25 results on '"Nicolas Giraldo"'
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2. Large Scale SARS-CoV-2 Molecular Testing and Genomic Surveillance Reveal Prolonged Infections, Protracted RNA shedding, and Viral Reinfections
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C. Paul Morris, Chun Huai Luo, Jaiprasath Sachithanandham, Maggie Li, Matthew Schwartz, David C. Gaston, Victoria Gniazdowski, Nicolas Giraldo-Castillo, Adannaya Amadi, Julie M. Norton, William F. Wright, Eili Y. Klein, Andrew Pekosz, and Heba H. Mostafa
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SARS-CoV-2 ,variants ,prolonged infection ,prolonged shedding ,reinfection ,Microbiology ,QR1-502 - Abstract
Large-scale SARS-CoV-2 molecular testing coupled with whole genome sequencing in the diagnostic laboratories is instrumental for real-time genomic surveillance. The extensive genomic, laboratory, and clinical data provide a valuable resource for understanding cases of reinfection versus prolonged RNA shedding and protracted infections. In this study, data from a total of 22,292 clinical specimens, positive by SARS-CoV-2 molecular diagnosis at Johns Hopkins clinical virology laboratory between March 11th 2020 to September 23rd 2021, were used to identify patients with two or more positive results. A total of 3,650 samples collected from 1,529 patients who had between 2 and 20 positive results were identified in a time frame that extended up to 403 days from the first positive. Cycle threshold values (Ct) were available for 1,622 samples, the median of which was over 30 by 11 days after the first positive. Extended recovery of infectious virus on cell culture was notable for up to 70 days after the first positive in immunocompromised patients. Whole genome sequencing data generated as a part of our SARS-CoV-2 genomic surveillance was available for 1,027 samples from patients that had multiple positive tests. Positive samples collected more than 10 days after initial positive with high quality sequences (coverage >90% and mean depth >100), were more likely to be from unvaccinated, or immunosuppressed patients. Reinfections with viral variants of concern were found in 3 patients more than 130 days from prior infections with a different viral clade. In 75 patients that had 2 or more high quality sequences, the acquisition of more substitutions or deletions was associated with lack of vaccination and longer time between the recovered viruses. Our study highlights the value of integrating genomic, laboratory, and clinical data for understanding the biology of SARS-CoV-2 as well as for setting a precedent for future epidemics and pandemics.
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- 2022
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3. Correction to: 33rd Annual Meeting & Pre-Conference Programs of the Society for Immunotherapy of Cancer (SITC 2018)
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Sneha Berry, Nicolas Giraldo, Peter Nguyen, Benjamin Green, Haiying Xu, Aleksandra Ogurtsova, Abha Soni, Farah Succaria, Daphne Wang, Charles Roberts, Julie Stein, Elizabeth Engle, Drew Pardoll, Robert Anders, Tricia Cottrell, Janis M. Taube, Ben Tran, Mark Voskoboynik, James Kuo, Yung-Lue Bang, Hyun-Cheo Chung, Myung-Ju Ahn, Sang-We Kim, Ayesh Perera, Daniel Freeman, Ikbel Achour, Raffaella Faggioni, Feng Xiao, Charles Ferte, Charlotte Lemech, Funda Meric-Bernstam, Theresa Werner, Stephen Hodi, Wells Messersmith, Nancy Lewis, Craig Talluto, Mirek Dostalek, Aiyang Tao, Sarah McWhirter, Damian Trujillo, Jason Luke, Chunxiao Xu, BoMarelli, Jin Qi, Guozhong Qin, Huakui Yu, Molly Jenkins, Kin-Ming Lo, Joern-Peter Halle, Yan Lan, Matthew Taylor, Nicholas Vogelzang, Allen Cohn, Daniel Stepan, Robert Shumaker, Corina Dutcus, Matthew Guo, Emmett Schmidt, Drew Rasco, Marcia Brose, Christopher Di Simone, Sharad Jain, Donald Richards, Carlos Encarnacion, James Mier, Jeongshin An, Yeun-yeoul Yang, Won-Hee Lee, Jinho Yang, Jong-kyu Kim, Hyun Goo Kim, Se Hyun Paek, Jun Woo Lee, Joohyun Woo, Jong Bin Kim, Hyungju Kwon, Woosung Lim, Nam Sun Paik, Yoon-Keun Kim, Byung-In Moon, Filip Janku, David Tan, Juan Martin-Liberal, Shunji Takahashi, Ravit Geva, Ayca Gucalp, Xueying Chen, Kulandayan Subramanian, Jennifer Mataraza, Jennifer Wheler, and Philippe Bedard
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Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,RC254-282 - Abstract
After publication of this supplement [1, 2], it was brought to our attention that due to an error authors were missing in the following abstracts. This has now been included in this correction.
