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Search Results: 1 - 10 of 204168 matches for " Joaquín;Mendoza Castillo "
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Altas densidades con despunte temprano en rendimiento y período de cosecha en chile pimiento
Cruz Huerta, Nicacio;Sánchez del Castillo, Felipe;Ortiz Cereceres, Joaquín;Mendoza Castillo, Ma. del Carmen;
Agricultura técnica en México , 2009,
Abstract: the present research was carried out with the aim of determining the effect of plant stand combined with early pruning of the terminal buds on yield and length of harvest period in bell pepper. the experiment was carried out under soil-less culture conditions in a greenhouse at texcoco, estado de mexico, mexico, from 2004. the cv. ariane was utilized. three treatments were studied: 3.3 plants m2 with no pruning (control), 8 plants m2 with pruning above the fourth stem bifurcation and 14 plants m2 with pruning above the third stem bifurcation. a randomized block design with three replications was used. marketable fruit yield per plant and per m2 and lai were recorded. fruit yield was 873 g per plant in the control as compared to 604 and 404 g at 8 and 14 plants m2, respectively; however, yield per area basis was greater under high plant stands (5.63 and 4.83 kg m2 at 14 and 8 plants m2, respectively) as compared to the control (2.88 kg m-2). a high plant stand combined with early pruning of the terminal buds, significantly increased yield per unit area in bell pepper and showed potential to reduce the harvest period for specific market windows.
Aptitud combinatoria del rendimiento de antocianinas y de características agronómicas en poblaciones nativas de maíz pigmentado
Espinosa Trujillo, Edgar;Mendoza Castillo, Ma. del Carmen;Castillo González, Fernando;Ortiz Cereceres, Joaquín;Delgado Alvarado, Adriana;
Revista fitotecnia mexicana , 2010,
Abstract: the red, blue and purple maize (zea mays l.) kernels contain anthocyanins of importance in the human diseases prevention. nowadays, the selection of maize based on kernel color is considered relevant. to define efficient selection methodologies is convenient to apply genetics designs that allow analyzing the genetic contribution on the quantitative variation in the traits of interest. a genetic design was used to estimate general (gca) and specific (sca) combining abilities, maternal (me) and reciprocal (re) effects of the anthocyanin concentrations per unit of weight of grain (ackg) and the anthocyanin yield per hectare (ayha). an experiment of diallel crosses between five native populations with different grain color was established where some agronomic traits were measured. in another experiment, f2 seed was obtained using controlled pollination, to determine the concentrations of anthocyanin in the whole grain. using data from both experiments the anthocyanins yield per plant (aypta), per hectare (ayha) and the heterosis (%) were calculated. there was similarity among progenitors in the agronomic traits, but they differed on their capacity to accumulate anthocyanin. the gca effects were superior in most of the agronomic traits compared to the sca. the aypta had significant effects of gca, sca and re, being the red-1 population the one of greater gca. there was heterosis in crosses for ackg, where the best ones were red-1 × red-2, red-1 × blue-1 and red-1 × blue-2; and for ayha the best crosses were red-1 × red-2 and red-1 × blue-2.
Rendimiento de grano y sus componentes en maíces nativos de Tamaulipas evaluados en ambientes contrastantes
Pecina Martínez, J. Agapito;Mendoza Castillo, Ma. del Carmen;López Santillán, J. Alberto;Castillo González, Fernando;Mendoza Rodríguez, Moisés;Ortiz Cereceres, Joaquín;
Revista fitotecnia mexicana , 2011,
Abstract: among native maize (zea mays l.) populations of the state of tamaulipas, méxico, some stand out in grain yield; however their utilization in breeding programs has been limited. with the aim to identify outstanding populations for potential use in maize breeding programs, 29 native populations of tamaulipas (collected from 2001 to 2004), plus six improved varieties, were evaluated for grain yield and yield components under three environments contrasting in altitude and temperature. environments were: dry tropical (dt), transition (trn) and high valleys (hv), located at altitudes of 200, 1950 and 2250 m, respectively. based on their geographic origin, four groups were defined (groups 1 to 4) for native populations; two groups of improved varieties were added (groups 5 and 6), one for the tropical region and the other for the temperate zones. there were differences among environments (p ≤ 0.05) for grain yield, so that grain yield tended to be higher at higher altitude and lower temperature; no statistical differences were detected for grain yield components between trn and hv. among native maize populations from tamaulipas, the ones collected from the mountain region (group 4), located at intermediate altitude, showed higher yield in the trn and hv; locations, population c-4031 showed the highest yield (8.3 t ha-1), statistically similar to that of improved varieties used in the central valleys of méxico. native populations from tamaulipas developed longer ears with high number of kernels per row, thin cobs, good yield and high proportion of grain per ear. there results show that these native populations may contribute to broadening genetic diversity and could enhance for enhancing agronomic traits in of maize breeding.
