151 results on '"Daniel Valencia"'
Search Results
2. La búsqueda de la felicidad en la literatura de autoayuda. Un desafío para la bioética
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Federico Vásquez Cardona, Daniel Valencia Cartagena, and José Arroyave Carvajal
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felicidad ,bioética ,autoayuda ,responsabilidad ,no maleficencia ,Jurisprudence. Philosophy and theory of law ,K201-487 ,Medical philosophy. Medical ethics ,R723-726 - Abstract
Esta investigación propone el análisis de los posibles riesgos asociados al consumo de libros de autoayuda, donde hay una constante búsqueda inmediatista de soluciones a los problemas de la vida cotidiana. El trabajo se enmarca en la metodología de artículo teórico. Se realizó una revisión bibliográfica en bases de datos científicas y de humanidades, además de considerar los antecedentes y el contexto relacionados con el tema abordado, seguido de un análisis de la información. Como resultado, se evidenció que existen riesgos asociados al uso de la autoayuda como método de solución para los problemas que afectan al sujeto contemporáneo en la sociedad, debido a la posibilidad de transgredir los principios de la bioética, además de la ausencia de implementación de los fundamentos acerca del alcance de la felicidad proporcionada por la neurociencia.
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- 2024
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3. Genetic Diversity of Mycobacterium tuberculosis Strains Isolated from HIV-Infected Patients in Mexico
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Daniel Valencia-Trujillo, Amanda Marineth Avila-Trejo, Rocío Liliana García-Reyes, Luis Narváez-Díaz, Mariela Segura del Pilar, Mario Alberto Mújica-Sánchez, Eduardo Becerril-Vargas, Moises León-Juárez, Mónica Maribel Mata-Miranda, Sandra Rivera-Gutiérrez, and Jorge Francisco Cerna-Cortés
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Mycobacterium tuberculosis ,tuberculosis ,genetic diversity ,HIV-infected patients ,Medicine - Abstract
There has been very limited investigation regarding the genetic diversity of Mycobacterium tuberculosis (MTb) strains isolated from human immunodeficiency virus (HIV)-infected patients in Mexico. In this study, we isolated 93 MTb strains from pulmonary and extrapulmonary samples of HIV-infected patients treated in a public hospital in Mexico City to evaluate the genetic diversity using spoligotyping and mycobacterial interspersed repetitive unit-variable-number tandem-repeat (MIRU-VNTR) typing (based on 24 loci). The cohort comprised 80 male and 13 female individuals. There was a positive correlation between a high HIV viral load (>100,000 copies) and extrapulmonary tuberculosis (TB) (r = 0.306, p = 0.008). Lineage 4 was the most frequent lineage (79 strains). In this lineage, we found the H clade (n = 24), including the Haarlem, H3, and H1 families; the T clade (n = 22), including T1 and T2; the X clade (n = 15), including X1 and X3; the LAM clade (n = 14), including LAM1, LAM2, LAM3, LAM6, and LAM9; the S clade (n = 2); Uganda (n = 1); and Ghana (n = 1). We also found 12 strains in the EAI clade belonging to lineage 1, including the EAI2-Manila and EAI5 families. Interestingly, we identified one strain belonging to the Beijing family, which is part of lineage 2. One strain could not be identified. This study reports high genetic diversity among MTb strains, highlighting the need for a molecular epidemiological surveillance system that can help to monitor the spread of these strains, leading to more appropriate measures for TB control in HIV-infected patients.
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- 2024
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4. Bio Anorí, the biological expedition that documented fish diversity after the post-conflict in Antioquia, Colombia
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Daniel Restrepo-Santamaria, Daniel Valencia-Rodríguez, Juliana Herrera-Pérez, Sebastián Muñoz-Duque, Andrés Felipe Galeano, and Luz Jiménez-Segura
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Neotropical fish ,Magdalena basin ,Conservation ,Diversity ,Environmental conditions ,Gold mining ,Ecology ,QH540-549.5 - Abstract
The peace process in Colombia allowed biodiversity experts to visit unexplored regions in the tropical Andes mountains. The diversity of fish species and characteristics of the aquatic environments (creeks, streams, and river channels) in which they live were determined by means of the Bio Anorí expedition. During the expedition, we evidenced the presence of alluvial mining activity, and we contrasted the environmental characteristics of the sites without disturbances with those where there was mining activity. A total of 478 specimens were captured, representing 22 endemic species of the region. The dominant species (Brycon henni, Chaetostoma aff. brevilabiatum, Creagrutus affinis) were distributed in the three environments, while the less abundant species (e.g., Leptoancistrus or Characidium) were captured in a particular environment. The number of species captured in each aquatic environment was representative and adjusted to the values expected to be obtained. Stream environments harbored a higher diversity of fish. A representative species inventory was inferred; however, this analysis suggested that it is possible to capture more species in the aquatic environments evaluated. The composition of assemblages was similar among aquatic environments; although, differences were observed between creeks and rivers. Stream environments connected creeks and river assemblages. In terms of environmental characteristics, the evaluated streams and creeks were cold, more transparent, and highly oxygenated; the opposite occurred in the rivers, which were less oxygenated, more turbid, and warmer. Canonical correspondence analysis suggested that species composition was influenced by the physicochemical conditions of the water. This study provides information associated with fish distribution in a region of the Colombian Andes that was under an armed conflict for more than five decades. In addition, it allowed us to observe habitat transformations because of alluvial mining activity. Finally, it is essential to continue exploring remote areas to know their preservation status and apply conservation measures.
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- 2023
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5. Phenotypic and Genotypic Drug Resistance of Mycobacterium tuberculosis Strains Isolated from HIV-Infected Patients from a Third-Level Public Hospital in Mexico
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Daniel Valencia-Trujillo, Amanda Marineth Avila-Trejo, Rocío Liliana García-Reyes, Luis Narváez-Díaz, Mario Alberto Mújica-Sánchez, Addy Cecilia Helguera-Repetto, Eduardo Becerril-Vargas, Mónica Maribel Mata-Miranda, Sandra Rivera-Gutiérrez, and Jorge Francisco Cerna-Cortés
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Mycobacterium tuberculosis ,tuberculosis ,drug susceptibility test ,HIV-infected patients ,Medicine - Abstract
Background: Drug-resistant tuberculosis (TB) is associated with higher mortality rates in patients with human immunodeficiency virus (HIV). In Mexico, the number of deaths due to TB among the HIV-positive population has tripled in recent years. Methods: Ninety-three Mycobacterium tuberculosis strains isolated from the same number of HIV-infected patients treated in a public hospital in Mexico City were studied to determine the drug resistance to first- and second-line anti-TB drugs and to identify the mutations associated with the resistance. Results: Of the 93 patients, 82.7% were new TB cases, 86% were male, and 73% had extrapulmonary TB. Most patients (94%) with a CD4 T-lymphocyte count 3 were associated with extrapulmonary TB (p 350 cells/mm3 were associated with pulmonary TB (p = 0.0011). Eighty-two strains were pan-susceptible, four mono-resistant, four poly-resistant, two multidrug-resistant, and one was extensively drug-resistant. In the rifampicin-resistant strains, rpoB S531L was the mutation most frequently identified, whereas the inhA C15T and katG S315T1 mutations were present in isoniazid-resistant strains. The extensively drug-resistant strain also contained the mutation gyrA D94A. Conclusions: These data highlight the need to promptly diagnose the drug resistance of M. tuberculosis among all HIV-infected patients by systematically offering access to first- and second-line drug susceptibility testing and to tailor the treatment regimen based on the resistance patterns to reduce the number of deaths in HIV-infected patients.