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- 2019
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4. CO2 Absorbing Capacity of MEA
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José I. Huertas, Martin D. Gomez, Nicolas Giraldo, and Jessica Garzón
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Chemistry ,QD1-999 - Abstract
We describe the use of a gas bubbler apparatus in which the gas phase is bubbled into a fixed amount of absorbent under standard conditions as a uniform procedure for determining the absorption capacity of solvents. The method was systematically applied to determine the CO2 absorbing capacity of MEA (Ac) at several aqueous MEA (β) and gas-phase CO2 concentrations. Ac approached the nominal CO2 absorbing capacity of MEA (720 g CO2/kg MEA) at very low β levels, increasing from 447.9±18.1 to 581.3±32.3 g CO2/kg MEA as β was reduced from 30 to 2.5% (w/w). Ac did not depend on the CO2 concentration in the inlet gas stream as long as the gas stream did not include other amine sensitive components. During the bubbling tests the outlet CO2 concentration profiles exhibited a sigmoidal shape that could be described by an exponential equation characterized by an efficiency factor (a) and a form factor (n). Statistical analysis based on correlation analysis indicated that in all cases the experimental data fit the equation well when a was 6.1±0.35 and n was 2.5±0.12. The results of these experiments may be used to optimize scrubber designs for CO2 sequestration from fossil fuel derived flue gases.
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- 2015
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5. Mass Transfer in Chemical Engeering Processes - Chapter 7 - Removal of H2S and CO2 from Biogas by Amine Absorption
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Nicolas Giraldo Peralta
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Engineering (General). Civil engineering (General) ,TA1-2040 - Published
- 2013
6. Producción científica sobre la herpetología en Colombia : perspectivas desde los temas de investigación hacia la conservación biológica
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Urbina-Cardona, Nicolás, Acosta, Liliana Saboyá, Camacho-Rozo, Claudia P., Peña, Augusto Rafael Acosta, Arenas-Rodríguez, Angélica, Albarracín-Caro, Juan Felipe, Moreno-Cabal, Ana María, Novoa-Salamanca, Natalia María, Camacho-Durán, María Jose, Echeverry, Nicolás Giraldo, Hernández-Gallego, María José, López, Laura Pirateque, Varón, Valentina Aldana, Pareja, Daniela Echeverry, and Zabala-Forero, Fabio Andrés
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- 2023
7. Supplemental Table 4-6 from Molecular Subtypes of Clear Cell Renal Cell Carcinoma Are Associated with Sunitinib Response in the Metastatic Setting
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Jessica Zucman-Rossi, Stéphane Oudard, Aurélien de Reyniès, Catherine Sautès-Fridman, Wolf Herman Fridman, Arnaud Méjean, Jean-Jacques Patard, Corinne Teghom, Reza Elaidi, Mathilde Sibony, Vincent Molinié, Nathalie Rioux-Leclercq, Nicolas Giraldo, Gabrielle Couchy, Virginie Verkarre, Alexandra Karadimou, Etienne Becht, Sylvie Job, and Benoit Beuselinck
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Supplemental Table 4-6. Table S4: Detail for each sample of the PBRM1 and VHL-mutation status. NA stands for Not Available. Table S5: For each data type, clinical, transcriptome, methylome or SNP array, sensitity and specificity of the two predictors: PD vs (PR+SD) and PR vs (PD+SD) in the training and validation sets. The 'N()' columns indicate the numbers of each responder type. Table S6: List of the 27 genes firstly used by the classifier to predict the subtypes ccrcc2, ccrcc3 and the joint subtype ccrcc14 and list of the 8 genes used by the second classifier to assign the ccrcc14 samples to the two subtypes ccrcc1 and ccrcc4.
