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The Journal of Cell Biology, Vol 78, 782-784, Copyright © 1978 by The Rockefeller University Press

ARTICLES

A new method for excitation-contraction uncoupling in frog skeletal muscle

J del Castillo and G Escalona de Motta

The mechanical activity of frog sartorius muscle fibers can be uncoupled from the electrical activity of their surface membranes by immersing the preparation in Ringer solution containing either 1.5 or 2.0 M of formamide for 15--20 min. This uncoupling is not reversed when the muscle is transferred to normal frog Ringer solution. Formamide does not affect the electrical activity of the sciatic nerve branch, and both endplate potentials and miniature endplate potentials may be recorded from the uncoupled muscles. Prolonged exposure to formamide, beyond the time needed to paralyze, causes neuromuscular block.
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