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- W1972303127 abstract "In single fibers of frog toe muscles placed in a Cl- free MOPS solution containing 1.8 mM Ca2+, tension developed slowly in the presence of very low concentrations of Ag+. This tension was not blocked by the administration of Co2+ or Ni2+. On the other hand, two types of transient tensions developed with the application of 5 microM Ag+, in fibers pretreated with 0-Ca2+ MOPS solution, containing either 2 mM Co2+ or 1mM Ni2+, for 10 min. In the presence of divalent cations or TTX, the first repetitive twitch-like contraction disappeared, indicating this tension is induced by action potentials repeatedly generated by the lack of divalent cations. The 2nd subsequent transient tension was caused by 5 microM Ag+ in the presence of various kinds of divalent cations, or TTX. After reversion to the resting tension, the fiber was contracted by adding more than 0.1 mM of Ca2+ or 25 mM caffeine to the external medium. Even when placed in a Ca2+-free solution containing 3 mM EGTA and 3 mM Mg2+ for 30 min, the fiber still developed an appreciable tension in response to 5 microM Ag+. These findings suggest that a transient development of the Ag+-induced tension does not require the presence of external Ca2+. A specific sulfhydryl reagent, pCMPS, did not contract the muscle fiber. Therefore, Ag+ may develop tension by mediating unknown chemical reaction(s) other than the sulfhydryl group on T-tubular membrane proteins." @default.
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- W1972303127 date "1985-01-01" @default.
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- W1972303127 title "Tension development in frog skeletal muscle induced by silver ions." @default.
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- W1972303127 doi "https://doi.org/10.2170/jjphysiol.35.841" @default.
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