insurance types, health literacy was related to HRQoL., Results: Results showed that those with contributory health insurance coverage had greater health literacy than those with subsidized coverage, and this was accounted for by differences in education and socioeconomic status. HRQoL did not differ by insurance type. Although lower health literacy was related to worse HRQoL in the overall sample, in subgroup analyses lower health literacy significantly related to worse HRQoL only among those with subsidized health insurance coverage., Conclusion: Targeting skills which contribute to health literacy, such as interpreting medical information or filling out forms, may improve HRQoL, particularly in those with subsidized insurance coverage., (Copyright © 2021. Published by Elsevier España, S.L.U.)
- Published
- 2021
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45. Patterns of digital information and communication technology use among patients at primary health care centres in Colombia: Phase I of the DIADA project.
- Author
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Suárez-Obando F, Gómez-Restrepo C, Castro-Diaz S, Paez-Rojas P, Uribe-Restrepo JM, Naslund JA, Torrey WC, Cubillos L, Bartels SM, Williams MJ, and Marsch LA
- Subjects
- Colombia, Humans, Primary Health Care, Technology, Communication, Information Technology
- Abstract
Objective: Assess the prevalence and types of digital technology use, as well as the extent to which patients use the internet and mobile devises. Evaluate the socioeconomic characteristics of patients and the possible relation to patterns of technology use in Colombia. Understand the nature of patient technology use in primary care for finding medical information., Methods: A survey was applied to adult patients who attended primary health care centers systems in 6 Colombian cities. The survey inquired about demographic characteristics, insurance, access to services, cell phone use, internet access, and the use of such technology to access health-related services and information. Data was collected and managed using REDCap. Summary statistics on each survey item were calculated and the differences between discrete variables were analyzed using chi-square. Multivariate analyses were performed using logistic regression analysis for binary dependent variables., Results: A total of 1580 patients were surveyed across the six study sites. 93% of the patients reported they have a cell phone. Patients from urban healthcare centers showed a higher use of the Internet on their phone than less urban settings. Around half of the surveyed patients reported Internet use (49.7%). Among Internet users, 65% of participants use the Internet looking for health care information. Around one-third of patients use cellphones to arrange clinic visits. Around 24% of participants answered positively for both Whooley's questions. Of those who screened positive on the Whooley questions, 43% reported being moderately anxious, 47% reported being very anxious. 51% reported having moderate pain; 52% reported having severe pain., Conclusions: The patterns of technology use identified in this study are essential for developing future health interventions based on ICT. The design of ICT clinical interventions must take into account the cellphone payment plans, availability of internet connection, advantages, and disadvantages of messenger services, including SMS as a possible alternative to people who do not have smartphones., (Copyright © 2021. Published by Elsevier España, S.L.U.)
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- 2021
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46. The effectiveness and cost-effectiveness of integrating mental health services in primary care in low- and middle-income countries: systematic review.
- Author
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Cubillos L, Bartels SM, Torrey WC, Naslund J, Uribe-Restrepo JM, Gaviola C, Díaz SC, John DT, Williams MJ, Cepeda M, Gómez-Restrepo C, and Marsch LA
- Abstract
Aims and Method: This systematic review examines the effectiveness and cost-effectiveness of behavioural health integration into primary healthcare in the management of depression and unhealthy alcohol use in low- and middle-income countries. Following PRISMA guidelines, this review included research that studied patients aged ≥18 years with unhealthy alcohol use and/or depression of any clinical severity. An exploration of the models of integration was used to characterise a typology of behavioural health integration specific for low- and middle-income countries., Results: Fifty-eight articles met inclusion criteria. Studies evidenced increased effectiveness of integrated care over treatment as usual for both conditions. The economic evaluations found increased direct health costs but cost-effective estimates. The included studies used six distinct behavioural health integration models., Clinical Implications: Behavioural health integration may yield improved health outcomes, although it may require additional resources. The proposed typology can assist decision-makers to advance the implementation of integrated models.
- Published
- 2021
- Full Text
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47. Commentary to: "Eighteen years of experience with pediatric nutcracker syndrome: The importance of conservative approach".
