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	Provedor de dados Anais da ABC (AABC) (2) BJMBR (1) Autor BENNATON,JOCELYN (1) FERNANDES-DE-LIMA,VERA M. (1) HANKE,WOLFGANG (1) HOLTHOFF,KNUT (1) KOGLER,JOÃO E. (1) NIERMANN,HEIKE (1) WITTE,OTTO W. (1) Mais... Palavra-chave Spreading depression (3) Intrinsic optic signals (2) Brain growth spurt period (1) Brain slice (1) Central gray matter (1) Early protein malnutrition (1) Extracellular matrix (1) Extracellular space volume (1) Polymers (1) Spatial buffer (1) Volume phase transitions (1) Mais... Tipo do documento Info:eu-repo/semantics/article (2) Info:eu-repo/semantics/other (1) Ano 2001 (2) 1997 (1) País Brazil (3) Idioma Inglês (3)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 3 Primeira ... 1 ... Última Wave onset in central gray matter - its intrinsic optical signal and phase transitions in extracellular polymers Anais da ABC (AABC) FERNANDES-DE-LIMA,VERA M.; KOGLER,JOÃO E.; BENNATON,JOCELYN; HANKE,WOLFGANG. The brain is an excitable media in which excitation waves propagate at several scales of time and space. ''One-dimensional'' action potentials (millisecond scale) along the axon membrane, and spreading depression waves (seconds to minutes) at the three dimensions of the gray matter neuropil (complex of interacting membranes) are examples of excitation waves. In the retina, excitation waves have a prominent intrinsic optical signal (IOS). This optical signal is created by light scatter and has different components at the red and blue end of the spectrum. We could observe the wave onset in the retina, and measure the optical changes at the critical transition from quiescence to propagating wave. The results demonstrated the presence of fluctuations preceding... Tipo: Info:eu-repo/semantics/article Palavras-chave: Intrinsic optic signals; Volume phase transitions; Polymers; Spreading depression; Central gray matter; Extracellular matrix. Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000300006 Cell swelling and ion redistribution assessed with intrinsic optical signals Anais da ABC (AABC) WITTE,OTTO W.; NIERMANN,HEIKE; HOLTHOFF,KNUT. Cell volume changes are associated with alterations of intrinsic optical signals (IOS). In submerged brain slices in vitro, afferent stimulation induces an increase in light transmission. As assessed by measurement of the largely membrane impermeant ion tetramethylammonium (TMA) in the extracellular space, these IOS correlate with the extent and time course of the change of the extracellular space size. They have a high signal to noise ratio and allow measurements of IOS changes in the order of a few percent. Under conditions of reduced net KCl uptake (low Cl solution) a directed spatial buffer mechanism (K syphoning) can be demonstrated in the neocortex with widening of the extracellular space in superficial layers associated with a reduced light... Tipo: Info:eu-repo/semantics/article Palavras-chave: Intrinsic optic signals; Spatial buffer; Brain slice; Extracellular space volume; Spreading depression. Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000300005 Spreading depression is facilitated in adult rats previously submitted to short episodes of malnutrition during the lactation period BJMBR Lactating rat dams were submitted to short episodes (1, 2 or 3 weeks) of nutritional restriction by receiving the "regional basic diet" (RBD, with 8% protein) of low-income human populations of Northeast Brazil. Their pups were then studied regarding the developmental effects on body and brain weights. When the rats reached adulthood, cortical susceptibility to the phenomenon of spreading depression (SD) was evaluated by performing electrophysiological recordings on the surface of the cerebral cortex. SD was elicited at 20-min intervals by applying 2% KCl for 1 min to a site on the frontal cortex and its occurrence was monitored at 2 sites in the parietal region by recording the electrocorticogram and the slow potential change of SD. When compared to... Tipo: Info:eu-repo/semantics/other Palavras-chave: Early protein malnutrition; Spreading depression; Brain growth spurt period. Ano: 1997 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1997000500015 Registros recuperados: 3 Primeira ... 1 ... Última

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