372 results on '"Juan, Estrada"'
Search Results
52. Data from Context-Dependent Role of Angiopoietin-1 Inhibition in the Suppression of Angiogenesis and Tumor Growth: Implications for AMG 386, an Angiopoietin-1/2–Neutralizing Peptibody
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Jonathan D. Oliner, Robert Radinsky, Richard Kendall, Tom Boone, Luke Li, Donald M. McDonald, Beverly L. Falcón, Isaac J. Hayward, Anthony Ndifor, Shao Xiong Wang, Linh Nguyen, Eunju Hurh, Russell Cattley, Grant Shimamoto, Eric Hsu, Mark L. Michaels, Seog Joon Han, Haejin Kim, David Cordover, Paul Hughes, Sean Caenepeel, Karen Rex, Ling Wang, James McCabe, Brad Bolon, Juan Estrada, Ji-Rong Sun, Tani Ann Lee, Dongyin Yu, Juan Leal, Stephen Kaufman, Hosung Min, James Bready, and Angela Coxon
- Abstract
AMG 386 is an investigational first-in-class peptide-Fc fusion protein (peptibody) that inhibits angiogenesis by preventing the interaction of angiopoietin-1 (Ang1) and Ang2 with their receptor, Tie2. Although the therapeutic value of blocking Ang2 has been shown in several models of tumorigenesis and angiogenesis, the potential benefit of Ang1 antagonism is less clear. To investigate the consequences of Ang1 neutralization, we have developed potent and selective peptibodies that inhibit the interaction between Ang1 and its receptor, Tie2. Although selective Ang1 antagonism has no independent effect in models of angiogenesis-associated diseases (cancer and diabetic retinopathy), it induces ovarian atrophy in normal juvenile rats and inhibits ovarian follicular angiogenesis in a hormone-induced ovulation model. Surprisingly, the activity of Ang1 inhibitors seems to be unmasked in some disease models when combined with Ang2 inhibitors, even in the context of concurrent vascular endothelial growth factor inhibition. Dual inhibition of Ang1 and Ang2 using AMG 386 or a combination of Ang1- and Ang2-selective peptibodies cooperatively suppresses tumor xenograft growth and ovarian follicular angiogenesis; however, Ang1 inhibition fails to augment the suppressive effect of Ang2 inhibition on tumor endothelial cell proliferation, corneal angiogenesis, and oxygen-induced retinal angiogenesis. In no case was Ang1 inhibition shown to (a) confer superior activity to Ang2 inhibition or dual Ang1/2 inhibition or (b) antagonize the efficacy of Ang2 inhibition. These results imply that Ang1 plays a context-dependent role in promoting postnatal angiogenesis and that dual Ang1/2 inhibition is superior to selective Ang2 inhibition for suppression of angiogenesis in some postnatal settings. Mol Cancer Ther; 9(10); 2641–51. ©2010 AACR.
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- 2023
53. Supplementary Methods from AMG 757, a Half-Life Extended, DLL3-Targeted Bispecific T-Cell Engager, Shows High Potency and Sensitivity in Preclinical Models of Small-Cell Lung Cancer
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Paul E. Hughes, Julie M. Bailis, Angela Coxon, Jude Canon, Pedro J. Beltran, Jennitte Stevens, Sean Caenepeel, Yajing Yang, Tobias Raum, Joshua T. Pearson, Matthias Friedrich, Oliver Homann, Fei Lee, Siyuan Liu, Jonathan Werner, Christopher M. Murawsky, Melissa Thomas, Petra Deegen, Jinghui Zhan, Juan Estrada, Edward K. Lobenhofer, Keegan Cooke, and Michael J. Giffin
- Abstract
File contains Supplementary Methods
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- 2023
54. Supplementary Figure 3 from AMG 757, a Half-Life Extended, DLL3-Targeted Bispecific T-Cell Engager, Shows High Potency and Sensitivity in Preclinical Models of Small-Cell Lung Cancer
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Paul E. Hughes, Julie M. Bailis, Angela Coxon, Jude Canon, Pedro J. Beltran, Jennitte Stevens, Sean Caenepeel, Yajing Yang, Tobias Raum, Joshua T. Pearson, Matthias Friedrich, Oliver Homann, Fei Lee, Siyuan Liu, Jonathan Werner, Christopher M. Murawsky, Melissa Thomas, Petra Deegen, Jinghui Zhan, Juan Estrada, Edward K. Lobenhofer, Keegan Cooke, and Michael J. Giffin
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Supplementary Figure 3 Evaluation of DLL3 expression in tumor types other than SCLC.
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- 2023
55. Supplementary Figure 6 from AMG 757, a Half-Life Extended, DLL3-Targeted Bispecific T-Cell Engager, Shows High Potency and Sensitivity in Preclinical Models of Small-Cell Lung Cancer
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Paul E. Hughes, Julie M. Bailis, Angela Coxon, Jude Canon, Pedro J. Beltran, Jennitte Stevens, Sean Caenepeel, Yajing Yang, Tobias Raum, Joshua T. Pearson, Matthias Friedrich, Oliver Homann, Fei Lee, Siyuan Liu, Jonathan Werner, Christopher M. Murawsky, Melissa Thomas, Petra Deegen, Jinghui Zhan, Juan Estrada, Edward K. Lobenhofer, Keegan Cooke, and Michael J. Giffin
- Abstract
Supplementary Figure 6 A, Expression of human CD25, CD69, PD-1, and 4-1BB on human CD4+ T cells isolated from mouse lungs harboring SHP-77 tumors 168 hours after treatment with AMG 757 or a control HLE BiTE® molecule. B, Expression of human CD25, CD69, PD-1, and 4-1BB on human CD8+ T cells isolated from mouse lungs harboring SHP-77 tumors 168 hours after treatment with either AMG 757 or a control HLE BiTE® molecule. *P < 0.05; **P < 0.01; *** P< 0.001
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- 2023
56. Data from AMG 757, a Half-Life Extended, DLL3-Targeted Bispecific T-Cell Engager, Shows High Potency and Sensitivity in Preclinical Models of Small-Cell Lung Cancer
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Paul E. Hughes, Julie M. Bailis, Angela Coxon, Jude Canon, Pedro J. Beltran, Jennitte Stevens, Sean Caenepeel, Yajing Yang, Tobias Raum, Joshua T. Pearson, Matthias Friedrich, Oliver Homann, Fei Lee, Siyuan Liu, Jonathan Werner, Christopher M. Murawsky, Melissa Thomas, Petra Deegen, Jinghui Zhan, Juan Estrada, Edward K. Lobenhofer, Keegan Cooke, and Michael J. Giffin
- Abstract
Purpose:Small-cell lung cancer (SCLC) is an aggressive neuroendocrine tumor with a high relapse rate, limited therapeutic options, and poor prognosis. We investigated the antitumor activity of AMG 757, a half-life extended bispecific T-cell engager molecule targeting delta-like ligand 3 (DLL3)—a target that is selectively expressed in SCLC tumors, but with minimal normal tissue expression.Experimental Design:AMG 757 efficacy was evaluated in SCLC cell lines and in orthotopic and patient-derived xenograft (PDX) mouse SCLC models. Following AMG 757 administration, changes in tumor volume, pharmacodynamic changes in tumor-infiltrating T cells (TILs), and the spatial relationship between the appearance of TILs and tumor histology were examined. Tolerability was assessed in nonhuman primates (NHPs).Results:AMG 757 showed potent and specific killing of even those SCLC cell lines with very low DLL3 expression (Conclusions:AMG 757 has a compelling safety and efficacy profile in preclinical studies making it a viable option for targeting DLL3-expressing SCLC tumors in the clinical setting.
