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Search Results: 1 - 10 of 74115 matches for " José Alfredo;Amaya Carrillo "
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Evaluación de ácido acético como fumigante de mosquita blanca Bemisia tabaci (Gennadious) en laboratorio y campo
Samaniego Gaxiola, José Alfredo;Amaya Carrillo, José Emmanuel;Puente Manríquez, José Luis;
Revista mexicana de ciencias agrícolas , 2012,
Abstract: the aim of this work was to assess the capacity of acetic acid (aa) like fumigant against bemisia tabaci (silverleaf whitefly) which is a pest of national importance. in laboratory, the bug was fumigated with three doses-time regimes: (both media), low dose-long time and high dose-short time. in field, squash leaves of four varieties were fumigated with 8, 16 and 32 μg ml-1 of aa during of 20, 40 and 60 min; additionally, it was assessed damage in foils (phytotoxicity) after fumigation. in laboratory, fumigation time > 15 min and 8μgml-1 of aa killed 100% of whitefly, while its survival was reduced 40% when fumigated eight hours with 2 μml-1 of aa; but control incubation (whitefly without fumigation) during ≥ 16 h also reduced its survival; meanwhile, with 8 and 16 μgml-1 of aa the pest survival was reduced since five minutes (~20-80%). in field, the whitefly survived ~ 40% in leaves of four varieties afterfumigating with aa(8-32 μg ml1)during20min, but pest practically did not survive when increasing fumigation time to 60 min. the leaves showed severe damage (phytotoxicity) > to 50% except in dose of 8μg ml-1 at 20 min with damage of - 20%. alternative to use of aa like fumigant are discussed.
Evaluación de ácido acético como fumigante de mosquita blanca Bemisia tabaci (Gennadious) en laboratorio y campo Assessment of acetic acid like fumigant of silverleaf whitefly Bemisia tabaci (Gennadious) in laboratory and field
José Alfredo Samaniego Gaxiola,José Emmanuel Amaya Carrillo,José Luis Puente Manríquez
Revista mexicana de ciencias agrícolas , 2012,
Abstract: El objetivo de este trabajo fue evaluar la capacidad del ácido acético (AA) como fumigante en contra de Bemisia tabaci (moquita blanca) que es un plaga de importancia nacional. En el laboratorio, se fumigó el insecto con tres regímenes de dosis - tiempo: (ambos medios), baja - largos y altas - cortos. En el campo, las hojas de calabaza de cuatro variedades fueron fumigadas con 8, 16 y 32 μg ml-1 de AA en tiempos de 20, 40 y 60 min; adicionalmente, se evaluó el da o en las hojas (fitotoxicidad) después de fumigarse. En el laboratorio, tiempo de fumigación > 15 miny 8 μg ml-1 de AA mató 100% de la mosquita, mientras que, su supervivencia se redujo 40% al fumigarla ocho horas con 2 μg ml-1de AA; pero la incubación del testigo (mosquita sin fumigar) por ≥ 16 h también redujo su supervivencia; entretanto, con 8 y 16 μml-1 de AA se redujo la supervivencia del insecto desde los cinco minutos (~20-80%). En el campo, la mosquita sobrevivió ~ 40% en las hojas de las cuatro variedades después de fumigarse con AA(8-32 μgml-1) durante 20 min, pero el insecto prácticamente no sobrevivió al aumentar el tiempo de fumigación a 60 min. Las hojas mostraron un da o severo (fitotoxicidad) > al 50% excepto en la dosis de 8 μg ml-1 a los 20 min con un da o de ~ 20%. Se discuten alternativas del empleo del AA como fumigante. The aim of this work was to assess the capacity of acetic acid (AA) like fumigant against Bemisia tabaci (silverleaf whitefly) which is a pest of national importance. In laboratory, the bug was fumigated with three doses-time regimes: (both media), low dose-long time and high dose-short time. In field, squash leaves of four varieties were fumigated with 8, 16 and 32 μg ml-1 of AA during of 20, 40 and 60 min; additionally, it was assessed damage in foils (phytotoxicity) after fumigation. In laboratory, fumigation time > 15 min and 8μgml-1 of AA killed 100% of whitefly, while its survival was reduced 40% when fumigated eight hours with 2 μml-1 of AA; but control incubation (whitefly without fumigation) during ≥ 16 h also reduced its survival; meanwhile, with 8 and 16 μgml-1 of AA the pest survival was reduced since five minutes (~20-80%). In field, the whitefly survived ~ 40% in leaves of four varieties afterfumigating with AA(8-32 μg ml1)during20min, but pest practically did not survive when increasing fumigation time to 60 min. The leaves showed severe damage (phytotoxicity) > to 50% except in dose of 8μg ml-1 at 20 min with damage of - 20%. Alternative to use of AA like fumigant are discussed.
