Repositorio Académico de la Universidad de Chile: Recent submissions
Now showing items 44161-44180 of 98648
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(2000)Hydroxamic acids (Hx) are wheat secondary metabolites conferring resistance for cereals against aphids. The activity of five enzymatic systems were evaluated in the aphid Sitobion avenae reared on the high-Hx wheat cultivar ...
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(2000)Experimental evidence for a dismutation equilibrium in the mixed-valence (MV) [Mn+ -M(n+1)+] system type has been elusive and its existence can be established only when the oxidation-reduction processes involved are ...
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(Academic Press Inc., 2000)The organization of the cytoskeleton in the early first interphase zygote and its involvement in organelle redistribution were studied in the glossiphoniid leech Theromyzon trizonare by confocal and electron microscopy, ...
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(2000)We present a graphic model that explores the effect of distance between parent plants on seed predation and seedling recruitment. Based on the assumption that distance between parents may affect the shape of the seed shadow, ...
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(American Association for the Advancement of Science, 2000)Fossil rodent middens and wetland deposits from the central Atacama Desert (22°to 24°S) indicate increasing summer precipitation, grass cover, and groundwater levels from 16.2 to 10.5 calendar kiloyears before present (ky ...
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(S. Karger AG, 2000)A cross-species morphometric study of the corpus callosum was performed in the rat, rabbit, cat, dog, horse, cow and human. Across species, the results indicate a strong, although less than linear, dependency of callosal ...
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(2000)Sophora comprises 45-50 species of worldwide distribution, but no general proposal as to the evolution of this group has been put forth. We used cladistic relationships of the quinolizidine alkaloids (matrine, sparteine, ...
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Excitation, inhibition, and suppression by odors in isolated toad and rat olfactory receptor neurons (2000)Vertebrate olfactory receptor neurons (ORNs) exhibit odor-induced increases in action potential firing rate due to an excitatory cAMP-dependent current. Fish and amphibian ORNs also give inhibitory odor responses, manifested ...
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(2000)The diversity of native species assemblages and that of indigenous cultures that once characterized the temperate forests of southern Chile have experienced a process of homogenization ever since the Spanish conquest. Today ...
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(2000)Nothofagus species from Chile and New Zealand were surveyed in the field for invertebrate abundance and leaf feeding damage and in the laboratory for antifeedant activity against leafrollers (Ctenopsteustis obliquana, ...
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Climate, fire, and vegetation between about 13,000 and 9200 14C yr B.P. in the Chilean Lake District (Academic Press Inc., 2000)A pollen record from Lago Condorito (41°45'S, 73°07'W) shows that North Patagonian Rain Forest taxa predominated between about 13,000 and 12,200 14C yr B.P. in the lowlands of southern Chile, near the city of Puerto Montt. ...
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(Elsevier, 2000)Recent literature results on inorganic models related to metalloenzymes which transport electrons or activate small molecules are discussed in this review. The molecular systems are essentially restricted to macrocyclic ...
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(2000)The ability to germinate under a variety of environmental conditions is essential for plant species inhabiting a wide range of altitudes and latitudes. Phacelia secunda J. F. Gmel. (Hydrophyllaceae) is a perennial herb ...
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(2000)The influence of wheat (Triticum aestivum L.) resistance, the parasitoid Aphidius rhopalosiphi De Stephani-Perez (Hymenoptera: Braconidae) and the entomopathogenic fungus Pandora neoaphidis (Remaudiere et Hennebert) Humber ...
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(2000)It was hypothesized that (1) previous experience of aphids on a host plant leads to differences in their feeding behavior relative to aphids without previous experience on it and that (2) a change in the physiological state ...
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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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(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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(IOP, 2000)We analyze the thickness and temperature dependence of the resistivity for several gold films on mica reported by Sambles, Elsom and Jarvis. Data analysis proceeds according to an iteration procedure proposed recently, ...
