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• W2017485645 abstract "Myosin form birefringence has been studied in cryostat sections of left ventricular myocardium from the dog and human. The muscle in such sections has been shown to demonstrate the sliding filament phenomenon. The sarcomere length of canine myocardium agreed with that found in comparable electron micrographs. Unexpectedly, it was found that glycerol, normally used as an inert and optically ideal mountant, caused profound change in myosin birefringence. This apparently invalidates results obtained with this mountant. The absolute birefringence found in these sections, whether mounted in glycerol or in an ATP-calcium buffer, corresponded to values found by other workers with skeletal muscle and isolated myosin. However, the birefringent properties (optical path difference: o.p.d.) of well functioning muscle was found to be low, the o.p.d. increasing when exposed to ATP and calcium. Poorly functioning muscle could be distinguished from well functioning muscle on the basis of its higher 'in air' o.p.d. This difference correlated well with physiological assessments of myocardial function or with clinical assessments of cardiac failure. Evidence is presented indicating that changes in apparent birefringence, caused by ATP-calcium or by anoxia, are due to altered orientation of the myosin micelles and can be inhibited by agents that inhibit myosin ATPase activity." @default.
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• W2017485645 date "1985-04-01" @default.
• W2017485645 modified "2023-09-27" @default.
• W2017485645 title "Increased myosin orientation during muscle contraction: A measure of cardiac contractility" @default.
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• W2017485645 doi "https://doi.org/10.1002/cbf.290030205" @default.
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• W2017485645 hasPublicationYear "1985" @default.
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