oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 7 )

2018 ( 34 )

2017 ( 27 )

2016 ( 31 )

Custom range...

Search Results: 1 - 10 of 22191 matches for " Manuel;Velásquez-Valle "
All listed articles are free for downloading (OA Articles)
Page 1 /22191
Display every page Item
"CEZAC 06": nueva variedad de ajo tipo Jaspeado para la región norte centro de México
Reveles-Hernández, Manuel;Velásquez-Valle, Rodolfo;Alvarado Nava, María Dolores;Rubio-Díaz, Salvador;
Revista mexicana de ciencias agrícolas , 2011,
Abstract: about 5 200 hectares of garlic are cultivated in mexico; the north-central region is one of the main producing areas of this vegetable. the lack of locally adapted varieties of garlic is a serious disadvantage for garlic producers. in this paper are mentioned the main agronomic characteristics of "cezac 06", a new garlic variety available for producers of zacatecas, aguascalientes, durango, chihuahua and coahuila. the main advantages of this variety are higher yield, consistently round bulbs, fewer numbers of cloves per bulb and homogeneous maturation. in commercial plots, yield has improved in 9-17% and there have been achieved yields of up to 30 t ha-1 using "cezac 06".
"CEZAC 06": nueva variedad de ajo tipo Jaspeado para la región norte centro de México "CEZAC 06": new Jaspeado garlic cultivar for the northem-central region of Mexico
Manuel Reveles-Hernández,Rodolfo Velásquez-Valle,María Dolores Alvarado Nava,Salvador Rubio-Díaz
Revista mexicana de ciencias agrícolas , 2011,
Abstract: Alrededor de 5 200 hectáreas de ajo son cultivadas en México donde la región norte centro, es una de las principales áreas productoras de esta hortaliza. La falta de variedades de ajo localmente adaptadas es una seria desventaja para los productores de ajo. En este reporte se mencionan las principales características agronómicas de "CEZAC 06", una nueva variedad de ajo disponible para los productores de los estados de Zacatecas, Aguascalientes, Durango, Chihuahua y Coahuila. Las principales ventajas de esta variedad son rendimientos más altos, bulbos consistentemente redondos, menor número de dientes por bulbo y maduración homogénea. En parcelas comerciales el rendimiento se ha mejorado en 9-17% y se han alcanzado rendimientos de hasta 30 t ha-1 con el uso de "CEZAC 06". About 5 200 hectares of garlic are cultivated in Mexico; the north-central region is one of the main producing areas of this vegetable. The lack of locally adapted varieties of garlic is a serious disadvantage for garlic producers. In this paper are mentioned the main agronomic characteristics of "CEZAC 06", a new garlic variety available for producers of Zacatecas, Aguascalientes, Durango, Chihuahua and Coahuila. The main advantages of this variety are higher yield, consistently round bulbs, fewer numbers of cloves per bulb and homogeneous maturation. In commercial plots, yield has improved in 9-17% and there have been achieved yields of up to 30 t ha-1 using "CEZAC 06".
Microorganismos Benéficos Asociados a Meloidogyne incognita (Kofoid y White) Chitwood en Guayabo (Psidium guajava L.) de Calvillo, Aguascalientes, México
Gallegos-Morales, Gabriel;Cepeda-Siller, Melchor;Hernández-Castillo, Francisco Daniel;Acosta-Zamarripa, Ana María;Velásquez-Valle, Rodolfo;González-Gaona, Ernesto;Sánchez-Yánez, Juan Manuel;
Revista mexicana de fitopatología , 2009,
Abstract: the root-knot nematode species meloidogyne incognita was identified as the one species that parasites guava orchards in the calvillo region (aguascalientes, mexico). beneficent fungi and bacteria were isolated as well, associated to soil and roots collected from the cerro blanco, mesa grande, la labor and malpaso locations. twenty different meloidogyne sp., samples were identified taking adult female perinea pattern characteristics into account, as well as the male anterior region observation. the meloidogyne incognita species was identified in all the samples. the isolated beneficent microorganisms and associated to guava rhizosphere with a potential use in biological control, belong to the bacillus cereus, b. subtilis b. megaterium and paecilomyces farinosus species. furthermore, the rhabditis and mononchus soil nematodes were identified in the samples.
