Nonselective Pulses
Mostrando 1-8 de 8 artigos, teses e dissertações.
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1. Quantum state tomography in 3 q-bits systems: a tool of nuclear magnetic resonance for applications on quantum computing / Tomografia de estados quânticos em sistemas de 3 q-bits: uma ferramenta da ressonância magnética nuclear para aplicações em computação quântica
Este trabalho consiste na análise de um método de reconstrução/tomografia de estado quântico em ressonância magnética nuclear utilizando pulsos de radiofreqüência não-seletivos, que possuem a propriedade de promover rotações globais do sistema de spins 7/2. Tal método foi aplicado para reconstruir estados relacionados à computação quântica.
Publicado em: 2008
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2. Correlation of unstable multidrug cross resistance in Chinese hamster ovary cells with a homogeneously staining region on chromosome 1.
An enrichment selection method using repeated pulses of low drug concentration (1 microgram/ml) was used to isolate CHO (AK412) variants that are 20-fold more resistant to cytochalasin D (CD). CD-resistant (CydR) variants possess a unique unstable phenotype, including a longer doubling time in nonselective medium, a higher frequency of multinucleate cells in
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3. Effects of neurotensin on rat supraoptic nucleus neurones in vitro.
1. The electrophysiological actions of neurotensin on magnocellular neurosecretory cells (MNCs) were examined during intracellular recording from seventy-three supraoptic nucleus neurones in superfused explants of rat hypothalamus. 2. Application of neurotensin tridecapeptide (NT(1-13); 1 nM to 3 microM) caused a membrane depolarization and reversibly attenu
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4. Calcium-dependent inward current in Aplysia bursting pace-maker neurones.
Depolarizing voltage-clamp pulses elicit a triphasic series of tail currents (phase I, II and III) in Aplysia burst-firing neurones L2-L6. The sequence and time course of the tail currents resemble slow changes in membrane potential which follow bursts in the unclamped cell. The phase II tail current is an inward current with a time course similar to that of
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5. Intracellular calcium ions modulate acetylcholine-induced inward current in guinea-pig ileum.
1. The modulatory effect of internal Ca2+ on the current through the ACh-activated non-selective cation channels (Ins, ACh) was investigated by the whole-cell patch clamp technique in single isolated cells of guinea-pig ileum. 2. Ins, ACh was isolated with caesium aspartate internal solution of low Ca2(+)-buffering capacity (10 microM-EGTA). With preceding d
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6. Long-term potentiation at nicotinic synapses in the rat superior cervical ganglion.
1. Nicotinic fast excitatory postsynaptic potentials (fast EPSPs) were recorded intracellularly from postganglionic neurones in the isolated rat superior cervical ganglion. 2. An hours-long potentiation of the fast EPSP could be induced by brief tetanic stimulation of the preganglionic nerve (5 Hz for 5 s to 20 Hz for 20 s). While long-term potentiation (LTP
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7. Enhancement of Ih, but not inhibition of IM, is a key mechanism underlying the PACAP-induced increase in excitability of guinea pig intrinsic cardiac neurons
Pituitary adenylate cyclase-activating polypeptide (PACAP) increases excitability of guinea pig cardiac neurons, an effect mediated by PACAP-selective PAC1 receptors. In dissociated guinea pig cardiac neurons, PACAP causes a positive shift of the voltage dependence of activation of the hyperpolarization-activated nonselective cation current (Ih). This observ
American Physiological Society.
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8. Mechanisms of oscillatory activity in guinea-pig nucleus reticularis thalami in vitro: a mammalian pacemaker.
1. The ionic mechanisms of rhythmic burst firing and single spike, tonic discharge were investigated with extracellular and intracellular recordings of single neurones in the guinea-pig nucleus reticularis thalami (NRT) maintained as a slice in vitro. 2. Activation of cortical/thalamic afferents to NRT neurones resulted in a short latency burst of action pot