Browsing by Title Facultad de Ciencias
Now showing items 4693-4712 of 8183
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Light-dependent channels from excised patches of Limulus ventral photoreceptors are opened by cGMP (National Academy of Sciences, 1991)The identity of the second menenger that directly activates the light-dependent conductance in invertebrate photoreceptors remains unclear; the available evidence provides some support for cGMP and Ca2+. To resolve this ...
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(Facultad de Agronomía e Ingeniería Forestal, Pontificia Universidad Católica de Chile, 2008-12-22)Carotenoids are colored terpenes synthesized in plants, algae and some yeasts and bacteria. In plants and algae, these lipophilic molecules exert functional roles in hormone synthesis, photosynthesis, photomorphogenesis ...
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(Elsevier, 2019)Drosophila phototransduction occurs in light-sensitive microvilli arranged in a longitudinal structure of the photoreceptor, termed the rhabdomere. Rhodopsin (Rh), isomerized by light, couples to G-protein, which activates ...
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(Springer, 2021)It is showed that complex scalar fields with a self-interaction potential may propagate along null geodesics on isotropic flat Friedmann-Lemaitre-Robertson-Walker universes with different time-dependent scale factors. This ...
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(Universidad de Chile, 2023)La conectividad es uno de los procesos más importantes en la dinámica de poblaciones en ecosistemas marinos. Los estudios de conectividad son fundamentales para determinar procesos que limitan el crecimiento y la resiliencia ...
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(Universidad de Chile, 2011)Extensas áreas de bosque maulino han sido perturbadas desde el siglo XIX debido a su reemplazo por cultivos tradicionales, y posteriormente por plantaciones forestales de especies exóticas, tales como Pinus radiata D. ...
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(Universisdad de Chile, 2004)En la Isla Grande de Chiloe, la explotación de los bosques, incendios y habilitación de zona para la ganadería y agricultura han generado extensas zonas anegadas, frecuentemente dominadas por arbustos como Gaultheria ...
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(SOCIEDAD BIOLOGIA CHILE, 2007-03)Successional shrublands created by clearcutting and burning of forests are frequent in Chiloe Island and surrounding mainland in southern Chile. These areas are characterized by seasonally waterlogged soils, and vegetation ...
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(2009)In agroforestry systems, the effect of shade trees on coffee net photosynthesis (An) has been the object of debates among coffee scientists. In this study, we undertook over 600 coffee An "spot" measurements under four ...
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(Institute of Arctic and Alpine Research, 2017)© 2017 Regents of the University of Colorado. We tested the main hypothesis that nutrient accumulation during late stages of postglacial succession would decrease nutrient limitation of diazotrophic activity. We tested ...
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(SOCIEDAD CHILENA DE QUIMICA, 2006-12)Two medium-sized molecular systems X-60 (X=C,N) were analyzed using Extended Huckel, Density Functional and ab initio Hartree-Fock methods. The aim of the work was to test the reliability of the EHT methodology to calculate ...
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(Nature, 2021)The Andean Altiplano-Puna is located at an elevation of approximately 4000 m.a.s.l. and is delineated by the Western and the Eastern Andes Cordillera. The high-altitude wetlands (HAWs) in the Central Andes are unique ...
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(Universidad de Chile, 2020-11)Presenta a los líquenes como modelo para estudiar la interacción microbiana, una de las líneas de investigación del LEMi_UCh. La importancia de estos organismos y su conservación en los bosques del sur de Chile son el foco ...
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Line Shapes in Infrared Absorption by Solids and by Atomic or Molecular Species Embedded in Solids (AMER CHEMICAL SOC, 2010-07-15)When the target is in the solid state, most infrared spectral features are manifestly asymmetric; hence, a line shape function well-grounded in theory is necessary to ascertain the net energy taken by the associated ...
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(Universidad de Chile, 1989)
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(Amer Physical Soc, 2016)We examine analytically and numerically the spectral properties of three quasi-one-dimensional lattices, namely, kagome, Lieb, and stub lattices, which are characterized for having flatbands in their spectrum. It is observed ...
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(1972)The problem of energy propagation through a one-dimensional open-ended finite chain is critically reexamined. Free end boundary conditions are imposed and quantum-field-theory operators, consistent with these boundary ...
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(1992)For perturbations conditionally integrable. Levinson's theorems are obtained and applied to almost constant systems. © 1992.
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(Elsevier, 2017)In this chapter we present an overview of the excitation, propagation, and absorption of linear plasma waves in collisionless, spatially uniform, multicomponent, magnetized non-Maxwellian plasma characterized by a ...
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(1993)We examine the nature of the singlet excitations introduced recently to describe the spin dynamics of the antiferromagnetic Heisenberg model with anisotropic coupling. It is shown that they excite spin waves polarized ...