Términos relacionados

3 resultados encontrados para: AUTOR: Arellano, Elizabeth
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The propolis produced by bees are used in alternative medicine for treating inflammation, and infections, presumably due to its antioxidant properties. In this context, five propolis fromMéxico were investigated to determine their inhibitory lipid peroxidation properties. The ethyl acetate extract from a red propolis from Chiapas State (4-EAEP) was the most potent (IC50 = 1.42±0.07 μg/mL) in the TBARS assay, and selected for further studies. This extract afforded two new compounds, epoxypinocembrin chalcone (6), and an ε-caprolactone derivative (10), as well as pinostrobin (1), izalpinin (2), cinnamic acid (3), pinocembrin (4), kaempherol (5), 3,3-dimethylallyl caffeate in mixture with isopent-3-enyl caffeate (7a + 7b), 3,4-dimethoxycinnamic acid (8), rhamnetin (9) and caffeic acid (11). The HPLC profile, anti-mycobacterial, and antioxidant properties of this extract was also determined. Most of the isolated compounds were also tested by inhibition of reactive oxygen species (ROS) in challenged mouse bone marrow-derived mast cells (BMMCs), and DPPH. Their anti-inflammatory activity was evaluated by TPA, and MPO (myeloperoxidase) activity by ear edema test in mice. The most potent compounds were 7a + 7b in the TBARS assay (IC50 = 0.49±0.06 μM), and 2 which restored the ROS baseline (3.5 μM). Our results indicate that 4-EAEP has anti-oxidant, and anti-inflammatory properties due to its active compounds, suggesting it has anti-allergy and anti-asthma potential.

Human activities have changed and shaped landscape conditions of the Yucatán Peninsula for more than 4000 years. Several paleoecological studies showed the oldest pollen record of corn-based agriculture is from northern Belize, with an estimated age of 3300 BC. Several other studies report maize between 1500 and 3000 BC from northern Guatemala and the Mexican part of the Yucatán Peninsula. After 3500 cal yr BP several paleoecological studies showed a marked tendency to drier climatic conditions. In pollen records, increased drought is expressed as a reduced presence of fossil arboreal pollen. Pollen records with the presence of Zea mays also show other taxa, which are indicators of disturbance in different vegetation types.


2.
- Artículo con arbitraje
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Resumen en: Español | Inglés |
Resumen en español

La información actualizada sobre la representatividad geográfica y taxonómica de los ejemplares depositados en 28 colecciones mastozoológicas mexicanas y la disponible en las bases de datos Mammal Networked Information System (MaNIS), y de la Unidad de Informática para la Biodiversidad (UNIBIO) se recopiló con el fin de analizar y comparar el estado actual de los ejemplares de mamíferos mexicanos depositados en colecciones de Norteamérica. Se documentaron un total de 421,466 ejemplares de mamíferos depositados en 120 colecciones mastozoológicas, de los cuales 233,116 ejemplares se encuentran en colecciones de Estados Unidos de América y Canadá, y 188,350 ejemplares en colecciones de México. Las colecciones con el mayor número de ejemplares de mamíferos de México son la Colección Nacional de Mamíferos (CNMA 46,000), la Universidad de Kansas (KU 44,301), y la Escuela Nacional de Ciencias Biológicas (ENCB 43,985). En colecciones mexicanas, los estados del norte de México están escasamente representados en número de ejemplares (< 3,000), y en las colecciones extranjeras, los estados del centro de México están pobremente representados. Los estados mexicanos mejor representados por número de ejemplares (> 10,000) son Baja California Sur, Chiapas, Oaxaca, Puebla y Veracruz. Los órdenes mejor representados por el número de ejemplares son Rodentia y Chiroptera (234,978 y 120,956, respectivamente). Los estados mexicanos con menor extensión territorial tienen la mayor densidad de ejemplares colectados (ejemplares/km2): Distrito Federal (3.2), Tlaxcala (1.4), Colima (1.06) y Morelos (0.9). Se espera contar con una línea base que permita establecer estrategias adecuadas para completar el inventario nacional de los mamíferos mexicanos, y lograr que este patrimonio natural este adecuadamente representado en colecciones de México.

Resumen en inglés

Updated information on the geographic and taxonomic representativeness of mammal specimens deposited in 28 Mexican mammal collections, the Mammal Networked Information System (MaNIS), and the Unidad de Informática para la Biodiversidad (UNIBIO) data bases were compiled in order to analyze and compare the overall current status of the specimens of Mexican mammals deposited in collections in North America. A total of 421,466 specimens deposited in 120 collections were documented, of which 233,116 were deposited in collections in the United States of America and Canada, and 188,350 in collections in Mexico. The collections with the greatest number of specimens from Mexico are the Colección Nacional de Mamíferos (CNMA 46,000), the University of Kansas (KU 44,301), and the Escuela Nacional de Ciencias Biológicas (ENCB 43,985). In Mexican collections, the states of northern Mexico are improperly represented in number of specimens (< 3,000), whereas in foreign collections, the states of central Mexico are poorly represented. The Mexican states better represented by number of specimens (> 10,000) are Baja California Sur, Chiapas, Oaxaca, Puebla and Veracruz. The orders better represented in terms of number of specimens are Rodentia and Chiroptera (234,978 and 120,956, respectively). The Mexican states with the smallest area have the greatest density of specimens collected (specimens/km2), such as Distrito Federal (3.2), Tlaxcala (1.4), Colima (1.06), and Morelos (0.9). The aim of this analysis is to provide a baseline to establish appropriate strategies to complete the national inventory of Mexican mammals and to ensure that this natural heritage is fully represented within Mexican collections.


3.
Libro
Los mamíferos silvestres de México / Gerardo Ceballos y Gisselle Oliva (coordinadores)
Ceballos, Gerardo (coordinador) ; Oliva, Gisselle (coordinadora) ;
Distrito Federal, México : Comisión Nacional para el Conocimiento y Uso de la Biodiversidad :: Fondo de Cultura Económica , 2005
Clasificación: 599.0972 / M5
Bibliotecas: Campeche , San Cristóbal
Cerrar
SIBE Campeche
ECO040003175 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE San Cristóbal
ECO010012031 (Disponible)
Disponibles para prestamo: 1