title: [Arginine, octopine and alanine during the tonic and phasic contraction of the anterior byssus retractor muscle of Mytilus edulis].
abstract: In this work, we compare the energetic cost of tonic and phasic contractions of the anterior byssus retractor muscle (ABRM) of Mytilus edulis. The muscle is stimulated by six different stimulation methods and frozen when it reaches its maximal isometric response. Tonic and phasic tension developments are of similar amplitude and cause a hydrolysis of the same amount of phosphoarginine corresponding to 0.64 mumole per g of muscle and per kg/cm2 of tension (Fig. 1). As compared with the results reported in the literature the values are in good agreement with the biochemical and respiratory measurements, but they are 10 times higher than those measured by the heat production. The total arginine, octopine and alanine contents of those muscles frozen at the peak of contraction are not significantly different from those measured on the resting muscle. On the other hand, these metabolites may show seasonal variations.
mesh_terms: D000409:Alanine / Q000378:metabolism*; D000818:Animals; D001120:Arginine / Q000031:analogs & derivatives* / Q000378:metabolism*; D049872:Bivalvia / Q000502:physiology*; D004734:Energy Metabolism; D009119:Muscle Contraction; D009130:Muscle, Smooth
chemical_list: C005394:octopine; D001120:Arginine; D000409:Alanine
vernacular_title: Arginine, octopine et alanine durant la contraction tonique et phasique du muscle rétracteur antérieur du byssus (ABRM) de Mytilus edulis.