Incidencia y sintomatología de cinco virus en parcelas comerciales de chile seco en Aguascalientes, San Luis Potosí y Zacatecas, México
Velásquez-Valle, Rodolfo;Reveles-Torres, Luis Roberto;Mena-Covarrubias, Jaime;
Revista mexicana de ciencias agrícolas , 2012,
Abstract: world-wide the chili pepper crop is affected by more than 60 viral diseases, although very little is known about them in the area of dry pepper plantation in northern-central mexico. consequently, the aims of this work were to identify the presence of the virus and the associated symptoms in commercial dry pepper fields of the states of zacatecas, san luis potosí, and aguascalientes, mexico. mirasol and ancho pepper plants were sampled and the presence of symptoms such as dwarfing, chlorosis, leaf deformation, defoliation, vascular necrosis and joined branches, were recorded. samples were analyzed using das-elisa with the antisera of the tobacco mosaic virus (tobacco mosaic virus: tmv), cucumber mosaic virus (cucumber mosaic virus: cmv), potato virus y (potato virus y: pvy), pepper mottle virus (pepper mottle virus: pepmov), and tobacco etch virus (tobacco etch virus: tev). these viruses were identified in pepper plants collected in dry pepper fields located in the three states mentioned earlier.
Incidencia y sintomatología de cinco virus en parcelas comerciales de chile seco en Aguascalientes, San Luis Potosí y Zacatecas, México Incidence and symptomatology of five viruses in commercial dry chili pepper fields in Aguascalientes, San Luis Potosí, and Zacatecas, Mexico
Rodolfo Velásquez-Valle,Luis Roberto Reveles-Torres,Jaime Mena-Covarrubias
Revista mexicana de ciencias agrícolas , 2012,
Abstract: A nivel mundial el cultivo de chile es afectado por más de 60 enfermedades virales; sin embargo, poco se conoce acerca de ellas en el área productora de chile seco del norte centro de México por lo que el objetivo del presente trabajo consistió en detectar la presencia y sintomatología de cinco virus en parcelas comerciales de chile seco en los estados mencionados. Plantas de chile de los tipos mirasol y ancho fueron muestreadas y se anotó la presencia de síntomas como enanismo, clorosis, deformación de hojas, defoliación, necrosis vascular y ramas unidas. Las muestras fueron analizadas mediante la técnica DAS-ELISA empleando los antisueros para el virus del mosaico del tabaco (Tobacco mosaic virus: TMV), mosaico del pepino (Cucumber mosaic virus: CMV), Y de la papa (Potato virus Y: PVY), moteado del chile (Pepper mottle virus: PepMoV) y jaspeado del tabaco (Tobacco etch virus: TEV). Esos virus fueron identificados en plantas de chile colectadas en las parcelas comerciales de chile seco de los tres estados antes mencionados. World-wide the chili pepper crop is affected by more than 60 viral diseases, although very little is known about them in the area of dry pepper plantation in northern-central Mexico. Consequently, the aims of this work were to identify the presence of the virus and the associated symptoms in commercial dry pepper fields of the states of Zacatecas, San Luis Potosí, and Aguascalientes, Mexico. Mirasol and ancho pepper plants were sampled and the presence of symptoms such as dwarfing, chlorosis, leaf deformation, defoliation, vascular necrosis and joined branches, were recorded. Samples were analyzed using DAS-ELISA with the antisera of the tobacco mosaic virus (Tobacco mosaic virus: TMV), cucumber mosaic virus (Cucumber mosaic virus: CMV), potato virus Y (Potato virus Y: PVY), pepper mottle virus (Pepper mottle virus: PepMoV), and tobacco etch virus (Tobacco etch virus: TEV). These viruses were identified in pepper plants collected in dry pepper fields located in the three states mentioned earlier.
