Base de dados : LILACS
Pesquisa : A08.675.650.850.625.660 [Categoria DeCS]
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Texto completo SciELO Chile
Texto completo
Id: lil-692196
Autor: Muñoz, Yorka; Fuenzalida, Karen; Bronfman, Miguel; Gatica, Arnaldo; Sepúlveda, Marcelo; Bacigalupo, Juan; Roth, Alejandro D; Delgado, Ricardo.
Título: Fatty acid composition of Drosophila photoreceptor light-sensitive microvilli
Fonte: Biol. Res;46(3):289-294, 2013. ilus, graf, tab.
Idioma: en.
Resumo: Phototransduction, the mechanism underlying the electrical response to light in photoreceptor cells, has been thoroughly investigated in Drosophila melanogaster, an essential model in signal transduction research. These cells present a highly specialized photosensitive membrane consisting of thousands of microvilli forming a prominent structure termed a rhabdomere. These microvilli encompass the phototransduction proteins, most of which are transmembrane and exclusively rhabdomeric. Rhabdomere membrane lipids play a crucial role in the activation of the transient receptor potential ionic channels (TRP and TRPL) responsible for initiating the photoresponse. Despite its importance, rhabdomere lipid composition has not been established. We developed a novel preparation enriched in rhabdomere membranes to perform a thorough characterization of the lipidomics of Drosophila rhabdomeres. Isolated eyes (500) were homogenized and subjected to a differential centrifugation protocol that generates a fraction enriched in rhabdomere membrane. Lipids extracted from this preparation were identified and quantified by gas chromatography coupled to mass spectrometry. We found an abundance of low sterol esters (C16:0, C18:0), highly abundant and diverse triglycerides, free fatty acids, a moderate variety of mono and diacyglycerols (C:16:0, 18:0, C18:1) and abundant phospholipids (principally C18:2). This preparation opens a new avenue for investigating essential aspects of phototransduction.
Descritores: Proteínas de Drosophila/química
Drosophila melanogaster/química
Ácidos Graxos/análise
Células Fotorreceptoras de Invertebrados/química
Canais de Receptores Transientes de Potencial/química
-Proteínas de Drosophila/análise
Transdução de Sinal Luminoso/fisiologia
Transporte Proteico/fisiologia
Canais de Receptores Transientes de Potencial/análise
Limites: Animais
Tipo de Publ: Research Support, Non-U.S. Gov't
Responsável: CL1.1 - Biblioteca Central

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Id: lil-511223
Autor: Peña García, Luis; Coria De La Hoz, Marcelo.
Título: La evolución de los ojos / The evolution of the eyes
Fonte: Arch. chil. oftalmol;65(1):29-42, 2008. ilus.
Idioma: es.
Resumo: La evolución de los ojos comenzó cuando comenzó la vida misma. Incluso las formas de vida más simples, las bacterias, tienen las primeras proteínas fotosensibles. Desde las bacterias la vida y la visión evolucionaron hacia una asombrosa variedad y complejidad: ojos telescópicos, ojos especulares, ojos tipo cámara, todos ellos con un solo origen.

The evolution ofthe eyes began when the life itself began. Even the simplest life forms, the bacteria, have the first photosensitive proteins. From the bacteria, the life and the vision evolved towards an astonishing variety and complexity: telescope eyes, mirror eyes, camera eyes, between many others, all ofthem with a single source.
Descritores: Evolução Biológica
Olho/anatomia & histologia
Olho/crescimento & desenvolvimento
-Células Fotorreceptoras de Invertebrados
Células Fotorreceptoras de Vertebrados
Limites: Humanos
Responsável: CL1.1 - Biblioteca Central

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Id: lil-228524
Autor: Bacigalupo, J; O'Day, P. M.
Título: The second messenger for visual excitation in invertebrate phototransduction
Fonte: Biol. Res;29(3):319-24, 1996.
Idioma: en.
Resumo: Invertebrate visual transduction involves a second messenger cascade process that leads to an increase in membrane conductance. The identity of the second messenger that gates the light-dependent channels is presently a major focus of attention. Cyclic GMP, inositol trisphosphate and Ca2+ are the most likely candidates for being such a messenger in the species studied so far. Here we review the available evidence for each of these molecules
Descritores: Transdução de Sinal Luminoso/fisiologia
Células Fotorreceptoras de Invertebrados/fisiologia
Sistemas do Segundo Mensageiro/fisiologia
-Canais de Cálcio/fisiologia
GMP Cíclico/fisiologia
Inositol 1,4,5-Trifosfato/fisiologia
Limites: Animais
Tipo de Publ: Research Support, Non-U.S. Gov't
Responsável: BR1.1 - BIREME

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