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- 2023
57. Supplementary Tables from AMG 757, a Half-Life Extended, DLL3-Targeted Bispecific T-Cell Engager, Shows High Potency and Sensitivity in Preclinical Models of Small-Cell Lung Cancer
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Paul E. Hughes, Julie M. Bailis, Angela Coxon, Jude Canon, Pedro J. Beltran, Jennitte Stevens, Sean Caenepeel, Yajing Yang, Tobias Raum, Joshua T. Pearson, Matthias Friedrich, Oliver Homann, Fei Lee, Siyuan Liu, Jonathan Werner, Christopher M. Murawsky, Melissa Thomas, Petra Deegen, Jinghui Zhan, Juan Estrada, Edward K. Lobenhofer, Keegan Cooke, and Michael J. Giffin
- Abstract
This file contains Supplementary Tables 1-5
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- 2023
58. Supplementary Methods, Figure Legends, and References from Context-Dependent Role of Angiopoietin-1 Inhibition in the Suppression of Angiogenesis and Tumor Growth: Implications for AMG 386, an Angiopoietin-1/2–Neutralizing Peptibody
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Jonathan D. Oliner, Robert Radinsky, Richard Kendall, Tom Boone, Luke Li, Donald M. McDonald, Beverly L. Falcón, Isaac J. Hayward, Anthony Ndifor, Shao Xiong Wang, Linh Nguyen, Eunju Hurh, Russell Cattley, Grant Shimamoto, Eric Hsu, Mark L. Michaels, Seog Joon Han, Haejin Kim, David Cordover, Paul Hughes, Sean Caenepeel, Karen Rex, Ling Wang, James McCabe, Brad Bolon, Juan Estrada, Ji-Rong Sun, Tani Ann Lee, Dongyin Yu, Juan Leal, Stephen Kaufman, Hosung Min, James Bready, and Angela Coxon
- Abstract
Supplementary Methods, Figure Legends, and References from Context-Dependent Role of Angiopoietin-1 Inhibition in the Suppression of Angiogenesis and Tumor Growth: Implications for AMG 386, an Angiopoietin-1/2–Neutralizing Peptibody
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- 2023
59. Supplementary Figure 1 from Context-Dependent Role of Angiopoietin-1 Inhibition in the Suppression of Angiogenesis and Tumor Growth: Implications for AMG 386, an Angiopoietin-1/2–Neutralizing Peptibody
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Jonathan D. Oliner, Robert Radinsky, Richard Kendall, Tom Boone, Luke Li, Donald M. McDonald, Beverly L. Falcón, Isaac J. Hayward, Anthony Ndifor, Shao Xiong Wang, Linh Nguyen, Eunju Hurh, Russell Cattley, Grant Shimamoto, Eric Hsu, Mark L. Michaels, Seog Joon Han, Haejin Kim, David Cordover, Paul Hughes, Sean Caenepeel, Karen Rex, Ling Wang, James McCabe, Brad Bolon, Juan Estrada, Ji-Rong Sun, Tani Ann Lee, Dongyin Yu, Juan Leal, Stephen Kaufman, Hosung Min, James Bready, and Angela Coxon
- Abstract
Supplementary Figure 1 from Context-Dependent Role of Angiopoietin-1 Inhibition in the Suppression of Angiogenesis and Tumor Growth: Implications for AMG 386, an Angiopoietin-1/2–Neutralizing Peptibody
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- 2023
60. Supplementary Figure 1 from AMG 757, a Half-Life Extended, DLL3-Targeted Bispecific T-Cell Engager, Shows High Potency and Sensitivity in Preclinical Models of Small-Cell Lung Cancer
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Paul E. Hughes, Julie M. Bailis, Angela Coxon, Jude Canon, Pedro J. Beltran, Jennitte Stevens, Sean Caenepeel, Yajing Yang, Tobias Raum, Joshua T. Pearson, Matthias Friedrich, Oliver Homann, Fei Lee, Siyuan Liu, Jonathan Werner, Christopher M. Murawsky, Melissa Thomas, Petra Deegen, Jinghui Zhan, Juan Estrada, Edward K. Lobenhofer, Keegan Cooke, and Michael J. Giffin
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Supplementary Figure 1 DLL3 is differentially expressed in SCLC tumors and cell lines compared with normal tissues.
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- 2023
61. Supplementary Figure 2 from AMG 757, a Half-Life Extended, DLL3-Targeted Bispecific T-Cell Engager, Shows High Potency and Sensitivity in Preclinical Models of Small-Cell Lung Cancer
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Paul E. Hughes, Julie M. Bailis, Angela Coxon, Jude Canon, Pedro J. Beltran, Jennitte Stevens, Sean Caenepeel, Yajing Yang, Tobias Raum, Joshua T. Pearson, Matthias Friedrich, Oliver Homann, Fei Lee, Siyuan Liu, Jonathan Werner, Christopher M. Murawsky, Melissa Thomas, Petra Deegen, Jinghui Zhan, Juan Estrada, Edward K. Lobenhofer, Keegan Cooke, and Michael J. Giffin
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Supplementary Figure 2 Representative photomicrographs of DLL3 immunostaining (brown color) in normal human tissues using immunohistochemistry.
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- 2023
62. Supplementary Figure 5 from AMG 757, a Half-Life Extended, DLL3-Targeted Bispecific T-Cell Engager, Shows High Potency and Sensitivity in Preclinical Models of Small-Cell Lung Cancer
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Paul E. Hughes, Julie M. Bailis, Angela Coxon, Jude Canon, Pedro J. Beltran, Jennitte Stevens, Sean Caenepeel, Yajing Yang, Tobias Raum, Joshua T. Pearson, Matthias Friedrich, Oliver Homann, Fei Lee, Siyuan Liu, Jonathan Werner, Christopher M. Murawsky, Melissa Thomas, Petra Deegen, Jinghui Zhan, Juan Estrada, Edward K. Lobenhofer, Keegan Cooke, and Michael J. Giffin
- Abstract
Supplementary Figure 5 A, DLL3 RNA expression levels in a panel of SCLC patient-derived xenograft (PDX) models compared with positive (NCI-H82) and negative (NCI-H460) control SCLC cell lines. Data are reported as relative quantification normalized to NCI-H460 cell line expression. B, DLL3 protein expression levels in a panel of SCLC PDX models compared with positive (NCI-H82) and negative (NCI-H460) control SCLC cell lines. GAPDH, glyceraldehyde 3-phosphate dehydrogenase.
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- 2023
63. Supplementary Figure 2 from Context-Dependent Role of Angiopoietin-1 Inhibition in the Suppression of Angiogenesis and Tumor Growth: Implications for AMG 386, an Angiopoietin-1/2–Neutralizing Peptibody
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Jonathan D. Oliner, Robert Radinsky, Richard Kendall, Tom Boone, Luke Li, Donald M. McDonald, Beverly L. Falcón, Isaac J. Hayward, Anthony Ndifor, Shao Xiong Wang, Linh Nguyen, Eunju Hurh, Russell Cattley, Grant Shimamoto, Eric Hsu, Mark L. Michaels, Seog Joon Han, Haejin Kim, David Cordover, Paul Hughes, Sean Caenepeel, Karen Rex, Ling Wang, James McCabe, Brad Bolon, Juan Estrada, Ji-Rong Sun, Tani Ann Lee, Dongyin Yu, Juan Leal, Stephen Kaufman, Hosung Min, James Bready, and Angela Coxon
- Abstract
Supplementary Figure 2 from Context-Dependent Role of Angiopoietin-1 Inhibition in the Suppression of Angiogenesis and Tumor Growth: Implications for AMG 386, an Angiopoietin-1/2–Neutralizing Peptibody
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- 2023
64. Supplementary Figure 4 from Context-Dependent Role of Angiopoietin-1 Inhibition in the Suppression of Angiogenesis and Tumor Growth: Implications for AMG 386, an Angiopoietin-1/2–Neutralizing Peptibody
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Jonathan D. Oliner, Robert Radinsky, Richard Kendall, Tom Boone, Luke Li, Donald M. McDonald, Beverly L. Falcón, Isaac J. Hayward, Anthony Ndifor, Shao Xiong Wang, Linh Nguyen, Eunju Hurh, Russell Cattley, Grant Shimamoto, Eric Hsu, Mark L. Michaels, Seog Joon Han, Haejin Kim, David Cordover, Paul Hughes, Sean Caenepeel, Karen Rex, Ling Wang, James McCabe, Brad Bolon, Juan Estrada, Ji-Rong Sun, Tani Ann Lee, Dongyin Yu, Juan Leal, Stephen Kaufman, Hosung Min, James Bready, and Angela Coxon
- Abstract
Supplementary Figure 4 from Context-Dependent Role of Angiopoietin-1 Inhibition in the Suppression of Angiogenesis and Tumor Growth: Implications for AMG 386, an Angiopoietin-1/2–Neutralizing Peptibody
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- 2023
65. Supplementary Figure 4 from AMG 757, a Half-Life Extended, DLL3-Targeted Bispecific T-Cell Engager, Shows High Potency and Sensitivity in Preclinical Models of Small-Cell Lung Cancer
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Paul E. Hughes, Julie M. Bailis, Angela Coxon, Jude Canon, Pedro J. Beltran, Jennitte Stevens, Sean Caenepeel, Yajing Yang, Tobias Raum, Joshua T. Pearson, Matthias Friedrich, Oliver Homann, Fei Lee, Siyuan Liu, Jonathan Werner, Christopher M. Murawsky, Melissa Thomas, Petra Deegen, Jinghui Zhan, Juan Estrada, Edward K. Lobenhofer, Keegan Cooke, and Michael J. Giffin
- Abstract
Supplementary FIgure 4 AMG 757 demonstrated antitumor activity in the WM266-4 melanoma xenograft model.
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- 2023
66. Noise analysis of MIDNA Skipper-CCD readout ASIC
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Fabricio Alcalde Bessia, Troy England, Hongzhi Sun, Davide Braga, Miguel Sofo Haro, José Lipovetzky, Juan Estrada, and Farah Fahim
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- 2023
67. MIDNA: Sub-electron skipper-CCD readout with multichannel cryogenic low-noise readout ASICs
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Troy England, Fabricio Alcalde Bessia, Hongzhi Sun, Leandro Stefanazzi, Davide Braga, Miguel Sofo Haro, Claudio Chavez, Shaorui Li, Juan Estrada, and Farah Fahim
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- 2023
68. Abstract 79: Long-term Patterns Of Patient Transfer In A Regional Telestroke Network
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Juan Estrada, Zhiyu Yan, Kori S Zachrison, Anand Viswanathan, Ashby Turner, Marcelo Matiello, and Lee H Schwamm
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Advanced and Specialized Nursing ,Neurology (clinical) ,Cardiology and Cardiovascular Medicine - Abstract
Background: Telestroke has been increasingly adopted by hospitals with limited access to neurological expertise and is often followed by transfer for a higher level of care. We sought to characterize factors independently associated with patient transfers after telestroke consultation in our regional telestroke network. Methods: We studied all telestroke consults from our urban comprehensive stroke center from 1/1/2005 to 06/30/2022 using the records in our telehealth portal. We examined the annual proportion of transfers among all consults overall and stratified by 6 levels of NIHSS severity and 4 levels of spoke hospital rurality. We used generalized linear mixed models to evaluate the association between transfer and patient demographics, hospital characteristics, use of video and care quality metrics (timeliness and tPA use), accounting for clustering by spoke hospital. Results: We identified 20,618 consecutive telestroke consults, of which 5,276 (25.6%) were transferred (602 cases excluded with unknown transfer status). The proportion of transfers decreased significantly over the study period (Figure). Decreases were observed for all rurality strata and all but the most severe strokes. After adjusting for temporal trends, factors independently associated with transfer included younger age, male gender, more severe stroke, and tPA use (Table). Conclusion: In our regional telestroke network, the proportion of transfers decreased substantially from 2005 to 2022 overall and across almost all patient and hospital groups. Telestroke may facilitate capacity management and retaining care in lower cost community settings, which may increase healthcare value.
