Short Term Plasticity
Mostrando 1-12 de 59 artigos, teses e dissertações.
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1. Structural and metabolic reorganization of the gut during the fasting and seasonal dormancy in tegu lizards Tupinambis merianae / Reorganização estrutural e metabólica do intestino associada ao jejum e dormência sazonal em lagartos teiú Tupinambis merianae
The gut phenotypic plasticity is widely documented in the vertebrates and would allow to either short term or anticipatory adjustments in the organ functional capacity, to cope with unpredictable and periodic changes of food availability in the environment. This study investigates seasonal changes of morphology and in the capacity for substrate oxidation in
Publicado em: 2009
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2. Expressão de zif-268 durante a aquisição, evocação e extinção de uma memória aversiva
In the behavioral paradigm of discriminative avoidance task, both short and long-term memories have been extensively investigated with behavioral and pharmacological approaches. The aim of the present study was to evaluate, using the abovementioned model, the hippocampal expression of zif-268 - a calcium-dependent immediate early gene involved with synaptic
Publicado em: 2008
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3. Modelação de fenômenos de plasticidade rápida no sistema visual de mamíferos / Modeling Fast Plasticity Phenomena in the Mammalian Primary Visual Cortex
Neurônios do córtex visual primário (V1) são seletivos à orientação, direção e freqüência espacial de estímulos apresentados em seus campos receptivos. Os últimos 40 anos acumularam uma quantidade considerável de teorias e dados sobre o processamento cortical de seletividade. Apesar disso, um consenso sobre os mecanismos que geram preferência
Publicado em: 2006
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4. Germinação, crescimento, atividade fotossintetica e translocação de compostos de carbono em especies arboreas tropicais : estudo comparativo e influencia de sombreamento natural
Gennination, growth, photosynthesis and translocation of carbon in tropical tree species: a comparative study and the influence of natural shade. Light has been recognized as a major factor in species replacement during secondary sucession in forests. The degree of shade tolerance may be important in detennining successional sequences, since these are condit
Publicado em: 1996
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5. Distinct forms of short-term plasticity at excitatory synapses of hippocampus and neocortex
The expression of short- and long-term synaptic plasticity varies strongly across pathways in the central nervous system. Differences in the properties of transmitter release may underlie some of this variability. Here we compared the short-term plasticity displayed by a neocortical and a hippocampal pathway in vitro, and observed dramatic differences. Condi
The National Academy of Sciences of the USA.
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6. Proteolysis of SNARE proteins alters facilitation and depression in a specific way
The molecular mechanisms of short-term plasticity observed during synaptic transmission are unknown. To determine whether the soluble N-ethylmaleimide-sensitive factor attachment protein receptor (SNARE) proteins play a role in short-term plasticity, Botulinum toxins A, E, and F, were used to disrupt SNARE protein function in cultured hippocampal neurons. Al
National Academy of Sciences.
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7. Role of the calcium-binding protein parvalbumin in short-term synaptic plasticity
GABAergic (GABA = γ-aminobutyric acid) neurons from different brain regions contain high levels of parvalbumin, both in their soma and in their neurites. Parvalbumin is a slow Ca2+ buffer that may affect the amplitude and time course of intracellular Ca2+ transients in terminals after an action potential, and hence may regulate short-term synaptic pla
The National Academy of Sciences.
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8. Receptive field structure in the visual cortex: does selective stimulation induce plasticity?
Sensory areas of adult cerebral cortex can reorganize in response to long-term alterations in patterns of afferent signals. This long-term plasticity is thought to play a crucial role in recovery from injury and in some forms of learning. However, the degree to which sensory representations in primary cortical areas depend on short-term (i.e., minute to minu
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9. In vivo activity-dependent plasticity at cortico-striatal connections: Evidence for physiological long-term potentiation
The purpose of the present study was to investigate in vivo the activity-dependent plasticity of glutamatergic cortico-striatal synapses. Electrical stimuli were applied in the facial motor cortex and intracellular recordings were performed in the ipsilateral striatal projection field of this cortical area. Recorded cells exhibited the typical intrinsic memb
The National Academy of Sciences of the USA.
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10. Long-term but not short-term plasticity at mossy fiber synapses is impaired in neural cell adhesion molecule-deficient mice
Cell adhesion molecules (CAMs) are known to be involved in a variety of developmental processes that play key roles in the establishment of synaptic connectivity during embryonic development, but recent evidence implicates the same molecules in synaptic plasticity of the adult. In the present study, we have used neural CAM (NCAM)-deficient mice, which have l
The National Academy of Sciences.
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11. Very short-term plasticity in hippocampal synapses
Hippocampal pyramidal neurons often fire in bursts of action potentials with short interspike intervals (2–10 msec). These high-frequency bursts may play a critical role in the functional behavior of hippocampal neurons, but synaptic plasticity at such short times has not been carefully studied. To study synaptic modulation at very short time intervals, we
The National Academy of Sciences of the USA.
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12. Short-term plasticity of the visuomotor map during grasping movements in humans
During visually guided grasping movements, visual information is transformed into motor commands. This transformation is known as the “visuomotor map.” To investigate limitations in the short-term plasticity of the visuomotor map in normal humans, we studied the maximum grip aperture (MGA) during the reaching phase while subjects grasped objects of vario
Cold Spring Harbor Laboratory Press.