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- 2024
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6. Evaluation of the Removal and Effects of Cylindrospermopsin on Ripened Slow Sand Filters
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Daniel Valencia-Cárdenas, Thatiane Souza Tavares, Rafaella Silveira, Cristina Celia Silveira Brandão, Raquel Moraes Soares, and Yovanka Pérez Ginoris
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cylindrospermopsin ,slow sand filtration ,schmutzdecke ,water treatment ,microbiota ,Medicine - Abstract
The occurrence of toxic blooms of cyanobacteria has been a matter of public health interest due to the cyanotoxins produced by these microorganisms. Cylindrospermopsin (CYN) is a cyanotoxin of particular concern due to its toxic effects on humans. This study investigated the removal and effects of CYN in ripened slow sand filters (SSFs) treating water from Paranoá Lake, Brasilia, Brazil. Four pilot-scale SSFs were ripened and operated for 74 days. Two contamination peaks with CYN were applied along the filtration run. The improvement of any of the evaluated water quality parameters was not affected by the presence of CYN in the raw water. The SSFs efficiently removed CYN, presenting concentrations lower than 0.8 µg/L in the filtered water. The microbiota of the SSFs were dominated by protozoa of the genus Euglypha and amoebas of the genera Arcella, Centropyxis, and Amoeba, together with some groups of rotifers. These microorganisms played a crucial role in removing total coliforms and E. coli. In addition, CYN was not identified as a determining factor in the microbiota composition.
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- 2023
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7. Clinical, Biochemical, and ATR-FTIR Spectroscopic Parameters Associated with Death or Survival in Patients with Severe COVID-19
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Adriana Martinez-Cuazitl, Monica M. Mata-Miranda, Miguel Sanchez-Brito, Daniel Valencia-Trujillo, Amanda M. Avila-Trejo, Raul J. Delgado-Macuil, Consuelo Atriano-Colorado, Francisco Garibay-Gonzalez, Virginia Sanchez-Monroy, and Gustavo J. Vazquez-Zapien
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Optics. Light ,QC350-467 - Abstract
The wide range of symptoms of the coronavirus disease 2019 (COVID-19) makes it challenging to predict the disease evolution using a single parameter. Therefore, to describe the pathophysiological response to SARS-CoV-2 infection in hospitalized patients with severe COVID-19, we compared according to survival or death, the sociodemographic and clinical characteristics, the biochemical and immunological attenuated total reflection-Fourier transform infrared (ATR-FTIR) spectra from saliva samples and their correlation with chemometric findings. Herein, we demonstrate that ATR-FTIR spectroscopy allows the description of the events related to cell damage, such as lipids biogenesis and the secondary structure of proteins associated with lactate dehydrogenase and albumin levels. Moreover, humoral (IgM) and cellular (IFN-γ, TNF-α, IL-10, and IL-6) responses were also increased in patients who died from COVID-19.
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- 2023
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8. Inventarios de peces en la cuenca del río Magdalena (Colombia) como herramienta para la gestión de su conservación
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Daniel Restrepo-Santamaria, Juliana Herrera-Pérez, Sebastián Muñoz-Duque, Juan Guillermo Ospina-Pabón, Juan Pablo Londoño, Carlos Alejandro Loaiza-Santana, Jonathan Álvarez-Bustamante, Daniel Valencia-Rodríguez, and Luz Jiménez-Segura
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amenazas a la conservación ,cuenca magdalena-cauca ,peces neotropicales ,predicción de especies ,Science ,Zoology ,QL1-991 ,Botany ,QK1-989 - Abstract
Los inventarios de riqueza íctica a lo largo del intervalo de elevación de los ríos andinos son herramien-tas para generar estrategias de conservación en la región, así que su exhaustividad es definitiva para tomar decisiones acertadas. Se revisó el material depositado en cinco colecciones biológicas, y también el recolectado en tres exploraciones realizadas en los años 2014, 2015 y 2016 en 64 localidades que drenan hacia la cuenca hidrográfica del río Magdalena. La riqueza estuvo conformada por 115 especies de peces. Se encontró que la tasa de disminución en el número de especies fue de 54 por cada 900 m. de elevación. Mediante un modelo de predicción de especies demostramos que solo se alcanzó a registrar el número total de especies en el intervalo de 300-600 m. y en la zona altoandina. Esto sugiere que es necesario un mayor esfuerzo de muestreo para obtener una suficiente representación de la riqueza real estimada para cada intervalo de elevación. Adicionalmente, se detectaron diferentes amenazas sobre los cuerpos de agua en los intervalos de elevación, tales como ganadería extensiva y agricultura, extrac-ción de minerales sin regulaciones, generación de energía hidroeléctrica, así como el uso de los peces como recurso proteico, incluyendo el cultivo de especies introducidas. A medida que la modificación de hábitats continúe sin una adecuada planeación, se corre el riesgo de afectar la riqueza y distribución de especies de peces en la cuenca, por lo tanto, es importante conocer sus aspectos ecológicos, que permitirán proponer recomendaciones y oportunidades para su conservación.
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- 2021
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9. Ensamblajes de peces en embalses altoandinos: El caso de los embalses Quebradona y Riogrande II en la cuenca Magdalena
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Lina María Martínez-Toro, Daniel Restrepo-Santamaría, Daniel Valencia-Rodríguez, and Luz Fernanda Jiménez-Segura
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peces del neotrópico ,especies no nativas ,ríos andinos ,Science ,Zoology ,QL1-991 ,Botany ,QK1-989 - Abstract
El desarrollo de producción hidro-energética al norte de los Andes de Sudamérica se ha centrado en la cuenca Magdalena. Para esta cuenca se reporta que el 68 % de las especies de peces son endémicas y no se han estudiado los efectos que producen estas estructuras sobre sus ensamblajes en los ríos de alta montaña. Este trabajo responde preguntas asociadas a las características que describen el ensam-blaje de peces y la influencia que ejercen algunas variables ambientales sobre su distribución en el transcurso de los periodos hidrológicos de sequía y lluvias en el área de influencia de dos embalses. Se capturaron siete especies de peces, cuatro de ellas no nativas de la cuenca. No se encontraron diferen-cias significativas de las abundancias entre los sistemas acuáticos y entre la temporalidad climática. La riqueza fue mayor en las quebradas y ríos. Los ensamblajes cambiaron según el sistema acuático, en embalses dominaron las especies no nativas Micropterus salmoides y Cyprinus carpio mientras que en las quebradas y ríos el ensamblaje estuvo conformado principalmente por Hemibrycon caucanusy Trichomycterus sp. Los ensamblajes no presentaron diferencias estadísticas entre periodos climáti-cos. Por otra parte, observamos que variables fisicoquímicas como el oxígeno y la transparencia, son importantes para la distribución de las especies no nativas en los embalses, y para las especies que se distribuyen en ríos y quebradas, la conductividad fue la variable más influyente. La información proporcionada en este estudio servirá de base para la gestión de la conservación de peces en los Andes.