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- 2023
69. Dendroclimatic reconstruction of precipitation and temperature for the Mayo River basin in northwestern Mexico
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Aldo Rafael Martínez-Sifuentes, José Villanueva-Díaz, Arián Correa-Díaz, Juan Estrada-Ávalos, Ramón Trucíos-Caciano, Josué Raymundo Estrada-Arellano, Gabriel Fernando Cardoza-Martínez, and Miguel Ángel Garza-Martínez
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Ecology ,Physiology ,Forestry ,Plant Science - Published
- 2022
70. Manejo conservador de parafimosis en equinos: Revisión y reporte de caso clínico
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Manuel Estrada-Umaña, José Vargas-Arrieta, Edgar Alfaro-Umaña, Javier Montero-Umaña, Valeria Zamora, Miguel Somarriba-Soley, and Juan Estrada-McDermott
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General Medicine - Abstract
Un garañón, raza Costarricense de Paso, de 5 años, presentó un trauma de pene durante el coito. desarrolló parafimosis complicada con: edema, hematoma, infección local y ulceraciones cutáneas. Se efectúa una revisión de la literatura relacionada con aspectos importantes del tema, incluyendo la perspectiva de bienestar animal en reproducción caballar. Si se considera que el trauma de pene es un problema relativamente frecuente en equinos, es importante publicar esta información, para beneficio del profesional veterinario que trabaja en condiciones de campo sin el adecuado soporte de un hospital equino, como sucede en algunos países. Se describe cómo fabricar, caseramente, y aplicar un suspensorio genital para el manejo conservador exitoso del problema. Se exponen instrucciones generales para prevenir accidentes relacionados con el coito equino. Este tema se considera materia importante para evitar maltrato animal.
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- 2022
71. Predicting Imbalanced Transport Mode Choice Preferences in a University District with Decision Tree-Based Models
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Jenny Díaz-Ramírez, Juan Estrada-García, and Juliana Figueroa-Sayago
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- 2023
72. ¿Por qué México es un país altamente vulnerable al cambio climático?
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José Ariel Ruiz Corral, Jorge Ernesto Mauricio Ruvalcaba, Gabriel Díaz Padilla, Guillermo Medina García, Juan Estrada Ávalos, and Víctor Manuel Rodríguez Moreno
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business.industry ,media_common.quotation_subject ,Environmental resource management ,Vulnerability ,Climate change ,General Medicine ,Effects of global warming ,Primary sector of the economy ,Scale (social sciences) ,Paradigm shift ,Service (economics) ,Dynamism ,Business ,media_common - Abstract
Este manuscrito proporciona una visión general sobre la vulnerabilidad de México, como región geográfica, a los impactos del cambio climático. Es en el dinamismo del sector primario donde los cambios climáticos globales climáticos globales tienen mayor influencia. Para reescalar las observaciones globales a escala local, regional y nacional, el INIFAP como centro público de investigación, aporta soluciones tecnológicas al alcance de los usuarios, tomadores de decisiones, investigadores, académicos y consultores. Desde su creación, el instituto mantiene líneas de investigación para estudiar los impactos del cambio climático en lo agrícola, pecuario y forestal. Esta la lleva a cabo a través de la organización de encuentros nacionales e internacionales de intercambio técnico-científico y la ejecución de proyectos de investigación y de servicios. A través de la integración y análisis de bases de datos, de la implementación de técnicas de máquinas de aprendizaje en arquitecturas de cómputo, series de tiempo de imágenes satelitales y datos de procesos de intercambio entre la cubierta del suelo y la atmósfera, el Laboratorio Nacional de Modelaje y Sensores Remotos oferta al usuario productos y servicios basados en TICs. Pronósticos numéricos de lluvia y sequía, conforman la oferta institucional para proveer de información útil para la mitigar los efectos del cambio climático en el sector primario. A través de estos productos y servicios se promueve un cambio de paradigma para el estudio de los impactos del cambio climático en México.
- Published
- 2021
73. Estimation of Total Nitrogen Content in Forage Maize (Zea mays L.) Using Spectral Indices: Analysis by Random Forest
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Magali J. López-Calderón, Juan Estrada-Ávalos, Víctor M. Rodríguez-Moreno, Jorge E. Mauricio-Ruvalcaba, Aldo R. Martínez-Sifuentes, Gerardo Delgado-Ramírez, and Enrique Miguel-Valle
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nitrogen content ,remote sensing ,spectral indices ,random forest ,Agriculture (General) ,S1-972 - Abstract
Knowing the total Nitrogen content (Nt) of forage maize (Zea mays) is important so that decisions can be made quickly and efficiently to adjust the timing and amount of both irrigation and fertilizer. In 2017 and 2018 during three growing cycles in two study plots, leaf samples were collected and the Dumas method was used to estimate Nt. During the same growing seasons and on the same sampling plots, a Parrot Sequoia camera mounted on an unmanned aerial vehicle (UAV) was used to collect high resolution images of forage maize study plots. Thirteen multispectral indices were generated and, from these, a Random Forest (RF) algorithm was used to estimate Nt. RF is a machine-learning technique and is designed to work with extremely large datasets. Overall analysis showed five of the 13 indices as the most important. One of these five, the Transformed Chlorophyll Absorption in Reflectance Index/Optimized Soil-Adjusted Vegetation Index, was found to be the most important for estimation of Nt in forage maize (R2 = 0.76). RF handled the complex dataset in a time-efficient manner and Nt did not differ significantly when compared between traditional methods of evaluating Nt at the canopy level and using UAVs and RF to estimate Nt in forage maize. This result is an opportunity to explore many new research options in precision farming and digital agriculture.
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- 2020
- Full Text
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74. Comportamiento hidroclimático de coníferas en el Cerro Potosí, Nuevo León, México
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José Villanueva Díaz, Lorenzo Vázquez Selem, Dr., Juan Estrada Ávalos, Dr., Aldo Rafael Martínez Sifuentes, M.C., Julian Cerano Paredes, Dr., Pamela A. Canizales Velázquez, Dra., Osvaldo Franco Ramos, Dr., and Fatima del Rocío Reyes Camarillo, Biol.
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Coníferas ,dendrocronología ,El Niño Oscilación del Sur ,fenómenos atmosféricos circulatorios ,hidroclima ,variabilidad climática ,Forestry ,SD1-669.5 ,Environmental technology. Sanitary engineering ,TD1-1066 - Abstract
El Cerro Potosí (CPO) se caracteriza por un gradiente altitudinal de 2 200 a 3 719 m y por ser hábitat de diversas coníferas. Los objetivos de este estudio fueron: 1) generar una red dendrocronológica de Pinus culminicola, Pinus hartwegii, Pseudotsuga menziesii y Pinus greggii; 2) desarrollar una reconstrucción de lluvia estacional; y 3) determinar la influencia de fenómenos atmosféricos de circulación general sobre la variabilidad interanual y multianual de la precipitación en CPO. Para lograr esos objetivos, con métodos dendrocronológicos se generaron cuatro cronologías climáticamente sensitivas; la más extensa (1420-2010) fue de Pinus hartwegii, y las más corta (1850-2010), de Pinus greggii. La asociación entre series dendrocronológicas mostró una respuesta climática común y mediante componentes principales. Se integró una serie representativa de los diversos estratos de elevación, que cubre el período 1700-2010. La reconstrucción de lluvia estacional enero-septiembre detectó que los años más secos fueron 1785 y 1801, y los más húmedos, 1791, 1832 y 1911, con una influencia significativa (r= 0.53, p
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- 2018
- Full Text
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75. Assessing the Electromagnetic Field Exposure of 5G Transmitters
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Juan Estrada, Enric Pardo, Ramiro Camino, and Sébastien Faye
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- 2022
76. Design of a Skipper CCD Focal Plane for the SOAR Integral Field Spectrograph
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Edgar Marrufo Villalpando, Alex Drlica-Wagner, Marco Bonati, Abhishek Bakshi, Vanessa Bawden de Paula Macanhan, Braulio Cancino, Gregory E. E. Derylo, Juan Estrada, Guillermo Fernandez Moroni, Luciano Fraga, Stephen Holland, Michelle J. J. Jonas, Agustin Lapi, Peter Moore, Andrés A. Plazas Malagón, Leandro Stefanazzi, and Javier Tiffenberg
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FOS: Physical sciences ,Astrophysics - Instrumentation and Methods for Astrophysics ,Instrumentation and Methods for Astrophysics (astro-ph.IM) - Abstract
We present the development of a Skipper Charge-Coupled Device (CCD) focal plane prototype for the SOAR Telescope Integral Field Spectrograph (SIFS). This mosaic focal plane consists of four 6k $\times$ 1k, 15 $\mu$m pixel Skipper CCDs mounted inside a vacuum dewar. We describe the process of packaging the CCDs so that they can be easily tested, transported, and installed in a mosaic focal plane. We characterize the performance of $\sim 650 \mu$m thick, fully-depleted engineering-grade Skipper CCDs in preparation for performing similar characterization tests on science-grade Skipper CCDs which will be thinned to 250$\mu$m and backside processed with an antireflective coating. We achieve a single-sample readout noise of $4.5 e^{-} rms/pix$ for the best performing amplifiers and sub-electron resolution (photon counting capabilities) with readout noise $\sigma \sim 0.16 e^{-} rms/pix$ from 800 measurements of the charge in each pixel. We describe the design and construction of the Skipper CCD focal plane and provide details about the synchronized readout electronics system that will be implemented to simultaneously read 16 amplifiers from the four Skipper CCDs (4-amplifiers per detector). Finally, we outline future plans for laboratory testing, installation, commissioning, and science verification of our Skipper CCD focal plane.
