Barrage
Mostrando 13-24 de 25 artigos, teses e dissertações.
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13. Análise da eficiência da escada para peixes no Ribeirão Garcia no município de Blumenau-SC
Os peixes, como toda comunidade biológica, fazem parte de um sistema. Algumas espécies desenvolveram estratégias próprias, envolvendo perdas mínimas de energia quando migram em direção à nascente do rio para realizarem seu ciclo reprodutivo. Entretanto, a construção de barragens ao longo do leito dos rios tem afetado a dinâmica populacional de mui
Publicado em: 2005
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14. Ãgua: recurso desencadeador de conflitos? os impactos sociais da construÃÃo da barragem pirapama
This work presents a quarrel on the current social movements as instrument of conquest and exercise of the citizenship. The small agricultural producers have so much time difficulties to keep the minimum conditions for its survival. The great projects and workmanships for the economic development with the construction of hidrelÃtricas and barrages for the w
Publicado em: 2004
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15. Variations spatio-temporelles des matieres en suspension dans I'estuaire du Sinnamary, Guyane française: influence du barrage hydroélectrique de Petit Saut
O litoral da Guiana Francesa sotre a influência do sistema de dispersão de sedimentos do rio Amazonas, sob ação dos Alísios, das correntes e da posição da Zona Intertropical de Convergência. A partir de 1994, o rio Sinnamary foi modificado com a construção da bmagem hidroelétrica de IIPetit Saut". A variação das concentrações de materiais em s
Rev. Bras. Oceanogr.. Publicado em: 2000
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16. Tagged versus untagged libraries: methods for the generation and screening of combinatorial chemical libraries.
Over the past two decades the pharmaceutical industry has been driven by the biological sciences. The discovery and description of the biological mechanisms that underlie disease states accompanied by an unraveling of these mechanisms has provided drug, and more recently biotechnological, companies with a barrage of new therapeutic targets. Paradoxically, as
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17. Five ethical doctrines for medical education.
In recent years a relative barrage of journal articles has surfaced concerning the formal instruction of medical ethics in our medical schools. Philosophical debates usually ensue over either the conspicuous absence (or, in some cases, the questionable need (I) (2) of a formal ethics course, or the manner and method by which ethics is to be taught (3). There
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18. Muscarinic amplification of fast excitation in hilar neurones and inhibition in granule cells in the guinea-pig hippocampus.
1. Effects of the cholinergic agonist, carbachol (CCh), or the acetylcholinesterase inhibitor, eserine, on presumed inhibitory hilar neurones and on inhibition in granule cells were studied by intracellular recording in guinea-pig hippocampal slices. 2. CCh (1-5 microM) strongly enhanced the discharge activity of hilar neurones and spontaneous and evoked IPS
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19. Nicotinic and muscarinic ACh receptors in rhythmically active spinal neurones in the Xenopus laevis embryo.
1. Intracellular recordings were made from presumed motoneurones in the Xenopus embryo spinal cord, and their response to cholinergic agents was investigated. Nicotine and 1,1-dimethyl-4-phenylpiperazinium (DMPP; both 1-10 microM) strongly depolarized, and muscarine and oxotremorine (2-20 microM) weakly hyperpolarized, these neurones. Tetrodotoxin (1 microM)
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20. Muscle but not cutaneous C-afferent input produces prolonged increases in the excitability of the flexion reflex in the rat.
Stimulation of cutaneous afferent fibres in the sural nerve and muscle afferent fibres in the gastrocnemius-soleus nerve at a strength that excites C axons produces a delayed and long-lasting burst of activity in posterior biceps femoris/semitendinosus flexor motoneurones. Following a 20 s stimulation at 1 Hz to the sural nerve the flexor motoneurones contin
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21. The action of zinc on synaptic transmission and neuronal excitability in cultures of mouse hippocampus.
1. The whole-cell configuration of the patch clamp method was used to record from hippocampal neurones in cell culture. Synaptic responses were evoked by loose patch stimulation of adjacent presynaptic neurones in low-density cultures. Agonists and antagonists were applied rapidly, using an array of flow pipes each of diameter 250 microns, positioned within
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22. Role of the ferret perigeniculate nucleus in the generation of synchronized oscillations in vitro.
1. The cellular mechanisms by which neurons of the ferret perigeniculate nucleus (PGN) participate in the generation of spindle waves and slowed absence seizure-like oscillations were investigated with intracellular and extracellular recording techniques in geniculate slices maintained in vitro. 2. During spindle wave generation, PGN neurons generated repeti
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23. Mechanisms of action of acetylcholine in the guinea-pig cerebral cortex in vitro.
The mechanisms of action of acetylcholine (ACh) in the guinea-pig neocortex were investigated using intracellular recordings from layer V pyramidal cells of the anterior cingulate cortical slice. At resting membrane potential (Vm = -80 to -70 mV), ACh application resulted in a barrage of excitatory and inhibitory post-synaptic potentials (p.s.p.s) associated
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24. Synaptic input from CA3 pyramidal cells to dentate basket cells in rat hippocampus.
1. Excitatory inputs from CA3 pyramidal cells to dentate basket cells were examined using the whole-cell recording technique in neonatal (10-16 days) rat hippocampal slices to characterize this unexpected feedback pathway. 2. Minimal electrical stimulation of the CA3 pyramidal layer evoked in basket cells short latency (5.2 +/- 0.4 ms) glutamate receptor-med