Browsing by Title Artículos de revistas
Now showing items 3879-3898 of 4966
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(1991)A new dimeric alkaloid 1 has been isolated from Schizanthusgrahamiiand its structure determined by spectroscopic methods. © 1991, American Chemical Society. All rights reserved.
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(AMER CHEMICAL SOC, 2011-01)Three tropane alkaloids, named schizanthines N, O, and P (1-3), have been isolated from the crude alkaloid extract of the endemic Chilean plant Schizanthus tricolor. On the basis of extensive NMR studies and MS fragmentation ...
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(Elsevier, 2013)Three different pollination syndromes (bee, hummingbird and moth-pollination syndromes) have been described for the different species of the genus Schizanthus Ruiz & Pav. (Solanaceae). Two closely related species from a ...
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(Amer Chemical Soc, 2015)Seeking economic growth and job creation to tackle the nation's extreme poverty, the Nicaraguan government awarded a concession to build an interoceanic canal and associated projects to a recently formed Hong Kong based ...
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(BIOMED CENTRAL, 2016)Background: Amylases and cellulases have great potential for application in industries such as food, detergent, laundry, textile, baking and biofuels. A common requirement in these fields is to reduce the temperatures of ...
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(2004)A simple solid phase spectrophotometric method for both screening of eight transition metal ions plus lead and quantitative determination of copper, cadmium and zinc is described. The method is based on the preparation of ...
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(American Chemical Society, 2001)A thorough quantitative analysis of the HSAB principle is performed. Complex formation reactions of a typical soft acid, Ag+, and typical hard acid, HF, with the bases XH3 (X = N, P, As) are studied using the DFT/B3LYP ...
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(2011)The present article applies and compares three split-window (SW) algorithms, which allowed the estimation of sea surface temperature using data obtained from the Advanced Very High Resolution Radiometer (AVHRR) on board ...
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(1994)Ionic fluxes play a key role in the activation of respiration and motility, in chemotaxis, and in the acrosome reaction of sea urchin spermatozoa, and therefore in fertilization. There is growing evidence that ion channels ...
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(2014)Protein phosphorylation is the most common post-translational modification that regulates several pivotal functions in cells. Cyclin-dependent kinase 5 (Cdk5) is a proline-directed serine/threonine kinase which is mostly ...
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(2013)The evolution and functions of avian and mammalian antipredator calls are well understood, which contrasts with a lack of progress in reptiles. Here, we present the first investigation of the functions of a distress call ...
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(PERGAMON-ELSEVIER SCIENCE LTD, 2008-04)1. We studied physiological thermal adaptation in the lizard Microlophus atacamensis along a latitudinal range. 2. Field body temperatures were independent from thermal environmental conditions, and show seasonal, but not ...
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(Sociedad Chilena de Química, 2020)Total concentrations of trace elements can provide fundamental information on the sediment contamination levels of the pollution indexes and the quality guidelines for sediment risk assessment. However, this information ...
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(University of California Press, 1996)
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(Canadian Science Publishing, 2018)© Her Majesty the Queen in right of Canada 2018. Most animals must cope with seasonal fluctuations in environmental conditions, including variations in food availability and composition. Accordingly, it is expected that ...
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(SOCIEDAD BIOLGIA CHILE, 2005-06)Passerines lack functional salt glands and to a large extent avoid feeding on marine invertebrates. An exception is Cinclodes nigrofulnosits. Previous studies reported that the contents of its gastrointestinal tract had a ...
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(WILEY-LISS, DIV JOHN WILEY & SONS INC, 2010-10-21)The understanding of animal functioning in fluctuating environments is a major goal of physiological and evolutionary ecology. In temperate terrestrial habitats, one of the most pervasive changes in environmental conditions ...
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(2009)One of the most fundamental questions in organismal ecology is how animals work in a continuously changing environment. In order to contribute to the current understanding of this question, this study evaluated seasonal ...
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(2013)The roles of testosterone (T) during reproduction are often complex and vary among and within vertebrate taxa and locations, making general hypotheses relating T to breeding behavior and success difficult to integrate. In ...
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(1994)Experiments were undertaken to obtain information on the effects of season on endocrine function and testicular morphology in male vicunña. Serial blood samples were taken every 15 min over 4-8 h in February and August: ...