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Search Results: 1 - 10 of 616669 matches for " Ana Laura;García Calderón "
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Aspectos reproductivos de una población del charal Menidia jordani (Woolman) del Lago de Metztitlán, Hidalgo
Ibá?ez, Ana Laura;García Calderón, José Luis;Torres-Orozco B., Roberto;
Hidrobiológica , 2008,
Abstract: menidia jordani is a silverside species naturally distributed in the mexican and lerma drainage areas and has in metztitlán lake it most eastern area of distribution in a lentic system. the analysis of the reproductive biology of this species showed that even metztitlán lake is the extreme frontier of their distribution conserved its reproduction phenology in relation with other populations. the highest standard length was 58 mm and the length at first sexual maturation was at 43 mm. sexual ratio inequality was manifested in mayor proportion of females during all collects with exception of january of 2004.
Aspectos reproductivos de una población del charal Menidia jordani (Woolman) del Lago de Metztitlán, Hidalgo Reproductive features of the "charal" Menidia jordani (Woolman) from Lake of Metztitlán, Hidalgo
Ana Laura Ibá?ez,José Luis García Calderón,Roberto Torres-Orozco B.
Hidrobiológica , 2008,
Abstract: Menidia jordani es una especie de charal que se distribuye de manera natural en las cuencas de México y del Río Lerma, y tiene en el Lago de Metztitlán, Hidalgo, el límite oriental de su área de distribución en ambientes lénticos. Los resultados del análisis de algunos aspectos de la biología reproductiva de la población de M. jordani que habita en el Lago de Metztitlán mostraron que, a pesar de vivir en un ambiente ubicado en la frontera de su área de distribución, conserva una fenología reproductiva similar a la de otras poblaciones. La máxima longitud estándar observada fue de 58 mm y la talla a la primera madurez sexual fue de 43 mm. Una notable desigualdad en la proporción de sexos a favor de las hembras se observó en todas las colectas, con excepción de la de enero del 2004. Menidia jordani is a silverside species naturally distributed in the Mexican and Lerma drainage areas and has in Metztitlán Lake it most eastern area of distribution in a lentic system. The analysis of the reproductive biology of this species showed that even Metztitlán Lake is the extreme frontier of their distribution conserved its reproduction phenology in relation with other populations. The highest standard length was 58 mm and the length at first sexual maturation was at 43 mm. Sexual ratio inequality was manifested in mayor proportion of females during all collects with exception of January of 2004.
Rese a de "Seguridad urbana y policía en Colombia" de Pablo Casas Dupuy, ángela Rivas Gamboa, Paola González Cepero y Hugo Acero Velásquez
Eduardo Bechara Gómez,Laura Calderón García
Revista Opera , 2009,
Abstract:
Determinación de paraquat en orina utilizando un sistema de inyección en flujo continuo
Luna,José Rafael; Di Bernardo,María Luisa; García,María Ysabel; Ovalles,Fernando; Calderón,Laura;
Acta bioqu?-mica cl?-nica latinoamericana , 2008,
Abstract: paraguat is a herbicide beloging to the bipyridinium group.the quantitative determination of paraquat in urine of humans is very important to diagnose survival of intoxicated patients. many hospitals use semi-quantitative tests for determining paraquat in biological samples. however, they often lack precision and accuracy. therefore, the development of simple, precise, accurate and accessible alternative methods could be very useful in hospital institutions. based on these considerations, a flow-injection spectrophotometric procedure is proposed for paraquat determination in urine samples. the determination is based on the formation of a coloured product (600 nm) after on-line reduction of paraquat with glucose in alkaline medium. under optimal conditions of operation, beer's law is obeyed in a concentration range of 1-50 μg ml-1 of paraquat with a correlation coefficient >0.999. the analytical frequency was 12 h-1 and the relative standard deviation was 2.8% for a sample solution containing 10 μg ml-1 paraquat (n=3). recovery studies were between 97.9 and 102.1%. the analytical method was satisfactorily applied in the analyses of samples from two intoxicated patients.
A six dimensional analysis of Maxwell's Field Equations
Ana Laura García-Perciante,Alfredo Sandoval-Villalbazo,L. S. García Colín
Physics , 2002,
Abstract: A framework based on an extension of Kaluza's original idea of using a five dimensional space to unify gravity with electromagnetism is used to analyze Maxwell\'{}s field equations. The extension consists in the use of a six dimensional space in which all equations of electromagnetism may be obtained using only Einstein's field equation. Two major advantages of this approach to electromagnetism are discussed, a full symmetric derivation for the wave equations for the potentials and a natural inclusion of magnetic monopoles without using any argument based on singularities.
