Use of metallochromic dyes to measure changes in myoplasmic calcium during activity in frog skeletal muscle fibres

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1. Changes in transmission of quasi-monochromatic light were measured in singly dissected, dye-injected twitch fibres following a single propagated action potential. The records, after correction for the intrinsic transmission signal, indicate changes in dye-related absorbance, ΔA. This paper describes the different components of dye-related signals in fibres injected with either Arsenazo III, Antipyrylazo III or Dichlorophosphonazo III.

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