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- 2021
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10. Rescate de peces aguas abajo de la presa Porce III (Colombia) para reducir su mortalidad
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Daniel Restrepo-Santamaria, Daniel Valencia-Rodríguez, Andrés Galeano, Juliana Herrera, and Luz Jiménez-Segura
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cuenca río magdalena ,embalse ,fragmentación de hábitat ,manejo de fauna silvestre ,peces neotropicales ,Biology (General) ,QH301-705.5 - Abstract
En la cuenca del río Magdalena, las actividades de rescate de peces son una medida de manejo ambiental utilizada para reducir su mortalidad en el área próxima a los embalses. Cuando se realiza la apertura y posterior cierre de compuertas del vertedero, producto de la operación de la central hidroeléctrica Porce III, aguas abajo de la presa se crean hábitats acuáticos temporales en forma de pozas marginales de lecho rocoso, en donde se presentan atrapamientos de peces. El objetivo del rescate es reubicarlos al canal principal del río para reducir su mortalidad. Entre los años 2013 y 2020 se capturaron 4927 individuos, representantes de 28 especies, 12 familias y cinco órdenes. Reubicamos a 4704 individuos nuevamente en el río Porce, siendo las especies de los géneros Chaetostoma, Andinoacara, Astyanax y Rhamdia los de mayor captura. También se capturaron especies potamodromas de la familia Pochilodontidae, cuya presencia próxima a la presa se debe posiblemente a migraciones que realizan para llevar a cabo su reproducción. Estas acciones de rescate y reubicación, producto de la operación de las centrales hidroeléctricas, deben ser replicadas en la cuenca como estrategia para mitigar los impactos ambientales ocasionados por la fragmentación del hábitat.
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- 2022
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11. Development and characterization of lime-based stucco for modern construction and restoration applications based on ancient stuccoes from the 'El Cerrito' pyramid, Querétaro, Mexico
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Mario E. Rodriguez-Juarez, Edgar Perez-Diaz, Guillermo I. Lopez-Dominguez, Veronica Leyva Picazo, Daniel Valencia-Cruz, Beatriz M. Millan-Malo, and Mario E. Rodriguez-Garcia
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Stucco ,Pyramid ,Lime ,Pozzolan ,Calcium hydroxide ,Calcium carbonate ,Materials of engineering and construction. Mechanics of materials ,TA401-492 - Abstract
This work studied the physical-chemical characteristics of two lime-based stucco samples extracted from the “El Cerrito” archeological site in Querétaro, Mexico. Their compositional analyses are consistent with calcite, labradorite (clay mineral), sand size quartz and volcanic lithics, and organic compounds. Scanning Electron Microscopy (SEM) images confirmed the use of micro and submicron natural fibers. Energy Dispersive Spectroscopy semi-quantitative analysis (EDS-SEM) showed Al, Mg, Ca, C, Si, K, and O as the major element components. Inductively Coupled Plasma (ICP) quantitative analysis found Ca, Al, Fe, Mg, and K as the major components, and Ba, P, S, Sr, Mn, Cr, and V, as minor and trace elements that produce a compelling fingerprint. X-ray diffraction patterns reveal that these stuccoes are formed by calcite and labradorite crystalline phases. These analyses were used to develop and reproduce a new stucco formulation that can be used to conserve and restore archeological buildings and as modern wall finishing. The new stucco is a heterogeneous mixture of calcium hydroxide, pozzolan (alunite-kaolinite), fine quartz sand, and volcanic lithics as an aggregate, and soluble and insoluble natural fibers obtained from nopal pads as additives. A step-by-step methodology to prepare and apply the newly formulated stucco in a modern house as a wall finishing is reported. Pozzolan, calcium hydroxide, and water react to produce the pozzolanic effect acting as a non-hydraulic cement, while calcium hydroxide reacts with the atmospheric CO2 to form calcium carbonate. Portlandite conversion to calcite and the pozzolanic effect to obtain labradorite were shown by X-ray analysis and high-resolution SEM images of the newly applied stucco.
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- 2022
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12. Fish community turnover in a dammed Andean River over time
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Daniel Valencia-Rodríguez, Juliana Herrera-Pérez, Daniel Restrepo-Santamaría, Andrés Galeano, R. Scott Winton, and Luz Jiménez-Segura
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Beta diversity ,Freshwater ichthyofauna ,Hydropower ,Long-term monitoring ,Magdalena River ,Zoology ,QL1-991 - Abstract
ABSTRACT We describe the change in the fish community of the Porce River in Magdalena River Basin, Colombia, following the construction of the Porce III hydropower reservoir based on 13 years of monitoring data. The results show a clear reduction of the number of native species, which have been supplanted by colonizing non-native species, especially in the reservoir. Four native species detected prior to dam construction have apparently disappeared, but 12 new species were registered post-construction. We analyzed spatial changes in beta diversity in the aquatic environments surrounding the dam. The new environment generated by the reservoir presents a unique species composition and contributes significantly to the total beta diversity of the system. Altogether three distinct new fish assemblages emerged following reservoir formation and there are now six assemblages where there had previously been three. This dramatic change, already visible within a decade of construction, highlights just how strong of an impact dam construction has on habitats and how rapidly fish communities react in this hotspot for endemic fish diversity. Our findings demonstrate the importance of monitoring fish communities for revealing the impact of damming on river ecosystems and informs potential complementary fish diversity inventories elsewhere in the Magdalena River basin.
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- 2022
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13. Confort térmico en viviendas de Medellín
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Engelberth Soto-Estrada, Maria Fernanda Alvarez-Carrascal, Jairo Gomez-Lizarazo, and Daniel Valencia-Montoya
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confort térmico ,temperatura operativa ,temperatura radiante ,pmv ,ppd ,Technology ,Engineering (General). Civil engineering (General) ,TA1-2040 - Abstract
El ambiente térmico en una edificación influye en la salud, el bienestar y la productividad de las personas, así como en el consumo energético. La importancia del confort térmico en las edificaciones se reconoce desde hace décadas, no obstante, este aspecto es aún incipiente en la industria de la construcción colombiana, sobre todo en proyectos de vivienda. En esta investigación se analizó el desempeño térmico de tres tipos de vivienda comunes en la ciudad de Medellín. Para ello se calculó la temperatura operativa, el voto medio estimado (PMV) y el porcentaje estimado de insatisfechos (PPD), de acuerdo con la norma ISO 7730:2005. Los resultados mostraron que la inercia térmica de dos de los tres tipos de vivienda examinados no es suficiente para ofrecer un confort térmico adecuado, a pesar del clima templado del Valle de Aburrá. Estos resultados alertan sobre la vulnerabilidad de la población urbana en Colombia ante fluctuaciones extremas de temperatura.
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- 2019
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14. Evaluation of silver nanoparticles for the prevention of SARS-CoV-2 infection in health workers: In vitro and in vivo.
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Horacio Almanza-Reyes, Sandra Moreno, Ismael Plascencia-López, Martha Alvarado-Vera, Leslie Patrón-Romero, Belén Borrego, Alberto Reyes-Escamilla, Daniel Valencia-Manzo, Alejandro Brun, Alexey Pestryakov, and Nina Bogdanchikova
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Medicine ,Science - Abstract
SARS-CoV-2 infection in hospital areas is of a particular concern, since the close interaction between health care personnel and patients diagnosed with COVID-19, which allows virus to be easily spread between them and subsequently to their families and communities. Preventing SARS-CoV-2 infection among healthcare personnel is essential to reduce the frequency of infections and outbreaks during the pandemic considering that they work in high-risk areas. In this research, silver nanoparticles (AgNPs) were tested in vitro and shown to have an inhibitory effect on SARS-CoV-2 infection in cultured cells. Subsequently, we assess the effects of mouthwash and nose rinse with ARGOVIT® silver nanoparticles (AgNPs), in the prevention of SARS-CoV-2 contagion in health workers consider as high-risk group of acquiring the infection in the General Tijuana Hospital, Mexico, a hospital for the exclusive recruitment of patients diagnosed with COVID-19. We present a prospective randomized study of 231 participants that was carried out for 9 weeks (during the declaration of a pandemic). The "experimental" group was instructed to do mouthwash and nose rinse with the AgNPs solution; the "control" group was instructed to do mouthwashes and nose rinse in a conventional way. The incidence of SARS-CoV-2 infection was significantly lower in the "experimental" group (two participants of 114, 1.8%) compared to the "control" group (thirty-three participants of 117, 28.2%), with an 84.8% efficiency. We conclude that the mouth and nasal rinse with AgNPs helps in the prevention of SARS-CoV-2 infection in health personnel who are exposed to patients diagnosed with COVID-19.