Validez, fiabilidad y reproducibilidad de un test incremental en rampa en personas físicamente activas. Validity and reliability of an incremental ramp test for active persons.)
Benito Peinado, Pedro José,Francisco Javier Calderón Montero,Augusto García Zapico,Ana Belén Peinado Lozano
RICYDE : Revista Internacional de Ciencias del Deporte , 2005,
Abstract: Resumen La novedosa aparición de equipos de análisis de gases más sofisticados y precisos, obliga a los investigadores, como paso inicial de cualquier estudio más complejo, a la calibración y contraste de sus herramientas de medida. En el momento de comenzar este estudio los datos publicados prueban sin lugar a dudas la validez del equipo de análisis de gases Oxicon Pro (Carter y col., 1999:49, Rietjens y col., 2001, Koskolou y Geladas, 2002), pero no ha sido probada la reproducibilidad de las pruebas con este equipo y el protocolo que aquí proponemos. Con este fin se realizaron pruebas test-retest a un grupo de sujetos físicamente activos (Estudiantes de Educación Física el INEF de Madrid). Se estudiaron 10 sujetos físicamente activos, (características en tabla I) a los que se realizó dos pruebas de esfuerzo en cicloergómetro. El protocolo en rampa, aumentaba 5 vatios cada 12 segundos (25 vatios·min- 1) con un calentamiento de 3 minutos se aplicaba hasta que se cumplió, al menos dos de los criterios habituales para el cese de la prueba. Los resultados (tablas IV a VIII) nos indican la alta correlación entre las variables en las dos pruebas realizadasoscilando entre r = 0,60 y r = 0,99 y coeficiente de determinación para el VO2, VCO2 y la Carga que fueron de r2 = 0,95 0,94 y 0,97 respectivamente. Solo en dos variables se encontraron diferencias significativas entre la prueba 1 y 2. Esto fue en la producción máxima de VCO2 y en el umbral aeróbico expresado en frecuencia cardiaca. Estas diferencias pueden ser debidas a la mayor carga desarrollada en la 2a prueba, aunque estas no sean significativas. No se encontraron correlaciones entre variables de rendimiento como VO2 máx. , VO2/kg; W y W/kg y las variables de recuperación. En conclusión, las variables estudiadas nos ofrecen bastante fiabilidad sobre el protocolo y equipo utilizados en nuestro estudio. Con esto queda probada la fiabilidad y reproducibilidad del test, la validez alcanzada es de contenido y queda justificada por su inclusión habitual en la determinación de los umbrales en ejercicio en la bibliografía (Yamamoto y col., 1991, Ribas y col., 1994, Chicharro y col., 1995, Lucia y col., 1999). The continuous apparition of new gas analysis equipment makes necessary and accurate calibration at the start of any new research. At the start of this study the validity of the Oxicon Pro analyser had already been proved (Carter et al. 1999:49, Koskolou y Geladas, 2002, Rietjens et al., 2001), but not the reproducibility of it with the protocol here proposed. With this aim test-retest trials were carr
Perception of risk for the use of pesticides in scholastic children, Villa Guerrero, Mexico State.
Ana M.Oviedo-Zú?iga,Miguel A. Karam-Calderón,Claudia Rodríguez García
RETEL : Revista de Toxicología en Línea , 2007,
Abstract: Nowadays, the use of pesticides is the main way to fight against pest, but its use brings some risks: for the health who is exposed to, for the rest of the population and for the environment. This study includes a general objective: that is the evaluation of risks perception of students (9 to 12 years' old in the Elementary School Alfredo del Mazo, Villa Guerrero, México State) with the use pesticides. It is remarkable that children live in the main municipality that produce flower in the state of México. Scholar population is related to productive activities mainly at home (backyards) though fumigations work, cut and bring flowers; this activity supports family economy and is not a work activity. Actor's experience allows to built the children' risk perception, in their opinions, economical issues are before health issues, even when they know the risk produced by pesticides as illness and death taking some protections in the wrong way and some others don't think that they need this measures.