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- 2023
8. Supplemental Figure 7-10 from Molecular Subtypes of Clear Cell Renal Cell Carcinoma Are Associated with Sunitinib Response in the Metastatic Setting
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Jessica Zucman-Rossi, Stéphane Oudard, Aurélien de Reyniès, Catherine Sautès-Fridman, Wolf Herman Fridman, Arnaud Méjean, Jean-Jacques Patard, Corinne Teghom, Reza Elaidi, Mathilde Sibony, Vincent Molinié, Nathalie Rioux-Leclercq, Nicolas Giraldo, Gabrielle Couchy, Virginie Verkarre, Alexandra Karadimou, Etienne Becht, Sylvie Job, and Benoit Beuselinck
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Supplemental Figure 7-10. Figure S7: Summary of the results obtained on the TCGA data; Figure S8: Survival analysis of the patients included in the TCGA according to our classification ccrcc 1 to 4; Figure S9: Illustration of the gradient assumption defined by subtype order
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- 2023
9. Data from Molecular Subtypes of Clear Cell Renal Cell Carcinoma Are Associated with Sunitinib Response in the Metastatic Setting
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Jessica Zucman-Rossi, Stéphane Oudard, Aurélien de Reyniès, Catherine Sautès-Fridman, Wolf Herman Fridman, Arnaud Méjean, Jean-Jacques Patard, Corinne Teghom, Reza Elaidi, Mathilde Sibony, Vincent Molinié, Nathalie Rioux-Leclercq, Nicolas Giraldo, Gabrielle Couchy, Virginie Verkarre, Alexandra Karadimou, Etienne Becht, Sylvie Job, and Benoit Beuselinck
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Purpose: Selecting patients with metastatic clear-cell renal cell carcinoma (m-ccRCC) who might benefit from treatment with targeted tyrosine kinase inhibitors (TKI) is a challenge. Our aim was to identify molecular markers associated with outcome in patients with m-ccRCC treated with sunitinib.Experimental Design: We performed global transcriptome analyses on 53 primary resected ccRCC tumors from patients who developed metastatic disease and were treated with first-line sunitinib. We also determined chromosome copy-number aberrations, methylation status, and gene mutations in von Hippel–Lindau and PBRM1. Molecular data were analyzed in relation with response rate (RR), progression-free survival (PFS), and overall survival (OS). Validation was performed in 47 additional ccRCC samples treated in first-line metastatic setting with sunitinib.Results: Unsupervised transcriptome analysis identified 4 robust ccRCC subtypes (ccrcc1 to 4) related to previous molecular classifications that were associated with different responses to sunitinib treatment. ccrcc1/ccrcc4 tumors had a lower RR (P = 0.005) and a shorter PFS and OS than ccrcc2/ccrcc3 tumors (P = 0.001 and 0.0003, respectively). These subtypes were the only significant covariate in the multivariate Cox model for PFS and OS (P = 0.017 and 0.006, respectively). ccrcc1/ccrcc4 tumors were characterized by a stem-cell polycomb signature and CpG hypermethylation, whereas ccrcc3 tumors, sensitive to sunitinib, did not exhibit cellular response to hypoxia. Moreover, ccrcc4 tumors exhibited sarcomatoid differentiation with a strong inflammatory, Th1-oriented but suppressive immune microenvironment, with high expression of PDCD1 (PD-1) and its ligands.Conclusions: ccRCC molecular subtypes are predictive of sunitinib response in metastatic patients, and could be used for personalized mRCC treatment with TKIs, demethylating or immunomodulatory drugs. Clin Cancer Res; 21(6); 1329–39. ©2015 AACR.
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- 2023
10. Supplemental Figure 1-3 from Molecular Subtypes of Clear Cell Renal Cell Carcinoma Are Associated with Sunitinib Response in the Metastatic Setting
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Jessica Zucman-Rossi, Stéphane Oudard, Aurélien de Reyniès, Catherine Sautès-Fridman, Wolf Herman Fridman, Arnaud Méjean, Jean-Jacques Patard, Corinne Teghom, Reza Elaidi, Mathilde Sibony, Vincent Molinié, Nathalie Rioux-Leclercq, Nicolas Giraldo, Gabrielle Couchy, Virginie Verkarre, Alexandra Karadimou, Etienne Becht, Sylvie Job, and Benoit Beuselinck
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Supplemental Figure 1-3. Figure S1: Expression of immune modulators among the 4 molecular subgroups and normal Samples; Figure S2: Expression of cell-type specific metagenes among the different subgroups and normal samples; Figure S3: CD8+ cell infiltration according to the molecular ccRCC subtype classification.