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- 2022
77. Fast readout of the Skipper CCD for astronomy and quantum imaging
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Agustin Lapi, Fernando Chierchie, Guillerme Fernandez-Moroni, Leandro Stefanazzi, Eduardo Paolini, Juan Estrada, Alex Drlica-Wagner, Edgar Marrufo Villalpando, and Javier Tiffenberg
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- 2022
78. OncoVEXmGM-CSFexpands tumor antigen-specific CD8+ T-cell response in preclinical models
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Juan Estrada, Jinghui Zhan, Petia Mitchell, Jonathan Werner, Pedro J Beltran, Jason DeVoss, Jing Qing, and Keegan S Cooke
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Pharmacology ,Cancer Research ,Oncology ,Immunology ,Molecular Medicine ,Immunology and Allergy - Abstract
BackgroundCheckpoint inhibitors targeting cytotoxic T-lymphocyte-associated protein 4 (CTLA-4) and programmed cell death protein 1 (PD-1)/programmed cell death ligand 1 (PD-L1) have demonstrated clinical efficacy in advanced melanoma, but only a subset of patients with inflamed tumors are responsive. Talimogene laherparepvec (T-VEC), a modified herpes simplex virus type 1 (HSV-1) expressing granulocyte-macrophage colony-stimulating factor (GM-CSF), is a first-in-class oncolytic immunotherapy approved for the treatment of melanoma and has been shown to inflame the tumor microenvironment. To evaluate the potential and mechanisms of T-VEC to elicit systemic antitumor immunity and overcome resistance to checkpoint inhibitors in murine tumor models, OncoVEXmGM-CSFwas developed similarly to T-VEC, except the human GM-CSF transgene was replaced with murine GM-CSF. Previous work had demonstrated that OncoVEXmGM-CSFgenerated systemic antitumor immunity dependent on CD8+ T cells in an immune checkpoint-sensitive tumor cell model.MethodsA novel B16F10 syngeneic tumor model with both HSV-1−permissive subcutaneous tumors and HSV-1−refractory experimental lung metastasis was used to study the local and systemic effects of OncoVEXmGM-CSFtreatment alone or in combination with checkpoint inhibitors.ResultsIntratumoral injection of OncoVEXmGM-CSFin combination with an anti-CTLA-4 or anti-PD-1 blocking antibody led to increased tumor growth inhibition, a reduction in the number of lung metastases, and prolonged animal survival. OncoVEXmGM-CSFinduced both neoantigen-specific and tumor antigen-specific T-cell responses. Furthermore, cured mice from the combination treatment of OncoVEXmGM-CSFand anti-CTLA-4 antibody rejected tumor rechallenges.ConclusionsThese data support the concept that T-VEC and checkpoint inhibition may be an effective combination to treat patients with advanced melanoma.
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- 2023
79. WiMax Network Infrastructure for Telemedicine Application in the Colombian Region of the Caucan Pacific.
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Eugenio Gaeta, Mario Pansera, Juan Estrada, and María Teresa Arredondo
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- 2009
80. Intramuscular insulin administration potentiates sympathetic and pressor responses to capsaicin in rats
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Ayumi Fukazawa, Amane Hori, Norio Hotta, Juan Estrada, Kimiaki Katanosaka, Kazue Mizumura, Jun Sato, Rie Ishizawa, Han‐Kyul Kim, Gary A. Iwamoto, Wanpen Vongpatanasin, Jere H. Mitchell, Scott A. Smith, and Masaki Mizuno
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Genetics ,Molecular Biology ,Biochemistry ,Biotechnology - Published
- 2022
81. Regional Changes in Patterns of Stroke Presentation During the COVID-19 Pandemic
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Lee H. Schwamm, Lukas Sveikata, Aneesh B. Singhal, Mark R Etherton, Martin Bretzner, Juan Estrada, Kori S. Zachrison, Zhiyu Yan, and Anand Viswanathan
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Male ,medicine.medical_specialty ,Coronavirus disease 2019 (COVID-19) ,Stroke severity ,Article ,New England ,Epidemiology ,Pandemic ,medicine ,Humans ,In patient ,Pandemics ,Stroke ,Aged ,Retrospective Studies ,Demography ,Thrombectomy ,Aged, 80 and over ,Advanced and Specialized Nursing ,Delivery of Health Care, Integrated ,business.industry ,COVID-19 ,Retrospective cohort study ,Middle Aged ,medicine.disease ,Telemedicine ,Hospitals ,Emergency medicine ,Female ,Neurology (clinical) ,Morbidity ,Presentation (obstetrics) ,Cardiology and Cardiovascular Medicine ,business - Abstract
Background and Purpose: Patient care-seeking has likely changed during the coronavirus disease 2019 (COVID-19) pandemic. In stroke, delayed or avoided care may translate to substantial morbidity. We sought to determine the effect of the pandemic on patterns of stroke patient presentation and quality of care. Methods: We analyzed data from 25 New England hospitals: one urban, academic comprehensive stroke center and telestroke hub, and 24 spoke hospitals in the telestroke network. We included all telestroke consultations from the 24 spokes, and all stroke admissions to the comprehensive stroke center hub from November 1, 2019 through April 30, 2020. We compared rates of presentation, timeliness presentation, and quality of care pre- versus post-March 1, 2020. We examined trends in patient demographics, stroke severity, timeliness, diagnoses including large vessel occlusion, alteplase use, and endovascular thrombectomy among eligible subjects. We compared proportions and bivariate comparisons to examine for changes pre- versus post-March 1, 2020 and used linear regression to examine trends over time. Results: Among 1248 patient presentations (844 telestroke consultations, 404 comprehensive stroke center admissions), telestroke consultations and ischemic stroke patient admissions decreased among the spokes and hub. Age and stroke severity were unchanged over the study period. We found no change in alteplase administration at telestroke spoke hospitals but did note a decrease in both alteplase use and thrombectomy at our comprehensive stroke center. Time metrics for patient presentation and care delivery were unchanged; however, rates of adherence for the quality measures dysphagia screening, early antithrombotic initiation, and early venous thromboembolism prophylaxis were reduced during the pandemic. Conclusions: In this regional analysis, we found decreasing telestroke consultations and ischemic stroke admissions, and reduced performance on stroke quality of care measures during the COVID-19 pandemic. Contrary to prior reports, we did not find an increase in thrombectomy nor decrease in clinical severity that might be expected if patients with milder symptoms avoided hospitalization.
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- 2021
82. AMG 757, a Half-Life Extended, DLL3-Targeted Bispecific T-Cell Engager, Shows High Potency and Sensitivity in Preclinical Models of Small-Cell Lung Cancer
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Jinghui Zhan, Christopher Murawsky, Petra Deegen, Jonathan Werner, Oliver Homann, Siyuan Liu, Melissa Thomas, Angela Coxon, Keegan Cooke, Pedro J. Beltran, Joshua T. Pearson, Juan Estrada, Fei Lee, Tobias Raum, Julie M. Bailis, Matthias Friedrich, Jude Canon, Jennitte Stevens, Giffin Michael John, Sean Caenepeel, Yajing Yang, Paul E. Hughes, and Edward K. Lobenhofer
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0301 basic medicine ,Cancer Research ,Lung Neoplasms ,T-Lymphocytes ,T cell ,Antineoplastic Agents ,Apoptosis ,Mice, SCID ,Mice ,03 medical and health sciences ,0302 clinical medicine ,Mice, Inbred NOD ,Antibodies, Bispecific ,Tumor Cells, Cultured ,Animals ,Humans ,Medicine ,Potency ,Lung cancer ,Cell Proliferation ,business.industry ,Intracellular Signaling Peptides and Proteins ,Antibodies, Monoclonal ,Membrane Proteins ,Half-life ,medicine.disease ,Small Cell Lung Carcinoma ,Xenograft Model Antitumor Assays ,respiratory tract diseases ,Gene Expression Regulation, Neoplastic ,030104 developmental biology ,medicine.anatomical_structure ,Oncology ,Tolerability ,Cell culture ,030220 oncology & carcinogenesis ,Pharmacodynamics ,Cancer research ,Female ,Non small cell ,business - Abstract
Purpose: Small-cell lung cancer (SCLC) is an aggressive neuroendocrine tumor with a high relapse rate, limited therapeutic options, and poor prognosis. We investigated the antitumor activity of AMG 757, a half-life extended bispecific T-cell engager molecule targeting delta-like ligand 3 (DLL3)—a target that is selectively expressed in SCLC tumors, but with minimal normal tissue expression. Experimental Design: AMG 757 efficacy was evaluated in SCLC cell lines and in orthotopic and patient-derived xenograft (PDX) mouse SCLC models. Following AMG 757 administration, changes in tumor volume, pharmacodynamic changes in tumor-infiltrating T cells (TILs), and the spatial relationship between the appearance of TILs and tumor histology were examined. Tolerability was assessed in nonhuman primates (NHPs). Results: AMG 757 showed potent and specific killing of even those SCLC cell lines with very low DLL3 expression ( Conclusions: AMG 757 has a compelling safety and efficacy profile in preclinical studies making it a viable option for targeting DLL3-expressing SCLC tumors in the clinical setting.