Stochastic Mean-Field Limit: Non-Lipschitz Forces \& Swarming
Fran?ois Bolley,José Alfredo Ca?izo,José Antonio Carrillo
Mathematics , 2010,
Abstract: We consider general stochastic systems of interacting particles with noise which are relevant as models for the collective behavior of animals, and rigorously prove that in the mean-field limit the system is close to the solution of a kinetic PDE. Our aim is to include models widely studied in the literature such as the Cucker-Smale model, adding noise to the behavior of individuals. The difficulty, as compared to the classical case of globally Lipschitz potentials, is that in several models the interaction potential between particles is only locally Lipschitz, the local Lipschitz constant growing to infinity with the size of the region considered. With this in mind, we present an extension of the classical theory for globally Lipschitz interactions, which works for only locally Lipschitz ones.
COMPONETES VOLáTEIS E SABOR DE MAM O (Carica papaya): UMA REAVALIA O
Maria Regina Bueno FRANCO,Delia RODRIGUEZ-AMAYA,Maria Helena DAMASIO,José Luiz LLANOS CARRILLO
Alimentos e Nutri??o , 2009,
Abstract: RESUMO: Os componentes voláteis de duas cultivares de mam o (Solo e Formosa) da mesma regi o geográfica (Bahia), e da mesma cultivar (Solo) de duas regi es geográficas distintas (Bahia e Pará), examinados durante o ano de 1991, mostraram uma grande variabilidade, o que exigiu uma repeti o do estudo para verificar a varia o em dois anos consecutivos. A cultivar Solo continuou apresentando uma alta porcentagem de linalol (até 94%), e o segundo constituinte mais abundante foi o óxido trans de linalol. Os lotes analisados da cultivar Formosa mostraram maior variabilidade, porém bem menor do que no ano de 1991. Esta cultivar mostrou uma maior propor o do óxido cis, e linalol foi o segundo componente majoritário. Em rela o aos ésteres de metila, butanoato variou de tra os até 17%, crotonato n o foi detectado, e hexanoato o foi no máximo como tra os. A composi o de voláteis da cultivar Solo da Bahia e do Pará n o diferiu significativamente. A análise descritiva quantitativa mostrou que a cultivar Solo possui aroma floral com sabor mais doce e de néctar. A cultivar Formosa apresentou um sabor mais amargo e mais aguado, com notas de verde. N o houve diferen as significativas no aroma dos mam es Solo e da Bahia e do Pará; entretanto, o do Pará foi considerado com um sabor de néctar mais acentuado. PALAVRAS-CHAVE: Aroma; compostos voláteis; análise sensorial; cromatografia gasosa; mam o.
Pitahaya (Hylocereus spp.): a short review
Yolanda Donají Ortiz-Hernández,José Alfredo Carrillo-Salazar
Comunicata Scientiae , 2012,
Abstract: Hylocereus is a native American cactus of varied habits and widely distributed from the Florida coast to Brazil. The fruit is known under several commercial and native names, but “pitahaya” or “pitaya” prevails all around. The genus contains 14 species and it is part of the subtropical and tropical American rainforests. It is common to find Hylocereus in family gardens in Central America, where it is traditionally used as food and medicine. Commercial plantations are distributed around the world due to its agronomic, industrial and economic importance. Hylocereus species cultivated around the world are mainly H. undatus, H. monacanthus and H. megalanthus. Research related to Hylocereus has increased significantly in the fields of taxonomy, anatomy, physiology, genetics, biochemistry, medicine, agronomy and industry, but there is still too much to do. This document describes part of Hylocereus history, technological advances and it provides perspectives of research and usage of this emerging crop.