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- 2021
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15. Ecological niche modeling as an effective tool to predict the distribution of freshwater organisms: The case of the Sabaleta Brycon henni (Eigenmann, 1913).
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Daniel Valencia-Rodríguez, Luz Jiménez-Segura, Carlos A Rogéliz, and Juan L Parra
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Medicine ,Science - Abstract
Ecological niche models (ENMs) aim to recreate the relationships between species and the environments where they occur and allow us to identify unexplored areas in geography where these species might be present. These models have been successfully used in terrestrial organisms but their application in aquatic organisms is still scarce. Recent advances in the availability of species occurrences and environmental information particular to aquatic systems allow the evaluation of these models. This study aims to characterize the niche of the Sabaleta Brycon henni Eigenmann 1913, an endemic fish of the Colombian Andes, using ENMs to predict its geographical distribution across the Magdalena Basin. For this purpose, we used a set of environmental variables specific to freshwater systems in addition to the customary bioclimatic variables, and species' occurrence data to model its potential distribution using the Maximum Entropy algorithm (MaxEnt). We evaluate the relative importance between these two sets of variables, the model's performance, and its geographic overlap with the IUCN map. Both on-site (annual precipitation, minimum temperature of coldest month) and upstream variables (open waters, average minimum temperature of the coldest month and average precipitation seasonality) were included in the models with the highest predictive accuracy. With an area under the curve of 90%, 99% of the species occurrences and 68% of absences correctly predicted, our results support the good performance of ENMs to predict the potential distribution of the Sabaleta and the utility of this tool in conservation and decision-making at the national level.
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- 2021
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16. Histoplasmosis Diseminada en paciente Inmunocompetentes
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Daniel Valencia Sancho, Jacqueline Loza Santillan, Paulina Santana Vargas, Paula Zambrano-Achig, and Francisco Pérez Tasigchana
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histoplasmosis ,síndrome antifosfolípido ,lupus eritematoso sistémico ,Public aspects of medicine ,RA1-1270 - Abstract
La histoplasmosis es una infección micótica que se adquiere por inhalación causando enfermedad pulmonar en su forma primaria. Puede diseminarse a otros órganos sobre todo en pacientes inmunodeprimidos en quienes alcanza una alta mortalidad. Es endémica en ciertas zonas, en especial las templadas y tropicales. Las manifestaciones clínicas varían según la diseminación y estado inmunológico de la persona. El diagnóstico se lo realiza por la identificación histopatológica, cultivo y serología. Paciente femenina adulta joven afroamericana sin antecedentes clínicos que presenta cuadro de un año de evolución caracterizado por pérdida involuntaria de peso, alopecia, lesiones dérmicas hiperpigmentadas, diarrea y adenopatías cervicales cuyo estudio histopatológico fue compatible con histoplasmosis. Estudios de extensión sugirieron, pero no confirmaron, una patología autoinmune asociada. En Ecuador no existe registro de casos de histoplasmosis a pesar de ser considerada una micosis endémica en la zona. El estudio de inmunocompetencia en el caso presente fue sugestivo de un lupus eritematoso sistémico con manifestaciones solapadas. Los pacientes con Lupus Eritematoso Sistémico son susceptibles a infecciones oportunistas por hongos dado a defectos inmunológicos intrínsecos con alteración de la inmunidad celular. La histoplasmosis es una enfermedad endémica en nuestro medio, infradiagnosticada por la diversidad del cuadro clínico y su asociación con otras patologías.
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- 2020
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17. Modelling and Simulation of Bifacial PV Production Using Monofacial Electrical Models
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Salim Bouchakour, Daniel Valencia-Caballero, Alvaro Luna, Eduardo Roman, El Amin Kouadri Boudjelthia, and Pedro Rodríguez
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analytical and empirical models ,bifacial power generation modeling ,bifacial solar panels ,photovoltaic monitoring ,Technology - Abstract
In this paper, we investigate the use of monofacial PV models to simulate the production of bifacial PV systems over different albedos. Analytical and empirical models were evaluated using measured data obtained from three identical bifacial PV arrays: (1) with the backside covered by white plastic, (2) with normal albedo, and (3) with high albedo. The front-and rear-side irradiances were measured in order to integrate bifaciality of the modules into the models. The models showed good performance for non-real-time monitoring, especially under clear skies, and the analytical model was more accurate than the empirical model. The heatmap visualization technique was applied to six months of data in order to investigate the site conditions on the rear side of the modules as well as the accuracy of the models. The heatmap results of the rear- and front-sides irradiances showed that the installation conditions, such as the azimuth angles of the sun and the surrounding obstacles, had a strong impact on the energy received from the back of the modules. The heatmap results of the models validated the performance of the analytical model. The average daily errors for the analytical model were less than 1% and 3% for normal and high albedos, respectively.
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- 2021
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18. Antitumoral Effect of Laurinterol on 3D Culture of Breast Cancer Explants
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Sara García-Davis, Ezequiel Viveros-Valdez, Ana R. Díaz-Marrero, José J. Fernández, Daniel Valencia-Mercado, Olga Esquivel-Hernández, Pilar Carranza-Rosales, Irma Edith Carranza-Torres, and Nancy Elena Guzmán-Delgado
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laurinterol ,Laurencia ,antitumoral ,breast cancer explants ,organotypic culture ,ex vivo ,Biology (General) ,QH301-705.5 - Abstract
Macroalgae represent an important source of bioactive compounds with a wide range of biotechnological applications. Overall, the discovery of effective cytotoxic compounds with pharmaceutical potential is a significant challenge, mostly because they are scarce in nature or their total synthesis is not efficient, while the bioprospecting models currently used do not predict clinical responses. Given this context, we used three-dimensional (3D) cultures of human breast cancer explants to evaluate the antitumoral effect of laurinterol, the major compound of an ethanolic extract of Laurencia johnstonii. To this end, we evaluated the metabolic and histopathological effects of the crude extract of L. johnstonii and laurinterol on Vero and MCF-7 cells, in addition to breast cancer explants. We observed a dose-dependent inhibition of the metabolic activity, as well as morphologic and nuclear changes characteristic of apoptosis. On the other hand, a reduced metabolic viability and marked necrosis areas were observed in breast cancer explants incubated with the crude extract, while explants treated with laurinterol exhibited a heterogeneous response which was associated with the individual response of each human tumor sample. This study supports the cytotoxic and antitumoral effects of laurinterol in in vitro cell cultures and in ex vivo organotypic cultures of human breast cancer explants.