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- 2023
11. Supplementary Figure and Table Legends from Molecular Subtypes of Clear Cell Renal Cell Carcinoma Are Associated with Sunitinib Response in the Metastatic Setting
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Jessica Zucman-Rossi, Stéphane Oudard, Aurélien de Reyniès, Catherine Sautès-Fridman, Wolf Herman Fridman, Arnaud Méjean, Jean-Jacques Patard, Corinne Teghom, Reza Elaidi, Mathilde Sibony, Vincent Molinié, Nathalie Rioux-Leclercq, Nicolas Giraldo, Gabrielle Couchy, Virginie Verkarre, Alexandra Karadimou, Etienne Becht, Sylvie Job, and Benoit Beuselinck
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Supplementary Figure and Table Legends. Legends of all supplemental Figures and Tables
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- 2023
12. Supplemental Figure 4-6 from Molecular Subtypes of Clear Cell Renal Cell Carcinoma Are Associated with Sunitinib Response in the Metastatic Setting
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Jessica Zucman-Rossi, Stéphane Oudard, Aurélien de Reyniès, Catherine Sautès-Fridman, Wolf Herman Fridman, Arnaud Méjean, Jean-Jacques Patard, Corinne Teghom, Reza Elaidi, Mathilde Sibony, Vincent Molinié, Nathalie Rioux-Leclercq, Nicolas Giraldo, Gabrielle Couchy, Virginie Verkarre, Alexandra Karadimou, Etienne Becht, Sylvie Job, and Benoit Beuselinck
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Supplemental Figure 4-6. Figure S4: Characterisation of the ccRCC molecular subtypes: methylation status and Benporath polycomb signature; Figure S5: Cytogenetic characterization of the ccRCC molecular subtypes; Figure S6: Characterization of the ccRCC molecular subtypes: Myc methylation and (target) amplification
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- 2023
13. Supplemental Table 7-10 from Molecular Subtypes of Clear Cell Renal Cell Carcinoma Are Associated with Sunitinib Response in the Metastatic Setting
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Jessica Zucman-Rossi, Stéphane Oudard, Aurélien de Reyniès, Catherine Sautès-Fridman, Wolf Herman Fridman, Arnaud Méjean, Jean-Jacques Patard, Corinne Teghom, Reza Elaidi, Mathilde Sibony, Vincent Molinié, Nathalie Rioux-Leclercq, Nicolas Giraldo, Gabrielle Couchy, Virginie Verkarre, Alexandra Karadimou, Etienne Becht, Sylvie Job, and Benoit Beuselinck
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Supplemental Table 7-10. Table S7: Area under the ROC curve or c-index for the predictive and prognostic markers presented in Table 1 and Figures 3A, 3B and 3C. Table S8: P-values of the pathway enrichment analysis for the genes differentially expressed, the genes differentially methylated and the genes differentially methylated and anti-correlated to expression data in the four unsupervised subgroups. Table S9: List of the recurrent chromosomal aberrations characterizing ccrcc4-samples with a sensitivity and a specificity greater than 0.65. Table S10: Correlation of the centroids of our classification in four subtypes with the Brannon classification in three subgroups ccA, ccB and cluster_3 and the subtypes predicted in the TCGA cohort
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- 2023
14. Eco-driving key factors that influence fuel consumption in heavy-truck fleets
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Mario Bernal, José Ignacio Huertas, Christopher Mejía-Argueta, Jenny Díaz-Ramírez, Vivian Rangel, Daniela Flórez-Ceron, Nicolas Giraldo-Peralta, and Operations Planning Acc. & Control
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Truck ,Engineering ,Multivariate statistics ,020209 energy ,Transportation ,02 engineering and technology ,Transport engineering ,Data logger ,Statistical analyses ,Driving errors ,0502 economics and business ,0202 electrical engineering, electronic engineering, information engineering ,Operations management ,Baseline (configuration management) ,General Environmental Science ,Civil and Structural Engineering ,050210 logistics & transportation ,business.industry ,05 social sciences ,Driver behavior ,Training (meteorology) ,Eco-driving training ,Freight transportation ,Fuel consumption ,Fuel efficiency ,Performance indicator ,business - Abstract
This research identifies key variables that influence fuel consumption that might be improved through eco-driving training programs under three circumstances that have been scarcely studied before: (a) heavy- and medium-duty truck fleets, (b) long-distance freight transport, and (c) the Latin American region. Based on statistical analyses that include multivariate regression of operational variables on fuel consumption, the impacts of an eco-driving training campaign were measured by comparing ex ante and ex post data. Operational variables are grouped into driving errors, trip conditions, driver behavior, driver profile, and vehicle attributes. The methodology is applied in a freight fleet with nationwide transport operations located in Colombia, where the steepness of its roads plays an important role in fuel consumption. The fleet, composed of 18 trucks, is equipped with state-of-the-art real-time data logger systems. During four months, 517 trips traveling a total distance of 292,512 km and carrying a total of 10,034 tons were analyzed. The results show a baseline average fuel consumption (FC) of 1.716 liters per ton-100 km. A different logistics performance indicator, which measures FC in liters per ton transported each 100 km, shows an average of 3.115. After the eco-driving campaign, reductions of 6.8% and 5.5% were obtained. Drivers’ experience, driving errors, average speed, and weight-capacity ratio, among others, were found to be highly relevant to FC. In particular, driving errors such as acceleration, braking and speed excesses are the most sensitive to eco-driving training, showing reductions of up to 96% on the average number of events per trip.
