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Search Results: 1 - 10 of 700144 matches for " Jorge Alberto;Sánchez-García "
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Características agronómicas y contenido de Fe y Zn en el grano de frijol tipo Rosa de Castilla (Phaseolus vulgaris L.)
Jiménez-Hernández, Yanet;Acosta-Gallegos, Jorge Alberto;Sánchez-García, Bertha María;Martínez Gami?o, Miguel ángel;
Revista mexicana de ciencias agrícolas , 2012,
Abstract: the 'rosa de castilla' type bean is popular in areas of guanajuato, san luis potosí and zacatecas, where it is produced under rainfed conditions. the aim of this research was to compare the agronomic characteristics of 22 rc accessions with two bred cultivars of the flor de mayo type beans grown under rainfed conditions. the trial was established during 2008 under rainfall conditions in two locations in the state of guanajuato: celaya (1 785 masl) and ocampo (2 200 masl), as well as one in san luis potosí, in villa de arriaga (2 200 masl). a complete random block design was used. at the locations in guanajuato, phenological characteristics and reactions to diseases were established, and in all three locations, seed yield and the weight of 100 seeds were determined; also, the iron and zinc contents were established in one seed sample for each material. significant differences (p< 0.01) were observed for seed yield, weight of 100 seeds, and iron and zinc seed content for the effects of location, genotype and the interaction of both. throughout locations, the greatest yield, > 1 3 00 kg ha-1 was obtained by accessions rcg08001, rca06001 and rcz06001. the highest weight for 100 seeds was found in rcslp 08001, with 40.2 g. for mineral content, outstanding accessions were rcg 08011 and rcz06001 with > 65 and 40 ppm for fe and zn, respectively. in comparison to the checks, accessions displayed a long growth cycle and susceptibility to rust and halo blight.
Características agronómicas y contenido de Fe y Zn en el grano de frijol tipo Rosa de Castilla (Phaseolus vulgaris L.) Agronomic traits and Fe and Zn content in the grain of common Rosa de Castilla type bean (Phaseolus vulgaris L.)
Yanet Jiménez-Hernández,Jorge Alberto Acosta-Gallegos,Bertha María Sánchez-García,Miguel ángel Martínez Gami?o
Revista mexicana de ciencias agrícolas , 2012,
Abstract: El frijol de tipo Rosa de Castilla (RC) es popular en áreas de Guanajuato, San Luis Potosí y Zacatecas, donde se produce bajo temporal. El objetivo fue comparar características agronómicas de 22 colectas de tipo RC con dos variedades mejoradas de tipo Flor de Mayo (FM) bajo condiciones de temporal. El experimento se estableció en 2008 en dos localidades de Guanajuato, Celaya (1 785 msnm) y Ocampo (2 200 msnm) y una de San Luis Potosí, Villa de Arriaga (2 200 msnm). Se utilizó un dise o de bloques completos al azar. En las localidades de Guanajuato se determinaron características fenologicas y la reacción a enfermedades y en las tres se determino el rendimiento y peso de 100 semillas y a una muestra de semilla de cada material se le determino el contenido de hierro y Zinc. Se observaron diferencias significativas (p< 0.01) para rendimiento, peso de 100 semillas y contenido de hierro y zinc en el grano entre localidades, genotipos y para la interacción genotipo x localidad. A través de localidades, el mayor rendimiento, > 1 300 kg ha-1, lo obtuvieron las colectas RCG08001, RCA06001 y RCZ06001. El promedio del peso de 100 semillas más alto lo obtuvo la colecta RCSLP 08001 con 40.2 g. Las colectas sobresalientes por contenido de minerales fueron RCG 08011 y RCZ06001 con más de 65 y 40 ppm para Fe y Zn, respectivamente. En comparación con los testigos, las colectas mostraron ciclo largo y susceptibilidad a la roya y al tizón de halo. The 'Rosa de Castilla' type bean is popular in areas of Guanajuato, San Luis Potosí and Zacatecas, where it is produced under rainfed conditions. The aim of this research was to compare the agronomic characteristics of 22 RC accessions with two bred cultivars of the Flor de Mayo type beans grown under rainfed conditions. The trial was established during 2008 under rainfall conditions in two locations in the state of Guanajuato: Celaya (1 785 masl) and Ocampo (2 200 masl), as well as one in San Luis Potosí, in Villa de Arriaga (2 200 masl). A complete random block design was used. At the locations in Guanajuato, phenological characteristics and reactions to diseases were established, and in all three locations, seed yield and the weight of 100 seeds were determined; also, the iron and zinc contents were established in one seed sample for each material. Significant differences (p< 0.01) were observed for seed yield, weight of 100 seeds, and iron and zinc seed content for the effects of location, genotype and the interaction of both. Throughout locations, the greatest yield, > 1 3 00 kg ha-1 was obtained by accessions RCG08001, RCA