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- 2021
83. Teleneurology-Enabled Determination of Death by Neurologic Criteria After Cardiac Arrest or Severe Neurologic Injury
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Pooja Singla, Ashby C Turner, Juan Estrada, Patrick T. Lee, Marcelo Matiello, Barrett T. Kitch, Cynthia Whitney, Uma Girkar, Lee H. Schwamm, and Rafael Palacios
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Male ,Brain Death ,medicine.medical_specialty ,Intensivist ,Retrospective data ,law.invention ,Interquartile range ,law ,medicine ,Humans ,Organ donation ,Referral and Consultation ,Aged ,Retrospective Studies ,Neurologic Examination ,Coma ,business.industry ,Retrospective cohort study ,Middle Aged ,Intensive care unit ,Telemedicine ,Tissue Donors ,Heart Arrest ,Neurologic injury ,Neurology ,Emergency medicine ,Female ,Neurology (clinical) ,medicine.symptom ,business - Abstract
ObjectiveTo determine whether providing teleneurology (TN) consultations aiding in determination of death by neurologic criteria (DNC) to a bedside intensivist is feasible and whether timely access and expert input increase the quality of the DNC examination and identification of potential organ donors, we reviewed retrospective data related to outcomes of such consultations.MethodsBetween November 2017 and March 2019, TN consults were requested for sequential comatose patients in the intensive care unit (ICU). We recorded patients' demographic information, causes leading to coma or suspected DNC, and the results of TN consultations. We obtained data on the number of referrals to the organ bank and number of organ donors.ResultsNinety-nine consults were performed with a median time from request to start of the consult of 20.2 minutes (interquartile range 5.4–65.3 minutes). Eighty consults were requested for determination of prognosis, whereas 19 consults were requested for supervision of the DNC examination. In 1 of 80 (1.2%) prognostication consults, the patient was determined by the neurologist to require assessment of DNC and was found to meet DNC criteria; determination of DNC occurred in 11 of the 19 (57.9%) consultations for a supervised DNC examination. In a comparison of the pre-TN (94 months) and post-TN (17 months) periods, there was 2.56-fold increase in the proportion of patients meeting DNC criteria who were medically suitable for donation (pre-TN 8.9% vs post-TN 21.1%, p = 0.02) and a 2.12-fold increase in the proportion of donors (pre-TN 6.14% vs post-TN 13.1%, p = 0.14).ConclusionsIt is feasible to perform TN consultations for patients with severe neurologic damage and to allow expert supervision for DNC examination. Having a teleneurologist as part of the ICU assessment team helped differentiate severe neurologic deficits from DNC and was associated with increase in organ donation.
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- 2021
84. Skipper Charge-Coupled Device for Low-Energy-Threshold Particle Experiments above Ground
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Guillermo Fernandez Moroni, Fernando Chierchie, Javier Tiffenberg, Ana Botti, Mariano Cababie, Gustavo Cancelo, Eliana L. Depaoli, Juan Estrada, Stephen E. Holland, Dario Rodrigues, Iván Sidelnik, Miguel Sofo Haro, Leandro Stefanazzi, and Sho Uemura
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General Physics and Astronomy - Published
- 2022
85. Análisis sobre cambio de uso de suelo en dos escalas de trabajo
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Ramón Trucíos Caciano, Miguel Rivera González, Gerardo Delgado Ramírez, Juan Estrada Ávalos, and Julian Cerano Paredes
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sistemas de información geográfica ,interpretación monoscópica ,cuantificación de áreas ,Agriculture ,Agriculture (General) ,S1-972 - Abstract
Las zonas con vegetación natural son parte de la mega-biodiversidad por la cual México es considerado uno de los principales países con esta diversidad biológica. Sin embargo, la diversidad esta siendo amenazada, en estudios a nivel nacional se evidencia la pérdida de cubierta vegetal como un proceso de cambio de uso de suelo para el desarrollo de actividades que representen mayor satisfacción social. El objetivo de este estudio fue conocer el estado que guarda la vegetación de la cuenca de San Cristóbal de las Casas, Chiapas, en respuesta al cambio de uso predominante hacia actividades agropecuarias, a través de un análisis de cambio de uso de suelo, para dos escalas de trabajo, con el uso de sistemas de información geográfica como herramienta de análisis. Para la escala 1:250 000 de 1976 a 2002, se encontró que la pérdida de cobertura vegetal es evidente ya que se cuantificaron incrementos mayores a 5000 ha para agricultura de temporal, relacionados a disminución de superficies de bosques y pastizales. En esta misma escala, las áreas urbanas se incrementaron en más de 10 veces su superficie en el mismo periodo de tiempo, de 149 ha a 1903 ha. Por otra parte, a escala 1:10 000, de 1996 al 2010, las superficies con vegetación natural disminuyeron 493 ha, mientras que se cuantificó un incremento de áreas agrícolas y urbanas de 3926 y 1791 ha respectivamente.
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- 2013
86. Variabilidad hidroclimática reconstruida con anillos de árboles para la cuenca Lerma Chapala en Guanajuato, México
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José Villanueva Díaz, Julián Cerano Paredes, Juan Estrada Ávalos, Vicenta Constante García, and Eunice N. Cortés Barrera
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guanajuato, lerma chapala, dendrocronología, índice de ancho de anillo, precipitación reconstruida, variabilidad hidroclimática, enso, sequías ,Hydraulic engineering ,TC1-978 ,Water supply for domestic and industrial purposes ,TD201-500 - Abstract
El conocimiento histórico del clima es básico para entender sus variaciones y tendencias en el tiempo. En este estudio se desarrollaron seis cronologías de anillos de árboles, con una extensión cercana a 250 años, en el área de Guanajuato, Jalisco y Querétaro, dentro de la cuenca Lerma Chapala. Se utilizaron dos especies para este propósito: Taxodium mucronatum y Pinus cembroides. Se desarrolló una reconstrucción estacional de precipitación invierno-primavera (enero-mayo) del periodo 1770-2007, para la región centro-sur de Guanajuato; mientras que para el noroeste del estado, se generaron dos reconstrucciones de precipitación estacional, una para el periodo marzo-septiembre y la otra anual (enero-diciembre), con una extensión de 208 años (1790-2007) y 158 años (1850-2007), respectivamente. En las reconstrucciones estuvieron presentes eventos hidroclimáticos severos reportados en archivos históricos por producir carestía de alimentos, hambrunas, brotes epidémicos, migraciones y otras calamidades, como las sequías de las décadas de 1860, 1890, 1920, 1950, 1970 y 1990, lo que corrobora la veracidad de las mismas. Un análisis del efecto histórico de ENSO en la disponibilidad de lluvia, índice de ancho de anillos y producción de cultivos de temporal, mostró alta inconsistencia en su impacto y sólo aquellos eventos de alta intensidad tuvieron influencia en la variabilidad de la precipitación. Dicho comportamiento enfatiza la necesidad de investigar con más detalle otras variables climáticas que, aunadas al fenómeno ENSO, pudieran explicar la variabilidad hidroclimática en esta región.
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- 2012
87. Spatial modeling of the ecological niche of Pinus greggii Engelm. (Pinaceae): a species conservation proposal in Mexico under climatic change scenarios
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J.L. Becerra-López, J.A. Hernández-Herrera, Ulises Manzanilla-Quiñones, A.H. Velázquez-Pérez, Aldo R. Martínez-Sifuentes, Juan Estrada-Ávalos, and José Villanueva-Díaz
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Ecological niche ,In situ conservation ,Ecology ,biology ,Species distribution ,sierra madre oriental ,conservation ,Climate change ,Forestry ,Edaphic ,biology.organism_classification ,Pinus greggii ,climate change ,Habitat ,Pinaceae ,pinus greggii ,maxent ,Environmental science ,lcsh:SD1-669.5 ,Physical geography ,lcsh:Forestry ,Nature and Landscape Conservation - Abstract
Pinus greggii is a species of socio-economic importance in terms of wood production and environmental services in Mexico, though it is restricted by particular environmental conditions to the Sierra Madre Occidental. Species distribution models are geospatial tools widely used in the identification and delineation of species’ distribution areas and zones susceptible to climate change. The objectives of this study were to: (i) model and quantify the environmentally suitable area for Pinus greggii in Mexico, and possible future distributions under four different scenarios of climate change; (ii) identify the most relevant environmental variables that will possibly drive changes in future distribution; and (iii) to propose adequate zones for the species’ conservation in Mexico. Some 438 records of Pinus greggii from several national and international databases were obtained, and duplicates were discarded to avoid overestimations in the models. Climatic, edaphic, and topographic variables were used and 100 distribution models for current and future scenarios were generated using the Maxent software. The best model had an area under the curve (AUC) of 0.88 and 0.93 for model training and validation, respectively, a partial ROC of 1.94, and a significant Z test (p
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- 2020
88. Interleaved Readout of Charge-Coupled Devices (CCDs) for Correlated Noise Reduction
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Javier Tiffenberg, Leandro Stefanazzi, Gustavo Cancelo, Eduardo E. Paolini, Fernando Chierchie, Miguel Sofo Haro, Juan Estrada, and Guillermo Fernandez Moroni
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Physics ,Pixel ,Interleaving ,Noise measurement ,Physics::Instrumentation and Detectors ,Noise reduction ,Reading (computer) ,020208 electrical & electronic engineering ,Astrophysics::Instrumentation and Methods for Astrophysics ,Charge (physics) ,02 engineering and technology ,Noise ,Logic gate ,0202 electrical engineering, electronic engineering, information engineering ,Electronic engineering ,Electrical and Electronic Engineering ,Instrumentation - Abstract
This article proposes a new technique to reduce the readout noise in charge-coupled devices (CCDs). The objective is to minimize the common noise between the channels. This noise is either induced by the readout electronics or by the environment, and it could be present in small (single CCD and a few channels) or large systems (dozens of CCDs and hundreds of channels). By interleaving the video signals, we show that it is possible to reduce the readout noise by around 50% without sacrificing output channels at the expense of a moderate increase of the readout time, which is less compared with other techniques. Up until now, similar approaches have used half of the output stages only for noise measurement doubling the total readout time of the sensor. Simulations and experimental results are presented to validate the proposed approach. Moreover, the technique is measured using a Skipper CCD, and its operation is validated together with the ability of the Skipper sensor for nondestructively reading, several times, the same pixel charge. With the combination of both techniques, we achieve deep subelectron readout noise levels (0.1 e−).
