oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 68 )

2018 ( 126 )

2017 ( 114 )

2016 ( 146 )

Custom range...

Search Results: 1 - 10 of 86678 matches for " Carlos;Padilla-Ramírez "
All listed articles are free for downloading (OA Articles)
Page 1 /86678
Display every page Item
Adaptation traits in dry bean cultivars grown under drought stress
Acosta-Díaz, Efraín;Acosta-Gallegos, Jorge Alberto;Trejo-López, Carlos;Padilla-Ramírez, José Saúl;Amador-Ramírez, Mario Domingo;
Agricultura técnica en México , 2009,
Abstract: drought is the major constraint to common bean (phaseolus vulgaris l.) production in mexico. the objective of this study was to identify physiological and phenological traits related to drought adaptation in common bean. a field experiment was conducted under a rainout shelter at the valley of mexico experimental station near texcoco, state of mexico. eight common bean cultivars from different genetic races and growth cycle and contrasted drought response were tested under drought stress and non-stress. irrigation was withheld 55 days after sowing at the initiation of flowering, to induce the stressed treatment. starting at this day, six consecutive nondestructive samplings were conducted at noon every other day. in each sampling, leaf water potential, stomata conductance and co2 assimilation rate were determined. data on phenology were also recorded. at physiological maturity, seed yield and shoot biomass were measured. harvest index was calculated. all cultivars exhibited a tendency to escape drought effects throughout accelerated reproductive development. this response was of small magnitude in mesoamerican cultivars negro cotaxtla 91 and bat 477 (type iii) and significant in cultivars from the durango race such as pinto zapata, bayo madero and bayo criollo del llano. significant difference among cultivars for stomata control was observed with high sensitivity in bat 477 and seq 12, cultivars from the mesoamerican race and in ica palmar from nueva granada race. bred and distinct cultivars ica palmar (type i) and pinto villa (type iii) from durango race, displayed high photosynthetic rate and harvest index, traits or mechanisms directly related to seed yield under stress and non-stress conditions.
Coleópteros necrófilos (Scarabaeidae, Silphidae y Trogidae) de Malinalco, Estado de México, México
Trevilla-Rebollar, Antonio;Deloya, Cuauhtémoc;Padilla-Ramírez, Jorge;
Neotropical Entomology , 2010, DOI: 10.1590/S1519-566X2010000400005
Abstract: collections were made during one year, between august 2005 and july 2006, in malinalco, state of mexico, in three sites of tropical deciduous forest, a pasture and a induced forest of pine-oak, established in a altitudinal gradient ranging from 1,253 m to 2,300 m. the total of 7,680 specimens scarabaeidae, silphidae and trogidae were captured through ntp-80, representing 18 genera and 38 species. onthophagus and canthon contained 46% of the richness of scarabaeidae. the more distant sites were complementary in their species composition. the lowest complementarity occurred between sites with tropical deciduous forest. it revises the material collected through pitffal traps and light traps funnel type, increasing the list of 38 to 50 species in the study area. between 40% and 50% of the species in malinalco are distributed in localities of the province of the basin balsas and localities of the province of the sierra madre del sur, and 30% in the localities of the province of pacifica coast. for the first time 17 species of scarabaeidae and three trogidae were reported for the state of mexico.