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- 2017
15. Aggregated Metrics to Assess Fuel Consumption in Freight Fleets.
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Ramírez, Jenny Díaz, Huertas, José Ignacio, and Peralta, Nicolas Giraldo
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MOTOR vehicle fleets ,KEY performance indicators (Management) ,VEHICLE routing problem ,ENERGY consumption ,DECISION making ,AUTOMOBILE repair - Abstract
Vehicle-Fleet's Managers require to identify relevant aggregate metrics to monitor the performance of their vehicles and drivers. The chosen metric should help in the decision making process of programs relative to the vehicle maintenance, drivers awarding, vehicle routing, fleet renovation, among others. It is well known that fuel consumption is around half of the operative cost of vehicular fleets. However, fuel consumption depends of several factors, such as, vehicle weight, load, route, vehicle technology, road conditions, driving patterns, traffic, among others. Therefore fuel consumption by itself is not an appropriate metric for these purposes. The situation worsen for the case of freight transportation where companies usually have a large diversity of vehicles capacities and technologies and cover many different routes. We hypothesized that fuel consumption, measured as l/km-gross ton, is the metric to follow. To test this hypothesis, a monitoring campaign was developed on a non-homogenous fleet of 50 heavy-duty freight vehicles, with nationwide operation, in a country with large variations in altitude (0-3500 masl), during two months of normal operation. Fuel consumption behavior was analyzed with several options of performance metrics. Results indicated that for cases when vehicles are almost always fully loaded, specific consumption measured in [l/km - curb ton] also works for these purposes. [ABSTRACT FROM AUTHOR]
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- 2019
16. Producción científica sobre la herpetología en Colombia: perspectivas desde los temas de investigación hacia la conservación biológica
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Nicolás Urbina-Cardona, Liliana Saboyá Acosta, Claudia P. Camacho-Rozo, Augusto Rafael Acosta Peña, Angélica Arenas-Rodríguez, Juan Felipe Albarracín-Caro, Ana María Moreno-Cabal, Natalia María Novoa-Salamanca, María Jose Camacho-Durán, Nicolás Giraldo Echeverry, María José Hernández-Gallego, Laura Pirateque López, Valentina Aldana Varón, Daniela Echeverry Pareja, and Fabio Andrés Zabala-Forero
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anfibios ,bibliometría ,conservación biológica ,literatura científica ,reptiles ,Science ,Zoology ,QL1-991 ,Botany ,QK1-989 - Abstract
La herpetología colombiana tiene más de 200 años de investigación, pero hasta el momento no se han sistematizado los documentos que conforman el estado del arte de esta disciplina. A partir de una revi-sión sistemática de literatura entre 1741 y 2020, encontramos 2199 documentos, de los cuales el 70,3 % se ha publicado desde el año 2000. De las 394 revistas científicas, las que han realizado mayores contri-buciones son la Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales, la Revista Caldasia, el Catálogo de Anfibios y Reptiles de Colombia y Zootaxa. La mayoría de las publicaciones contribuyen al conocimiento en historia natural, distribución geográfica, sistemática y taxonomía, princi-palmente en Anura y Squamata. Son necesarios más estudios en ecología y conservación de grupos como las cecilias y las salamandras. Resaltamos la necesidad de fortalecer los listados taxonómicos locales con análisis cuantitativos de ecología de comunidades, y los estudios de conservación con estudios pobla-cionales a largo plazo. Es urgente recopilar datos de distribución geográfica para proyectar modelos que evalúen periódicamente el riesgo de extinción de las especies, determinar su representatividad en áreas protegidas y priorizar redes de áreas de conservación. Se requiere incrementar estudios en etnobiología y educación ambiental para cambiar las percepciones negativas de las personas hacia la herpetofauna y generar apropiación en las comunidades locales mediante iniciativas de conservación del hábitat. Así mismo es esencial consolidar investigación sobre los sistemas de gobernanza para generar una apropiación del conocimiento científico dentro de los procesos de toma de decisiones.