- Published
- 2019
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19. Heredabilidades y tendencias genéticas para características reproductivas en una población de ganado cruzado
- Author
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OSCAR VERGARA G, RAFAEL CARDONA R, DANIEL VALENCIA H, ROBERTO ALMANZA L, and CLARA RUGELES P,
- Subjects
Ganado cruzado ,edad al primer parto ,intervalo entre partos ,efecto racial ,Agriculture ,Agriculture (General) ,S1-972 ,Animal culture ,SF1-1100 - Abstract
El objetivo de este estudio fue estimar parámetros genéticos y tendencias genéticas para edad al primer parto (EPP), primer intervalo entre partos (IEP1), segundo intervalo entre partos (IEP2) y tercer intervalo entre partos (IEP3) entre los años 1999 al 2009 en una población de ganado vacuno cruzado en el municipio de Planeta Rica, Córdoba. Se utilizaron modelos unicaracterísticos que incluyeron el efecto fijo del grupo contemporáneo (año-época-sexo de la cría-número de partos), efectos aleatorios genéticos aditivos directos del animal y residual. La estimación de los componentes de varianza y de efectos genéticos fueron estimados a través del programa AIREMLF90. Las tendencias genéticas se estimaron como regresión del promedio de los valores genéticos de los animales por año sobre el tiempo, mediante el procedimiento Reg de SAS. Las heredabilidades para los efectos genéticos aditivos directos fueron 0.35 ± 0.22 para la EPP, y para IEP1, IEP2 e IEP3 fue de; 0.16 ± 0.03, 0.003 ± 0.046 y 0.006 ± 0.013, respectivamente. Los estimados de heredabilidad sugieren que hay influencia del ambiente sobre las características en estudio y que además se deben mejorar las condiciones de alimentación y manejo de los animales. Las tendencias genéticas estimadas fueron cercanas a cero, lo cual indica que se hace necesario la implementación de un programa de selección para estas características en la población.
- Published
- 2016
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20. La comunicación como proceso de construcción de ciudadanía y de agencia política en los colectivos juveniles
- Author
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Daniel Valencia Nieto
- Subjects
Communication. Mass media ,P87-96 - Abstract
Este artículo se ocupa de describir los hallazgos del proyecto de investigación sobre las prácticas juveniles como expresiones ciudadanas. Desde la relación comunicación/ política, el artículo da cuenta de cómo se pueden identificar los procesos de construcción de la agencia política de los colectivos juveniles. Se ocupa de analizar, a partir de los modelos de organización, de las acciones emprendidas y de las formas de comunicación, cómo los miembros de los grupos juveniles intentan generar un tipo de agencia política para las reivindicaciones sociales que demandan mediante la acción colectiva. Finalmente, el artículo se ocupa de describir cómo, por medio de los procesos de comunicación, se hace visible la amplitud y la diversidad de los ejercicios ciudadanos de los jóvenes. Llama la atención sobre los problemas y dificultades que enfrentan estos grupos en cuanto a su latencia y permanencia en la vida política, a la vez que destaca el potencial formativo de dichas prácticas.
- Published
- 2010
21. La investigación en comunicación en Latinoamérica: 'la mies es mucha; los obreros, pocos'
- Author
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Daniel Valencia Nieto
- Subjects
Communication. Mass media ,P87-96 - Abstract
Por medio de esta entrevista, el presidente de la Asociación Latinoamericana de Investigadores de la Comunicación (alaic) expone cómo ha sido el proceso de la investigación en comunicación a lo largo de las diferentes etapas del desarrollo de los estudios de la comunicación en América Latina. Destaca la importancia que para ese proceso ha significado la interdisciplinariedad y el diálogo con las ciencias sociales. Describe cómo se empiezan a introducir, en la agenda de investigación en comunicación, problemas estructurales de la región: el fortalecimiento de la democracia, los problemas del medio ambiente, la promoción y defensa de los derechos humanos, la apropiación y el uso de las tecnologías de la información y la comunicación (tic), por parte de los diferentes sectores sociales, etc. También llama la atención sobre la necesidad de recuperar el sentido crítico de la epistemología de la comunicación en los programas de formación de posgrados en comunicación.
- Published
- 2010
22. Fomento de la creatividad en los estudiantes del diseño industrial en una universidad privada de la ciudad de Medellín. Promotion of creativity in students of the industrial design at a private University in the city of Medellin.
- Author
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Daniel Valencia Albaran, Olena Klimenko, and Wilson Armando Montaño Pardo
- Subjects
Psychology ,BF1-990 - Abstract
Promotion of creativity in students of the industrial design at a private University in the city of Medellin. Resumen. El artículo presenta resultados de una investigación orientada a indagar por el fomento de la creatividad en estudiantes del diseño industrial en una universidad privada de Medellín, Para este fin se dirigió la atención a los aspectos de las prácticas de enseñanza relevantes para tal fin y las concepciones sobre la creatividad que manejan los docentes. Se utilizo el enfoque mixto, nivel descriptivo y método fenomenológico, la población del estudio estuvo representada por los docentes y estudiantes de un programa de pregrado de diseño industrial en una universidad de carácter privado en la Cuidad de Medellín, tanto la muestra de los docentes como de los estudiantes se escogió por conveniencia. Se aplicó una entrevistas semistructurada y escala Likert diseñadas para el estudio y el test CREA. Los resultados obtenidos muestran un aumento significativo estadísticamente en los puntajes del test CREA obtenidos por los estudiantes desde el primero hasta el décimo semestre, aunque no se puede afirmar que este aumento se debe exclusivamente a los esfuerzos formativos del programa. Igualmente, se observa que las prácticas de enseñanza de los docentes del programa estudiado cuentan con una alta orientación hacia el fomento de la creatividad en sus estudiantes. Lo anterior se corresponde con la importancia que adjudican los docentes entrevistados a la creatividad en la formación profesional de un diseñador industrial. Palabras clave: creatividad, diseño industrial, prácticas de enseñanza, concepciones de los docentes. Abstract The article presents results of a research aimed to explore the promotion of creativity in students from the industrial design in one private University of Medellín, to this end turned attention to aspects of teaching practices and the teacher´s conceptions about creativity. The study used the mixed approach, descriptive level and phenomenological method, the study population was represented by teachers and students in an undergraduate program of industrial design in one private university of Medellín, both the sample of teachers as was used student was chosen for convenience. It was applied the interviews and Likert scale designed to study and test CREA. The results show a statistically significant increase in test scores obtained by students from the first to the tenth semester, but can not claim that this increase is due exclusively to the training program efforts. Also, it is observed that the teaching practices of teachers in the program have a high orientation fostering creativity in their students. This corresponds to the importance they attach to the teachers interviewed for creativity in the training of an industrial designer. Keywords: creativity, industrial design, teaching practice, teacher´s conceptions.
- Published
- 2015
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23. Artista invitado: Daniel Valencia Albaran
- Author
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Daniel Valencia Albaran
- Subjects
Periodista frustrado ,Vivencias inventadas ,Cosas ficticias ,Isaías ,Psychology ,BF1-990 - Abstract
Daniel Valencia es un joven paisa de 25 años, diseñador industrial, amante del diseño, el cine y la música, creador de un personaje, Isaías Buenahora, con el cual ilustra situaciones, películas, personas, características, momentos...creando de la vida una película, donde todo es posible, todo es lento o rápido, lleno de acción o drama, incluso de fantasía. Isaías nace como un periodista frustrado, sin trabajo sin creatividad, fracasado, fumador, y, a medida que pasa el tiempo, el personaje evoluciona hasta convertirse en un alter ego, mostrando etapas de su creador, vivencias inventadas, propias o surreales. Isaías es, entonces, un medio para transformar cosas ficticias en una realidad o viceversa...
