Browsing by Title Facultad de Ciencias
Now showing items 3974-3993 of 8181
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(1991)The investigation of three Stevia species afforded a large variety of known sesquiterpene lactones as well as one new guaianolide, two known longipinene derivatives, two ent-labdanes and several other common compounds. © 1991.
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(Hüthig- Heidelberg, 1988)Al/S dem Cllloroform-Exlrakl da oberirdisclren Teile I'on Cemaurea clrilellsis IIIld Celltaurea floccosa II'I/rden ZII-ei hekallll/e Guaiallolit/e i.wlierr, 811-aCCIOXI'l/elrl'dmcoslu.\· laclO/I I 11I11/ cy"aropicri" 2. ...
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(Universidad de Chile, 2008)Regeneration of lenga (the main timber resource of south of Chile and Argentina) is presumed to be hampered by browsing by guanacos. Thus, in order to elucidaie the factors that affect herbivory on lenga, in this work ...
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(Wiley, 2021)There has been much recent interest in the concept of rewilding as a tool for nature conservation, but also confusion over the idea, which has limited its utility.We developed a unifying definition and 10 guiding principles ...
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(Universidad de Chile, 2014)El cambio climático ha generado la preocupación internacional por las consecuencias adversas que este puede generar, por lo que ha impulsado a las organizaciones e instituciones a profundizar su conocimiento respecto a ...
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(Finnish Zoological and Botanical Publishing Board, 2009)To date, digestive flexibility has been studied in dozens of vertebrate species. However, practically all of these works has ignored the importance of intraspecific physiological variability across populations inhabiting ...
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(2016)We report an experimental study on the effect of solvents on the model SNAr reaction between 1-chloro-2,4dinitrobenzene and morpholine in a series of pure ionic liquids (IL). A significant catalytic effect is observed with ...
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(Frontiers Media, 2022)An experimental and computational methodology for the analysis of the Lewis acid/base responses of ionic liquids (ILs) and deep eutectic solvents (DES) is proposed. It is based on the donor and acceptor of the electronic ...
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(Elsevier Ltd, 1997)Discrete nonautonomous nonlinear systems possessing (h, k)-trichotomies are considered. We specialize to the case of solutions moving inside - and in a neighborhood of - an invariant manifold of a special kind, which we ...
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(PERGAMON-ELSEVIER SCIENCE LTD, 2011-08)We use fixed-point theory to obtain h-asymptotic stability results about the zero solution of nonlinear differential equations with functional delay. Neither boundedness of the deviations nor a fixed sign on the coefficients ...
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(SPRINGER, 2008-06)Hydrogen cyanamide (HC) is widely used to induce the breakage of endodormancy (ED) in grape and other deciduous fruit crop, though its mechanism of action is poorly understood. Applications of HC to grapevine buds ...
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(2013)The Torrent Duck (Merganetta armata) inhabits the torrential rivers of the Andean mountains. As part of a long-term study, two rivers important for hydroelectric production were surveyed in Central Chile. Monthly indices ...
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(2004)Native forests in Chile have been replaced by exotic plantations, generating a mosaic of forest fragments immersed in a matrix of plantations and farms. This landscape change could affect habitat availability for native ...
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(Sociedad Chilena de Neurología, Psiquiatría y Neurocirugía, 1987)In this work we flIIIllyze the problem fo human conciousness from a monist point of view, including the actual knowledge in neurobiology. Three questions are discussed: 1. Can we localize human conciousness in certain ...
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(Universidad de Chile, 2009)
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(BLACKWELL, 2008-05)The existence of latitudinal gradients in species richness and their abundance is known for many free living organisms but few cases have been reported for parasitic diseases. In addition, asymmetries between the Northern ...
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(OXFORD UNIV PRESS, 2013-09)We present solutions for Hall equilibria applicable to neutron star crusts. Such magnetic configurations satisfy a Grad–Shafranov-type equation, which is solved analytically and numerically. The solutions presented cover ...
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(SciELO Agencia Nacional de Investigacion y Desarrollo (ANID), 2020)
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(American Chemical Society and American Society of Pharmacognosy, 2000-03-15)(S)-(+)-Boldine (1) was brominated, chlorinated, and iodinated using molecular bromine in acetic acid or N-halosuccinimides in trifluoroacetic acid. Initial halogenation occurs at C-3, followed (in the cases of chlorine ...
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(Elsevier Science Ltd., 2002-12-19)Cytisine (cy) is a potent and competitive partial agonist at α4 subunit-containing nicotinic acetylcholine (nACh) receptors while at homomeric α7-nACh receptors it behaves as a full agonist with a relatively lower potency. ...
