Browsing by Title Artículos de revistas
Now showing items 4859-4878 of 4968
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(National Academic Sciences, 2016)Loss of megafauna, an aspect of defaunation, can precipitate many ecological changes over short time scales. We examine whether megafauna loss can also explain features of lasting ecological state shifts that occurred as ...
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(Elsevier, 2020)Antimicrobial compounds are found in a range of environments as pollutants. Here, we evaluated the influence of two common anions, NO3- and PO43-, on ciprofloxacin adsorption on humic acid/ferrihydrite composite (HADIG/Fh), ...
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(Wiley, 2017)The distribution of suitable habitat influences natal and breeding dispersal at small spatial scales, resulting in strong microgeographic genetic structure. Although environmental variation can promote interpopulation ...
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(Frontiers Media, 2022)The giant kelp Macrocystis pyrifera is a cosmopolitan species of cold-temperate coasts. Its South-American distribution ranges from Peru to Cape Horn and Argentina, encompassing a considerable temperature gradient, from ...
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(2003)A study was performed on the variation of the electrophilicity index along the reaction path. Implications within the widely used finite difference approximation for density-functional based reactivity descriptors, their ...
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(Elsevier Ltd, 1997)
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(Springer, 2013)This study investigates the variations in the chemical profile, free radical scavenging, antioxidant and gastroprotective activities of licorice extracts (LE) from plants harvested during the months of February to November. ...
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(1986)Examination of six samples of the red alga P. cartilagineum collected along 1600 km of Central Chilean coast yielded a number of polyhalogenated monocyclic monoterpenes. Acyclic compounds were not found. Two common compounds ...
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(Natural Product Incorporation, 2014)Ethanol extracts from dried leaves of wild Lepechinia salvia (Lindl) Epling, collected during the flowering period (September-November), contained 15% to 25% carnosic acid and 2 to 8% carnosol, depending on the month of ...
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(1974)The inversion of Rayleigh wave dispersion data for the Pacific Ocean shows that lithospheric thickness increases systematically with age. The lid to the low-velocity channel is very thin or absent near the ridge crest; the ...
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(2004)We have studied the mechanism of action of three 6a(R)-1,2- methylenedioxyaporphines as vasorelaxant compounds. The alkaloids assayed showed different affinities for the three human cloned α1- adrenoceptor (AR) subtypes ...
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(2012)We compared the diversity of vines and vascular epiphytes among an evergreen forest fragment (Laureliopsis philippiana y Eucryphia cordifolia) and four fragments of secondary forest dominated for Nothofagus obliqua in an ...
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Vascular reactivity in intrapulmonary arteries of chicken embryos during transition to ex ovo life (2002)The present study aimed to characterize pulmonary vascular reactivity in the chicken embryo from the last stage of prenatal development and throughout the perinatal period. Isolated intrapulmonary arteries from noninternally ...
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(Elsevier GmbH, 2018)© 2018 Background: Xenophyllum poposum is an endemic species of the Andes Cordillera, popularly known as Popusa. Popusa is widely used by mountain communities as a folk medicine to treat altitude sickness and hypertension. ...
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(1995)1. 1. A novel vasorelaxant effect of clonixinate of l-lysine (Clx), analgesic and anti-inflammatory, was studied in rat aortic rings. 2. 2. Clx completely relaxed aortic rings contracted by KCl 70 mM and together with its ...
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(2009)The absolute configuration of the pentacyclic ichthyotoxin stypotriol, a constituent of Stypopodium zonale, was deduced to be 3S,5R,8R,9R,10S,13S,14S-(-) -1 by vibrational circular dichroism spectroscopy of the derived ...
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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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(2002)Research in pristine forests provides a necessary reference of energy and nutrient cycling in absence of anthropogenic influence. Therefore two unpolluted watersheds in the Cordillera de Piuchué of southern Chile (42°30′ ...
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(2012)Pollen and charcoal analysis from Laguna San Pedro (38°26'S, 71°19'W), a small closed-basin lake located within the present-day distribution of Araucaria- Nothofagus forest in the Temperate-Mediterranean Transition zone ...