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Search Results: 1 - 10 of 10058 matches for " Alejandro Casas "
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Flora ilustrada de la Reserva de la Biosfera Mariposa Monarca
Alejandro Casas-Fernández
Revista mexicana de biodiversidad , 2009,
Abstract:
LOS MERCADOS TRADICIONALES DEL VALLE DE TEHUACáN-CUICATLáN: ANTECEDENTES Y SITUACIóN ACTUAL
Yaayé Arellanes Cancino,Alejandro Casas Fernández
Nueva antropología , 2011,
Abstract: El presente artículo describe los elementos de lo que se considera mercado tradicional y las características específicas de seis mercados del Valle de Tehuacán-Cuicatlán, ubicados en Tehuacán, Ajalpan y San Sebastián Zinacatepec (Puebla), y Teotitlán de Flores Magón y San Juan Bautista Cuicatlán (Oaxaca). En estos mercados se realizaron entrevistas a vendedores que ofrecen productos vegetales, los cuales forman parte de su subsistencia, tradición cultural y son la parte medular de los mercados tradicionales. Además se describe la riqueza de elementos culturales asociados a la diversidad de vendedores, tipos de comerciantes, particularidades de tipos de venta, fechas con más comercio, tipos de medidas empleadas, entre otros. La diversidad cultural y biológica que albergan los mercados del Valle de Tehuacán imprime características singulares en relación con otros mercados del país.
Landscape management and domestication of Stenocereus pruinosus (Cactaceae) in the Tehuacán Valley: human guided selection and gene flow
Parra Fabiola,Blancas José,Casas Alejandro
Journal of Ethnobiology and Ethnomedicine , 2012, DOI: 10.1186/1746-4269-8-32
Abstract: Background Use of plant resources and ecosystems practiced by indigenous peoples of Mesoamerica commonly involves domestication of plant populations and landscapes. Our study analyzed interactions of coexisting wild and managed populations of the pitaya Stenocereus pruinosus, a columnar cactus used for its edible fruit occurring in natural forests, silviculturally managed in milpa agroforestry systems, and agriculturally managed in homegardens of the Tehuacán Valley, Mexico. We aimed at analyzing criteria of artificial selection and their consequences on phenotypic diversity and differentiation, as well as documenting management of propagules at landscape level and their possible contribution to gene flow among populations. Methods Semi-structured interviews were conducted to 83 households of the region to document perception of variation, criteria of artificial selection, and patterns of moving propagules among wild and managed populations. Morphological variation of trees from nine wild, silviculturally and agriculturally managed populations was analyzed for 37 characters through univariate and multivariate statistical methods. In addition, indexes of morphological diversity (MD) per population and phenotypic differentiation (PD) among populations were calculated using character states and frequencies. Results People recognized 15 pitaya varieties based on their pulp color, fruit size, form, flavor, and thorniness. On average, in wild populations we recorded one variety per population, in silviculturally managed populations 1.58 ± 0.77 varieties per parcel, and in agriculturally managed populations 2.19 ± 1.12 varieties per homegarden. Farmers select in favor of sweet flavor (71% of households interviewed) and pulp color (46%) mainly red, orange and yellow. Artificial selection is practiced in homegardens and 65% of people interviewed also do it in agroforestry systems. People obtain fruit and branches from different population types and move propagules from one another. Multivariate analyses showed morphological differentiation of wild and agriculturally managed populations, mainly due to differences in reproductive characters; however, the phenotypic differentiation indexes were relatively low among all populations studied. Morphological diversity of S. pruinosus (average MD = 0.600) is higher than in other columnar cacti species previously analyzed. Conclusions Artificial selection in favor of high quality fruit promotes morphological variation and divergence because of the continual replacement of plant material propagated and introductio