Presencia de Circulifer tenellus Baker y Beet mild curly top virus en maleza durante el invierno en el centro norte de México Circulifer tenellus Baker and Beet mild curly top virus presence in weeds during the winter in north-central Mexico
Rodolfo Velásquez-Valle,Luis Roberto Reveles-Torres,Mario Domingo Amador-Ramírez,María Mercedes Medina-Aguilar
Revista mexicana de ciencias agrícolas , 2012,
Abstract: Una de las enfermedades más importantes del chile para secado en el norte centro de México es la denominada amarillamientos del chile. Existe poca información acerca de la interacción entre el vector (Circulifer tenellus Baker), el Beet mild curly top virus y la maleza durante el invierno en esta región, consecuentemente el objetivo del trabajo fue identificar maleza de invierno que sirve como refugio para el vector y hospedero del virus en esta región. Entre enero y marzo de 2011 se muestrearon 26 manchones de maleza en los estados de Aguascalientes y Zacatecas. Se capturaron adultos de C. tenellus en 69.2% de los manchones de maleza muestreados; la mayoría (75.5%) de los especímenes eran hembras. El Beet mild curly top fue identificado sólo 15.4% de los sitios de muestreo infectando especies de maleza como Eruca sativa, Reseda sp., Chenopodium sp. y Solanum rostratum L. One of the most important diseases of chili pepper for drying in the north-central Mexico is called yellowing of chili. There is little information about the interaction between the vector (Circulifer tenellus Baker), the Beet mild curly top virus and weeds during the winter in this region; therefore, the objective was to identify winter weeds that serve as are fuge for the vector and host of the virus in this region. Between January and March, 2011, 26 patches of weed were sampled in Aguascalientes and Zacatecas. Adult C. tenellus were captured in 69.2% of the weed sampled patches; most of the specimens were females (75.5%). Beet mild curly top was identified in only 15.4% of the sampling sites, infecting weed species suchas Eruca sativa, Reseda sp., Chenopodium sp. and Solanum rostratum L.
Mapping soil fractal dimension in agricultural fields with GPR
K. Oleschko, G. Korvin, A. Mu oz, J. Velazquez, M. E. Miranda, D. Carreon, L. Flores, M. Martínez, M. Velásquez-Valle, F. Brambila, J.-F. Parrot,G. Ronquillo
Nonlinear Processes in Geophysics (NPG) , 2008,
Abstract: We documented that the mapping of the fractal dimension of the backscattered Ground Penetrating Radar traces (Fractal Dimension Mapping, FDM) accomplished over heterogeneous agricultural fields gives statistically sound combined information about the spatial distribution of Andosol' dielectric permittivity, volumetric and gravimetric water content, bulk density, and mechanical resistance under seven different management systems. The roughness of the recorded traces was measured in terms of a single number H, the Hurst exponent, which integrates the competitive effects of volumetric water content, pore topology and mechanical resistance in space and time. We showed the suitability to combine the GPR traces fractal analysis with routine geostatistics (kriging) in order to map the spatial variation of soil properties by nondestructive techniques and to quantify precisely the differences under contrasting tillage systems. Three experimental plots with zero tillage and 33, 66 and 100% of crop residues imprinted the highest roughness to GPR wiggle traces (mean HR/S=0.15), significantly different to Andosol under conventional tillage (HR/S=0.47).
Atmósfera sociomoral en escuelas bogotanas desde una perspectiva de género
Manuel Ricardo Toro Velásquez
Nómadas , 2001,
Abstract: Este texto aborda la emergencia de las normas colectivas referidas a la acción moral (atmósfera socio-moral) en la escuela, con el fin de captar las diferencias y similitudes de éstas en las interacciones de chicos y chicas, profesores y profesoras. El lente que alimenta la concepción del análisis de los fenómenos es el del socioconstruccionismo. Por tanto, busca reconocer las diversas narrativas sobre lo moral que surgen de la observación de distintos ámbitos educativos, sobre el presupuesto de que dichas narrativas son diferentes, en cuanto al valor y significado de lo moral,dependiendo del género.This article approaches the emergence of collective rules that are related to moral action (socio-moral atmosphere) at school in order to capture the differences and similarities of such rules in the interactions among girls boys, and teachers. Since the analysis of these phenomena is based on Social Constructivism, its aim is to identify diverse narratives about morality, which arise from the observation of different educational environments; this observation is based on the assumption that these narratives are different in terms of the value and meaning morality has, depending on gender.
