Alejandra Hernández

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The photoprotective responses to an abrupt period of exceptional cold weather were studied in several Mediterranean evergreen species with different ecological requirements. The same pattern of response was observed in most of the species with little change in hydrophilic antioxidants (ascorbate and glutathione) and the carotenoid pool, an increase in the(More)
The denitrifying ability of thirteen strains of Rhizobium meliloti was tested. Most of the strains were able to reduce nitrate to nitrous oxide or dinitrogen. However, they failed to use nitrate as electron acceptor for ATP generation or growth at low oxygen tensions. Under micro-aerobic conditions, free-living cells of R. meliloti 102-F-51 strain exhibited(More)
Assemblages associated with intertidal rocky shores were examined for large scale distribution patterns with specific emphasis on identifying latitudinal trends of species richness and taxonomic distinctiveness. Seventy-two sites distributed around the globe were evaluated following the standardized sampling protocol of the Census of Marine Life NaGISA(More)
Studies on the inhibitory effects of combined nitrogen on biological nitrogen fixation in legume crops have been usually carried out after short-term nitrate treatments at high concentrations. As these treatments are quite different from field conditions, a study was conducted to evaluate the effects of the continuous presence of nitrate (0, 1, 5 and 10 mM)(More)
The rate of loss of activity of invertebrate iridescent virus 6 (IIV-6, family Iridoviridae) was determined in two artificial aquatic habitats in southern Mexico, using a sensitive insect bioassay technique. IIV-6 placed in trays of water in direct sunlight suffered rapid loss of activity (99.99% reduction) over a period of 36 h, during which water(More)
An integrated crop management system requires concerted fertilization-crop protection practice. Few data are available on the interactions between effectivity of pesticides and mineral nutrition of plants. We have studied the manifestation of toxicity in growth and mineral nutrition characteristics (N,P,K uptake, concentrations, ratios) of maize test plants(More)
The overall liking for taste of water was correlated with the mineral composition of selected bottled and tap waters. Sixty-nine untrained volunteers assessed and rated twenty-five different commercial bottled and tap waters from. Water samples were physicochemical characterised by analysing conductivity, pH, total dissolved solids (TDS) and major anions(More)
Mangrove forests are ecosystems made up of several woody plants living in saline coastal sedimentary habitats. In order to deal with the high salinity of the substrate, mangrove trees possess a number of different mechanisms to exclude, sequestrate or excrete the excess of salt. The black mangrove (Avicennia germinans L.), one of the dominant species in(More)
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