Ejercicios investigativos de la licenciatura en educación física, recreación y deportes y del grupo LERD
Fabio Alejandro Casas Herrera,Héctor Valerio Castro Quiroga
Educación y Territorio , 2011,
Abstract: El 17 de noviembre de 2011, el Programa de Licenciatura en Educación Física, Recreación y Deportes, en conjunto con su grupo de investigación (Grupo LERD), desplegó por primera vez una experiencia significativa en torno a los proyectos de investigación que actualmente se están desarrollando. En el Aula Máxima Augusto Trujillo, de la Fundación Universitaria Juan de Castellanos, los estudiantes de todos los semestres del Programa sustentaron sus proyectos de investigación, como una propuesta alternativa para concebir y crear una cultura de interacción investigativa. Con base en el núcleo de investigación y de los proyectos que allí se generan, los futuros profesionales de la Educación Física de nuestra alma máter, mostraron sus productos investigativos. Descargue el PDF para ver toda la rese a
Ecological and socio-cultural factors influencing in situ conservation of crop diversity by traditional Andean households in Peru
Dora Velásquez-Milla, Alejandro Casas, Juan Torres-Guevara, Aldo Cruz-Soriano
Journal of Ethnobiology and Ethnomedicine , 2011, DOI: 10.1186/1746-4269-7-40
Abstract: Richness of farmer varieties of tuber species cultivated by 28 peasant households was monitored in communities of Cajamarca and Huánuco, Peru during four consecutive agricultural cycles (from 2001 to 2005). In-depth interviews were conducted with 12 of the households with higher reputation as conservationists, in order to document farmers' perception of tubers qualities in ecological, social, economic, technological and culinary aspects and how these influence their decisions of conservation priorities. Traditional varieties were identified according to their local names, which were then confronted among farmers and with scientific catalogues in order to identify synonyms. Based on the information documented, indexes of ecological and socio-cultural factors affecting agricultural practices were designed, and their linear correlations and multivariate relations with varieties richness managed per household were analyzed in order to explore factors with higher influence on conservation of crop variation.A total of 1483 and 507 farmer varieties of tuber species were found in the whole sample and period studied in Huánuco and Cajamarca, respectively. Significantly more varieties managed per household per year were recorded in Huánuco (146.39 ± 12.02) than in Cajamarca (44.55 ± 9.26), and marked differences in number of varieties per year were documented among households within each region (78.25 to 246.50 in Huánuco, 7.50 to 144.00 in Cajamarca). Correlation and multivariate analyses identified that the extent of agricultural area managed by households, cultural identity, practicing of traditional agricultural techniques, and level of self-sufficiency, are meaningful factors influencing higher varieties richness maintained by households. Yield and culinary attributes were considered by people as main features for selecting and deciding which varieties are priorities for conservation.Maintenance and promotion of indigenous Andean culture is crucial for ensuring conservat
Uso, manejo y procesos de domesticación de pachycereus hollianus (f.a.c. Weber) buxb. (cactaceae), en el valle de tehuacán-cuicatlán, méxico
Rodríguez-Arévalo,Isela; Casas,Alejandro; Lira,Rafael; Campos,Jorge;
Interciencia , 2006,
Abstract: an ethnobotanical survey was conducted to document uses and traditional management of pachycereus hollianus in the valley of zapotitlán, within the tehuacán-cuicatlán valley in central-mexico. open and semistructured interviews showed that local people still use its products (stems, wood and fruits). six local variants with different kinds of edible fruit were identified and a clear association between plant and human populations was observed. the best phenotypes with large fruit and a red sweet pulp were found to be protected in managed areas and such management might have had effects on phenotype frequency in p. hollianus populations, increasing abundance through artificial selection principally directed towards sexual reproduction structures.
