Browsing by Title Facultad de Ciencias
Now showing items 6640-6659 of 8181
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(Universisdad de Chile, 2015)Las enzimas juegan un rol fundamental en el metabolismo y la señalización celular. Su importancia radica en la capacidad de catalizar la transformación de un sustrato de manera especifica, en el contexto de su papel en la ...
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(Universidad de Chile, 2015)
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(Laboratorios Mixim S.A., 1974-09-25)The leaves and bark of Cryptocarya alba (Mo\.) Looser (Lauraceae) were examined for alkaloida, and found to contaín a single basic component, whích was isolated and shown to be (+)-reticuline(l). This substance was ...
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(Elsevier GmbH, 2015)© 2014 Elsevier GmbH.Retinoic acid (RA), a vitamin A metabolite, has been attributed to relevant functions in adaptive immunity. On T cells, the disruption on RA signaling alters both CD4+ and CD8+ T cells effector function. ...
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(MDPI, 2016)Vitamin A, a generic designation for an array of organic molecules that includes retinal, retinol and retinoic acid, is an essential nutrient needed in a wide array of aspects including the proper functioning of the visual ...
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(American Museum of Natural History, 2015)
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(2007)Long-term potentiation (LTP) is an activity-dependent strengthening of synapses that is thought to underlie memory storage. Ca2+/ calmodulin-dependent protein kinase II (CaMKII) has been a leading candidate as a memory ...
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(ELSEVIER SCIENCE BV, 2009-05-22)Escherichia coli phosphofructokinase-2 (Pfk-2) is a homodimer whose subunits consist of a large domain and an additional b-sheet that provides the interfacial contacts between the subunits, creating a b-barrel flattened-like ...
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(2002)The stability, refolding, and assembly properties of FtsZ cell division proteins from Methanococcus jannaschii and Escherichia coli have been investigated. Their guanidinium chloride unfolding has been studied by circular ...
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(Pergamon Journals Ltd., 1986-10-28)The structures of three alkaloids isolated from Guatteria dielsiana, 6-methoxyonychine, dielsine and dielsinol, originally described as l-azafluoren-9-ones, are revised to 4-azafluoren-9-ones on the basis of previous synthetic ...
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(Geoscienceworld, 2020)New detrital zircon U-Pb geochronology data from the Cenozoic Magallanes-Austral Basin in Argentina and Chile similar to 51 degrees S establish a revised chronostratigraphy of Paleocene-Miocene foreland synorogenic strata ...
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(Pergamon Journals Ltd., 1986-12-18)Precursor feeding experiments to Annona reticulata leaves demonstrated that coclaurine and reticuline are both derived from the common lntermediate norcoclaurine; furthermore (S)-coclaurlne was found to be the speciflc ...
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(Universidad de Chile., 1980)Se estudian los caracteres meristico-morfometricos y morfología ósea de las poblaciones de Sebastes, en las costas de Chile.
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(Universidad de Chile., 2022)La importante demanda y exigencia de los consumidores de alimentos más sanos y, las estrictas y crecientes regulaciones y normas de los mercados sobre la inocuidad de alimentos exportados, ha generado que los países ...
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(Universidad de Chile, 2011)La normativa ambiental chilena exige que antes de ejecutar un proyecto o implementar modificaciones al mismo, este debe ingresar al Sistema de Evaluación de Impacto Ambiental (SEIA), si las actividades que generan estan ...
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(Sociedad de Biologia de Chile, 2006)Phytoplankton abundance in the surface mixed layer of the coastal ocean responds to environmental changes at various time scales. Here the "warm", "cold" and "neutral" phases of "three environmental cycles" have been jointly ...
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(Springer, 2020)Replacement of native forests by exotic monoculture plantations is the principal driver of land change in central Chile; it reduces the richness and abundance of native mammals. The presence of shrub vegetation in mature ...
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(Springer, 2017-06)Nomadic pastoralism and transhumance are ancient human adaptations to the movements of large herbivores, which themselves migrate to follow favorable environmental conditions. Free-ranging livestock production has been ...
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(Universidad de Chile, 2008)En esta tesis consideramos spreads contenido en un espacio vectorial de dimensión 4, en particular spreuts desargesiano y de Hall. En spreads desarguesinos contamos el numero régulos que contiene y en los Hall encontramos ...
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(ELSEVIER SCIENCE INC, 2010-06-25)Phosphofructokinase-2 (Pfk-2) belongs to the ribokinase family and catalyzes the ATP-dependent phosphorylation of fructose-6-phosphate, showing allosteric inhibition by a second ATP molecule. Several structures have been ...