Características clinicopatológicas y distribución del número de autopsias de pacientes fallecidos por coccidioidomicosis en un hospital de referencia del noreste de México
Calderón-Garcidue?as, Ana Laura;Pi?a-Osuna, Karina;Leal-Moreno, Ana María;López-Cárdenas, Adriana;Cerda-Flores, Ricardo M;
Gaceta médica de México , 2004,
Abstract: aims: 1. to describe clinical and pathologic characteristics of patients with coccidioidomycosis (cm) who died from 1983-2000 at a hospital in northeastern mexico, and 2, to know distribution of number of deaths due to cm per year and month. methods: from 4598 autopsies, 31 cases of cm were selected. clinical chart and autopsy protocols were examined. distribution of cases was analyzed by contingence table and kolmogorov-smirnov tests. results: there were 10 women and 21 men (aged 4 months to 60 years). in women, pregnancy was present in 40%ofcases. in men, chronic renal failure (crf) (38%) and aids (19%) were the pathologic conditions most frequently observed. variation in distribution of cases throughout 18 years was not observed (p > 0.05). conclusions: mortality due to cm was 0.67% and variation in number of deaths was not found. in this endemic area, cm must be included in differential diagnosis of patients with risk factors such as pregnancy, crf, and aids, especially if associated with pneumonia with miliary pattern or septicemia with splenomegaly.
Datos recientes de la distribución de la siembra de especies exóticas como base de la producción pesquera en aguas interiores mexicanas
Ibá?ez, Ana L.;Espinosa-Pérez, Héctor;García-Calderón, José L.;
Revista mexicana de biodiversidad , 2011,
Abstract: federal government produced around 780 millions of fry belonging to 22 taxa during 2001-2009 which were stocked in mexican reservoirs basically to enhance fisheries. with official information from the federal fisheries agency conapesca stocking-production analysis for the fish farms from the federal government was studied at state level. we review stocking-yield relationship at state level. from the 22 taxa: 19 are fish (7 native species) and 2 subspecies; 2 native amphibious and 1 malay crustacean. production mean for nine-year period was 86.7 ± 37.9 millions of fry, 90% of which were tilapias and carps while only 3% were native species. stocking/ha vs yield/ha were clearly related, thus at more stocking rate more production was obtained arriving to an asintotic value. at present, federal government policy don’t allow to stock exotic species in natural water bodies, nevertheless they stay there because of previous or local stocking events.
Datos recientes de la distribución de la siembra de especies exóticas como base de la producción pesquera en aguas interiores mexicanas Recent data on the distribution of the exotic species used in Mexican freshwater fisheries based on fish stocking
Ana L. Ibá?ez,Héctor Espinosa-Pérez,José L. García-Calderón
Revista mexicana de biodiversidad , 2011,
Abstract: Durante los a os 2001-2009, el gobierno federal produjo 780 millones de crías pertenecientes a 22 taxa que se sembraron en cuerpos de agua interiores. El principal propósito de esta siembra fue la repoblación con fines pesqueros. Mediante información del mismo gobierno, se analiza la relación producción-siembra de crías de los Centros Piscícolas federales y su efecto en la producción pesquera estatal en aguas interiores mexicanas. Se plantea que esta producción está relacionada con la siembra de crías que llevó a cabo la Comisión Nacional de Acuacultura y Pesca (CONAPESCA), organismo desconcentrado del gobierno federal. Lo anterior fue revisado al analizar la correspondencia entre la densidad de crías sembradas y los rendimientos pesqueros estatales. De los 22 taxa, 19 son especies de peces (7 nativas) y 2 son subespecies, 2 son anfibios nativos y 1 es un crustáceo malayo. En promedio, en el lapso, se sembraron anualmente 86.7 ± 37.9 millones de crías, de las que el 90% son tilapias y carpas, y sólo el 3% son especies nativas. La relación siembra/ha vs producción/ha muestra que a mayor densidad de siembra, se obtiene mayor rendimiento pesquero hasta alcanzar un valor asintótico. Si bien, el gobierno federal tiene actualmente por política no sembrar en cuerpos de agua naturales especies exóticas, éstas permanecen de siembras anteriores, o las siembran los gobiernos estatales o son de cultivos privados. Federal government produced around 780 millions of fry belonging to 22 taxa during 2001-2009 which were stocked in Mexican reservoirs basically to enhance fisheries. With official information from the federal fisheries agency CONAPESCA stocking-production analysis for the fish farms from the federal government was studied at state level. We review stocking-yield relationship at state level. From the 22 taxa: 19 are fish (7 native species) and 2 subspecies; 2 native amphibious and 1 Malay crustacean. Production mean for nine-year period was 86.7 ± 37.9 millions of fry, 90% of which were tilapias and carps while only 3% were native species. Stocking/ha vs Yield/ha were clearly related, thus at more stocking rate more production was obtained arriving to an asintotic value. At present, federal government policy don’t allow to stock exotic species in natural water bodies, nevertheless they stay there because of previous or local stocking events.
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