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Osmotic regulation in hydra: Sodium and calcium localization and source of electrical potential
Author(s) -
Macklin Martin
Publication year - 1967
Publication title -
journal of cellular physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.529
H-Index - 174
eISSN - 1097-4652
pISSN - 0021-9541
DOI - 10.1002/jcp.1040700209
Subject(s) - lernaean hydra , sodium , calcium , biophysics , frog skin , biology , potassium , microbiology and biotechnology , chemistry , organic chemistry
Abstract Ca 45 and Na 22 radioautographs using freeze‐substitution with 2‐ethoxyethanol have been prepared for hydra. They reveal a heavy accumulation of Ca and Na along the mesoglea. Microelectrode probes indicate that the positive resting potential in the hydra gut may be resolved into a series of three steps. These results in hydra epithelium suggest that hydra concentrate ions across the outer epidermal cell layer in much the same way that Na is transported across frog skin.