Calidad fisiológica de semillas de Physalis ixocarpa en función de madurez a cosecha y condiciones de almacenamiento Physalis ixocarpa physiological seed quality in terms of maturity at harvest and storage conditions
Ignacio Pérez Camacho,Víctor Arturo González Hernández,óscar Javier Ayala Garay,José Alfredo Carrillo Salazar
Revista mexicana de ciencias agrícolas , 2012,
Abstract: El deterioro de la semilla durante el almacenamiento reduce su capacidad germinativa y el establecimiento de plántulas en campo. En semillas de Physalis ixocarpa Brot., se desconocen los niveles de los factores ambientales que afectan su longevidad germinativa y su desempe o fisiológico durante el almacenamiento, en función del estado de desarrollo a la cosecha. En esta investigación se evaluó semilla de la variedad Chapingo cosechada en tres estados de desarrollo (45, 55 y 65 días después de la polinización), en tres periodos de almacenamiento (0, 4 y 8 meses) combinados con cinco ambientes que incluyeron dos temperaturas (23.8 y 5.3 °C) y dos niveles de humedad relativa (24 y 81%). Se encontró que la semilla puede mantener su capacidad germinativa inicial (70%), por al menos durante 8 meses cuando se almacena en baja humedad relativa (24%) o en frío (5 °C), ya que la combinación de alta humedad relativa (81%) y temperatura de 23 °C causan el deterioro de la semilla. El deterioro se manifiesta en reducciones de germinación de 70 a 29%, viabilidad de 81 a 46%, velocidad de emergencia de radícula de 20.4 a 9.9 radículas por día, velocidad de emergencia de la parte aérea de 6.3 a 2.3 plántulas por día, respiración de 16.1 a6.6nmol CO2 g-1 s-1 y en un aumento en conductividad eléctrica de 32 a 97 μS cm-1 g-1. Las semillas de 55 días de edad ya han alcanzado la madurez fisiológica, pues germinan igual y con el mismo vigor que las semillas de 65 días. Las semillas inmaduras de 45 días ya poseen capacidad de germinar, aunque 10% menos que la semilla madura y con menor vigor. Seed deterioration during storage reduces germination and seedling establishment in the field. For Physalis ixocarpa Brot. seeds the levels of environmental factors that affect its germination longevity and physiological performance during storage, depending on the state of development at harvest are unknown. For this research, variety Chapingo seeds harvested at three stages of development were evaluated (45, 55 and 65 days after pollination), in three storage periods (0, 4 and 8 months) combined with five environments including two temperatures (23.8 and 5.3 °C) and two relative humidity levels (24 and 81 %). It was found that, the seeds can maintain its initial germination capacity (70%) for at least 8 months when stored under low relative humidity (24%) or cold (5 °C), since the combination of high relative humidity (81%) and temperature of 23 °C cause degradation in the seeds. The deterioration is manifested in reduced germination from 70 to 29%, viability from 81 to 46%, radicle rat
Evaluación de tres leguminosas como coberturas asociadas con maíz en el trópico subhúmedo
Castillo-Caamal,José Bernardino; Caamal-Maldonado,Jesús Arturo; Jiménez-Osornio,Juan José María; Bautista-Zú?iga,Francisco; Amaya-Castro,Manuel Jesús; Rodríguez-Carrillo,Rodrigo;
Agronomía Mesoamericana , 2010,
Abstract: evaluation of three legumes as cover crops with maize under subhumid tropic. the objective of this work was to evaluate the potential of three legumes as cover crops to improve maize production systems. four treatments were evaluated: 1) control, maize in monoculture; 2) maize - short-cycle, white seed lima bean (phaseolus lunatus); 3) maize - long cycle, white seed lima bean phaseolus lunatus), and 4) maize - velvet bean (mucuna sp.), in a randomized complete blocks design with four replications during four growing cycles (1999-2002), in yucatán, méxico. we measured: crop biomass, ph, total n, potential anaerobic mineralization of n, co2 evolution, potassium (k), phosphorus (p), and soil organic matter, and biomass and frequency of weeds. legume stubble residues accumulated on maize crops were: 3436, 3425 and 4018 kg dm/ha for the first, second and third year, respectively. nitrogen contributed by stubble material was 25.8, 31.9, 52.8, and 43.4 kg/ha in treatments 1, 2, 3, and 4, respectively. maize grain yield was 841, 843, and 460 kg dm/ha in the first, second and third year, respectively, without significant differences between treatments. during the third year, velvet bean caused a reduction in weed biomass from 126 to 58 g dm/m2. cover crops had little influence on soil variables and maize grain yield.
