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Search Results: 1 - 10 of 97079 matches for " José Guadalupe Martínez-ávalos "
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Una nueva especie de echeveria (Crassulaceae) del estado de Tamaulipas, México
José Guadalupe Martínez ávalos,Arturo Mora Olivo
Acta botánica mexicana , 2000,
Abstract: Se describe Echeveria rodolfi como una nueva especie para la flora del estado de Tamaulipas, México. Fue colectada en 1998, en una aislada localidad en el municipio de Hidalgo, cerca de los límites con el estado de Nuevo León. Se compara con E. bifida, E. walpoleana y E. strictiflora, a las que se asemeja en su morfología, pero las diferencias en el tama o de la roseta, la forma y tama o de las hojas, la presencia de mayor número de hojas de color vino cenizo, además de pedicelos largos de las flores individuales y el tama o irregular de las brácteas y sépalos, ubican a E. rodolfi como una especie nueva perteneciente a la serie Angulatae.
Una nueva especie de Mammillaria (Cactaceae) para Tamaulipas, México
Martínezvalos, José Guadalupe;Golubov, Jordan;Arias, Salvador;Villarreal-Quintanilla, José ángel;
Acta botánica mexicana , 2011,
Abstract: mammillaria cielensis (cactaceae), a new species of cactaceae from "el cielo" biosphere reserve (rbc) in tamaulipas, mexico, is described and illustrated. the new species is similar to m. zublerae repp., differing from this species in the size of the stem, the rounded form of the apex, the smaller tubercles, the areoles with white wool, the more numerous and somewhat shorter radial and central spines, the colour and size of the fruits, the shinier and larger seeds, with heavily pitted and slightly reticulate testa, and larger hilum. its known distribution is restricted to pine oak forest in the rbc, in the southern part of the state of tamaulipas, mexico. a comparison with related species is presented.
UNA NUEVA ESPECIE DE MAMMILLARIA (CACTACEAE) PARA TAMAULIPAS, MéXICO
José Guadalupe Martínezvalos,Jordan Golubov,Salvador Arias,José ángel Villarreal-Quintanilla
Acta botánica mexicana , 2011,
Abstract: Se propone a Mammillaria cielensis (Cactaceae), como una especie nueva de la Reserva de la Biosfera "El Cielo" (RBC) en Tamaulipas, México. Es morfológicamente muy similar a M. zublerae Repp., de la cual difiere en el tama o del tallo, la forma redondeada del ápice, los tubérculos de menor tama o y glabros, aréolas con lana blanca, las espinas radiales y centrales más numerosas y ligeramente más cortas, frutos de diferente color y tama o, la semilla de mayor tama o, con testa porosa y el hilo de mayores dimensiones. Su distribución conocida se restringe al bosque de pino encino en el área de la RBC, al sur del estado de Tamaulipas, México. Se presenta una comparación con las especies afines.
Especie nueva de Echeveria (Crassulaceae) de Tamaulipas, México
Martínezvalos, José Guadalupe;Mora-Olivo, Arturo;Terry, Martin;
Revista mexicana de biodiversidad , 2009,
Abstract: echeveria tamaulipana (crassulaceae) is described and proposed as a new species. the new species is similar to those of the series angulatae, especially e. bifida, e. walpoleana and e. strictiflora, with which it is compared because of their similarity in morphology. its geographical distribution is restricted to canyons near ciudad victoria, tamaulipas.
Especie nueva de Echeveria (Crassulaceae) de Tamaulipas, México New species of Echeveria (Crassulaceae) from Tamaulipas, Mexico
José Guadalupe Martínezvalos,Arturo Mora-Olivo,Martin Terry
Revista mexicana de biodiversidad , 2009,
Abstract: Se describe y propone Echeveria tamaulipana (Crassulaceae) como especie nueva para la ciencia). El nuevo taxón se asemeja a los de la serie Angulatae, especialmente E. bifida, E. walpoleana y E. strictiflora con los cuales se compara por la semejanza en su morfología. Su distribución geográfica se restringe a los ca ones cercanos a Ciudad Victoria, Tamaulipas. Echeveria tamaulipana (Crassulaceae) is described and proposed as a new species. The new species is similar to those of the series Angulatae, especially E. bifida, E. walpoleana and E. strictiflora, with which it is compared because of their similarity in morphology. Its geographical distribution is restricted to canyons near Ciudad Victoria, Tamaulipas.
Estudio de la herbivoría de la palma camedor ( Chamaedorea radicalis ) Mart., en la Sierra Madre Oriental de Tamaulipas, México
SáNCHEZ-RAMOS, Gerardo;REYES-CASTILLO, Pedro;MORA OLIVO, Arturo;MARTíNEZVALOS, José Guadalupe;
Acta zoológica mexicana , 2010,
Abstract: rates of insect herbivory (% of leaf area eaten per day) were measured on the radicalis palm (chamaedorea radicalis mart.), during three seasons: early and late rainy season and the middle of the dry season at two different sites: temperate and tropical deciduous forest within the state of tamaulipas, mexico. in addition, some structural plant parameters (height, cover and diameter stem), physical plant parameters (foliar toughness and water content) and chemical plant parameters (nitrogen and phenols content) were measured, these parameters were correlated with timely (punctual) herbivory measurements. results from this study show that the early wet season had the most feeding damage (0.17% per day); whereas, the dry season had the least damage (0.09% per day). the rate of herbivory per day during the middle of the wet season was 0.13%. these values are greater than those commonly reported from such habitats. the highest plants (1.1 times more), but with the least covers corresponded to the tropical deciduous forest. within the tropical semideciduos forest this specie cover 2% of understory, whereas to the temperate forest cover 4%. in addition, nitrogen, phenol, and water content of leaves decreased as the season progressed; whereas, leaf toughness increased. we found leaf toughness during the late rainy season and the dry season to be the most effective repellent to herbivory.
