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Myosin Birefringence and Adenylpyrophosphate

Abstract

OUR knowledge of the nature of muscular motion has hitherto been divided into two main fields of successful analysis. First there was the discovery of the phosphorylation cycles whereby energy is transferred from carbohydrate breakdown to the muscle fibre; here the earliest landmarks were the investigations of Fletcher and Hopkins1 and of Harden and Young2 (see the papers of Parnas3 and D. M. Needham4 for up-to-date reviews). Secondly, there was the discovery of the elongated or anisometric character of the particles of muscle-globulin (myosin), demonstrated in the classical paper of v. Muralt and Edsall5, leading to the application of X-ray techniques to the problem, and the establishment by Astbury6,7, that muscular contractility is essentially a molecular contractility of protein chains. The exact connexion between these two orders of fact, however, still remains obscure.

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NEEDHAM, J., SHEN, SC., NEEDHAM, D. et al. Myosin Birefringence and Adenylpyrophosphate. Nature 147, 766–768 (1941). https://doi.org/10.1038/147766a0

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