The marine algae Sargassum spp. (Sargassaceae) as feed for sheep in tropical and subtropical regions
Alejandro Marín,Margarita Casas-Valdez,Silvia Carrillo,Hugo Hernández
Revista de Biología Tropical , 2009,
Abstract: The objective of this study was to evaluate Sargassum meal as feed for sheep through the measures of in vivo digestibility, dry matter degradability, pH, ammonia and volatile fatty acids in rumen. The Sargassum algae used in this experiment were collected at the end of spring, when they are more abundant, bigger, and have completed their reproductive cycle. Four tons (wet weigth) were collected manually from the intertidal zone of La Paz bay, Baja California Sur, Mexico. These algae were sun-dried and ground in a hammer mill to obtain the Sargassum meal. Four fistulated Pelibuey sheep, were fed daily with diets containing the marine algae (MA) at different levels (0, 10, 20 and 30 %), using a 4 x 4 Latin-square design experiment. Feed intake was not affected (p>0.05). Water consumption and urine excretion increased with MA (p<0.05; r2=0.54 and r2=0.74, respectively). In all treatments dry matter digestibility was of 74%-79%, and crude protein digestibility was of 85%-88%. Acid detergent fiber (59%-65%) and neutral detergent fiber (55%-66%) digestibility were greater in all treatments with MA. Ruminal pH was greater in all groups fed with MA (p<0.05). Ammonium concentration was not influenced (p>0.05) by MA. Ruminal volatile fatty acids decreased in all MA groups (p<0.05). The marine algae Sargassum spp. can be used as a feed supplement for sheep, especially in tropical and subtropical regions where these marine algae are available. Rev. Biol. Trop. 57 (4): 1271-1281. Epub 2009 December 01. El objetivo de este estudio fue evaluar la harina del alga marina Sargassum como alimento para ovejas, midiendo la digestibilidad in vivo, la degradabilidad de la materia seca, así como el pH y los ácidos grasos volátiles en rumen. El alga Sargassum utilizada en este experimento, fue recolectada a finales de la primavera, cuando esta alga es más abundante, alcanza su mayor talla y ha completado su ciclo reproductivo. Se recolectaron manualmente, cuatro toneladas (peso húmedo) de la zona intermareal en la Bahía de La Paz, Baja California Sur, México. Estas algas fueron secadas directamente al sol y molidas en un molino de martillos, para obtener la harina. Se utilizaron cuatro borregos Pelibuey fistulados, distribuidos en un arreglo factorial de 4 x 4. Los animales fueron alimentados diariamente con dietas que contenían el alga marina (AM) Sargassum a diferentes niveles (0, 10, 20 y 30%). El consumo de alimento no se vio afectado con la inclusión del alga (p> 0.05). El consumo de agua y la excreción de orina se incrementaron conforme aumentó la concentración de AM en l
Resúmenes de las tesis de grado en floricultura realizadas en la Facultad de Agronomía, Universidad Nacional de Colombia. Bogotá D.C., entre 1981 y 1993
Casas Eduardo,Arbeláez Germán,Saavedra Alejandro,Chaves José Fransico
Agronomía Colombiana , 1992,
Abstract: Reconocimiento e identificación de Phialophora cinerescens y Fusarium oxysporum f. sp. dianthi en el cultivo del clavel en la sabana de Bogotá. / Estudio del poder patogénico de Botrytis cinerea pers. Sobre cinco especies de flores de exportación. / Botrytis cinerea Pers. / Agente causal de la pudrición de las flores y de la corona del estatice (Limonium sinuatum mili. / Aspectos biológicos y control químico de la roya del clavel en la sabana de Bogotá. / Patogenicidad de agrobacterium tumefaciens en algunas especies de plantas de flores de exportación. / Control del marchitamiento vascular del clavel ocasionado por Phialophora cinerescens y Fusarium oxysporum. / Control biológico de la agalla de corona en plantas de crisantemo con la cepa k-84 de Agrobacterium radiobacter var. Radiobacter (Beijerink & van celden) Conn. / Control de Fusarium oxysporum f. sp. dianthi en clavel mediante tratamiento del suelo y aplicación de antagonistas. / Control del marchitamiento vascular del clavel ocasionado por Fuserium oxysporum f. sp. dianthi. / Estudios orientados a la determinación del agente causal del síntoma "tallo flexuoso" en Rosa sp. Variedad visa. / Control de Sclerotinia sclerotiorum (lib.) de Bary en crisantemo y habichuela con diferentes aislamientos de Trichoderma y con fungicidas. / Efecto del fotoperiodo sobre la concentración y expresión de síntomas del virus Tswv en pompón y producción de material libre por cultivo de meristemos. / Estudios preliminares de la posible interacción entre el hongo Fusarium oxysporum Schlecht f. sp. dianthi (Prill & Del) Snyder & Hansen y el nematodo quiste Heterodera