Papers by ROGELIO GONZALO COHELLO AGUIRRE
Botanical Sciences, Mar 1, 2014
Interciencia Revista De Ciencia Y Tecnologia De America, 2010
La agricultura de secano es el cultivo de las tierras semiaridas basado unicamente en el agua de ... more La agricultura de secano es el cultivo de las tierras semiaridas basado unicamente en el agua de lluvia. En Mexico este tipo de agricultura se conoce ambiguamente como de temporal, como si se tratara solamente de produccion basada en la precipitacion caida in situ, aunque en otras partes del mundo la agricultura de secano representa un concepto mas amplio. El estudio de los metodos tradicionales para la obtencion de cosechas de secano adquiere relevancia si se considera 1) la gran extension de tierra donde se practica, 2) el alto numero de nucleos de poblacion que tienen en este tipo de agricultura uno de sus principales medios de subsistencia, y 3) que se trata de una forma de uso del suelo sumamente aleatoria y poco productiva (al menos desde el punto de vista mercantil), por lo que ha recibido minimo apoyo cientifico y tecnologico. El objetivo de este trabajo fue caracterizar y explicar los sistemas de produccion de cosechas con manejo de escorrentias en el altiplano potosino. Se concluye que en la region de estudio la agricultura de escorrentias se basa en conocimientos solidos tradicionales y es similar a la que se practica en otras regiones del mundo con caracteristicas ecologicas similares. El manejo de escorrentias y la labranza para arropar la humedad incrementa la disponibilidad de agua y su conservacion en las parcelas de cultivo, pero ambos tipos de practicas requieren ser mejoradas
Botanical Sciences, 2014
En México se encuentra la mayor riqueza de especies de Agave , distribuidas en ambientes diversos... more En México se encuentra la mayor riqueza de especies de Agave , distribuidas en ambientes diversos. Para contribuir con el conocimiento en torno a las formas de tolerar las restricciones de humedad se evaluó el efecto de dos potenciales de agua (?) en el sustrato (-0.7 y -3.5 MPa) durante 14 meses, en invernadero, sobre el crecimiento, la distribución de biomasa, el grosor foliar y el contenido de prolina en dos especies del subgénero Littaea ( A. lechuguilla y A. striata ) y seis del subgénero Agave ( A. americana var. marginata , A. angustifolia subsp. tequilana , A. asperrima , A. cupreata , A. duranguesis y A. salmiana ), reconocidas por su importancia económica y ecológica. La menor disponibilidad de humedad inhibió la acumulación de biomasa en las ocho especies; no obstante, el crecimiento (número de hojas y cobertura de planta) pudo mantenerse en aquellas más adaptadas a la aridez o con límites de tolerancia ambiental más amplios como A. angustifolia subsp. tequilana , A. dura...
2015 International Conference on Electronics, Communications and Computers (CONIELECOMP), 2015
ABSTRACT A fast method to discriminate between mezcal samples with different aging times was prop... more ABSTRACT A fast method to discriminate between mezcal samples with different aging times was proposed using Raman spectroscopy and multivariate analysis techniques. The multivariate analysis were performed using Principal component analysis (PCA) and Partial least squares discriminant analysis (PLS-DA). The first principal component separates the matured aged mezcal (rested and aged) while the second principal component separates the non-matured from the matured mezcal. PLS-DA was chosen as supervised classifier to predict the belonging of unlabeled spectra to one of aging classes. The results demonstrated that Raman spectroscopy in combination with multivariate analysis could be used as fast method for discrimination between matured mezcal with different aging time.
