Artículos de revistas: Recent submissions
Now showing items 1261-1280 of 4968
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(2000)The easy transformation of 5,11,17,23-tetra-tert-butyl-25,27-bis(aminoethoxy)-26,28-dihydroxycalix[4]are ne (2) into 5,11,17,23-tetra-tert-butyl-26,28-dihydroxy-25,27-bis(2-isothiocyanoethoxy)ca lix[4]arene (3) and ...
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(2000)The Andean tuco-tuco, Ctenomys fulvus (Rodentia: Ctenomyidae) inhabits one of the most arid regions of the world, the Salar de Atacama, Northeast of Antofagasta, Chile (23°17'06''S, 68°05'43''W; 2.240 m.a.s.l). We found ...
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(Springer Verlag, 2000)We examined the costs associated with acclimation in an omnivorous mouse (Phyllotis darwini) fed two contrasting diets (carbohydrate-rich and protein-rich). We studied the response of gut morphology and digestive performance ...
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(Elsevier, 1999)Electronic ion energy loss calculations on the basis of the binary encounter approximation are presented for protons in oxygen, nitrogen and silicon. Calculations using both an analytical approach as well as a Monte Carlo ...
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(1999)We have recently reported that application of acetylcholine (ACh) or nicotine to the petrosal ganglion - the sensory ganglion of the glossopharyngeal nerve - elicits a burst of discharges in the carotid nerve branch, ...
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(Elsevier, 1999)A highly sensitive and selective second derivative spectrophotometric method has been developed for the determination of ruthenium and iron in mixtures. The method is based on the formation of the binary complexes of iron ...
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(Elsevier Ltd, 1999)The Diels-Alder reactions of 8,8-dimethylnaphtalene-1,4,5(8H)-trione with 2,4-hexadien-1-ol and its O-acetyl derivative were investigated in different solvents. The regiochemistry of the cycloaddition of the hexadienol was ...
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(Blackwell Munksgaard, 1999)Seeds of seven tree species, six shrub species, and one epiphyte were tested for their rates of removal by seed predators in two remnant patches (15-20 ha) of old-growth temperate forest in Chiloe Island, southern Chile ...
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(Academic Press, 1999)We describe the changes in plant cover, species richness, and flowering after rainfall over an entire growing season (September 1989-January 1990) in a southern Atacama Desert site in Chile. One month after the rain, ...
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(Elsevier Science Publishers B.V., 1999)A set of aerosol samples collected during major volcanic activities around the Chilean site Lonquimay in the years 1988-1990 has been subjected to measurements in conventional and microPIXE modes in the Debrecen institute. ...
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(Kluwer Academic Publishers, 1999)A simple method by first derivative spectrophotometry is proposed for the simultaneous determination of o-nitrophenol and p-nitrophenol. The analytes were separated from samples by liquid-liquid extraction (pH = 7.4) as ...
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(Elsevier, 1999)The putative role of nitric oxide (NO) in the physiology of olfactory receptor neurons (ORNs) is controversial. Here we report that pulses of NO caused an outward current in voltage-clamped isolated olfactory neurons. The ...
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(Ecological Society of America, 1999)Impacts of habitat fragmentation on forest bird communities have often been studied in landscapes dominated by agriculture. The striking structural differences between forest fragments and the matrix have led most researchers ...
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(1999)Malathion® is a widely used organophosphorate agropesticide. In spite of its low toxicity for mammalian cells, it provokes cytogenetic and genotoxic damage both in vivo and in vitro. The effect of Malathion was analyzed ...
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(Elsevier Ltd, 1999)The kinetics of accumulation of gramine were measured in three aphid infested and non-infested cultivars of barley (Hordeum vulgare; cvs. Frontera, Libra and Acuario). After 6 days of infestation gramine content increased ...
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(Elsevier Science Ltd, 1999)Hartman's linearization theorem for ordinary differential equations states that a 1:1 correspondence exists between solutions of a linear autonomous system and those of a perturbed system as long as the perturbation term ...
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(1999)Olfactory chemotransduction involves a signaling cascade. In addition to triggering transduction, odors suppress ion conductances. By stimulating with brief odorant pulses, we observed a current associated with odor-induced ...
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(Kluwer Academic/Plenum Publishers, 1999)2,4-Dihydroxy-7-methoxy-1,4-benzoxazin-3-one (DIMBOA), a hydroxamic acid involved in the resistance of cereals to aphids, was administered to adult individuals of the aphid Sitobion avenae in artificial diets. Effects on ...
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(1999)The cellular mechanism by which basolateral transferrin (Tf) produces an increase in apical-to-basolateral Fe flux in Caco-2 cells was analyzed. After a pulse of 59Fe from the apical medium, three types of basolateral 59Fe ...
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(Associacao Brasileira de Divulgacao Cientifica, 1999)As a result of recent investigations, the cytoskeleton can be viewed as a cytoplasmic system of interconnected filaments with three major integrative levels: self-assembling macromolecules, filamentous polymers, e.g., ...
