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Am J Physiol Cell Physiol 252: C253-C262, 1987;
0363-6143/87 $5.00
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AJP - Cell Physiology, Vol 252, Issue 2 C253-C262, Copyright © 1987 by American Physiological Society

ARTICLES

High-speed ultrasensitive instrumentation for myofibril mechanics measurements

T. Iwazumi

A novel instrument for measuring the mechanics of a single myofibril is described. The principle of the transducer operation is to attach a myofibril to a very fine wire suspended in a magnetic field. Feedback circuits pass current through the wire to maintain the length constant when the myofibril contracts. The wire position is measured optoelectronically at a resolution below 1 A. The myofibril measurement system consists of two independent transducers and is capable of resolving tension down to 0.5 ng/square root Hz and controlling the myofibril length with a 10-microseconds rise time. Optical and electronic designs of the system and calibration and adjustment procedures are described. Experimental chamber design, a flow controller, and an environmental noise cancellation scheme are also discussed.


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