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- 2022
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17. IL-36γ promotes a local immune response via the formation of tertiary lymphoid structures in colorectal carcinoma
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Aliyah M. Weinstein, Lu Chen, Nicolas Giraldo, Florent Petitprez, Laetitia Lacroix, Emily A. Brzana, Wolf H. Fridman, Catherine Sautes-Fridman, and Walter J. Storkus
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Immunology ,Immunology and Allergy - Abstract
Tertiary lymphoid structures (TLS) form at sites of chronic inflammation, and locally prime the immune system independently of secondary lymphoid organs. The intratumoral presence of TLS has been associated with a positive prognostic outcome for patients with solid tumors, including colorectal carcinoma. Thus, the therapeutic induction of TLS would be hypothesized to confer clinical benefit to patients. Indeed, the therapeutic introduction of the IL-1 family cytokine IL-36 gamma into the tumor microenvironment (TME) of murine MC38 colon carcinoma leads to delayed tumor progression and the development of TLS at 5 days post-treatment. The TLS present with characteristics of secondary lymphoid organs, including PNAd+ high endothelial venules (HEV) surrounded by CD3+ T cells and CD11c+ dendritic cells, but are considered as “non-classical” due to the absence of a defined B cell zone. The formation of TLS is dependent upon the adaptive immune response, as IL-36 gamma-treated tumors grown in Rag2−/− animals fail to present with PNAd+ vasculature within the tumor. Thus, crosstalk between the immune system and cells of the vasculature is key to the efficacy of the IL-36 gamma-induced anti-tumor immune response. In human colorectal carcinoma, IL-36 gamma was also observed to promote the local anti-tumor immune response. Expression of IL-36 gamma by vascular endothelial cells of HEV was associated with an increased density of CD20+ B cells in TLS. Specific IL-36 gamma production by CD68+ macrophages was associated with an increased infiltration of CD4+ central memory T cells into the TME. Therefore, IL-36 gamma is a pro-inflammatory mediator involved in the anti-tumor immune response in both murine and human colorectal cancer.
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- 2018
18. CO2 absorbing capacity of MEA
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Martin D. Gomez, Jessica P. Garzón, Nicolas Giraldo, and José Ignacio Huertas
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Flue gas ,Aqueous solution ,Chromatography ,Article Subject ,Chemistry ,business.industry ,Fossil fuel ,Analytical chemistry ,Scrubber ,General Chemistry ,Gas bubbler ,Exponential function ,lcsh:Chemistry ,Efficiency factor ,lcsh:QD1-999 ,7 INGENIERÍA Y TECNOLOGÍA ,Amine gas treating ,business - Abstract
We describe the use of a gas bubbler apparatus in which the gas phase is bubbled into a fixed amount of absorbent under standard conditions as a uniform procedure for determining the absorption capacity of solvents. The method was systematically applied to determine the CO2absorbing capacity of MEA (Ac) at several aqueous MEA (β) and gas-phase CO2concentrations.Acapproached the nominal CO2absorbing capacity of MEA (720 g CO2/kg MEA) at very lowβlevels, increasing from447.9±18.1to581.3±32.3 g CO2/kg MEA asβwas reduced from 30 to 2.5% (w/w).Acdid not depend on the CO2concentration in the inlet gas stream as long as the gas stream did not include other amine sensitive components. During the bubbling tests the outlet CO2concentration profiles exhibited a sigmoidal shape that could be described by an exponential equation characterized by an efficiency factor (a) and a form factor (n). Statistical analysis based on correlation analysis indicated that in all cases the experimental data fit the equation well when a was6.1±0.35andnwas2.5±0.12. The results of these experiments may be used to optimize scrubber designs for CO2sequestration from fossil fuel derived flue gases.
