Abstract
1. 1. The bulk of a 14C-labelled l-alanine solution (20 μM) is removed by shipworms in vivo within 24 hr, primarily via the mantle and gills. 2. 2. Uptake of l-alanine and glycine by excised mantle occurs against a concentration gradient and is inhibited by metabolic inhibitors. 3. 3. Two saturable transport processes exist for glycine in mantle tissue; one sodium-dependent, which has a K t of 8.0 μM, and a V max of 0.8 nmols/mg dry wt/10 min, the other sodium-independent with a K t of 10.86 μM and V max of 0.32 nmols/mg dry wt/10 min. Glycine uptake is inhibited by neutral and basic amino acids, but not by the acidic amino acid l-aspartate; inhibition by l-alanine appears to be partially competitive. 4. 4. The dipeptide, l-alanyl- l-alanine is removed from seawater by sipworms in vivo.
Published Version
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