- Published
- 2014
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24. Efficient in Vivo Neural Signal Compression Using an Autoencoder-Based Neural Network.
- Author
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Daniel Valencia, Patrick P. Mercier, and Amir Alimohammad 0001
- Published
- 2024
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25. Electronic transmission in Graphene suppressed by interlayer interference
- Author
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Daniel Valencia, Jun-Qiang Lu, Jian Wu, Feng Liu, Feng Zhai, and Yong-Jin Jiang
- Subjects
Physics ,QC1-999 - Abstract
We investigate electronic transport property of a graphene monolayer covered by a graphene nanoribbon. We demonstrate that electronic transmission of a monolayer can be reduced when covered by a nanoribbon. The energy at which the transmission reduction occurs depends on the width of nanoribbon. We explain the transmission reduction as interference between wavefunctions in the monolayer and the nanoribbon. Furthermore, we show that the transmission reduction of a monolayer is combinable when covered by more than one nanoribbon and we propose a concept of “combination of control” for possible nano-application designs.
- Published
- 2013
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26. A generalized hardware architecture for real-time spiking neural networks.
- Author
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Daniel Valencia and Amirhossein Alimohammad 0001
- Published
- 2023
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27. Multi-camera Metrology System for Shape and Position Correction of Large Fuselage Components in Aircraft Assembly.
- Author
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Daniel Valencia, Jörg Wollnack, Sanjay Kamath, and Leander Brieskorn
- Published
- 2022
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28. Calibration of Laser Optics for Sensor Guided Remote Cutting.
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Daniel Valencia, Benjamin Schulze, Christian Möller, and Jörg Wollnack
- Published
- 2020
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29. Las contribuciones arqueológicas en la formación de la historia colonial: Memorias del Primer Coloquio de arqueología histórica
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Aban Flores, Alejandra González, América Malbrán, Arnulfo Allende, Braulio Pérez, César A Quijada, Claudia Sabag, Cristina Ratto, Daniel Valencia, Dinna M Esparza Eduardo, Enrique Méndez, Enrique Tovar, Francisco A Osorio, Georgina Ibarra, Gerardo Navarro, Ivonne Reyes, José J Cabrera, Juan J Guerre
- Published
- 2022
30. An Artificial Neural Network Processor With a Custom Instruction Set Architecture for Embedded Applications.
- Author
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Daniel Valencia, Saeed Fouladi Fard, and Amirhossein Alimohammad 0001
- Published
- 2020
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31. A comparison between GeneXpert testing and the Berlin-Charité diagnostic protocol for the detection of SARS-CoV-2 in a cohort of Mexican patients.
- Author
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Vargas, Eduardo Becerril, primary, Cueva, Andrea Delgado, additional, Konigsberg, Gabriel Cojuc, additional, Razon, Gaston Becherano, additional, Garcia, Yessica Velasco, additional, orozco, José Martinez, additional, Tinajero, Angel Sanchez, additional, Santillán, Danna Patricia Ruiz, additional, Vilar-Compte, Diana, additional, Martinez, Daniel de la Rosa, additional, Juarez, Etzael Antonio, additional, Sanchez, Victor Rodriguez, additional, Trujillo, Daniel Valencia, additional, Colin, Maria Garcia, additional, Sanchez, Mario Mujica, additional, Davalos, Christian Mireles, additional, and Molina, Yamil Monitel, additional
- Published
- 2024
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32. Performance of a large size photovoltaic module for façade integration
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Ya Brigitte Assoa, Daniel Valencia-Caballero, Elena Rico, Teodosio Del Caño, and Joao Victor Furtado
- Subjects
Renewable Energy, Sustainability and the Environment - Published
- 2023
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33. Frameworks for Efficient Brain-Computer Interfacing.
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Daniel Valencia, Jameson Thies, and Amirhossein Alimohammad 0001
- Published
- 2019
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34. A Real-Time Spike Sorting System Using Parallel OSort Clustering.
- Author
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Daniel Valencia and Amirhossein Alimohammad 0001
- Published
- 2019
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35. An Efficient Hardware Architecture for Template Matching-Based Spike Sorting.
- Author
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Daniel Valencia and Amirhossein Alimohammad 0001
- Published
- 2019
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36. Compact and high-throughput parameterisable architectures for memory-based FFT algorithms.
- Author
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Daniel Valencia and Amirhossein Alimohammad 0001
- Published
- 2019
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37. High-throughput and compact reconfigurable architectures for recursive filters.
- Author
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Vaishali Shinde, Ganesh Jai Kumar, Daniel Valencia, and Amirhossein Alimohammad 0001
- Published
- 2018
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38. High-throughput and compact FFT architectures using the Good-Thomas and Winograd algorithms.
- Author
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Nikhilesh Bhagat, Daniel Valencia, Amirhossein Alimohammad 0001, and Fred Harris 0001
- Published
- 2018
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39. Partially binarized neural networks for efficient spike sorting
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Daniel Valencia and Amir Alimohammad
- Subjects
Biomedical Engineering - Published
- 2022
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40. Factores socioeconómicos explicativos en la decisión de reforestar: experiencia en poblaciones de La Sepultura, Chiapas
- Author
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Juan Carlos Caballero Salinas, Leonardo Daniel Valencia López, Vicente Javier Aguirre Moreno, and Hugo Adrián Pizaña Vidal
- Abstract
Este artículo tiene el objetivo de examinar los factores socioeconómicos que incidieron en los habitantes de un área natural protegida en Chiapas, México, para que adoptaran prácticas de reforestación en el marco de un proyecto interinstitucional que impulsó la restauración de sus predios forestales afectados por el huracán Bárbara en el año 2013. Con la información recopilada en el trabajo de campo entre 2014 y 2016, a través de observación directa y datos de 51 encuestas, se realizó un análisis cualitativo y estadístico con el apoyo de un modelo Logit. Los resultados muestran que la disposición de las personas a reforestar disminuye a medida que la ganadería representa su principal ocupación. Además, se revela que la población más proclive a reforestar es aquella que tiene mayor participación en actividades forestales, que es motivada por factores intrínsecos y reside de manera permanente en el lugar. Se concluye que los aspectos socioeconómicos ligados a las actividades productivas locales son factores que inciden en la decisión a reforestar.
- Published
- 2022
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41. Contribution to the knowledge of non-native fishes in reservoirs in the Magdalena River basin: the study case Piedras blancas reservoir
- Author
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Daniel Restrepo Santamaria, Daniel Valencia-Rodríguez, Juliana Herrera-Pérez, Sebastián Muñoz-Duque, Andrés Felipe Galeano, and Luz Jiménez-Segura
- Subjects
Global and Planetary Change ,Ecology ,Ecology, Evolution, Behavior and Systematics - Abstract
The habitat fragmentation caused by reservoir construction in different aquatic systems in the Magdalena River basin is a latent threat to the diversity of fishes and aquatic environments in the Andean region of Colombia. Contributing to the knowledge about how fish assemblages are formed in these scenarios is fundamental for the management and decision-making on the aquatic resources of the basin. In this communication, we describe the results of a fish characterization in the area of influence of the Piedras Blancas reservoir, a high Andean reservoir built for hydroelectric power generation. Only three species of fish that make up the evaluated assemblage were captured, and two of them, Cyprinus carpio and Xiphophorus maculatus, are not native to the basin. Possibly, with a greater sampling effort, more species can be found. The native species Hemibrycon sp. is distributed mainly in a creek, while in the reservoir, the introduced species dominate. The environmental variables were in optimal ranges for the development of life in the evaluated environments. It is important to advance the knowledge about the distribution of the introduced and native species in the basin to generate recommendations that contribute to the management of these species in the aquatic systems of Colombian Andes.