ESTUDIO DE LA HERBIVORíA DE LA PALMA CAMEDOR (CHAMAEDOREA RADICALIS) MART., EN LA SIERRA MADRE ORIENTAL DE TAMAULIPAS, MéXICO
Gerardo Sánchez-Ramos,Pedro Reyes-Castillo,Arturo Mora Olivo,José Guadalupe Martínezvalos
Acta zoológica mexicana , 2010,
Abstract: Se realizaron análisis de la herbivoría (% de área foliar consumida día-1) sobre la palmilla camedor (Chamaedorea radicalis Mart.) durante tres épocas del a o: inicio y final de lluvias y época seca en dos diferentes sitios: bosque tropical subcaducifolio y bosque mixto templado en el estado de Tamaulipas, México. Adicionalmente, se realizaron mediciones de algunos parámetros estructurales (altura, cobertura y diámetro del tallo), parámetros físicos de la planta (agua foliar y dureza foliar) y parámetros químicos foliares (nitrógeno foliar y fenoles totales), estos fueron correlacionados con mediciones de herbivoría instantánea. Los resultados muestran mayor consumo foliar al inicio de la época lluviosa (0.17% por día), mientras que en la época seca obtuvo el menor registro (0.09% por día). La tasa de herbivoría diaria durante el final de las lluvias fue de 0.13%. Estos valores son más altos de los comúnmente descritos para esos hábitats. Para el bosque tropical las plantas presentaron la mayor altura (1.1 veces más), pero con menor cobertura (2.1 veces menos). Dentro del bosque tropical esta especie cubre el 2% del sotobosque, mientras que en el bosque templado cubre el 4%. El contenido de nitrógeno, fenoles totales y agua foliar de las hojas decrecen en tanto que la estación del a o progresa, en tanto que la dureza foliar se incrementa. Encontramos que la dureza foliar al finalizar las lluvias y durante la época seca, fue la defensa más efectiva para la herbivoría.
Geochemical Prospection of the Chapala Ciénega at Michoacán State  [PDF]
José Martínez Reyes, Ivan Vera Romero, Meliton Estrada Jaramillo, Agustina Ortiz Soriano, Ignacio Moreno Nava, Francisco Gabriel Montes Ayala, Francisco García ávalos, Ernesto Mendez Ruiz
International Journal of Geosciences (IJG) , 2014, DOI: 10.4236/ijg.2014.59086
Abstract:

The geochemical prospection as a branch of Applied Geochemistry or “Geochemistry of the Landscape” studies the spatial and temporal location of geochemical anomalies in order to locate geological resources of economic value. The Ciénega de Chapala zone in Michoacán is located east of the Citala rift hosting a geological system that leads to regional hydrothermal activity, mainly the Pajacuaran and Ixtlan failures. The regional geothermics include a superficial hydrothermalism consisting of springs and wells of hot water with temperatures between 48°C and 94°C in Ixtlan de los Hervores and mud volcanoes in the water with temperatures between 48°C and 94°C in Ixtlan de los Hervores and mud volcanoes in the Los Negritos. The waters and gases of these hydrothermal manifestations have physicochemical characteristics that indicate the presence of geothermal fluids. To search for possible presence of minerals of economic value, a study of elemental chemical analysis was performed by scanning electron microscopy in samples of rock of the sierra de Pajacuaran, the result of the analysis is clearly abnormal values which may be indicative a geochemical anomaly as well as the possible presence of minerals of economic value in the region. Given the above, the area of the Ciénega de Chapala in Michoacán is a zone where work can be continued both geothermal and mineralogical exploration by conventional techniques or even totally innovative technologies.

Obtención de prostaglandina H sintetasa aplicando iones de Ca2+ para la precipitación de las fracciones microsomales
Anna Ilyiná,María Guadalupe Pineda,José Luis Martínez,Victor Manuel Martínez
Revista de la Sociedad Química de México , 1997,
Abstract:
Factores de riesgo en las Cactaceae amenazadas de una región semiárida en el sur del desierto Chihuahuense, México
Hernández-Oria,José Guadalupe; Chávez-Martínez,Ruth Julieta; Sánchez-Martínez,Emiliano;
Interciencia , 2007,
Abstract: the querétaro semi-arid region, in central mexico, harbors one of the main threatened cacti assemblages in the chihuahua desert, the richest cactus diversity area in the world. for several decades, endangered cacti have been associated with a complex problem for their survival, including mainly anthropogenic disturbance and illegal collecting. threatened species are frequently recognized as biologically rare, given their limited special distribution and abundance. nevertheless, the influence of potential risk factors on the natural development of threatened cacti is largely unknown. thus, a set of disturbance factors was evaluated to assess their effects on threatened populations. fragmentation and destruction of habitat derived from human activities, as well as the lack of seedlings and the extremely low density of some species, were found to be the major causes influencing the natural development of plants and threatening the cacti community. results suggest that partial and total habitat transformation, as well as adverse demographic features should be considered as the major risk for cacti vulnerability and survival. conservation measures should also include protection of the dry environment, since it is a critical and key element and could decrease the extinction risk of this cacti assemblage.
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