Fenología, producción y características de fruto de selecciones de durazno (Prunus persica L. Batsch.) Ana en Aguascalientes
Gutiérrez-Acosta, F.;Padilla-Ramírez, J. S.;Reyes-Muro, L.;
Revista Chapingo. Serie horticultura , 2008,
Abstract: peach (prunus persica l. batsch) of ana cultivar were obtained from seed grown trees at the commercial orchard "san carlos" in aguascalientes state, mexico. it has high fruit production and good commercial quality. selection is a plant breeding method commonly used in fruit crops. it is based on the identification of outstanding individuals, coming from seed propagation, with a desirable trait as selection criteria. the objectives of this research were to characterize and to evaluate a group of ana type peach selections. the study was conducted from 2000 to 2004 at the commercial orchard "san carlos", in the asientos county, aguascalientes state. plant phenology, fruit yield and quality were evaluated on twenty one selected trees originated from seed. for the statistical analysis of fruit yield and fruit number, a randomized complete block design was used, while for fruit characteristics a split plot design with 10 replications was used. least significant difference was used for mean comparisons (p< 0.05). the average phenological behavior of the five years of evaluation was as follows: beginning of flowering, sprouting and harvest was from the julian day 24 to 33; 28 to 39 and from the day 221 to 227, respectively. fruit yield per plant varied from 16.1 to 41.1 kg; fruit number was from 128 to 308 fruits tree-1, fruit weight ranged from 84.19 to 177.59 g; polar and equatorial diameter were from 4.89 to 6.51 cm and 5.23 to 6.91 cm, respectively. pulp thickness was from 1.64 to 2.44; total soluble solids were from 10.53 to 12.75%. finally, polar, equatorial diameter and seed weight were: from 2.93 to 3.38 cm, 1.99 to 2.38 cm and 4.48 to 6.77g, respectively. the outstanding selections were: s-59, s-67, s-65 and s-68.
Efecto del riego suplementario en la producción de biomasa y grano de frijol de temporal en Zacatecas, México
Acosta-Díaz, Efraín;Acosta-Gallegos, Jorge Alberto;Amador-Ramírez, Mario Domingo;Padilla-Ramírez, José Saúl;
Agricultura técnica en México , 2009,
Abstract: in the semiarid highlands of north-central mexico, the lack of water for agricultural production is an important problem, particularly since annually a depletion of two m in the water mirror of local wells is taking place and the water storage capacity in dams is limited. because of the above situation, the optimization of water resources through supplemental irrigation in critical stages of bean sown under rainfed conditions is important. the aim of the present research was to determine the effect of supplemental irrigation on shoot biomass accumulation and seed yield in two sets of improved cultivars with different seed type. two experiments were established at cezac experiment station in zacatecas, mexico in 2001; nine black-seeded cultivars were evaluated in one trial, and 14 seed colored cultivars in a second one. all cultivars are of the type iii indeterminate growth habit. two soil moisture levels were utilized: 1) rainfall plus supplemental irrigation and 2) natural rainfall conditions. the rainfall plus supplemental irrigation treatment consisted of maintaining the available soil moisture above 50% throughout the crop-growing season, which was achieved by rainfall plus two irrigations, one at pre- and the second at the flowering stages. the natural rainfall treatment depended only on the rainfall occurred during the growing season. in both experiments, average shoot biomass accumulation and seed yield of the rainfall plus supplemental irrigation were significantly higher (p<0.01) than those in the rainfall treatment. in general, black seeded cultivars, that were significantly later to mature (p<0.05), showed higher shoot dry weight and seed yield in response to the treatment rainfed+supplemental irrigation than the colored cultivars. there was a differential response of the cultivars to the moisture treatments; outstanding black seeded cultivars were negro zacatecas, negro ontiveros and negro z524 from the mesoamerican race, while among seed colored cultiva
Producción de fruto e índices productivos en árboles de guayabo
Padilla-Ramírez, José Saúl;González-Gaona, Ernesto;Reyes-Muro, Luis;Mayek-Pérez, Netzahualcóyotl;
Agricultura técnica en México , 2007,
Abstract: guava (psidium guajava l.) is one of the main fruit trees cultivated in mexico, with a production area of 24 000 ha and annual production of 3 00 000 t. fresh fruit production of 24 guava selections grown in huanusco, zacatecas, mexico was recorded during 1999-2002, and then related to two productivity indexes: productivity index based on canopy volume and productivity index based on stem cross sectional area. this work was conducted in order to identify useful traits that can be used for the evaluation of productivity in landraces and breed guava germplasm in mexico. all evaluated materials were identified and selected in the calvillo-ca?ones region. fruit production ranged from 34 to 73 kg tree-1, while the average number of fruits per tree was from 551 to 1514. selections with greatest number of fruits were 11, 106, 126, 12, and 47. the most vigorous accessions were 118, 106, 115, 117, and 42. positive associations between fruit production and productivity indexes were found.