Biomasa acumulada e intercambio gaseoso en maíz proveniente de semilla de diferente tama?o bajo humedad favorable y restringida: (con 3 tablas)
López-Santillán,José Alberto; Castro-Nava,Sergio; Trejo-López,Carlos; Mendoza-Castillo,Ma. Del Carmen; Ortiz-Cereceres,Joaquín;
Phyton (Buenos Aires) , 2004,
Abstract: the germination speed and seedling growth of maize seed of two different sizes was evaluated. to determine the differences in the biomass production during the vegetative stage from different seed size, considering the effects of humidity on seedling physiological status. a larger amount of biomass in endosperm and embryo allowed greater availability of reserves during the later stage of the germination; previous to emergency resulting in a high seedling vigor and a most accumulation of as much radical biomass as aerial during the vegetative stage, the water restriction during the germination and the vegetative stage of these plants caused a decrement of 72,6% in the aerial biomass accumulation in big and small seed plants, due to a diminution from diverse physiological processes such as stomatic conductance, transpiration and photosynthetic rate.
Hydro-Adsorption Study by Dynamic Laser Speckle of Natural Zeolite for Adsorbent and Fertilizer Applications  [PDF]
Ruth Dary Mojica-Sepulveda, Luís Joaquín Mendoza-Herrera, María Florencia Agosto, Eduardo Grumel, Delia Beatriz Soria, Carmen Inés Cabello, Marcelo Trivi
Advances in Chemical Engineering and Science (ACES) , 2016, DOI: 10.4236/aces.2016.65049
Abstract: The dynamic behavior caused by hydro-adsorption process of materials based on a rich mineral clinoptilolite together with their acidic, basic and calcinated forms has been studied by the dynamic laser speckle (DLS) technique. We propose a modified Peleg’s equation to improve fitting of DLS data. Textural (BET), structural (XRD) and spectroscopic (FTIR) properties were also studied and compared. We demonstrated that DLS was the most sensitive, simple and inexpensive method for comparing the performance of adsorptive materials with slightly modified surfaces. It also allowed the correlation with physicochemical properties.
Flora y vegetación de suelos crioturbados y hábitats asociados en la Cordillera Blanca, Ancash, Perú Flora and vegetation of cryoturbed soils and associated habitats in the Cordillera Blanca, Ancash, Peru
Asunción Cano,Wilfredo Mendoza,Susy Castillo,Marybel Morales
Revista Peruana de Biología , 2011,
Abstract: Entre los a os 2006 y 2008, se llevaron a cabo estudios florístico y de vegetación de los suelos crioturbados y hábitats asociados en cuatro localidades de la Cordillera Blanca (Ancash, Perú) localizadas por encima de los 4500 m. Se realizaron recolectas botánicas además de transectos de intersección-línea, en los cuales se midió el espacio (en cm) ocupado por cada especie. Fueron determinadas 136 especies de plantas vasculares, agrupadas en 65 géneros y 26 familias. Las Magnoliópsida (dicotiledóneas) fueron las más diversas con 97 especies, seguidas de las Liliópsidas (Monocotiledóneas) con 36. La mayor diversidad está concentrada en las familias Asteraceae y Poaceae (40,63%). Los géneros con mayor riqueza de especies fueron Senecio (18) y Calamagrostis (12). Se registraron 76 especies (54,82%) en suelos crioturbados y hábitats asociados; mientras que 60 especies (44,11%) fueron colectadas en la vegetación adyacente. El 95,56% de las especies