Ac Conductance
Mostrando 1-12 de 30 artigos, teses e dissertações.
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1. An Investigation of Ac Impedance and Dielectric Spectroscopic Properties of Conducting Chitosan-silane Crosslinked-poly (Vinyl Alcohol) Blended Films
The films of chitosan (CS)-silane crosslinked-poly(vinyl alcohol) (PVA) with different weight % were prepared. The effect on conductivity of CS/PVA blended films due to change in the concentration of PVA and temperature was investigated by impedance spectroscopy and showed good conductance properties. The complex impedance plots revealed single semicircular
Mat. Res.. Publicado em: 03/11/2015
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2. Proton magnetic resonance spectroscopy of the frontal, cingulate and perirolandic cortices and its relationship to skin conductance in patients with schizophrenia
The aim of the present study was to determine whether specific subgroups of schizophrenic patients, grouped according to electrodermal characteristics, show differences in the N-acetylaspartate/creatine plus choline (NAA / (Cr + Cho)) ratios in the frontal, cingulate and perirolandic cortices. Skin conductance levels (SCL) and skin conductance responses to a
Brazilian Journal of Medical and Biological Research. Publicado em: 2008-12
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3. Rustificação de plantas jovens de Coffea arabica L.
Plantas jovens de Coffea arabica enxertadas sobre C. canephora foram submetidas a 6 ciclos de suspensão de rega (CR) durante 35 dias. Cada CR foi acompanhado até que a fotossíntese líquida (PN) fosse próxima de zero ou até que o potencial hídrico foliar (Ψ) fosse próximo de -2.0 MPa nos cultivares Acauã (AC), Mundo-Novo (MN) e Obatã (OB). Apó
Publicado em: 2007
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4. Effects of diet and exercise training on neurovascular control during mental stress in obese women
Since neurovascular control is altered in obese subjects, we hypothesized that weight loss by diet (D) or diet plus exercise training (D + ET) would improve neurovascular control during mental stress in obese women. In a study with a dietary reduction of 600 kcal/day with or without exercise training for 4 months, 53 obese women were subdivided in D (N = 22,
Brazilian Journal of Medical and Biological Research. Publicado em: 2006-01
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5. Participation of ATP-sensitive K+ channels in the peripheral antinociceptive effect of fentanyl in rats
We examined the effect of several K+ channel blockers such as glibenclamide, tolbutamide, charybdotoxin (ChTX), apamin, tetraethylammonium chloride (TEA), 4-aminopyridine (4-AP), and cesium on the ability of fentanyl, a clinically used selective µ-opioid receptor agonist, to promote peripheral antinociception. Antinociception was measured by the paw pressur
Brazilian Journal of Medical and Biological Research. Publicado em: 2005-01
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6. Sera from chronic chagasic patients depress cardiac electrogenesis and conduction
We report results obtained with sera from 58 chronic chagasic patients that were evaluated for effects on heart rate and atrioventricular (AV) conduction in isolated rabbit hearts and screened for the presence of muscarinic and beta-adrenergic activity. We show that sera from 26 patients decreased heart rate, while 10 increased it and 22 had no effect. Addit
Brazilian Journal of Medical and Biological Research. Publicado em: 2000-04
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7. Electronic transport through a quantum point contact / Condução eletrônica através de um contato quântico pontual
Neste trabalho é apresentado o cálculo, pelo grupo de renormalização numérico, da condutância AC através de uma nanoestrutura acoplada a gases eletrônicos, a baixa temperatura e no regime de resposta linear. Este sistema apresenta a competição entre dois efeitos: blo¬queio Coulombiano e efeito Kondo. Nosso modelo considera gases eletrônicos unidi
Publicado em: 1999
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8. The single-channel properties of human acetylcholine α7 receptors are altered by fusing α7 to the green fluorescent protein
Neuronal nicotinic acetylcholine (AcCho) receptors composed of α7-subunits (α7-AcChoRs) are involved in many physiological activities. Nevertheless, very little is known about their single-channel characteristics. By using outside-out patch-clamp recordings from Xenopus oocytes expressing wild-type (wt) α7-AcChoRs, we identified two classes of channel con
The National Academy of Sciences.
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9. Multiple conductance classes of mouse nicotinic acetylcholine receptors expressed in Xenopus oocytes.
Acetylcholine receptor (AcChoR) subunit mRNAs transcribed from mouse BC3H-1 cDNAs were injected into Xenopus oocytes and the expressed AcChoR channels were examined by single channel recording. Injection of alpha-, beta-, gamma-, and delta-subunit mRNAs produced two predominant channel classes with conductances of approximately 50 and approximately 12 pS, wh
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10. Electrophysiological characterization of cloned m1 muscarinic receptors expressed in A9 L cells.
The electrophysiological properties of A9 L cells stably transfected with m1 muscarinic receptor cDNA were examined by using the whole-cell patch-clamp technique. In current-clamp recordings, acetylcholine (AcCho) elicited a hyperpolarization of all transfected cells studied but had no effect on nontransfected A9 L cells. In voltage-clamp recordings, AcCho e
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11. The potassium conductance of the resting squid axon and its blockage by clinical concentrations of general anaesthetics.
1. The effects of some neutral clinical and experimental general anaesthetics on the resting potential of normal squid axons and squid axons exposed to tetrodotoxin and 3,4-diaminopyridine have been studied. 2. Depolarizations of 1-4 mV were produced by all the anaesthetics at 'clinical' concentrations in the normal axon. Larger depolarizations (5-11 mV) wer
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12. The behavioral effects of phencyclidines may be due to their blockade of potassium channels.
The action of phencyclidine [1-(1-phenylcyclohexyl)piperidine; PCP] and its behaviorally active analog (m-amino-PCP) and of two behaviorally inactive analogs [m-nitro-PCP and 1-piperidinocyclohexanecarbonitrile (PCC)] were examined in this study. In a test of spatial alternation performance in rats, PCP and m-amino-PCP were much more potent behavior modifier