Blocking Probability
Mostrando 13-24 de 52 artigos, teses e dissertações.
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13. Esquemas de proteção e conversão de comprimento de onda em redes opticas WDM / Protection schemes and wavelength conversion in WDM optical networks
This work examines the blocking reduction with the use of wavelength converters and some protection schemes in optical networks. Sub-Graph Routing Protection, a protection method that creates different failure-dependent protection paths for each connection is presented. Some schemes were proposed and compared, aiming at eliminating unnecessary connection rea
Publicado em: 2005
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14. cellular networks; Mobile networks / Controle de admissÃo de chamas e reserva de recursos em redes mÃveis celulares
Handoff in wireless/mobile networks is the mechanism that transfers an ongoing call from the current cell as the mobile station moves through the coverage area of the system. User applications may experience performance degradation due to handoffs from user mobility. If the target cell does not have sufficient available bandwidth, the call will be dropped. F
Publicado em: 2004
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15. Quinine blockade of currents through Ca2+-activated K+ channels in bovine chromaffin cells.
1. The blocking action of quinine of Ca2+-activated K+ channels was studied in excised inside-out patch recordings from cultured bovine chromaffin cells. Under normal ionic conditions (160 mM-K+ inside, 154 mM-Na+ outside), the unitary conductances measured between -20 and +40 mV were between 95 and 210 pS. 2. Quinine applied on the intracellular side of the
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16. Anion blockers inhibit impulse-evoked quantal transmitter release at the crayfish neuromuscular junction
1. The effects of the anion-transport blocking reagents Probenecid, 4,4′diisothiocyanostilbene-2,2′-disulphonate (DIDS), and pyridoxal phosphate on the number of quanta released (m) and the time course of the probability of quantal release, α(t), following an action potential were studied at single synaptic sites on the opener muscle in the crayfish leg
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17. Internal Aluminum Block of Plant Inward K+ Channels
Aluminum (Al) inhibits inward K+ channels (Kin) in both root hair and guard cells, which accounts for at least part of the Al toxicity in plants. To understand the mechanism of Al-induced Kin inhibition, we performed patch clamp analyses on Kin in guard cells and on KAT1 channels expressed in Xenopus oocytes. Our results show that Al inhibits plant Kin by bl
American Society of Plant Physiologists.
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18. The voltage-dependent block of ATP-sensitive potassium channels of frog skeletal muscle by caesium and barium ions.
1. Patch clamp techniques were used to study the action of external Cs+ and Ba2+ on adenosine 5'-triphosphate (ATP)-dependent K+ channels in sarcolemmal vesicles from frog skeletal muscle. Both ions block channels in a voltage-dependent fashion, block increasing with hyperpolarization. 2. The Cs+ block is flickery, mean unitary current being reduced and open
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19. Regulation of ultraviolet light-induced gene expression by gene size
UV light induces the expression of a wide variety of genes. At present, it is unclear how cells sense the extent of DNA damage and alter the expression of UV-induced genes appropriately. UV light induces DNA damage that blocks transcription, and the probability that a gene sustains transcription-blocking DNA damage is proportional to locus size and dose of U
National Academy of Sciences.
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20. Long-term potentiation and dual-component quantal signaling in the dentate gyrus
Long-term potentiation (LTP) of excitatory transmission is an important candidate cellular mechanism for the storage of memories in the mammalian brain. The subcellular phenomena that underlie the persistent increase in synaptic strength, however, are incompletely understood. A potentially powerful method to detect a presynaptic increase in glutamate release
The National Academy of Sciences.
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21. The actions of suxamethonium (succinyldicholine) as an agonist and channel blocker at the nicotinic receptor of frog muscle.
1. Patch clamp methods were used to study the equilibrium and kinetic properties of the acetylcholine analogue, succinyldicholine (suxamethonium), which is used clinically as a neuromuscular blocking agent. 2. The equilibrium concentration-response curve, corrected for desensitization was estimated by measuring as the response the probability of being open o
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22. Mechanism of memantine block of NMDA-activated channels in rat retinal ganglion cells: uncompetitive antagonism.
1. N-methyl-D-aspartic acid (NMDA)-activated currents were recorded from dissociated rat retinal ganglion cells using whole-cell recording. The NMDA open-channel blocking drug memantine was evaluated for non-competitive and/or uncompetitive components of antagonism. A rapid superfusion system was used to apply various drugs for kinetic analysis. 2. Dose-resp
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23. Quinine blocks specific gap junction channel subtypes
We demonstrate that the antimalarial drug quinine specifically reduces currents through gap junctions formed by some connexins (Cx) in transfected mammalian cells, but does not affect other gap junction types. Quinine blocked Cx36 and Cx50 junctional currents in a reversible and concentration-dependent manner with half maximal blocking concentrations of 32 a
The National Academy of Sciences.
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24. Properties of the block of single Na+ channels in guinea-pig ventricular myocytes by the local anaesthetic penticainide.
1. The blocking mechanism of a disopyramide derivative Penticainide (2-alkyl-(4-(dialkylamino)-2-)pyridyl-butyramide) on cardiac Na+ channels has been studied using single-channel analysis in cell-attached and inside-out patches from guinea-pig ventricular cells. Penticainide was applied in concentrations between 3 and 100 microM. The S-enantiomer of DPI 201