- Author
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Prada S and Fernandez N
- Subjects
- Child, Humans, Renal Veins, Renal Nutcracker Syndrome
- Published
- 2020
- Full Text
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48. COVID-19: The forgotten priorities of the pandemic.
- Author
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Mesa Vieira C, Franco OH, Gómez Restrepo C, and Abel T
- Subjects
- Aged, COVID-19, Developing Countries, Humans, Mental Health, Social Isolation psychology, Vulnerable Populations, Coronavirus Infections epidemiology, Coronavirus Infections prevention & control, Health Priorities, Pandemics prevention & control, Pneumonia, Viral epidemiology, Pneumonia, Viral prevention & control
- Abstract
The zoonotic virus now named SARS-CoV-2 first infected humans in China, and COVID-19 has rapidly become pandemic. To mitigate its impact on societies, health systems and economies, countries have adopted non-pharmacological preventive practices such as 'spatial' or 'social' distancing, the use of protective masks, and handwashing; these have been widely implemented. However, measures aimed at protecting physical health and healthcare systems have side-effects that might have a big impact on individuals' wellbeing. As the pandemic reaches low- and middle-income countries, weaker health systems, limited resources and the lower socioeconomic status of their populations make halting the pandemic more challenging. In this article, we explore the impact of COVID-19 and its prevention measures on the wellbeing of vulnerable populations. Special attention must be given to homeless, indigenous, migrant and imprisoned populations, as well as people living with disabilities and the elderly. More than just resolute governmental action will be required to overcome the pandemic. Links between science and political actions have to be strengthened. Fighting COVID-19 is a collective endeavour and community action, on a global scale, is of paramount importance., (Copyright © 2020 The Author(s). Published by Elsevier B.V. All rights reserved.)
- Published
- 2020
- Full Text
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49. Born global: the influence of international orientation on export performance.
- Author
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Escandon-Barbosa D, Rialp-Criado J, Fuerst S, Rodriguez-Orejuela A, and Castro-Aristizabal G
- Abstract
New international enterprises that are referred to as Born Globals have become the subject of research due to the success of their global operations, despite their early internationalization and limited resources. Given the importance of analyzing the characteristics that contribute to the success of Born Globals, our study examines the influence of international orientation on export performance. Additionally, we consider internal and external drivers for early and accelerated internationalization such as the Born Global's innovative capacity, the dynamism of the market and the favorability of the environment. By estimating a structural equation model, the results show that international orientation is a strong driver of the export performance of Born Globals. However, this relationship is moderated by innovative capacity and the dynamism and favorability of the environment, thus achieving a greater effect on export performance when international orientation is complemented by these variables., (© 2019 The Authors.)
- Published
- 2019
- Full Text
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50. Short exposure to a foreign accent impacts subsequent cognitive processes.
- Author
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Foucart A, Santamaría-García H, and Hartsuiker RJ
- Subjects
- Adult, Electroencephalography, Female, Humans, Male, Pupil physiology, Young Adult, Evoked Potentials physiology, Judgment physiology, Social Class, Social Perception, Speech Perception physiology, Visual Perception physiology
- Abstract
Although speaking a foreign language is undoubtedly an asset, foreign-accented speakers are usually perceived negatively. It is unknown, however, to what extent this bias impacts cognitive processes. Here, we used ERPs and pupillometry to investigate whether the negative bias generated by a short exposure to a foreign accent influences the overall perception of a speaker, even when the person is not speaking. We compared responses to written sentence comprehension, memory and visual perception, associated with native speakers (high and low social status) and a foreign-accented speaker (high social status). The foreign-accented speaker consistently fell in-between the high-status native speaker and the low-status native speaker. This is the first physiological demonstration that short exposure to a foreign accent impacts subsequent cognitive processes, and that foreign-accented speakers seem to be considered less reliable than native speakers, even with equally high social status. Awareness of this bias is essential to avoid discriminations in our multilingual society., (Copyright © 2019 Elsevier Ltd. All rights reserved.)
- Published
- 2019
- Full Text
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