Sodium influx in isolated gills of the freshwater mussel,Ligumia subrostrata |
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Authors: | Thomas H Dietz and S Y Graves |
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Institution: | (1) Department of Zoology and Physiology, Louisiana State University, 70803 Baton Rouge, Louisiana, USA |
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Abstract: | Summary Isolated gills of the freshwater mussel,Ligumia subrostrata, accumulate Na from a pondwater bathing medium. The rate of Na transport by the isolated gill is 13.2±1.1 mol (g dry gill·10 min)–1 which equals or exceeds the estimated Na transport rate of intact animals. Sodium influx is saturable with aV
max of 13.6±1.2 mol (g dry gill·10 min)–1 and an affinity (K
s) of 0.17 mM Na/l. The isolated gills survive prolonged exposure to pondwater with a constant
of 890 l O2 (g dry gill·h)–1 over a 4 h period. Sodium transport in the isolated gills is stimulated 80% above control values by 10–4 M serotonin, 60% by 0.5 mM cAMP and 60% by 12.5 g/ml nystatin. Sodium influx is inhibited by 0.5 mM amiloride and 1 mM lithium. |
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