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- 2020
89. Dark Energy Survey Year 3 results: cosmology with moments of weak lensing mass maps – validation on simulations
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M. Smith, Daniel Gruen, D. W. Gerdes, F. Paz-Chinchón, D. J. James, J. Carretero, G. Tarle, Ian Harrison, J. Gschwend, Shantanu Desai, Marcos Lima, Kyler Kuehn, M. Carrasco Kind, Ramon Miquel, E. Suchyta, Juan Garcia-Bellido, August E. Evrard, Felipe Menanteau, Daniel Thomas, E. Buckley-Geer, Jennifer L. Marshall, L. Whiteway, Peter Doel, Juan Estrada, M. March, J. DeRose, L. F. Secco, Josh Frieman, V. Scarpine, Oliver Friedrich, Michael Schubnell, H. T. Diehl, Enrique Gaztanaga, Michael Troxel, T. M. C. Abbott, David Bacon, Martin Crocce, Pablo Fosalba, A. Carnero Rosell, Marcelle Soares-Santos, Niall MacCrann, S. Everett, Peter Melchior, David J. Brooks, R. Cawthon, Elisabeth Krause, E. J. Sanchez, Antonella Palmese, M. A. G. Maia, M. E. C. Swanson, A. A. Plazas, D. L. Burke, S. Santiago, J. Annis, I. Sevilla-Noarbe, T. McClintock, S. Allam, Robert A. Gruendl, J. De Vicente, L. N. da Costa, Santiago Avila, Carlos Solans Sanchez, Chihway Chang, Bhuvnesh Jain, M. D. Johnson, Joe Zuntz, Niall Jeffrey, I. Ferrero, Tim Eifler, G. Gutierrez, M. Gatti, Henry Luce Foundation, Department of Energy (US), National Science Foundation (US), Ministerio de Ciencia, Innovación y Universidades (España), Science and Technology Facilities Council (UK), University of Illinois, Kavli Institute for Theoretical Physics, University of Chicago, The Ohio State University, Texas A&M University, Financiadora de Estudos e Projetos (Brasil), Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro, Conselho Nacional de Desenvolvimento Científico e Tecnológico (Brasil), Ministério da Ciência, Tecnologia e Inovação (Brasil), German Research Foundation, European Commission, Generalitat de Catalunya, and Fermilab
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Cosmology and Nongalactic Astrophysics (astro-ph.CO) ,Large-scale structure of Universe ,Higher education ,FOS: Physical sciences ,Library science ,Astrophysics::Cosmology and Extragalactic Astrophysics ,7. Clean energy ,01 natural sciences ,Gravitational lensing: weak ,Observatory ,0103 physical sciences ,media_common.cataloged_instance ,MECÂNICA ESTATÍSTICA ,European union ,Astronomy observatory ,010303 astronomy & astrophysics ,media_common ,Physics ,010308 nuclear & particles physics ,business.industry ,European research ,Cosmology: observations ,Astronomy and Astrophysics ,13. Climate action ,Space and Planetary Science ,Fundamental physics ,Christian ministry ,business ,National laboratory ,Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
We present a simulated cosmology analysis using the second and third moments of the weak lensing mass (convergence) maps. The second moment, or variances, of the convergence as a function of smoothing scale contains information similar to standard shear two-point statistics. The third moment, or the skewness, contains additional non-Gaussian information. The analysis is geared towards the third year (Y3) data from the Dark Energy Survey (DES), but the methodology can be applied to other weak lensing data sets. We present the formalism for obtaining the convergence maps from the measured shear and for obtaining the second and third moments of these maps given partial sky coverage. We estimate the covariance matrix from a large suite of numerical simulations. We test our pipeline through a simulated likelihood analyses varying 5 cosmological parameters and 10 nuisance parameters and identify the scales where systematic or modelling uncertainties are not expected to affect the cosmological analysis. Our simulated likelihood analysis shows that the combination of second and third moments provides a 1.5 per cent constraint on S8 σ8(ωm/0.3)0.5 for DES Year 3 data. This is 20 per cent better than an analysis using a simulated DES Y3 shear two-point statistics, owing to the non-Gaussian information captured by the inclusion of higher order statistics. This paper validates our methodology for constraining cosmology with DES Year 3 data, which will be presented in a subsequent paper., Funding for the DES Projects has been provided by the U.S. Department of Energy, the U.S. National Science Foundation, the Ministry of Science and Education of Spain, the Science and Technology Facilities Council of the United Kingdom, the Higher Education Funding Council for England, the National Center for Supercomputing Applications at the University of Illinois at Urbana-Champaign, the Kavli Institute of Cosmological Physics at the University of Chicago, the Center for Cosmology and Astro-Particle Physics at the Ohio State University, the Mitchell Institute for Fundamental Physics and Astronomy at Texas A&M University, Financiadora de Estudos e Projetos, Fundac¸ao Carlos Chagas Filho de Amparo ˜ a Pesquisa do ` Estado do Rio de Janeiro, Conselho Nacional de Desenvolvimento Cient´ıfico e Tecnologico and the Minist ´ erio da Ci ´ encia, Tecnologia ˆ e Inovac¸ao, the Deutsche Forschungsgemeinschaft and the Collabo- ˜ rating Institutions in the Dark Energy Survey. The Collaborating Institutions are Argonne National Laboratory, the University of California, Santa Cruz, the University of Cambridge, Centro de Investigaciones Energeticas, Medioambientales y ´ Tecnologicas-Madrid, the University of Chicago, University College ´ London, the DES-Brazil Consortium, the University of Edinburgh, the Eidgenossische Technische Hochschule (ETH) Z ¨ urich, Fermi ¨ National Accelerator Laboratory, the University of Illinois at UrbanaChampaign, the Institut de Ciencies de l’Espai (IEEC/CSIC), the ` Institut de F´ısica d’Altes Energies, Lawrence Berkeley National Laboratory, the Ludwig-Maximilians Universitat M¨ unchen, and the ¨ associated Excellence Cluster Universe, the University of Michigan, the National Optical Astronomy Observatory, the University of Nottingham, the Ohio State University, the University of Pennsylvania, the University of Portsmouth, SLAC National Accelerator Laboratory, Stanford University, the University of Sussex, Texas A&M University, and the OzDES Membership Consortium. Based in part on observations at Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy (AURA) under a cooperative agreement with the National Science Foundation. The DES data management system is supported by the National Science Foundation under Grant Numbers AST-1138766 and AST-1536171. The DES participants from Spanish institutions are partially supported by MINECO under grants AYA2015- 71825, ESP2015-66861, FPA2015-68048, SEV-2016-0588, SEV2016-0597, and MDM-2015-0509, some of which include ERDF funds from the European Union. IFAE is partially funded by the CERCA program of the Generalitat de Catalunya. Research leading to these results has received funding from the European Research Council under the European Union 7th Framework Program (FP7/2007-2013) including ERC grant agreements 240672, 291329, and 306478. We acknowledge support from the Brazilian Instituto Nacional de Ciencia e Tecnologia (INCT) e-Universe (CNPq grant ˆ 465376/2014-2). This manuscript has been authored by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics.