Biomasa y rendimiento de frijol tipo flor de junio bajo riego y sequía
Acosta-Díaz, Efraín;Amador-Ramírez, Mario Domingo;Padilla-Ramírez, José Saúl;Gómez-Delgado, J. Patrocinio;Valadez-Montoya, Heladio;
Agricultura técnica en México , 2007,
Abstract: in the state of zacatecas, mexico 200 thousand ha of dry bean flor de junio class are annually sown, and its yield average is 315 kg ha-1. this low yield is due to intermittent drought during the growing season. the objective was to determine the effect of different soil moisture levels on plant maturity, shoot and root dry weight per plant, root-shoot ratio and yield of four bean genotypes. in 2002, two trials were conducted; one under greenhouse conditions and the other in the field at the unidad de agronomía of the universidad autónoma de zacatecas. in the greenhouse four soil moisture levels in 3 kg pots were evaluated; one without drought and three from moderate to severe stress: a) irrigated (r), 100% of the evapotranspired water was restituted every 12 h during the cycle, b) moderate drought (sm), 75% of the volume of r was restituted, c) severe drought (ss), 50% of the volume of r was restituted and d) moderate drought during the vegetative stage and severe drought during the reproductive stage (smv+ssr). in the field, two treatments were tested: rainfed (s), depending on rainfall and rainfed plus supplemental irrigation (s+r), with rainfall, contribution and three irrigations as needed. the stress treatments affected negatively all traits in the genotypes in comparison with r and s+r treatments in greenhouse and field, respectively. in the greenhouse; in comparison to the control (r) the average reductions observed with the smv+ssr treatment were: seven days to mature, 26% in shoot dry weight, 44% in root dry weight and 53% in yield. the negative effects increased accordingly to the drought level applied, except for root-shoot ratio, which increased with the stress. under field conditions, the average reductions under the rainfed treatment (s) as compared to (s+r) were: 13 days for maturity, 34% in shoot dry weight and 48% in yield. on the basis of yield reduction, drought susceptibility index and geometric mean of yield, lines uaz fj 2 and uaz fj 3 resulte
Efecto de la sequía en la producción de biomasa y grano de frijol
Acosta-Díaz, Efraín;Hernández-Torres, Ismael;Rodríguez-Guerra, Raúl;Pedroza-Flores, Jesús;Amador-Ramírez, Mario D.;Padilla-Ramírez, José Saúl;
Revista mexicana de ciencias agrícolas , 2011,
Abstract: intermittent drought is most limiting factor for bean production (phaseolus vulgaris l.) under seasonal conditions in mexico. aim of this work was to determine drought effect on biomass accumulation of sprout and grain yield in creole and introduced seasonal bean varieties. two experiments were set, one with 21 native varieties and another with 15 introduced varieties, from different uncertain type growth habit, at academic unit la asención from agronomy school of universidad autónoma de nuevo león, mexico in 2009. experiments were done under two treatments of soil humidity: irrigation during whole cycle and drought. in irrigation treatment soil was kept above 60% of serviceable humidity during cultivation cycle, by precipitation and four irrigation aids (two before and other two after flowering), while in treatment of drought irrigation was suspended when flowering started. in both experiments, under drought condition biomass accumulation of sprout and grain yield was significantly lower (p≤ 0.01) than in irrigation treatment. in general, effect of drought treatment on sprout's dry weight was greater in native varieties, while effect on grain yield was greater in introduced varieties. in drought, varieties with higher yield were: native, pinto-2, pinto-1, amarillo mantequilla, boleado, bayo blanco, canelo and quipincillo rojo-1; and introduced, peruano, flor de mayo media oreja, pinto-5 and ojo de cabra. in accordance with drought susceptibility index and geometric average, most efficient varieties for production of grain yield under both humidity conditions were: pinto-2, amarillo mantequilla, pinto-1, boleado, peruano, flor de mayo media oreja, pinto-5 and ojo de cabra; without exception, all these varieties were collected in test region, which demonstrates importance of local adaptation under drought conditions.
