...Louis F. Gainey, Jr SUMMARY Pieces of gill isolated from the clam Mercenaria mercenaria clear colloidal graphite from seawater, and the clearance rates are measurable. 5-Hydroxytryptamine (5-HT) had a biphasic effect on clearance rates:concentrations from 10 –6 to 10 –5 mol l –1 5-HT increased...

... acid (FAA) in P. expansa . The contribution of alanine to the TFAA pool in various tissues increased from 43–48% in brackish water to 62–73% in seawater. In contrast, in clams exposed to air for 17 days there were no changes in alanine content in any of the tissues studied. Thus, the functional role...

...Louis F. Gainey, Jr; Michael J. Greenberg SUMMARY The physiology and timing of gill muscle potentiation were explored in the clam Mercenaria mercenaria . When isolated demibranchs were exposed twice (with an intervening wash) to the same concentration of 5-hydroxytryptamine, the second contraction...

...Raymond W. Lee; James J. Childress; Nicole T. Desaulniers ABSTRACT The nutrition of the gutless clam Solemya reidi is supported by the activity of intracellular chemoautotrophic bacteria housed in its gill filaments. Ammonia (the sum of NH 3 and NH 4 + ) is utilized as a nitrogen source...

... symbiosis nitrate respiration chemoautotrophy clam Lucinoma aequizonata The marine bivalve Lucinoma aequizonata is one of a recently discovered group of marine invertebrates which form an association with chemoautotrophic bacteria ( Cavanaugh, 1985 ; Fisher, 1990 ). These types of animals...

... of Biologists 1993 mollusc clam Mercenariamercenaria ventricle autorhythmicity cardiac action potential systolic force Rhythmicity of bivalve hearts is directly regulated by inhibitory and excitatory neural inputs ( Hill and Welsh, 1966 ; Jones, 1983 ). Prosser (1940) deduced...