Biological research, 2014
Plants of Agave spp. perform Crassulacean acid metabolism (CAM) and are highly drought-tolerant, ... more Plants of Agave spp. perform Crassulacean acid metabolism (CAM) and are highly drought-tolerant, but little is known concerning seed germination under low water availability. The aim of this study was to assess the effect of substrate water potential (ΨW) on seed germination and contrast hydrotime parameters of seven valuable and commercially-important Agave species from different geographical distributions and climatic regions of Mexico. Our hypothesis was that seed germination of Agave species is not affected by low water availability independently of seed biomass and the climate of their distribution area. Seed germination (at 25°C and in the dark) between 85 and 100% for all species occurred within 80-180 h at -0.03 MPa and 250-430 h at -1.0 MPa. Seed germination at -1.5 MPa declined to less than 50% (p < 0.05) for A. asperrima and A. cupreata but did not change significantly for A. americana var. marginata, A. lechuguilla and A. striata, although they showed the lowest mean ...
Plant Species Biology, 2011
The genetic diversity of Agave plants is threatened by clonal commercial reproduction and climati... more The genetic diversity of Agave plants is threatened by clonal commercial reproduction and climatic change. Sexual reproduction is uncommon and research on seed germination is scarce. The present study evaluated the seed germination of Agave lechuguilla, Agave striata, Agave americana var. marginata, Agave asperrima, Agave cupreata, Agave duranguesis, Agave angustifolia ssp. tequilana and Agave salmiana at constant temperatures (10, 15, 20, 25, 30, 35 and 40°C). Initial imbibition (after the first 12 h) was significantly variable among species, positively correlated with seed weight (r = 0.6560, P < 0.001) and increased with temperature (from 35% at 10°C to 66% at 40°C). Temperature affected maximum imbibition (83-150%) for A. asperrima, A. lechuguilla, A. salmiana and A. striata; other species averaged 110%. Most germination kinetics best fitted a logistic model, whereas only a few treatments fit a Weibull model. The time to germination onset diminished (P < 0.05) from 125-173 h at 15°C to 68-84 h at 25°C, and then ascended to 84-196 h at 35°C. The mean germination rate and seed germination percentage after 312 h peaked at 25°C (0.50-0.95% seeds/h and 85-99%, respectively) and fell (P < 0.05) to near zero at 10 and 40°C. Temperatures of 10, 35 and 40°C were partially lethal to A. asperrima, A. duranguensis and A. salmiana seeds. The time to germination onset, seed germination percentage after 312 h and mean germination rate are best described by a Gaussian distribution, with its optimum at approximately 25°C. Thus, optimum temperatures are related to the ecological characteristics of each species area.
Toxicology, 2005
Methylmercury (MeHg) inhibits glutamate uptake by astrocytes, which can contribute to neuronal lo... more Methylmercury (MeHg) inhibits glutamate uptake by astrocytes, which can contribute to neuronal loss through excitotoxicity. We explored the extent at which this phenomenon is involved in MeHg-induced DNA damage in the rat cortex. MeHg amounts that increase extracellular glutamate (1.5, 7.5 and 15 nmol, according to previous reports) were stereotaxically injected in the frontal cortex of adult rats before DNA-damage determination by means of a quantitative TUNEL assay. After either 24 or 48 h, the cortex of all exposed animals showed significant increments of damaged DNA, compared with rats that only received sterile saline. In parallel experiments, we found that the administration of a non competitive NMDA receptor antagonist (MK-801, 10 mg/kg, i.p.) 1 h before MeHg injection, significantly reduced DNA damage. These results demonstrate that activation of NMDA receptors contributes importantly to MeHg neurotoxicity.
Interciencia, 2001
2001 César del C. Luna Morales / J. Rogelio Aguirre R. CLASIFICACIÓN TRADICIONAL, APROVECHAMIENTO... more 2001 César del C. Luna Morales / J. Rogelio Aguirre R. CLASIFICACIÓN TRADICIONAL, APROVECHAMIENTO Y DISTRIBUCIÓN ECOLÓGICA DE LA PITAYA MIXTECA EN MÉXICO Interciencia, enero, año/vol. 26, número 001 Asociación Interciencia Caracas, Venezuela pp. 18-24
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Papers by ROGELIO GONZALO COHELLO AGUIRRE