Patotipos de Colletotrichum lindemuthianum en Oaxaca y San Luis Potosí, México, y resistencia en genotipos de frijol
Sánchez-García, Bertha María;Flores-Olivas, Alberto;Sánchez-Arizpe, Abiel;Pineda-Rodríguez, Susana;López-Jiménez, Gabriela;Fraire-Velásquez, Saúl;Garrido-Ramírez, Eduardo Raymundo;Acosta-Gallegos, Jorge Alberto;Simpson Williamson, June;Rodríguez-Guerra, Raúl;
Agricultura técnica en México , 2009,
Abstract: anthracnose, a disease of common bean caused by colletotrichum lindemuthianum (sacc. et magn.) scrib., is worldwide distributed. c. lindemuthianum displays a significant pathogenic diversity which is important to know for the development of resistant cultivars. in mexico 54 pathotypes are known; however, some of the important bean producing states have not been thoroughly sampled. in this research 23 strains of c. lindemuthianum from oaxaca (15) and san luis potosí (8) were pathotypically characterized using twelve differential cultivars, during 2005-2007. in addition, 24 bean landraces from san luis potosí, 115 from guanajuato, as well as 55 bread cultivars, were challenged with the pathotypes 64 and 320 (which occur in both states) that infect differential cultivars from mesoamerican origin, in the search for sources of resistance. twelve and five pathotypes were identified in oaxaca and san luis potosí, respectively, with seven of them (69, 100, 260, 324, 325, 356 and 485) reported for the first time in mexico. results indicate higher pathogenic diversity than previously reported and that newly form or undetected combinations of avirulence genes are pre sent in mexico. from the 24 bean landraces from san luis potosí, 115 from guanajuato, and the 55 bred cultivars challenged, 12, 76 and 28, respectively, were resistant to both races; these genotypes could be used as sources of resistance against c. lindemuthianum.
Fusarium lateritium: nuevo patógeno de la raíz del frijol en México
Sánchez-García, Bertha María;González-Flores, Francisco;Pons-Hernández, José Luis;Acosta-Gallegos, Jorge Alberto;Cabral-Enciso, Mariandrea;Fraire-Velázquez, Saúl;Simpson, June;Rodríguez-Guerra, Raúl;
Agricultura técnica en México , 2006,
Abstract: root rots in common bean are caused by a complex of soil fungal species. in mexico, 10 fusarium species have been identifi ed in association with root rots in common bean and it has been suggested that f. lateritium has a role as bean pathogen due to its high frequency and wide distribution in several states of central mexico. in this investigation, the pathogenicity of seven isolates of f. lateritium, obtained from four different mexican states, was evaluated on the common bean cultivar montcalm (andean gene pool). the time of appearance and characteristics of symptoms caused by f. lateritium were observed on cv. montcalm and compared to those symptoms caused by f. solani on the same cultivar. all f. lateritium isolates caused symptoms on the roots and hypocotyls of the inoculated plants and signifi cant differences were observed among isolates and between them and the control (p <0.01). the isolates caused reactions from intermediate to susceptible on cv. montcalm which suggests poor variation in the agressiveness of the isolates of f. lateritium when inoculated on common bean. the fungus recovered was only from the inoculated plants. the symptoms caused by f. lateritium were observed seven days after inoculation and were distinguishable from those caused by f. solani at twenty one days after innoculation. results indicated that the f. lateritium isolates obtained from common bean roots in central mexico are pathogenic to this crop and that the cv. montcalm is susceptible.