- Published
- 2015
19. Fine mapping of V(D)J recombinase mediated rearrangements in human lymphoid malignancies
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Timothy Fuller, Jared P. Steranka, Kathleen H. Burns, Stephen Desiderio, Nicolas Giraldo-Castillo, and Eitan Halper-Stromberg
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Carcinogenesis ,Chromosome Breakpoints ,Oncogenic translocation ,BCL-2 ,MYC ,Biology ,Translocation, Genetic ,DNA sequencing ,03 medical and health sciences ,symbols.namesake ,0302 clinical medicine ,Cell Line, Tumor ,Genetics ,Recombinase ,Humans ,VDJ Recombinases ,030304 developmental biology ,Gene Rearrangement ,Sanger sequencing ,B-Lymphocytes ,0303 health sciences ,Massive parallel sequencing ,Recombinase activity ,Base Sequence ,Lymphoid tumors ,V(D)J recombination ,Chromosome Mapping ,High-Throughput Nucleotide Sequencing ,Sequence Analysis, DNA ,Gene rearrangement ,Leukemia, Lymphoid ,030220 oncology & carcinogenesis ,symbols ,V replacement ,Research Article ,Biotechnology - Abstract
Background Lymphocytes achieve diversity in antigen recognition in part by rearranging genomic DNA at loci encoding antibodies and cell surface receptors. The process, termed V(D)J recombination, juxtaposes modular coding sequences for antigen binding. Erroneous recombination events causing chromosomal translocations are recognized causes of lymphoid malignancies. Here we show a hybridization based method for sequence enrichment can be used to efficiently and selectively capture genomic DNA adjacent to V(D)J recombination breakpoints for massively parallel sequencing. The approach obviates the need for PCR amplification of recombined sequences. Results Using tailored informatics analyses to resolve alignment and assembly issues in these repetitive regions, we were able to detect numerous recombination events across a panel of cancer cell lines and primary lymphoid tumors, and an EBV transformed lymphoblast line. With reassembly, breakpoints could be defined to single base pair resolution. The observed events consist of canonical V(D)J or V-J rearrangements, non-canonical rearrangements, and putatively oncogenic reciprocal chromosome translocations. We validated non-canonical and chromosome translocation junctions by PCR and Sanger sequencing. The translocations involved the MYC and BCL-2 loci, and activation of these was consistent with histopathologic features of the respective B-cell tumors. We also show an impressive prevalence of novel erroneous V-V recombination events at sites not incorporated with other downstream coding segments. Conclusions Our results demonstrate the ability of next generation sequencing to describe human V(D)J recombinase activity and provide a scalable means to chronicle off-target, unexpressed, and non-amplifiable recombinations occurring in the development of lymphoid cancers.
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- 2013
20. Mass transfer in chemical engeering processes - chapter 7 - removal of h2s and co2 from biogas by amine absorp-tion
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Nicolas Giraldo Peralta
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lcsh:TA1-2040 ,lcsh:Engineering (General). Civil engineering (General) - Published
- 2013
21. History of penicillin: Beyond heroes, a social construction
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Nicolás Giraldo-Hoyos
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history ,penicillins ,penicillium ,world war ii ,Medicine ,Medicine (General) ,R5-920 - Abstract
The scientific breakthroug we know as “penicillin”, has been traditionally considered as the result of the genius of Alexander Fleming, awarded with the Nobel Prize for the discovery of the “miracle drug”. Standing aside from this popular idea, it is important to highlight the development of penicillin as a social construct and the product of the invaluable work of several scientists, in addition to an exceptional social framework that raised the political desire and the pharmaceutical industry support; without any of these, penicillin wouldn’t even have the meaning it has today, or it wouldn’t even exist. The epistemological concepts of “style of thinking” and “collectivity of thought” as basis in the construction of knowledge, present in Ludwick Fleck’s epistemological work, support the conclusion, based the historical account, about the need of standing aside from the idea of penicillin as the discovery of a single hero, and considering it a social construction instead, and a classical example of serendipity. Other aspects less known about penicillin history, such as the use of crude penicillin by general practitioners, or the seeking of information about how to produce it during World War II, which are addressed in this brief historical account.