reportadas fueron hierbas perennes. Se caracterizaron cuatro tipos de comunidades vegetales: a) comunidad de suelos crioturbados propiamente dicha, b) comunidad de suelos crioturbados asociada a pajonal, c) comunidad de suelos crioturbados asociada a roquedal seco y d) comunidad de suelos crioturbados asociadas a roquedal húmedo. Se indícan las especies características de cada comunidad. Since 2006 to 2008, floristic and vegetational studies on cryoturbed soils and its associated habitats were carried out in four sites above 4500 m, at Cordillera Blanca (Ancash, Peru). Botanical collections and intersection-line transects were made. The space (in cm) occupied by each species were measurement. A total of 136 species, in 65 genera and 26 families, were recorded. Magnoliopsida (Dicots) were the most diverse (97 spp.), followed by the Liliopsida (Monocots) (36 spp.). The highest species richness was found in the Asteraceae and Poaceae families (40,63%). The most diverse genera was Senecio (18) and Calamagrostis (12 ). We registered 76 species (54,82%) in cryoturbed soils and associates habitats, while 60 species (44,11%) were recorded for the adjacent vegetation. From the total, 95,56% of the species were perennials herbs. Four types of plants comunities were characterized: a) community of cryoturbed soil proper, b) community of cryoturbed soil associated with grassland, c) community of cryoturbed soil associated with dry rocky areas, and d) community of cryoturbed soil associated with humid rocky areas. Species associated to each community are given.
Estudio anátomo-radiológico mediante segmentación de los núcleos cerebrales caudado, putamen y pálido
Ros Mendoza,Luis H.; Cuartero,Joaquín Martín; Avellanas,Elena Abril; Olmos Gassó,Salvador;
Revista argentina de radiolog?-a , 2009,
Abstract: introduction: some encephalic structures are involved into the physiopathology of some neurologic and psychiatric entities. the different imaging modalities and the computer segmentation allow the opportunity of studying the possible relationship among them. objective: to elaborate an anatomic atlas of the encephalic structures by means of mr images, evaluating in healthy patients the normal values of these structures, in order to apply them in the study of patients with neurologic or psychiatric pathologies to determine a possible relationship. material and methods: ten mr studies of healthy patients, analysed by two independents radiologists. caudate, putamen and pallidum nuclei of both hemispheres were evaluated by means of the segmentation tool itksnap. the maximum, minimum and medium volumes of the nuclei were determined, comparing both sides and the interobserver correlation. results: the volumetric results for caudate nucleus (media) were: 4032 mm3 (+/-719'72), 4626'42 mm3 (+/-653'87) for the putamen and 1251'25 mm3 (+/-277'3) for the pallidum. the correlation index between the nucleus of both sides were of 0,974 for caudate, 0,946 for the putamen and 0,76 for the pallidum. the interobserver correlation indexes were 0,737, 0,919 and 0,082 respectively. conclusions: medical imaging segmentation, in this case mr, has a very promising future in order to analyse brain entities with morphometric or morphologic alterations. the obtained results in case of caudate, putamen and pallidum nuclei represent an initial key in order to establish the normal morphology and morphometry of these structures.