Utilidad del análisis de la variabilidad de la frecuencia cardíaca en la valoración de neuropatía autonómica diabética
Gutiérrez,Oswaldo; Putvinsky,Alexei; Padilla,Juan I; Ramírez,Catalina; Mora,Carlos;
Revista Costarricense de Cardiología , 2000,
Abstract: introduction. a recognized diabetes mellitus complication is autonomic neuropathy (dan), that is usually diagnosed by clinical criteria. heart rate variability analysis (hrv) consist in the study of time variations along consecutive heart beats, reflecting autonomic influence, with prognostic importance. objetive. to determine usefullness of hrv analysis as ancilliary method for diagnosis and follow-up of patients with dan. materials y methods. we selected type 2 diabetic patients with clinical diagnosis of dan and without dan, as control group. also we included healthy individuals. for data adquisition we used a powerlab equipment with a single electrocardiographic lead, during 5 minutes. we calculate time domain and frequency domain variables and compared it between groups. results. we studied 6 diabetic patients witn dan, 3 without dan and 6 normal subjects. the most dramatic difference ocurred in diabetics with dan. comparing mean values between both groups of diabetics we observed statistical differences in time domain and in frequency domain variables: sdnn 26.799 vs 12.601, p=0.047, sddnn 21.880 vs 9.953, p=0.031, rmssd 21.841 vs 9.940, p=0.03), lf 125.937 vs 35.077, p=0.1 and hf 67.717 vs 14.472, p=0.02). we did not found differences between diabetes without dan and normal controls. conclusion. hrv analysis is usefull in evaluating cuantitatively dan, with prognosis information.
?Nuevas generaciones, nuevas creencias? Violencia de género y jóvenes
Ramírez Rodríguez, Juan Carlos;López López, Gemma Cithlalli;Padilla González, Francisco José;
La ventana. Revista de estudios de género , 2009,
Abstract: beliefs are key elements to understand and to identify gender relations and violent relations among young men and women. this article presents and discusses findings from a population of young people in the metropolitan area of guadalajara. beliefs are recreated from one generation to the next. they are associated with control and domination of women by men: a constant tension between good and bad treatment, men's perception of women as attempting to dominate men. a comprehensive understanding of such beliefs could translate into intervention strategies that promote gender equity.
Manifestaciones cutáneas de lupus eritematoso sistémico temprano y correlación con la actividad sistémica
Velásquez Franco,Carlos Jaime; Anaya Prada,Andrés; Rodríguez Padilla,Libia María; Vargas Grajales,Francisco Iván; Ramírez Gómez,Luis Alberto;
Iatreia , 2011,
Abstract: cutaneous manifestations of systemic lupus erythematosus (sle) are heterogeneous (both specific and non-specific). little is known about the relationship between these manifestations and the clinical and immunological activity of the disease in early stages. we carried out a cross-sectional study in 34 patients with early sle. we found a significant association between alopecia and hypocomplementemia c3 (p = 0.021), hypocomplementemia c4 (p < 0.001) and anti-sm (p = 0.011); between malar erythema and anti-ro (p = 0.037) and anti-la (p = 0.037); between photosensitivity and anti-rnp (p = 0.037). we observed a trend to association between oral ulcers and hypocomplementemia c4 (p = 0.064). no association was found between cutaneous manifestations and the presence of anti-ds dna, anticardiolipin antibodies, lupus anticoagulant, false-positive vdrl, leucopenia, thrombocytopenia, hypergammaglobulinemia, elevated erythrosedimentation rate or sledai. we highlight the relevance of the relationship between non-specific cutaneous manifestations of early sle (alopecia and photosensitivity) and the systemic activity of the disease and hypocomplementemia, an important marker of immunological activity.
Page 1 /86678
Display every page Item


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