- Published
- 2020
90. 243 years of reconstructed streamflow volume and identification of extreme hydroclimatic events in the Conchos River Basin, Chihuahua, Mexico
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Aldo R. Martínez-Sifuentes, Juan Estrada-Ávalos, Teodoro Carlón-Allende, and José Villanueva-Díaz
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geography ,geography.geographical_feature_category ,010504 meteorology & atmospheric sciences ,Ecology ,Physiology ,0208 environmental biotechnology ,Drainage basin ,Forestry ,02 engineering and technology ,Plant Science ,Structural basin ,01 natural sciences ,020801 environmental engineering ,Climatology ,Streamflow ,Evapotranspiration ,Atlantic multidecadal oscillation ,Dendrochronology ,Environmental science ,Precipitation ,Pacific decadal oscillation ,0105 earth and related environmental sciences - Abstract
The extreme hydroclimatic events in the Conchos River Basin, are strongly associated with ocean–atmospheric phenomena such as the El Nino Southern Oscillation, Pacific Decadal Oscillation, and Atlantic Multidecadal Oscillation, the streamflow reconstruction showed the occurrence of up to 10-year droughts. Dendrochronology is a modern science used to study hydroclimatic events through the measurement and standardization of tree-rings. Long-term dendrochronological series contribute to the improvement of our knowledge of past climatic events and provide information for wise management of water resources. The objective of this study was to generate an actualized streamflow volume reconstruction with a regional chronology and identify extreme hydroclimatic events in the Conchos River Basin. We analyzed the hydroclimatic behavior of the streamflow volume through a dendrochronological network in the Basin. The regional earlywood chronology was analyzed by single correlation and principal component analysis, which allowed obtaining the transfer model to determine extreme hydroclimatic events and defined the influence of large-scale ocean–atmospheric phenomena. Nine earlywood series showed a common variance and responded significantly (r = 0.68, n = 67, p
- Published
- 2020
91. Runoff reconstruction and climatic influence with tree rings, in the Mayo river basin, Sonora, Mexico
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Juan Estrada-Ávalos, Aldo R. Martínez-Sifuentes, and José Villanueva-Díaz
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0106 biological sciences ,dendrohydrology ,Population ,Drainage basin ,01 natural sciences ,Pinus arizonica ,enso ,Evapotranspiration ,Dendrochronology ,Precipitation ,lcsh:Forestry ,education ,Nature and Landscape Conservation ,assimilated data ,geography ,education.field_of_study ,geography.geographical_feature_category ,Ecology ,biology ,Forestry ,04 agricultural and veterinary sciences ,biology.organism_classification ,Water resources ,040103 agronomy & agriculture ,lcsh:SD1-669.5 ,0401 agriculture, forestry, and fisheries ,Environmental science ,Physical geography ,Surface runoff ,pinus arizonica ,010606 plant biology & botany - Abstract
Dendrochronological series are reliable sources of information to analyze past hydrological and climatological variation that provides useful information for the management of water resources within basins. We analyzed dendrochronological series obtained from the upper Mayo River Basin using principal components analysis to determine a common climatic signal. Although the complete series extended for over 350 years, the representative period common to all series was from 1750 to 2014 (265 years) with an expressed population signal of over 0.85. Climate data (precipitation and temperature) were collected from the North American Land Data Assimilation System 2 model of the Land Data Assimilation System and hydrometrics records were obtained from the National Commission of Water in Mexico. The results of the response function showed an association of mean monthly temperature with the ring width series for the months of December of the previous year, May and October of the year of growth, and seasonally from January to July (r = -0.75, n = 36, p < 0.05). A significant response to rainfall of earlywood growth was observed for June, November, and December of the previous year, January and February of the growth year, and seasonally, from October of previous year to May of the current growth year (r = 0.70, n = 35, p < 0.05). Significant association also was found between earlywood and the accumulated runoff from October of the previous year to May of the growth year, which was used for reconstruction of the runoff flow between 1750 and 2014, which showed evidence of decadal drought. Significant correlation was found between the reconstructed runoff series, and the Southern Oscillation index (r = -0.42, n = 228, p < 0.05), but not significant with the Pacific Decadal Oscillation index (r = 0.16, n = 115, p < 0.05). We also observed significant (p < 0.05) associations with the drought indices Palmer Drought Severity Index and Standardized Precipitation Evapotranspiration Index (r = 0.56, r = 0.41, respectively). Our study demonstrated the potential of assimilated data for dendroclimatic reconstructions and the feasibility of generating hydroclimatic information of extreme events that have not been recorded in the available climatic and hydrological instrumental records.
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- 2020
92. Detailed modeling of the video signal and optimal readout of charge‐coupled devices
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Guillermo Fernandez Moroni, Gustavo Cancelo, Miguel Sofo Haro, Fernando Chierchie, Leandro Stefanazzi, Juan Estrada, Pedro Querejeta Simbeni, and Eduardo E. Paolini
- Subjects
Physics::Instrumentation and Detectors ,Computer science ,Noise reduction ,INGENIERÍAS Y TECNOLOGÍAS ,02 engineering and technology ,Signal ,CHARGE COUPLED DEVICES ,0202 electrical engineering, electronic engineering, information engineering ,Electronic engineering ,Ingeniería Eléctrica y Electrónica ,Electrical and Electronic Engineering ,Ingeniería Eléctrica, Ingeniería Electrónica e Ingeniería de la Información ,Capacitive coupling ,Pixel ,Noise (signal processing) ,Applied Mathematics ,020208 electrical & electronic engineering ,Astrophysics::Instrumentation and Methods for Astrophysics ,MINIMUM NOISE VARIANCE ,020206 networking & telecommunications ,Charge (physics) ,READOUT NOISE ,Computer Science Applications ,Electronic, Optical and Magnetic Materials ,Filter (video) ,OPTIMAL FILTERING ,Node (circuits) - Abstract
This article provides a practical design methodology to calculate an optimal filter for noise reduction in the readout of charge‐coupled devices (CCDs) taking into account the charge transfer and feedthroughs due to capacitive coupling in the CCD. A detailed analysis of the dynamics of the video signal and charge transfer is presented, including the circuital modeling of the output stage of the CCD and the dynamics of the electronics in the video chain before the analog‐to‐digital (AD) converter. This model is used to compute an optimal filter that minimizes the variance of the pixel noise and uses the samples of the charge transfer, before the charge is fully settled. This is necessary to enhance the performance of previous results that also use optimal filters but do not use the transition samples, while also reducing the pixel readout time, resulting in faster readouts. As a proof of concept for the optimal filter, we present novel experimental results using a Skipper CCD, which has a floating sense node that allows to measure the charge packet an arbitrary number of times. However, this technique can be applied to any CCD that has a readout system that digitally samples the video signal. Fil: Chierchie, Fernando. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Investigaciones en Ingeniería Eléctrica "Alfredo Desages". Universidad Nacional del Sur. Departamento de Ingeniería Eléctrica y de Computadoras. Instituto de Investigaciones en Ingeniería Eléctrica "Alfredo Desages"; Argentina Fil: Fernández Moroni, Guillermo. Fermi National Accelerator Laboratory; Estados Unidos. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Investigaciones en Ingeniería Eléctrica "Alfredo Desages". Universidad Nacional del Sur. Departamento de Ingeniería Eléctrica y de Computadoras. Instituto de Investigaciones en Ingeniería Eléctrica "Alfredo Desages"; Argentina Fil: Querejeta Simbeni, Pedro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Investigaciones en Ingeniería Eléctrica "Alfredo Desages". Universidad Nacional del Sur. Departamento de Ingeniería Eléctrica y de Computadoras. Instituto de Investigaciones en Ingeniería Eléctrica "Alfredo Desages"; Argentina Fil: Stefanazzi, Leandro. Fermi National Accelerator Laboratory; Estados Unidos. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Investigaciones en Ingeniería Eléctrica "Alfredo Desages". Universidad Nacional del Sur. Departamento de Ingeniería Eléctrica y de Computadoras. Instituto de Investigaciones en Ingeniería Eléctrica "Alfredo Desages"; Argentina Fil: Paolini, Eduardo Emilio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Investigaciones en Ingeniería Eléctrica "Alfredo Desages". Universidad Nacional del Sur. Departamento de Ingeniería Eléctrica y de Computadoras. Instituto de Investigaciones en Ingeniería Eléctrica "Alfredo Desages"; Argentina. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas; Argentina Fil: Sofo Haro, Miguel Francisco. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; Argentina. Fermi National Accelerator Laboratory; Estados Unidos. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Cancelo, Gustavo Indalecio. Fermi National Accelerator Laboratory; Estados Unidos Fil: Estrada, Juan. Fermi National Accelerator Laboratory; Estados Unidos
- Published
- 2020
93. Teleneurology Consultations for Prognostication and Brain Death Diagnosis
- Author
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Marcelo Matiello, Lee H. Schwamm, Uma Girkar, Juan Estrada, Rafael Palacios, Amar Gupta, Hanna May, Cindy Whitney, and Pooja Singla
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Coma ,Brain Death ,medicine.medical_specialty ,Death diagnosis ,Telemedicine ,Neurology ,business.industry ,Remote Consultation ,Apnea testing ,Reproducibility of Results ,Apnea ,Health Informatics ,General Medicine ,Telehealth ,Intensive care unit ,law.invention ,Health Information Management ,law ,Humans ,Medicine ,medicine.symptom ,business ,Intensive care medicine - Abstract
The diagnosis of brain death and the determination of neurologic prognosis following cardiac arrest are important reasons for neurology consultation in the intensive care unit. In hospitals without access to neurology consultation, it may be challenging to address these important questions with high reliability in a timely manner. The American Academy of Neurology has established consensus criteria for diagnosis of brain death, which include (i) comatose state; (ii) presence of apnea; and (iii) absence of brainstem reflexes in the setting of a diagnosis of underlying brain injury compatible with brain death. It has recently been shown that virtual assessment of coma using standardized scales is feasible with good inter-rater reliability. The supervision of apnea testing and the neurologic examination of the brainstem by a remote neurologist are possible if conducted in conjunction with a well-trained and experienced bedside team. In this communication, we explore the essential clinical and legal framework that can support using virtual teleconsultations to address this complex topic.
- Published
- 2020
94. The climatic response of baldcypress (Taxodium mucronatum Ten.) in San Luis Potosi, Mexico
- Author
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Julián Cerano-Paredes, Laura E. Beramendi-Orosco, Rosalinda Cervantes-Martínez, Aldo R. Martínez-Sifuentes, Claudia C. Astudillo-Sánchez, Matthew D. Therrell, José Villanueva-Díaz, D. W. Stahle, and Juan Estrada-Ávalos
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Hydrology ,010506 paleontology ,geography ,geography.geographical_feature_category ,010504 meteorology & atmospheric sciences ,Ecology ,biology ,Physiology ,Forestry ,Wetland ,Plant Science ,Subtropics ,biology.organism_classification ,01 natural sciences ,Taxodium ,Water balance ,Habitat ,Tributary ,Environmental science ,Precipitation ,0105 earth and related environmental sciences ,Riparian zone - Abstract
Baldcypress, a long-lived species of riparian habitats, is sensitive to interannual climate variability. The annual radial growth is associated with the Standardized Precipitation Evaporation Index (SPEI) and Palmer Drought Severity Index (PDSI), both depending on a water balance. The baldcypress (Taxodium mucronatum Ten.) is a long-lived species and Mexico’s national tree. The objective of this study was to analyze the dendroclimatic response of baldcypress at sites located on the transitional zone between the semiarid and subtropical regions of Mexico, known as the Middle Zone of the state of San Luis Potosi, Mexico. The first site, Los Peroles (LPO), is a wetland where the oldest known baldcypress specimens in Mexico are found. The second site, Rio Verde (RVDE), is a riparian site located along a tributary of the Moctezuma River that drains into the Gulf of Mexico. Two ring-width chronologies were analyzed. The first one from LPO with a length of 633 years and the second one from RVDE with a length of 423 years. The species responded positively to the seasonal January–July precipitation (r = 0.52, p = 0.001) and negatively to the maximum monthly temperature of January, May, and June (r = − 0.42, −0.46, and −0.34; respectively). The average chronology was significantly associated with the mean January–August Standardized Precipitation Evaporation Index (SPEI) (r = 0.62, p = 0.000). An SPEI reconstruction was developed for the period 1575–1996 where the most prolonged and severe droughts were found at 70-year peaks in the El Nino Southern Oscillation frequency band. The annual radial growth of the species is a suitable indicator of the January–August water availability, and is important information that can be used to establish water management strategies for this semiarid environment and to preserve millennial baldcypress specimens.
