Abstract
AbstractThe unidirectional influx of14C‐L‐alanine into the external integument surface of Glycera dibranchiata was measured in the presence and absence of sodium using lucite influx chambers which permitted brief exposures of only the external surface of the body wall to isotope. The influx of alanine was the sum of a mediated component obligatorily dependent on sodium in the external medium, and a nonsaturable sodium‐independent diffusion component. The mediated component was inhibitable by other amino acids, lacked transconcentration effects, and had a Q10 of 9.64 near the acclimation temperature of 12°C. The diffusion component was not competitively inhibitable and had a Q10 of 0.99 at 12°C. The saturable component had a Kt = 8.63 × 10−5 M and Jmax = 1.38 × 10−7 mol/hr · cm2. The Kt falls within the physiological range of free amino acid concentrations to which the worm would be exposed in its habitat.
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