trifolii (Goffart), en clavel estándar (Dianthus caryophyllus l.) / Control químico de la .mancha foliar anillada del clavel causada por Heterosporium echinulatum. / Estudio de la detección del virus del marchitamiento moteado del tomate (TmSWV) y de trips asociados en el cultivo de pompón (Chrysanthemum morifolium Ram.) y algunas malezas. / Control biológico del marchitamiento vascular del clavel (Dianthus caryophyllus L.) ocasionado por Fusarium oxysporum f. sp. dianthi y erradicación de focos mediante el uso de tres aislamientos de Trichoderma harzianum. / Control biológico del marchitamiento vascular ocasionado por Fusarium oxysporum f. sp. dianthi en clavel estándar con aislamientos no patógenos de Fusarium oxysporum. / Control biológico del marchitamiento vascular del clavel miniatura ocasionado por Fusarium oxysporum f. sp. dianthi con aislamientos no patógenos de Fusarium oxysporum. / Efecto de la aplicación de fungicidas dirigidos al follaje y al
Flora y vegetación de las zonas núcleo de la Reserva de la Biosfera Mariposa Monarca, México
Guadalupe Cornejo Tenorio,Alejandro Casas,Berenice Farfán,José Luis Villase?or
Boletín de la Sociedad Botánica de México , 2003,
Abstract: Se realizó un estudio florístico y fisonómico de la vegetación en las zonas núcleo de la Reserva de la Biosfera Mariposa Monarca en los estados de México y Michoacán. Se efectuaron colectas botánicas durante un ciclo anual y se realizó una revisión de material previamente recolectado en la zona, depositado en los herbarios mexicanos IEB, EBUM y MEXU. El listado florístico incluye 423 especies que incluyen 32 taxa infraespecíficos de plantas vasculares, agrupadas en 87 familias y 244 géneros. Las familias con mayor riqueza de especies fueron Asteraceae (103), Lamiaceae (21), Fabaceae (17) y Scrophulariaceae (17), en tanto que a nivel de género sobresalen Salvia (13), Stevia (8) y Ageratina (7). Un total de 135 especies (31.9%), que incluyen 13 taxa infraespecíficos, son endémicas de México; 40 de estas especies pertenecen a Asteraceae. Las hierbas fueron la forma de crecimiento más frecuente (326 especies), seguidas por los arbustos (51) y los árboles (33). Se reconocen principalmente los siguientes tipos de vegetación: bosque de coníferas, bosque de Quercus, bosque mesófilo de monta a y pastizal antropogénico.
Inadequate glucose control in type 2 diabetes is associated with impaired lung function and systemic inflammation: a cross-sectional study
Rodolfo J Dennis, Dario Maldonado, Maria X Rojas, Pablo Aschner, Martin Rondón, Laura Charry, Alejandro Casas
BMC Pulmonary Medicine , 2010, DOI: 10.1186/1471-2466-10-38
Abstract: Subjects were selected at the Colombian Diabetes Association Center in Bogotá. Pulmonary function tests were performed and mean residual values were obtained for forced expiratory volume (FEV1), forced vital capacity (FVC) and FEV1/FVC, with predicted values based on those derived by Hankinson et al. for Mexican-Americans. Multiple least-squares regression was used to adjust for differences in known determinants of lung function. We measured blood levels of glycosylated hemoglobin (HBA1c), interleukin 6 (IL-6), tumor necrosis factor (TNF-α), fibrinogen, ferritin, and C-reactive protein (C-RP).495 diabetic patients were studied, out of which 352 had inadequate control (HBA1c > 7%). After adjusting for known determinants of lung function, those with inadequate control had lower FEV1 (-75.4 mL, IC95%: -92, -59; P < 0.0001) and FVC (-121 mL, IC95%: -134, -108; P < 0,0001) mean residuals, and higher FEV1/FVC (0.013%, IC95%: 0.009, 0.018, P < 0.0001) residuals than those with adequate control, as well as increased levels of all inflammatory markers (P < 0.05), with the exception of IL-6.Subjects with type 2 diabetes and inadequate control had lower FVC and FEV1 than predicted and than those of subjects with adequate control. It is postulated that poorer pulmonary function may be associated with increased levels of inflammatory mediators.The association of type 2 diabetes with decreased lung function (measured by known determinants of pulmonary disability and death, such as FEV1), has received renewed attention [1,2]. Inflammation, microangiopathy, and alterations in lung matrix proteins may all play a role. The first mechanism tends to unify the impairment seen in patients with emphysema with that seen in diabetes and cardiovascular disease; in this context, both type 2 diabetes and chronic lung disease, such as COPD, have been associated with increased levels of low-grade acute and chronic systemic inflammatory mediators and inflammatory markers [3-5]. Until recently, ho
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