Results 261 to 270 of about 241,722 (301)
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Intracellular divalent cations and neuronal excitability
Canadian Journal of Physiology and Pharmacology, 1979Intracellular injections of Mg into cat spinal motoneurones have a depolarizing action, associated with a fall in input conductance, and depression of the postspike hyperpolarizing after-potential (a.h.p.) as well as its underlying conductance increase. There is also an increase in excitability, sometimes leading to outright discharge, and a change in
K, Krnjević +5 more
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Tropomyosin Paracrystals Formed by Divalent Cations
Science, 1966Rabbit tropomyosin exhibits a polymorphism dependent on divalent cations and p H. Above a critical divalent cation concentration fibers with a period of about 400 angstroms are formed. Below this concentration, and near the isoelectric point, lattices are formed.
C, Cohen, W, Longley
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Tightly-bound divalent cation of actin
Journal of Muscle Research and Cell Motility, 1992Actin is known to undergo reversible monomer-polymer transitions that coincide with various cell activities such as cell shape changes, locomotion, endocytosis and exocytosis. This dynamic state of actin filament self-assembly and disassembly is thought to be regulated by the properties of the monomeric actin molecule and in vivo by the influence of ...
J E, Estes +3 more
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Divalent cations induce protofibril gelation
American Journal of Hematology, 1988AbstractSoluble fibrin oligomers (protofibrils) undergo phase change merely by adding 1–2 mM Ca2+ 25‐100 μM Zn2+. The cation‐induced “protofibrin” clots appear similar to normally formed fibrin gels. Maximal clot turbidity of protofibrin gels increases with cations in a concentration‐dependent manner.
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O-Carboxymethylagar: interaction with divalent cations
Carbohydrate Polymers, 1994Abstract O -Carboxymethylagar was produced from a commercial, low methoxylated agar sample. The degree of substitution of the sample was 1·2 carboxymethyl groups per disaccharide repeating unit. The procedure used for the synthesis lowered the polymer molecular weight slightly.
Bosco M., GAMINI, AMELIA, RIZZO, ROBERTO
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Interaction of divalent cations, quinolones and bacteria
Journal of Antimicrobial Chemotherapy, 1994The interaction between divalent cations and quinolones and the mechanism by which the former antagonizes the antimicrobial activities of the latter were investigated. In the presence of either magnesium or calcium chloride, the MICs of 18 quinolones for Gram-positive and Gram-negative bacteria increased. Accumulation of and inhibition of DNA synthesis
A J, Marshall, L J, Piddock
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The effect of divalent cations on cell adhesion
Journal of Periodontal Research, 1969The effect of several divalent cations on cell adhesion was estimated in monolayer cell cultures. The exclusion of the divalent cations (Ca and Mg) from Hanks' balanced salt solution resulted in rapid cell detachment from the glass substratum. Detached cells would reattach when these divalent cations again were introduced into the medium.Other divalent
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An Overview of Divalent Cation and Citrate Handling by the Kidney
Nephron Physiology, 2004Urinary calcium, magnesium and citrate levels are important in promoting or inhibiting renal stone formation. Here we review current information on the tubular handling of these ions. Most filtered calcium is reabsorbed in the proximal tubule and the thick ascending limb (TAL) of the loop of Henle, largely paracellularly; most of the remainder is ...
Unwin R. +2 more
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The role of divalent cations in potassium channels
Trends in Neurosciences, 1988Abstract The most heterogeneous of the ion channel proteins may be those selective for potassium ions. This broad class of channels includes, among many others, voltage dependent potassium channels important for repolarizing nerve and muscle action potentials (so-called delayed rectifier K channels).
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Divalent cation dopants for polyparaphenylene
Synthetic Metals, 1993Abstract Free-standing films of polyparaphenylene (PPP) were synthesized from the electrochemical oxidation of benzene. A potential of about 4.7 V was applied across the counter and working electrodes in a nitrobenzene solution containing lithium hexafluoroarsenate and copper (II) chloride as electrolytes.
E.-W. Chang, R.J. Kuk, R.B. Kaner
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