Social networks and health-related quality of life: a population based study among older adults
Gallegos-Carrillo,Katia; Mudgal,Jyoti; Sánchez-García,Sergio; Wagner,Fernando A; Gallo,Joseph J; Salmerón,Jorge; García-Pe?a,Carmen;
Salud Pública de México , 2009, DOI: 10.1590/S0036-36342009000100004
Abstract: objective: to examine the relationship between components of social networks and health-related quality of life (hrql) in older adults with and without depressive symptoms. material and methods: comparative cross-sectional study with data from the cohort study "integral study of depression", carried out in mexico city during 2004. the sample was selected through a multi-stage probability design. hrql was measured with the sf-36. geriatric depression scale (gds) and the short anxiety screening test (sast) determined depressive symptoms and anxiety. t-test and multiple linear regressions were conducted. results: older adults with depressive symptoms had the lowest scores in all hrql scales. a larger network of close relatives and friends was associated with better hrql on several scales. living alone did not significantly affect hrql level, in either the study or comparison group. conclusions: a positive association between some components of social networks and good hrql exists even in older adults with depressive symptoms.
Aplicación foliar de calcio y su relación con la calidad en frutos de mango cv. Haden
Romero-Gomezca?a, Nelly Rosa;Sánchez-García, Prometeo;Rodríguez-Alcázar, Jorge;Saucedo-Veloz, Crescenciano;
Agricultura técnica en México , 2006,
Abstract: the aim of this research was to determine the effect of calcium foliar sprinkling and its relationship with other nutrients on fruit quality of mangoes cv. haden. an experiment was conducted on 16-year old trees during 2003 at san lucas, michoacan, mexico (18° 19' north latitude, 100° 40' west longitude and 251 masl). treatments consisted of five concentrations of ca(no ) (0, 5, 10, 15 and 20 g l-1), five foliar sprays of each were made every 15 days in pre-harvest. a completely random design with four replicates was utilized; each experimental unit consisted of three trees. ca treated trees had significantly higher fruit yield than the control. fruits kept at 20 ± 2 °c and 74 ± 4% r.h. showed significant differences (p<0.05) in respiration, fruit weight loss, acidity, and total soluble solids, but not for fruit firmness and color, as well as for pectin-metylesterase activity. fruit firmness correlated positively with the k/ca ratio (r= 0.9571**) and with pectin-metylesterase activity (r= 0.6844**). likewise, regression analysis of fruit firmness with k/ca and k+mg/ ca ratios were significant (p<0.05) with r2 of 0.9160 and 0.8504, respectively. furthermore, regression analysis between °brix/acidity and ca2+ rates was significant with a r2 of 0.82 (p<0.05). also, the analysis of °brix/acidity with k/ca and k+mg/ca, resulted significant (p<0.05) with r2 values of 0.82 and 0.86, respectively, and not for the n/ca ratio. fruit firmness had a positive relationship with k/ca and with pectin-metylesterase activity. with the increases in the k/ca and k+mg/ca ratios, fruit firmness also increased.
Por qué algunos clientes satisfechos desean cambiar de proveedor?
Isabel Sánchez-García
Universia Business Review , 2011,
Abstract: Generalmente, tanto académicos como profesionales asumen que la satisfacción es una condición necesaria para la retención del cliente. Sin embargo, en este trabajo se pone el acento en aquellos casos en los que ésta no es una condición suficiente. Para ilustrar algunos de los motivos que pueden llevar a los consumidores satisfechos a estar dispuestos a cambiar de proveedor se realiza una aplicación empírica en servicios de telefonía móvil y en destinos turísticos vacacionales. Los resultados ponen de manifiesto que, en telefonía móvil, hay una importante diferencia entre clientes satisfechos y altamente satisfechos, dado que los primeros se muestran más proclives a cambiar de compa ía. Además, tanto en telefonía móvil como en destinos vacacionales los consumidores más propensos al cambio son aquellos que poseen una percepción más elevada sobre la existencia de otras alternativas atractivas, experimentan un arrepentimiento anticipado más bajo y presentan una tendencia a la búsqueda de variedad más alta que los consumidores reacios a cambiar.