Potencial productivo, propiedades físicas y valor nutrimental de híbridos de maíz de alta calidad proteínica
Melesio Cuéllar, José Luis;Preciado Ortiz, Ricardo Ernesto;Terrón Ibarra, Arturo Daniel;Vázquez Carrillo, María Gricelda;Herrera Macías, Pedro;Amaya Guerra, Carlos Abel;Serna Saldívar, Sergio Othón;
Agricultura técnica en México , 2008,
Abstract: high yield potential maize hybrids with better quality protein might benefit mexican population who depends highly of tortilla as the main source of feeding. with the objective to comparing yield potential, agronomic performance, grain physical characteristics and protein quality, at bajio experiment station (celaya, guanajuato, mexico), belonging to the mexican forestry, agriculture and husbandry national institute (inifap) during summer 2003, 14 white quality protein maize (qpm) hybrids and two normal endosperm controls were planted. harvest grains were tested for bushel weight, 1 000 kernel weight, endosperm texture, grain shape, protein content, aminutoo acids, albuminuto/globulins and zeyns patterns. average grain yield was 11.1 t ha-1. qpm genotypes hec-424973, hec-864276, hec-774986, hec-867342, hec-734286 and hec-864542 had a mean grain yield of 12.6 t ha-1 while the controls h-358 and lince mean were 11.5 t ha-1. when compare with the controls, qpm genotypes had lower test weight (77.4 vs 76.5 kg hl-1) and 1 000 kernel weight (327 y 307 g), softer endosperm texture (2.5 vs 1.8, where 1= soft, 2 intermediate and 3 hard endosperm), lower protein content (10 vs 8%) and better quality protein and essential aminutoo acids content. when compared with the controls qpm genotypes had mean increments of 49% of lysine, 47% of tryptophan and 3 6% of albuminutos/globulins. the better combination of yield potential, agronomic performance, grain physical characteristics and protein quality were found in the experimental qpm hybrids hec-424973, hec-774986 y hec-734286. the response of these genotypes support the possibility to release as new commercial hybrids. therefore qpm hybrids with better potential used for commercial planting, will benefit farmers and consumers.
El olvido recobrado: sexualidad y políticas radicales en el Movimiento de Liberación Homosexual en Colombia
José Fernando Serrano Amaya
Revista CS , 2012,
Abstract: What was the meaning of “liberation” in the Homosexual Liberation Movement that emerged in Colombia at the end of the 1970s? El Otro, a homosexual magazine published at that time, is analyzed as a space where a particular discourse about sexuality took form based on the publication’s radical politics. In this discourse, the relationship between sexuality and liberation was understood as revolution, pragmatics, pedagogy and bond, however it became impossible to continue these countercultural liberation politics as rights discourses came to dominate the gay and lesbian movements in 1980s. Qué significaba “liberación” en el Movimiento de Liberación Homosexual colombiano surgido a finales de los setenta? Revisando el contenido de El Otro, una publicación homosexual de la época, se argumenta que allí se produjo un discurso sobre la sexualidad basado en políticas radicales de la misma. Allí, la relación entre sexualidad y liberación se entendió como revolución, pragmática, pedagogía y vínculo, a la manera de un discurso libertario y contracultural cuya continuidad se vio afectada por la preponderancia de la lógica de los derechos en los movimientos de gays y lesbianas de la década de los ochenta.
El aporte del diplomático sueco Hans Jacob Gahn (1748-1800) a la formación de la biblioteca de historia natural de José Celestino Mutis (1732-1808)
José Antonio Amaya
Historia Crítica , 1995,
Abstract: Se trata de profundizar en el estudio del papel que desempe ó la ciencia sueca en la implantación de la historia natural en el virreinato de la Nueva Granada durante la segunda mitad del siglo XVIII. Con tal fin se describe y analiza en esta ocasión la contribución de H. J. Gahn y de otros naturalistas suecos (Linneo padre e hijo, P. J. Bergius, etc.) a la formación de la Sección de Historia Natural de la Biblioteca de J. C. Mutis, director de la Real Expedición Botánica del Nuevo Reyno de Granada (1783-1816). Tal biblioteca se halla integrada al patrimonio nacional colombiano desde 1822. Se demuestra que Gahn llegó a convertirse en el principal consejero y asesor de aquella Expedición en materia de provisión de libros, desde 1783 hasta 1790 por lo menos. Se describen las circunstancias en que este protagonismo operó, las razones que lo explican, su alcance, limitaciones y expectativas. También se lo pone en paralelo con el papel de Madrid adonde Mutis gozaba de protección política más no de apoyo científico. Al final del trabajo se incluyen dos apéndices. En el Apéndice A se editan tres cartas inéditas de Gahn a Mutis. En el Apéndice B se levanta un Catálogo de libros procurados por los suecos. Este catálogo se halla acompa ado de comentarios relativos al conocimiento por Mutis de la edición, pedido del libro, proveedor, localización del ejemplar original o de algunas de sus copias, etc.
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