Estudio anátomo-radiológico mediante segmentación de los núcleos cerebrales caudado, putamen y pálido Anatomoradiologic study of cerebral nuclei caudate, putamen and pallidum by means of segmentation
Luis H. Ros Mendoza,Joaquín Martín Cuartero,Elena Abril Avellanas,Salvador Olmos Gassó
Revista Argentina de Radiología , 2009,
Abstract: Introducción: En la fisiopatología de algunas entidades neurológicas y psiquiátricas se involucran determinadas estructuras encefálicas. Las pruebas diagnósticas por imagen y la segmentación informática brindan la oportunidad de estudiar posibles relaciones entre ellas. Objetivo: Realizar un atlas anatómico mediante imágenes de resonancia magnética (RM) encefálica, definiendo los valores de normalidad en sujetos sanos de diversas estructuras para aplicarlos en el estudio de pacientes con patologías neurológicas y/o psiquiátricas, determinando posibles relaciones. Materiales y métodos: Diez estudios de RM de individuos sanos, analizados por dos radiólogos independientes. Se estudiaron los núcleos caudado, putamen y pálido de ambos hemisferios cerebrales, mediante la herramienta de segmentación ITK-SNAP. Se determinaron los volúmenes máximo, mínimo y medio de los núcleos, comparando ambos lados y la concordancia interobservador. Resultados: Los resultados volumétricos del caudado reflejaron una media de 4032 mm3 (+/-719'72), 4626'42 mm3 (+/-653'87) para el putamen y 1251'25 mm3 (+/- 277'3) para el pálido. Los índices de correlación entre los núcleos de ambos lados fueron de 0'974 para el caudado, 0'946 para el putamen y 0′76 para el pálido. Los índices de correlación interobservador fueron de 0'737, 0'919 y 0'082, respectivamente. Conclusiones: La segmentación en imágenes médicas -en este caso, RM- tiene un futuro prometedor para analizar patologías cerebrales con alteraciones morfológicas y/o morfométricas. Los resultados obtenidos para los núcleos putamen y caudado representan una directriz inicial para establecer la morfología y morfometría normales. Introduction: Some encephalic structures are involved into the physiopathology of some neurologic and psychiatric entities. The different imaging modalities and the computer segmentation allow the opportunity of studying the possible relationship among them. Objective: To elaborate an anatomic atlas of the encephalic structures by means of MR images, evaluating in healthy patients the normal values of these structures, in order to apply them in the study of patients with neurologic or psychiatric pathologies to determine a possible relationship. Material and methods: Ten MR studies of healthy patients, analysed by two independents radiologists. Caudate, putamen and pallidum nuclei of both hemispheres were evaluated by means of the segmentation tool ITKSNAP. The maximum, minimum and medium volumes of the nuclei were determined, comparing both sides and the interobserver correlation. Results: The volumetric
Cuestionario para evaluar en médicos conductas, conocimientos y actitudes sobre la higiene de manos
González-Cabrera,Joaquín; Fernández-Prada,María; Trujillo Mendoza,Humberto M.;
Gaceta Sanitaria , 2012, DOI: 10.1016/j.gaceta.2011.10.017
Abstract: objective: valid and reliable instruments to measure aspects of hand hygiene are needed to determine the current situation and impact of training among health professionals. the main objective of this study was to describe the development of a questionnaire on hand hygiene among health professionals and to analyze the properties of this instrument. method: a questionnaire was designed and implemented between january 2010 and march 2011 at the hospital clínico san cecilio (granada, spain). the final questionnaire consisted of 44 items that assessed provider behavior before and after contact with the patient, declarative knowledge, and attitudes to hand hygiene. the questionnaire was administered to 113 health professionals. results: a factor analysis was performed. data were obtained that supported the unidimensionality of the instrument with a general convergence value that explained 39.289% of the total variance and a cronbach's alpha of 0.784 for the established elements. significant differences were found in hand hygiene behavior before and after contact with the patient (t=-8,991, p <0.001). declarative knowledge and attitudes significantly predicted behavior. conclusions: the questionnaire shows high internal consistency, reliability, and validity and is thus a valid tool to assess behavior, knowledge and attitudes related to hand hygiene in health professionals. this instrument also detects deficiencies in basic knowledge.
Aproximación semiótica a los pregenéricos de las telenovelas colombianas
Félix Joaquín Lozano Cárdenas,María Inés Mendoza Bernal
Opción , 2010,
Abstract: El presente artículo da cuenta de una aproximación semiótica a los pregenéricos de las telenovelas colombianas, con el propósito de identificar los cambios narrativos y determinar su incidencia en la evolución del melodrama. Para el efecto, se analizan seis pregenéricos correspondientes a tres momentos significativos de la telenovela en Colombia, mediante la aplicación del modelo de análisis planteado por Casetti y Di Chio (1991) y Carmona (1991). Los cambios han sido muy significativos y se evidencian en la incorporación sistemática y especializada de diferentes códigos en las escenas que integran la secuencia audiovisual que da vida al cabezote o pregenérico.
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