Cholinergic Stimulus
Mostrando 1-12 de 49 artigos, teses e dissertações.
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1. Glycogen metabolism alterations of fed and fast diabetic rats salivary glands after secretagogues injection / Alterações do metabolismo de glicogênio das glândulas salivares de ratos diabéticos alimentados e em jejum após a injeção de sialogogos
O processo de secreção salivar é dependente de energia, consome glicose e pode mobilizar glicogênio na glândula submandibular. Nos ratos diabéticos a produção de saliva estimulada é reduzida e ocorre acúmulo de glicogênio nas glândulas parótida e submandibular. O objetivo deste trabalho foi avaliar in vivo o metabolismo de glicogênio das glând
Publicado em: 2008
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2. Immunohistochemical characterization of the chick marginal retina
The retina is a highly differentiated tissue with a complex layered structure that has been extensively characterized. However, most of the previous studies focused on the histology of the central retina while little is known about the cellular composition, organization and function of the marginal retina. Recent research has identified a subpopulation of mu
Brazilian Journal of Medical and Biological Research. Publicado em: 2007-11
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3. Inotropic effect of Citrus sinensis (L.) Osbeck leaf extracts on the guinea pig atrium
The objective of the present investigation was to determine the contractile effect of crude and acetone leaf extracts of Citrus sinensis (L.) Osb. on mammalian myocardium. Crude leaf extracts have been used in folk medicine to treat neurological disorders. Some flavonoids isolated from this plant presented a positive inotropic effect on myocardium. This moti
Brazilian Journal of Medical and Biological Research. Publicado em: 2005-01
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4. Cholinergic-opioidergic interaction in the central amygdala induces antinociception in the guinea pig
Several studies have demonstrated the involvement of the central nucleus of the amygdala (CEA) in the modulation of defensive behavior and in antinociceptive regulation. In a previous study, we demonstrated the existence of a cholinergic-opioidergic interaction in the CEA, modulating the defensive response of tonic immobility in guinea pigs. In the present s
Brazilian Journal of Medical and Biological Research. Publicado em: 2004-10
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5. The brain decade in debate: VI. Sensory and motor maps: dynamics and plasticity
This article is an edited transcription of a virtual symposium promoted by the Brazilian Society of Neuroscience and Behavior (SBNeC). Although the dynamics of sensory and motor representations have been one of the most studied features of the central nervous system, the actual mechanisms of brain plasticity that underlie the dynamic nature of sensory and mo
Brazilian Journal of Medical and Biological Research. Publicado em: 2001-12
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6. Intramural mechanism of esophageal peristalsis: roles of cholinergic and noncholinergic nerves.
We examined the role of peripheral cholinergic and noncholinergic mechanisms in esophageal peristalsis. Intramural nerve elements in rings of circular muscle from six different levels of the opossum esophagus were stimulated transmurally so as to cause neurally mediated muscle contractions. Stimulus frequency was varied from 2 to 40 Hz. An increase in stimul
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7. Effects of muscarinic blockade in perirhinal cortex during visual recognition
Stimulus recognition in monkeys is severely impaired by destruction or dysfunction of the perirhinal cortex and also by systemic administration of the cholinergic-muscarinic receptor blocker, scopolamine. These two effects are shown here to be linked: Stimulus recognition was found to be significantly impaired after bilateral microinjection of scopolamine di
National Academy of Sciences.
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8. Cholinergic Modulation of Visual Attention and Working Memory: Dissociable Effects of Basal Forebrain 192-IgG-saporin Lesions and Intraprefrontal Infusions of Scopolamine
Two experiments examined the effects of reductions in cortical cholinergic function on performance of a novel task that allowed for the simultaneous assessment of attention to a visual stimulus and memory for that stimulus over a variable delay within the same test session. In the first experiment, infusions of the muscarinic receptor antagonist scopolamine
Cold Spring Harbor Laboratory Press.
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9. Non-cholinergic excitatory and inhibitory junction potentials in the circular smooth muscle of the guinea-pig ileum.
Intracellular micro-electrodes have been used to record evoked non-cholinergic junction potentials from the muscle layers of strips of guinea-pig ileum cut parallel to the longitudinal muscle. Transmural stimulation with single pulses, 0.6 ms duration produced inhibitory junction potentials (i.j.p.s) in the circular muscle layer. In the circular muscle layer
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10. Substance P is a functional neurotransmitter in the rat parotid gland.
The technique of electrical field stimulation was employed to stimulate the intrinsic nerves of isolated rat parotid gland fragments. Responses to field stimulation were recorded as changes in enzyme secretion (amylase release), radiolabelled ion fluxes (86Rb efflux) and electrophysiological effects (changes in acinar cell membrane potential and input resist
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11. Galantamine Facilitates Acquisition of Hippocampus-Dependent Trace Eyeblink Conditioning in Aged Rabbits
Cholinergic systems are critical to the neural mechanisms mediating learning. Reduced nicotinic cholinergic receptor (nAChR) binding is a hallmark of normal aging. These reductions are markedly more severe in some dementias, such as Alzheimer's disease. Pharmacological central nervous system therapies are a means to ameliorate the cognitive deficits associat
Cold Spring Harbor Laboratory Press.
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12. Characteristics of the vagally driven non-adrenergic, non-cholinergic inhibitory innervation of ferret gastric corpus.
This paper reports a quantitative in vivo study on the vagal activation of the intramural non-adrenergic, non-cholinergic inhibitory nerves in the ferret gastric corpus. The nature of the inhibitory neurotransmitter was also investigated. In the atropinized, guanethidine-treated, urethane-anaesthetized ferret, electrical stimulation (10 s at 20 V, 1-20 Hz, 0