High-speed ultrasensitive instrumentation for myofibril mechanics measurements

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...

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Bibliographic Details
Published inThe American journal of physiology Vol. 252; no. 2 Pt 1; p. C253
Main Author Iwazumi, T
Format Journal Article
LanguageEnglish
Published United States 01.02.1987
Subjects
Biomechanical Phenomena
Calibration
Magnetics
Muscle Contraction
Myofibrils - physiology
Optics and Photonics
Sarcomeres - physiology
Solutions
Specimen Handling
Transducers
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Summary: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.
ISSN:0002-9513
DOI:10.1152/ajpcell.1987.252.2.C253