Nuevos disruptores endocrinos: su importancia en la población pediátrica
González,Alejandro Román; Alfaro Velásquez,Juan Manuel;
Iatreia , 2005,
Abstract: changes in the environment that have taken place during the last 40 years have generated frequent contacts with natural and synthetic chemical products with potential endocrine-disrupting roles; among them: the intensive use of pesticides after the introduction of ddt, the petrochemical derivatives of the plastic industry, the synthetic medicines and the growing market of clothes, cleaning products, cosmetics and motor vehicles. in every one of these groups there are signals of an endocrine-disrupting activity, whether direct or indirect. initial controversy dealt with products chemically similar to estrogens and with those with antiandrogenic and antithyroid activity because of their suspected harmful activity on dna; more recently, new substances and life conditions have been introduced in the list of endocrine disruptors; although such substances do not damage the genome, they interact in inappropriate ways with enzymes and their metabolic pathways. among the potential harmful effects of these substances the following should be emphasized: intrauterine abnormalities due to damage of fetal tissues, changes of genital phenotype, several clinical manifestations during adolescence and potential effects on future generations. finally, there are substances that can modulate the endocrine and immune expressions of individuals as well as homeostasis, reproduction, development and behavior; they have effects on reproductive tissues, both male and female, fertility, thyroid function and the central nervous system.
Nuevos disruptores endocrinos: su importancia en la población pediátrica New endocrine disruptors: their importance in pediatric population
Alejandro Román González,Juan Manuel Alfaro Velásquez
Iatreia , 2005,
Abstract: Los cambios de nuestro hábitat en los últimos 40 a os han generado contactos frecuentes con sustancias químicas tanto naturales como sintéticas que funcionan como disruptores endocrinos; son ejemplos los pesticidas ampliamente usados tras la introducción del DDT, los derivados petroquímicos en la industria del plástico, las medicinas sintéticas, y el volumen creciente de artículos de vestuario, aseo, cosmética y transporte. En cada uno de los grupos anotados hay se ales de actividad de algún disruptor endocrino sea directamente o a través de sus derivados. La controversia inicial se centró principalmente en los compuestos químicamente similares a los estrógenos y en todos aquellos con actividad antiandrógenos o antitiroidea, debido a que se sospechaba que da aban el ADN; recientemente se han estudiado otros compuestos y condiciones de vida que no lesionan el genoma pero sí interactúan con enzimas y sus metabolitos. Entre los efectos potenciales de estas sustancias cabe mencionar los siguientes: anomalías intrauterinas por da os del tejido fetal en formación; cambios del fenotipo genital al nacer y diversas manifestaciones clínicas durante la adolescencia; además, no pueden perderse de vista los efectos sobre las generaciones futuras. Los disruptores endocrinos son compuestos que pueden modular tanto la expresión endocrina e inmune del afectado como la homeostasis, la reproducción, el desarrollo y el comportamiento y tienen efectos sobre los tejidos reproductivos masculino y femenino, la fertilidad, la función tiroidea y el sistema nervioso central. Changes in the environment that have taken place during the last 40 years have generated frequent contacts with natural and synthetic chemical products with potential endocrine-disrupting roles; among them: the intensive use of pesticides after the introduction of DDT, the petrochemical derivatives of the plastic industry, the synthetic medicines and the growing market of clothes, cleaning products, cosmetics and motor vehicles. In every one of these groups there are signals of an endocrine-disrupting activity, whether direct or indirect. Initial controversy dealt with products chemically similar to estrogens and with those with antiandrogenic and antithyroid activity because of their suspected harmful activity on DNA; more recently, new substances and life conditions have been introduced in the list of endocrine disruptors; although such substances do not damage the genome, they interact in inappropriate ways with enzymes and their metabolic pathways. Among the potential harmful effects of these substances t
Page 1 /22191
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.