Abstract
1. 1. Rubidium transport and inorganic osmolyte permeabilities were studied in isolated, perfused Carcinus gills, 2. 2. The gill permeability coefficient calculated from the unidirectional ion fluxes in the perfused gills in diluted sea water identical to the bath showed more cation than anion selectivity, showing the following permeability ratios P Rb: P Na: P Cl = 1.7:1.0:0.2. 3. 3. Net Rb secretive fluxes ( J b→a from the haemolymph across the basolateral and apical membrane surfaces into the bathing solution were inhibited (51%) by basolaterally applied ouabain (5 × 10 −3M). 4. 4. The results suggest the presence of ouabain-sensitive active Rb secretion where the mechanisms are basolaterally located. Net rubidium fluxes were not changed by externally applied 10 −4M amiloride.
Published Version
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