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Search Results: 1 - 10 of 28939 matches for " Federico Godínez "
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Comparación de dos protocolos de sincronización del estro en vaquillas de carne con distintas calificaciones de tracto reproductivo
Quezada Casasola,Andrés; Ramírez Godínez,Alejandro; Pérez Casio,Federico; Avenda?o Reyes,Leonel; Hallford,Dennis M.;
Interciencia , 2004,
Abstract: to compare the effect of two estrus synchronization protocols (mga?+pgf2a and crestar?) in beef heifers, 28 animals 15-18 months of age were classified according to their reproductive tract scoring (rts) in a: rts 2-3 (n=14), and b: rts 4-5 (n=14). a and b were subdivided forming four groups of seven heifers each for the application of: mga?+pgf2a with rts a (1a) or b (1b); crestar? with rts a (2a) or b (2b). the first protocol included mga? for 14d followed by pgf2a i.m. 19d afterwards. the second included 5mg of estradiol valerate and 3mg of norgestomet i.m., along with an implant with 3mg s.c. of norgestomet for 9d. when both protocols ended, heifers were artificially inseminated at detected estrus. variables evaluated were estrus presentation in response to protocol, time from end of protocol to onset of estrus, pregnancy rate at first synchronized estrus, pregnancy rate at the end of programmed breeding season, and the ability to induce ovarian activity in non-cycling heifers. statistical analyses consisted of "t" student, chi-square and exact fisher tests. group 1b showed higher (p<0.10) estrous response rate (100%) than all other groups (85.7%). time from end of protocol to onset of estrus was shorter (p<0.05) in group 2b (34 ±9.03h) than in the other groups; however, it was higher (p<0.05) for protocol mga?+pgf2a (69.2 ±14.8h) than crestar? (49 ±31.7h). the protocol mga?+pgf2a had higher (p<0.05) induction of ovarian activity in non-cycling heifers than crestar? (100 vs 14.2%). both protocols presented similar (p>0.10) pregnancy rate at first synchronized estrus (61.5 and 58.3% for mga?+pgf2a and crestar? respectively); however, group 1b (85.7%) had a higher rate (p<0.10) than groups 1a (33%), 2b (66.6%) and 2a (50%). pregnancy rate at the end of programmed breeding season was similar (p>0.10) in all groups. it is concluded that protocol mga?+pgf2a had a higher capacity to initiate ovarian activity in non-cycling heifers, and can be used more efficiently in
Sobre delicado, grave y reservado
Guillermo Murillo Godínez
Panace@ : Revista de Medicina, Lenguaje y Traducción , 2010,
Abstract:
Substratos modificados con monocapas autoensambladas: dispositivos para fabricar sensores y estudiar procesos químicos y fisicoquímicos interfaciales
Luis A. Godínez
Revista de la Sociedad Química de México , 1999,
Abstract: En este artículo se describen brevemente la naturaleza, las técnicas de preparación y algunas de las aplicaciones que las Monocapas Auto-Ensambladas (MAEs) han encontrado en el campo de la investigación fundamental. El arreglo ordenado y compacto de grupos funcionales específicos que caracteriza a las MAEs, ha permitido el dise o de dispositivos para estudiar en detalle algunas de las propiedades químicas y fisicoquímicas que controlan una variedad importante de eventos interfaciales. Entre los reportes que se discuten en este trabajo, destacan la investigación de reacciones orgánicas superficiales, el estudio detallado de procesos de transferencia electrónica y la caracterización de interacciones no covalentes interfaciales. En términos de innovación tecnológica, se se ala también que los sistemas basados en MAEs poseen un gran potencial en el desarrollo de superficies biocompatibles, dispositivos cromatográficos, substratos que liberen gradualmente principios activos y en el dise o y construcción de sensores electroquímicos basados en conceptos de reconocimiento molecular.
Nuevas metodologías en ense anza de la traducción: Una perspectiva cognitiva
José Cortez Godínez
Mutatis Mutandis : Revista Latinoamericana de Traducción , 2009,
Abstract: A principios del a o 2005, y dentro del marco del Programa de Posgrado en Traducción e Interpretación que impartió la Universidad de Granada, en Mexicali, inicié una investigación con el objetivo de observar el proceso de traducción per se, y conocer la conducta y el desarrollo de la pericia del traductor novicio, frente a una situación real de traducción. Buscamos registrar las probables manifestaciones externas de su cognición a la hora de estar insertos en el proceso traductivo, tales como la toma de decisiones y resolución de problemas mediante el registro de estrategias metacognitivas, a saber, aprendizaje colaborativo y recíproco y tutorías de grupo. Además intenté verificar si los conocimientos generales sobre lo que llamamos Protocolo Previo de Traducción (PPT) se aplican de manera sistemática, antes del inicio de la traducción de textos, afectando positivamente el desarrollo ulterior del aprendiz-traductor.
Parametrization to Improve the Solution Accuracy of Problems Involving the Bi-Dimensional Dirac Delta in the Forcing Function  [PDF]
Enrique J. Chicurel-Uziel, Francisco A. Godínez
Journal of Applied Mathematics and Physics (JAMP) , 2015, DOI: 10.4236/jamp.2015.39144
Abstract: The representation of the Dirac delta, obtained by differentiating the parametric equation of the unit step with a riser, is used to solve two examples referring to problems of a different physical nature, each with the product of two deltas as a forcing function. Each problem was solved by an entirely different procedure. In comparison with non-parametric solutions, the present solutions are both more accurate and truer representations of the physics involved.