- Published
- 2022
- Full Text
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42. Ensamblajes de peces en embalses altoandinos: El caso de los embalses Quebradona y Riogrande II en la cuenca Magdalena
- Author
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Lina María Martínez-Toro, Daniel Restrepo-Santamaría, Daniel Valencia-Rodríguez, and Luz Fernanda Jiménez-Segura
- Subjects
General Agricultural and Biological Sciences - Abstract
El desarrollo de producción hidro-energética al norte de los Andes de Sudamérica se ha centrado en la cuenca Magdalena. Para esta cuenca se reporta que el 68 % de las especies de peces son endémicas y no se han estudiado los efectos que producen estas estructuras sobre sus ensamblajes en los ríos de alta montaña. Este trabajo responde preguntas asociadas a las características que describen el ensamblaje de peces y la influencia que ejercen algunas variables ambientales sobre su distribución en el transcurso de los periodos hidrológicos de sequía y lluvias en el área de influencia de dos embalses. Se capturaron siete especies de peces, cuatro de ellas no nativas de la cuenca. No se encontraron diferencias significativas de las abundancias entre los sistemas acuáticos y entre la temporalidad climática. La riqueza fue mayor en las quebradas y ríos. Los ensamblajes cambiaron según el sistema acuático, en embalses dominaron las especies no nativas Micropterus salmoides y Cyprinus carpio mientras que en las quebradas y ríos el ensamblaje estuvo conformado principalmente por Hemibrycon caucanus y Trichomycterus sp. Los ensamblajes no presentaron diferencias estadísticas entre periodos climáticos. Por otra parte, observamos que variables fisicoquímicas como el oxígeno y la transparencia, son importantes para la distribución de las especies no nativas en los embalses, y para las especies que se distribuyen en ríos y quebradas, la conductividad fue la variable más influyente. La información proporcionada en este estudio servirá de base para la gestión de la conservación de peces en los Andes.
- Published
- 2022
- Full Text
- View/download PDF
43. Monitoring the fabric of nature: using allometric trophic network models and observations to assess policy effects on biodiversity
- Author
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Sergio A. Navarrete, M. Isidora Ávila-Thieme, Daniel Valencia, Alexandre Génin, Stefan Gelcich, Spatial Ecology and Global Change, and Environmental Sciences
- Subjects
non-compliance ,illegal fishing ,species interactions ,ecosystem-based management ,Agricultural and Biological Sciences(all) ,Biochemistry, Genetics and Molecular Biology(all) ,biodiversity monitoring ,kelp forests ,General Agricultural and Biological Sciences ,General Biochemistry, Genetics and Molecular Biology - Abstract
Species diversity underpins all ecosystem services that support life. Despite this recognition and the great advances in detecting biodiversity, exactly how many and which species co-occur and interact, directly or indirectly in any ecosystem is unknown. Biodiversity accounts are incomplete; taxonomically, size, habitat, mobility or rarity biased. In the ocean, the provisioning of fish, invertebrates and algae is a fundamental ecosystem service. This extracted biomass depends on a myriad of microscopic and macroscopic organisms that make up the fabric of nature and which are affected by management actions. Monitoring them all and attributing changes to management policies is daunting. Here we propose that dynamic quantitative models of species interactions can be used to link management policy and compliance with complex ecological networks. This allows managers to qualitatively identify ‘interaction-indicator’ species, which are highly impacted by management policies through propagation of complex ecological interactions. We ground the approach in intertidal kelp harvesting in Chile and fishers' compliance with policies. Results allow us to identify sets of species that respond to management policy and/or compliance, but which are often not included in standardized monitoring. The proposed approach aids in the design of biodiversity programmes that attempt to connect management with biodiversity change. This article is part of the theme issue ‘Detecting and attributing the causes of biodiversity change: needs, gaps and solutions’.
- Published
- 2023
- Full Text
- View/download PDF
44. Two-trace two-dimensional correlation spectra (2T2D-COS) analysis using FTIR spectra to monitor the immune response by COVID-19
- Author
-
Sivakumaran Karthikeyan, Gustavo Jesus Vazquez-Zapien, Adriana Martinez-Cuazitl, Raul Jacobo Delgado-Macuil, Daniel Enrique Rivera-Alatorre, Francisco Garibay-Gonzalez, Josemaria Delgado-Gonzalez, Daniel Valencia-Trujillo, Melissa Guerrero-Ruiz, Consuelo Atriano-Colorado, Alberto Lopez-Reyes, Dante J. Lopez-Mezquita, and Monica Maribel Mata-Miranda
- Abstract
There is a growing trend in using saliva for SARS-CoV-2 detection with reasonable accuracy. We have studied the responses of IgA, IgG, and IgM in human saliva by directly comparing disease with control analyzing two-trace two-dimensional correlation spectra (2T2D-COS) employing Fourier transform infrared (FTIR) spectra. The findings show the decrease of IgG and IgM salivary antibodies in the 50, 60, 65, and 75-years samples. Among the various COVID-19 populations studied, the female 30 years group reveal defence mechanisms exhibited by IgM and IgA. Lipids and fatty acids decrease, resulting in lipid oxidation due to the SARS-CoV-2 in the samples studied. Study shows salivary thiocyanate plays defence against SARS-CoV-2 in male population in 25 and 35 age groups. The receiver operation characteristics statistical method shows a sensitivity of 98% and specificity 94% for the samples studied. The measure of accuracy computed as F1 score and G score has a high value which supports the validation of our study. The 2T2D-COS analysis has the potential to monitor the progression of immunoglobulin’s response function of COVID-19 with good accuracy, which could help in diagnosing clinical trials.