- Published
- 2020
95. Aplicación de sistemas de información geográfica y sensoría remota en el seguimiento del avance de riego en un módulo del distrito de riego 017 Región Lagunera
- Author
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Carlos Miguel Ramos Cruz, Juan Estrada-Ávalos, Gerardo Delgado-Ramírez, Emilia Raquel Pérez-Evangelista, and Ignacio Orona-Castillo
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Mechanical Engineering ,Energy Engineering and Power Technology ,Management Science and Operations Research - Abstract
Los sistemas de información geográfica (SIG) y de percepción remota (PR) ayudan en el manejo y análisis de la información en los distritos de riego (DR). Por tal motivo, el objetivo del presente estudio fue generar un SIG y dar seguimiento al avance de riego superficial de un módulo del distrito de riego 017 Región Lagunera, México. Para esto, se integró un SIG a partir de topografía de precisión, y se utilizaron diez imágenes del satélite Landsat 8. Los resultados indican que la red principal tiene 19.5 por ciento de menor longitud en el canal lateral derecho (CLD) 57+839, de acuerdo con las cifras oficiales. Los principales cultivos sembrados fueron algodón (35.7%) y nogal (34.3%); asimismo, se identificó 24.2 por ciento de superficie excedente. Los SIG y PR facilitan el seguimiento del avance de riego en el módulo, lo cual contribuye a realizar un uso eficiente del agua.
- Published
- 2022
96. Preserving twin-beams spatial correlations with Skipper-CCD detection
- Author
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Agustina G. Magnoni, Muriel Bonetto, Juan Estrada, Javier Tiffenberg, Miguel A. Larotonda, and Dario Rodrigues
- Abstract
In this work, we study the potential of using a Skipper-CCD detector in a twin-beam source for preserving spatial correlations. An improvement in the noise reduction factor is predicted and preliminary experimental results are presented.
- Published
- 2022
97. Smart Readout of Nondestructive Image Sensors with Single Photon-Electron Sensitivity
- Author
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Fernando Chierchie, Guillermo Fernandez Moroni, Leandro Stefanazzi, Eduardo Paolini, Javier Tiffenberg, Juan Estrada, Gustavo Cancelo, and Sho Uemura
- Subjects
image sensor ,purl.org/becyt/ford/2 [https] ,low redout noise ,General Physics and Astronomy ,Single-photon ,purl.org/becyt/ford/2.2 [https] ,smart redout - Abstract
Image sensors with nondestructive charge readout provide single-photon or single-electron sensitivity, but at the cost of long readout times. We present a smart readout technique to allow the use of these sensors in visible light and other applications that require faster readout times. The method optimizes the readout noise and time by changing the number of times pixels are read out either statically, by defining an arbitrary number of regions of interest in the array, or dynamically, depending on the charge or energy of interest in the pixel. This technique is tested in a Skipper CCD showing that it is possible to obtain deep subelectron noise, and therefore, high resolution of quantized charge, while dynamically changing the readout noise of the sensor. These faster, low noise readout techniques show that the skipper CCD is a competitive technology even where other technologies such as electron multiplier charge coupled devices, silicon photo multipliers, etc. are currently used. This technique could allow skipper CCDs to benefit new astronomical instruments, quantum imaging, exoplanet search and study, and quantum metrology. Fil: Chierchie, Fernando. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Investigaciones en Ingeniería Eléctrica "Alfredo Desages". Universidad Nacional del Sur. Departamento de Ingeniería Eléctrica y de Computadoras. Instituto de Investigaciones en Ingeniería Eléctrica "Alfredo Desages"; Argentina Fil: Fernández Moroni, Guillermo. Fermi National Accelerator Laboratory; Estados Unidos. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Investigaciones en Ingeniería Eléctrica "Alfredo Desages". Universidad Nacional del Sur. Departamento de Ingeniería Eléctrica y de Computadoras. Instituto de Investigaciones en Ingeniería Eléctrica "Alfredo Desages"; Argentina Fil: Stefanazzi, Leandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Investigaciones en Ingeniería Eléctrica "Alfredo Desages". Universidad Nacional del Sur. Departamento de Ingeniería Eléctrica y de Computadoras. Instituto de Investigaciones en Ingeniería Eléctrica "Alfredo Desages"; Argentina. Fermi National Accelerator Laboratory; Estados Unidos Fil: Paolini, Eduardo Emilio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Investigaciones en Ingeniería Eléctrica "Alfredo Desages". Universidad Nacional del Sur. Departamento de Ingeniería Eléctrica y de Computadoras. Instituto de Investigaciones en Ingeniería Eléctrica "Alfredo Desages"; Argentina Fil: Tiffenberg, Javier Sebastian. Fermi National Accelerator Laboratory; Estados Unidos. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Estrada, Juan. Fermi National Accelerator Laboratory; Estados Unidos Fil: Cancelo, Gustavo Indalecio. Fermi National Accelerator Laboratory; Estados Unidos Fil: Uemura, Sho. Universitat Tel Aviv; Israel
- Published
- 2021
98. Nanoscale Zinc Oxide Particles for Improving the Physiological and Sanitary Quality of a Mexican Landrace of Red Maize
- Author
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Juan Estrada-Urbina, Alejandro Cruz-Alonso, Martha Santander-González, Abraham Méndez-Albores, and Alma Vázquez-Durán
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ZnO nanoparticles ,native maize seed ,physiological and sanitary quality ,Chemistry ,QD1-999 - Abstract
In this research, quasi-spherical-shaped zinc oxide nanoparticles (ZnO NPs) were synthesized by a simple cost-competitive aqueous precipitation method. The engineered NPs were characterized using several validation methodologies: UV–Vis spectroscopy, diffuse reflection UV–Vis, spectrofluorometry, transmission electron microscopy (TEM), nanoparticle tracking analysis (NTA), and Fourier transform infrared (FTIR) spectroscopy with attenuated total reflection (ATR). A procedure was established to coat a landrace of red maize using gelatinized maize starch. Each maize seed was treated with 0.16 mg ZnO NPs (~7.7 × 109 particles). The standard germination (SG) and accelerated aging (AA) tests indicated that ZnO NP-treated maize seeds presented better physiological quality (higher percentage of normal seedlings) and sanitary quality (lower percentage of seeds contaminated by microorganisms) as compared to controls. The application of ZnO NPs also improved seedling vigor, correlated to shoot length, shoot diameter, root length, and number of secondary roots. Furthermore, shoots and roots of the ZnO NP-treated maize seeds showed a marked increment in the main active FTIR band areas, most notably for the vibrations associated with peptide-protein, lipid, lignin, polysaccharide, hemicellulose, cellulose, and carbohydrate. From these results, it is concluded that ZnO NPs have potential for applications in peasant agriculture to improve the quality of small-scale farmers’ seeds and, as a result, preserve germplasm resources.
- Published
- 2018
- Full Text
- View/download PDF
99. Searching for Dark Particles with Quantum Optics
- Author
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Roni Harnik, Juan Estrada, Matias Senger, and Dario Rodrigues
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Physics ,Quantum optics ,Photon ,Physics beyond the Standard Model ,General Engineering ,Physics::Optics ,Quantum imaging ,Signal ,Computational physics ,Photon entanglement ,Optical medium ,General Earth and Planetary Sciences ,Quantum information science ,General Environmental Science - Abstract
We propose a way to use optical tools from quantum imaging and quantum communication to search for physics beyond the standard model. Spontaneous parametric down-conversion (SPDC) is a commonly used source of entangled photons in which pump photons convert to a signal-idler pair. We propose to search for “dark-SPDC” (dSPDC) events in which a new dark-sector particle replaces the idler. Though it does not interact, the presence of a dark particle can be inferred by the properties of the signal photon. Examples of dark states include axionlike particles and dark photons. We show that the presence of an optical medium opens the phase space of the down-conversion process, or decay, which would be forbidden in a vacuum. Search schemes are proposed that employ optical imaging and/or spectroscopy of the signal photons. The signal rates in our proposal scales with the second power of the small coupling to new physics, as opposed to light-shining-through-wall experiments, the signal of which scales with coupling to the fourth power. We analyze the characteristics of the optical media needed to enhance dSPDC and estimate the rate.
- Published
- 2021
100. CONILL SANCHO, JESÚS, Horizontes de economía ética
- Author
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Juan Estrada
- Subjects
Philosophy. Psychology. Religion ,Philosophy (General) ,B1-5802 - Published
- 2015
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