Abstract

1. 1. The removal of myosin from flbrillar flight muscle fibre of the waterbug Lethocerus resulted in a great drop in the tension produced by passive stretch, while a considerable amount of tension developed in similarly treated flight muscle fibres of the locust. 2. 2. Connectin, which functions as a parallel elastic component of muscle, was obtained from both the waterbug and locust muscles. The content in the waterbug was less than in the locust and they both contained connectin in amounts less than vertebrate skeletal muscle. 3. 3. The role of connectin in the passive elasticity of insect flight muscles is discussed in relation to the function of connecting material which links myosin filaments to Z-lines. 4. 4. An unusually high content of phenylalanine was observed in SDS†-insoluble proteins from insect flight muscle.

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