- Published
- 2023
- Full Text
- View/download PDF
45. Patrones y factores impulsores de cambios en la calidad del agua asociados a embalses en los Andes tropicales
- Author
-
Robert Scott Winton, Silvia López-Casas, Daniel Valencia-Rodríguez, Camilo Bernal-Forero, Juliana Delgado, Bernhard Wehrli, and Luz Jiménez-Segura
- Abstract
Los Andes tropicales son una zona de alta biodiversidad, que constantemente se enfrenta a la presión del desarrollo hidroeléctrico. Sin embargo, los efectos de los embalses en los ecosistemas fluviales de la regióninfluenciados por cambios fisicoquímicos en la calidad del agua son poco conocidos. Colombia es el único país en América del Sur que gestiona bases de datos ambientales públicos y centralizados, allí se incluyen conjuntos de datos sobre la calidad de aguas superficiales asociados a la vigilancia medioambiental de las represas. Para evaluar las relaciones entre las condiciones de los ríos en Colombia con relación a las centrales hidroeléctricas, analizamos los datos de monitoreo asociados con 15 represas, enfocándonos en la disponibilidad de oxígeno, el régimen térmico y la pérdida de sedimentos; ya que estas propiedades están influenciadas directamente por la construcción de represas en los ríos, e imponen restricciones fundamentales en la estructura de los ecosistemas acuáticos aguas abajo de la presa. Encontramos que en la mayoría de los embalses en Colombia (7 de 10) se reducen estacionalmente grandes porcentajes de las concentraciones de sólidos suspendidos totales (50-99%) debido a la captura de sedimentos. Adicionalmente, la mayoría de los embalses (8 de 15), a través de la descarga de aguas superficiales a mayor temperatura, aumentan estacionalmente las temperaturas del río (entre 2 y 4 °C) con respecto a las condiciones aguas arriba. Un subconjunto de cuatro represas genera hipoxia aguas abajo (
- Published
- 2023
- Full Text
- View/download PDF
46. Trophic niche partitioning among non-native fish species coexisting in a high Andean reservoir
- Author
-
Juan David Nieto, Lina María Martínez Toro, Juan Sebastián Ospina, Daniel Valencia-Rodríguez, Daniel Restrepo-Santamaria, and Luz Fernanda Jiménez
- Abstract
The arrival of a non-native species to a new environment threatens local biological diversity, causing instability in the functioning of the ecosystem. The adverse ecological effects caused by these species have been scarcely documented for the Magdalena basin. By studying predator-prey interactions, we characterized the trophic niche of three non-native species (Micropterus salmoides, Oncorhynchus mykiss, and Cyprinus carpio) that dominate a high Andean reservoir in the Magdalena basin. To understand whether non-native species are preying on native fish, or if they present specific feeding behaviors that facilitate their establishment in lentic environments, we evaluated the diversity of the prey they consume, their feeding strategy, and possible differences in the feeding scheme. Forty individuals were analyzed, and twenty categories of prey were identified for these species. The consumed prey corresponds to the native biota; however, no native fish were found in the stomach contents evaluated. The diversity of prey consumed is similar amongst species, however, M. salmoides behaves like an important predator, as it consumes a larger amount of prey. We observed that the variation in diet composition amongst the non-native species is different, which favors their coexistence as it reduces the competition amongst them. Analyzing the type of diet of this non-native fish is a useful tool that provides a description of some trophic interactions in this aquatic environment. Our results contribute information on the existing interactions amongst non-native species to the Magdalena basin, which is important for the development of strategies to manage and promote impact mitigation.
- Published
- 2023
- Full Text
- View/download PDF
47. ENDOPARASITISM AND FIBROSIS IN Crotalus totonacus (VIPERIDAE) FROM SIERRA GORDA DE QUERÉTARO, MEXICO
- Author
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Mauricio Tepos Ramírez, David Iván Hernández Mena, Omar Lagunas, Valeria Ugalde Sánchez, Ricardo-Daniel Valencia-García, and Norma Hernández-Camacho
- Subjects
Animal Science and Zoology ,Ecology, Evolution, Behavior and Systematics - Abstract
Despite the fact that some parasitological reviews have recently been made in some groups of reptiles, such as snakes and lizards, the current knowledge about the parasitofauna and associated pathologies in reptiles is incomplete and scarce. Therefore, here we present the first record for the state of Querétaro, Mexico of the pentastomid Porocephalus crotali and the first record of the nematode Kalicephalus inermis parasitizing a specimen of Crotalus totonacus, as well as the first record of a fibroma in the mesentery.
- Published
- 2022
- Full Text
- View/download PDF
48. Towards in vivo neural decoding
- Author
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Daniel Valencia and Amir Alimohammad
- Subjects
Biomedical Engineering ,Original Article - Abstract
Conventional spike sorting and motor intention decoding algorithms are mostly implemented on an external computing device, such as a personal computer. The innovation of high-resolution and high-density electrodes to record the brain’s activity at the single neuron level may eliminate the need for spike sorting altogether while potentially enabling in vivo neural decoding. This article explores the feasibility and efficient realization of in vivo decoding, with and without spike sorting. The efficiency of neural network-based models for reliable motor decoding is presented and the performance of candidate neural decoding schemes on sorted single-unit activity and unsorted multi-unit activity are evaluated. A programmable processor with a custom instruction set architecture, for the first time to the best of our knowledge, is designed and implemented for executing neural network operations in a standard 180-nm CMOS process. The processor’s layout is estimated to occupy 49 mm[Formula: see text] of silicon area and to dissipate 12 mW of power from a 1.8 V supply, which is within the tissue-safe operation of the brain.
- Published
- 2022
- Full Text
- View/download PDF
49. Length–weight relationships of 31 selected fish species from the Magdalena River basin, Colombia
- Author
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Silvia López-Casas, Juliana Herrera-Pérez, Daniel Valencia-Rodríguez, Luz F. Jiménez-Segura, Juan Guillermo Ospina-Pabón, Daniel Restrepo-Santamaría, and Juan P. Londoño-Velasquez
- Subjects
Fishery ,geography ,geography.geographical_feature_category ,Length weight ,Drainage basin ,Fish species ,Aquatic Science ,Biology - Published
- 2021
- Full Text
- View/download PDF
50. Panorama actual del bitcóin. Una descripción práctica y jurídica de las criptomonedas en Colombia y Ecuador
- Author
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Franco Daniel Valencia Marín
- Subjects
blockchain ,ecuador ,criptomonedas ,Persona ,K1-7720 ,bitcóin ,regulación ,criptoactivo ,Law in general. Comparative and uniform law. Jurisprudence ,Political science ,colombia ,Humanities ,descentralización ,Law - Abstract
espanolEl bitcoin es una tecnologia originada en el ano 2009 que pretende implementar un sistema de pagos descentralizado entre personas. El presente trabajo se realiza con el fin de dar a conocer dicha tecnologia, la cual denota importancia debido a las funcionalidades y oportunidades que ofrece para todo tipo de individuos, desde aquellos que buscan un refugio de valor para su patrimonio, hasta los que desean invertir su dinero o simplemente entender su funcionamiento y utilizarla en el dia a dia. Este escrito expone los origenes del bitcoin, asi como sus principales caracteristi-cas y funcionamiento. Ademas, analiza sus ventajas y desventajas desde un punto de vista practico y hace un enfasis especial en la regulacion juridica existente alrededor de las criptomonedas en Colombia y Ecuador. A traves de una metodologia descriptiva y utilizando herramientas cualitativas y cuantitativas, se logro determinar un crecimiento progresivo del bitcoin durante los ultimos anos, no solo en terminos de valor, sino tambien de adopcion y de seguridad. Por este motivo, tanto Colombia como Ecuador deben adaptar sus re-gulaciones juridicas, con el fin de estar a la altura de la era digital en la que nos encontramos y aprovechar con ello los beneficios de este fenomeno en lugar de impedir su desarrollo. EnglishBitcoin is a technology originated in 2009 that aims to implement a decentralized payment system between people. The present work is carried out in order to pu-blicize this technology, which denotes importance due to the functionalities and opportunities it offers for all types of individuals, from those who seek a refuge of value for their assets, to those who wish to invest your money or simply unders-tand how it works and use it on a day-to-day basis.This writing exposes the origins of Bitcoin, as well as its main characteristics and operation. In addition, it analyzes its advantages and disadvantages from a prac-tical point of view and places special emphasis on the existing legal regulation around cryptocurrencies in Colombia and Ecuador.Through a descriptive methodology and using qualitative and quantitative tools, it was possible to determine a progressive growth of Bitcoin in recent years, not only in terms of value, but also of adoption and security. For this reason, both Co-lombia and Ecuador must adapt their legal regulations, in order to live up to the digital age in which we find ourselves and thereby take advantage of the benefits of this phenomenon instead of preventing its development.
- Published
- 2021
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