Quimioprofilaxis para evitar la colonización materna por estreptococo grupo B: consecuencias de no adoptar la recomendación internacional
Reyna-Figueroa,Jesús; Ortiz-Ibarra,Federico Javier; Pérez-Antonio,Beatriz; Navarro-Godínez,Sujey; Casanova-Román,Gerardo; García-Carrillo,Laura Erika;
Salud Pública de México , 2008, DOI: 10.1590/S0036-36342008000200009
Abstract: objective: to know the criteria which determine the chemoprophylaxis on pregnant women colonized by streptococcus agalactiae (gbs) and the impact in our environment. material and methods: a retrospective analysis, identifying pregnant women with isolation of streptococcus agalactiae on screening cultures, cervical swabs and urine culture. two groups were analyzed, group 1 received chemoprophylaxis, and group 2 without chemoprophylaxis. chi square was used to asses the difference between proportions. chi square approximation to poisson distribution was used to compare the means of neonatal infection. results: a total of 274 cultures were reported with gbs isolation, on 261 patients; 165 (60.2%) cervical swabs, 109 (39.7%) urine culture and 13 patients from 274 (4.7%) had positive culture on both specimens. of this 261 patients, 53 (5.6%) received chemoprophylaxis during labor (p<0.05). the cdc criteria were followed accuracy on 29.2%. conclusions: there have not been established criteria for screening colonization by gbs in mexican pregnant women.
Colectores de algas de México (1787-1954)
Godínez Ortega, José Luis;
Acta botánica mexicana , 2008,
Abstract: biographical as well as bibliographical information is provided about the collectors of algae in mexico during the period 1787-1954. the data were obtained by consulting domestic and foreign herbaria, direct communication with the curators, and revision of relevant literature. information was found concerning 51 collectors, mainly of european and american origin; material collected by them was deposited in 16 herbaria: eight in europe, seven in america and one in australia. the work of collectors gathers information of the phyla: cyanobacteria, rhodophyta, ochrophyta (including phaeophyceae and xanthophyceae), bacillariophyta, chlorophyta and charophyta, the best represented being bacillariophyta and rhodophyta. dates and locations of the regions surveyed in 26 states are included. in the period covered by the study about 477 new species were discovered.
Causalidad del precio futuro de la Bolsa de Chicago sobre los precios físicos de maíz blanco en México
Godínez Placencia, José Alberto;
Estudios sociales (Hermosillo, Son.) , 2007,
Abstract: since 1993 the mexican federal government, through the agency called apoyos y servicios a la comercialización agropecuaria (aserca), has been using futures and options from the chicago board of trade (cbot) to hedge the white corn spot prices risk. the international hedging is effective if there is a causal leadership of the us # 2 yellow corn futures prices over the mexican white corn spot prices. however, the results of the procedures of the auto regression vector model (impulse-response function, variance decomposition, and granger causality) rejected this conditional statement for the weekly prices included in the period between 1998 and 2005.
La inserción de las mujeres en las carreras de ingeniería y tecnología
Razo Godínez, Martha Laura;
Perfiles educativos , 2008,
Abstract: mexico has experienced a relevant rise of the amount of women enrolled in higher education, even in degree studies traditionally considered as masculine. this article starts with a brief allusion to the recommendations set forth by international organizations and national policies to promote the enrollment of women in higher education. the second part tries to show how, at national level and only for undergraduate studies, a typically masculine area such as engineering has experienced the most important increase of the amount of women comparing to other areas and the mostly known as "feminine" courses. a third purpose is to finish off the differences in rise by federative entity based on two variables: preference and participation. several women were interviewed, who chose for that area and are enrolled at the universidad autónoma metropolitana - azcapotzalco. finally, the article outlines some hypotheses about this growth and guidelines in order to carry out the study at different levels and dimensions.
Colectores de algas de México (1787-1954)
José Luis Godínez Ortega
Acta botánica mexicana , 2008,
Abstract: Se presenta información biográfica y bibliográfica de los colectores de algas de México durante el período de 1787-1954. Los datos fueron obtenidos mediante la consulta de herbarios nacionales y extranjeros, la comunicación directa con los curadores de los mismos y la revisión de la bibliografía pertinente. Se encontraron 51 datos correspondientes a colectores, principalmente de origen norteamericano y europeo; el material colectado por los mismos fue depositado en 16 herbarios: ocho europeos, siete americanos y uno australiano. El trabajo de los colectores reúne información ficoflorística general de los phyla: Cyanobacteria, Rhodophyta, Ochrophyta (incluye Phaeophyceae y Xanthophyceae), Bacillariophyta, Chlorophyta y Charophyta; siendo los mejor representados Bacillariophyta y Rhodophyta. Se incluyen las fechas y localidades de las regiones estudiadas en 26 estados del país. En el periodo que abarca el estudio se descubrieron aproximadamente 477 nuevas especies.
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