Professionalism in Wildlife Management: The Case of Gallifoms Releases in Hellas  [PDF]
Christos K. Sokos, Periklis K. Birtsas, Konstantinos G. Papaspyropoulos, Carlos Sánchez-García
Open Journal of Forestry (OJF) , 2016, DOI: 10.4236/ojf.2016.62005
Abstract: Hunting organizations in cooperation with the Forest Service release thousands of artificially reared pheasants and partridges in Hellas (Greece). To evaluate the effectiveness of this practice a questionnaire was applied to hunting wardens of four hunting federations in 2002 and one in 2011. Moreover data were obtained from the wildlife managers of one federation from 2009 to 2014. The release of hybrid pheasants and chukar partridges was conducted by the majority of local hunting clubs (H.C.). Most hunting wardens and wildlife managers stated that even during the most successful release only a small percentage (1% - 10%) of released birds can survive for more than three months and usually none of the released birds or a few achieve to rear chicks. However, repeated releases led to the establishment of small groups of birds in some areas, but without a serious benefit for hunting activity. In case of releases for hunting purposes (put and take), the respondents said that the majority (90%) of galliforms were killed by predators or hunters within a few days after release, and that only few (18 - 25) hunters harvested the survived birds. Until 2009, in northern and central mainland Hellas, the minimum cost per bird entering to the hunter’s bag was 143€. That amount is estimated to be 33.47€ in islands and after 2009 in mainland. In conclusion, the professionalism in galliforms releases should get improved with appropriate legal decisions and organization structures.
The Normalization of the “Active-Sedentary” Lifestyle in Spanish Youth  [PDF]
David Moscoso-Sánchez, Raúl Sánchez-García, Maria Martín-Rodríguez, Natalia Pedrajas-Sanz
Advances in Applied Sociology (AASoci) , 2014, DOI: 10.4236/aasoci.2014.47021
Abstract: Sedentarism has become one of the major concerns of our times. Nowadays people spend most of the time sitting down and moving by mechanical means instead of exercising themselves. Younger generations do only a little more sport today than their counterparts did a decade ago. In other words, sedentary habits have become common in our society, especially among the young. What cultural mechanisms have contributed to this? What are the consequences of a sedentary lifestyle for our health and well-being? These are the questions we have posed in this study. We conducted qualitative research among Spanish young people, and the results have provided important clues to help us understand better how “active sedentarism” has become the norm among young people.
Characteristics of SnO2:F Thin Films Deposited by Ultrasonic Spray Pyrolysis: Effect of Water Content in Solution and Substrate Temperature  [PDF]
Mario A. Sánchez-García, Arturo Maldonado, Luis Casta?eda, Rutilo Silva-González, María de la Luz Olvera
Materials Sciences and Applications (MSA) , 2012, DOI: 10.4236/msa.2012.310101
Abstract: Fluorine doped tin oxide, SnO2:F, thin films were deposited by ultrasonic chemical spray starting from tin chloride and hydrofluoric acid. The physical characteristics of the films as a function of both water content in the starting solution and substrate temperature were studied. The film structure was polycrystalline in all cases, showing that the intensity of (200) peak increased with the water content in the starting solution. The electrical resistivity decreased with the water content, reaching a minimum value, in the order of 8 × 10-4 Ωcm, for films deposited at 450℃ from a starting solution with a water content of 10 ml per 100 ml of solution; further increase in water content increased the corresponding resistivity. Optical transmittances of SnO2:F films were high, in the order of 75%, and the band gap values oscillated around 3.9 eV. SEM analysis showed uniform surface morphologies with different geometries depending on the deposition conditions. Composition analysis showed a stoichiometric compound with a [Sn/O] ratio around 1:2 in all samples. The presence of F into the SnO2 lattice was detected, within 2 at % respect to Sn.
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