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- 2021
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22. Proliferative dysfunction in chronically activated T lymphocytes from chagasic patients (70.1)
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Nicolas Giraldo, Natalia Bolaños, Adriana Cuellar, Nubia Roa, Zulma Cucunubá, Victor Velasco, Fernando Rosas, Concepción Puerta, and John González
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Immunology ,Immunology and Allergy - Abstract
Background: Trypanosoma cruzi persistence has been associated with cardiac and gastrointestinal tissue damage in nearly 30% of the infected individuals; however, the pathogenic mechanisms are yet unknown. This study’s goal was to compare the activation status and proliferative capacity of T lymphocytes among chronic chagasic patients and uninfected controls. Methodology: Twenty-seven chronic chagasic patients, 20 healthy individuals and 28 non-chagasic cardiomyopathy donors were analyzed. Peripheral blood cells were stained with CD3, CD4, CD8, CD28, HLA-DR and CD38. PBMCs were labeled with CFSE and co-cultivated with PHA or T. cruzi lysate; at the fifth day post-stimulation cells were stained for CD3, CD4 and CD8. Results: Chagasic patients displayed higher frequencies of CD4+ (P=0.0001) and CD8+ (P=0.0002) T cells co-expressing HLA-DR and CD38 in comparison with healthy and non-chagasic cardiomyopathy donors. Also, the former group exhibited lower percentages of CD8+/CD28+ T lymphocytes (P=0.0005). After 5 days of stimulation, the proliferation index was lower in both CD4+ (P=0.01) and CD8+ (P=0.04) PHA-stimulated T cells from chagasic donors when compared with both control groups. Conclusions: Despite their increased activation status, the T lymphocytes from chagasic donors displayed reduced proliferative capacity after mitogenic stimulation, corroborating a dysfunctional cellular immune response in the chronic stages of the disease.
- Published
- 2012
23. Reconteo de los huesos del esqueleto humano
- Author
-
Óscar Andrés Alzate Mejía, Nicolás Giraldo Hoyos, and Liz Verónica Alvarán Arango
- Subjects
Huesos ,Esqueleto ,Terminología ,Medicine ,Medicine (General) ,R5-920 - Abstract
Introducción. Se ha contemplado la idea de que el esqueleto humano posee cierto número de huesos, asignando siempre la misma cantidad de 206 estructuras; en este conteo no se tienen en cuenta sus clasificaciones, las sinostosis ni si se presentan o no variaciones anatómicas. Objetivos. Proponer un nuevo conteo de los huesos del esqueleto humano a partir de la clasificación habitual y renovar la terminología ósea tradicional. Materiales y métodos. Se estudiaron textos de Anatomía empleados en la enseñanza y aprendizaje de las ciencias para la salud, se exploró en diferentes bases de datos enfocadas en el campo de la medicina y, fundamentalmente, se adoptó la terminología apropiada del texto Terminologia Anatomica: International Anatomical Terminology del Comité Internacional Federativo de Terminología Anatómica. Resultados. Se expone la clasificación tradicional del esqueleto humano en axial y apendicular contando cada uno de sus componentes. Conclusión. Se obtiene un nuevo conteo óseo donde se desagrupan el esternón en manubrio, cuerpo y proceso xifoides; en el sacro y el cóccix se cuentan sus vértebras independientes y el coxal se desagrupa contándose independientemente el ilion, el isquion y el pubis. No se tienen en cuenta huesos sesamoideos ni intersuturales.
- Published
- 2016
- Full Text
- View/download PDF
24. First record of the assassin bug genus Coilopus Elkins, 1969 (Hemiptera: Heteroptera: Reduviidae) from Colombia
- Author
-
Dimitri Forero and Nicolás Giraldo-Echeverry
- Subjects
Biology (General) ,QH301-705.5 - Abstract
The assassin bug genus Coilopus Elkins, 1969 is recorded for the first time from Colombia. Coilopus vellus Elkins, 1969 is a wasp mimic that was previously recorded from Costa Rica, French Guiana, and Brazil. The Colombian specimens fill the distributional gap between the known Central and South American records. In addition, based on collected wasps from the same place as Coilopus, Mischocyttarus sp. (Vespidae: Polistinae) is proposed as the hymenopteran model of this mimetic harpactorine.
- Published
- 2015
- Full Text
- View/download PDF
25. Mass Transfer in Chemical Engeering Processes.
- Author
-
Peralta, Nicolas Giraldo
- Subjects
CHEMICAL engineering ,NONFICTION - Abstract
The article reviews the book "Mass Transfer in Chemical Engineering Processes," by J. I. Huertas, N. Giraldo and S. Izquierdo.
- Published
- 2013
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