Premium
The absence of electrically demonstrable polarizing factors in Hydra
Author(s) -
Macklin Martin
Publication year - 1971
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.1040770110
Subject(s) - lernaean hydra , polarity (international relations) , regeneration (biology) , biology , isoelectric point , microbiology and biotechnology , anatomy , biophysics , cell , biochemistry , enzyme
Abstract Various investigators have shown that in the marine hydroids, Tubularia, Obelia, Eudendrium , and Pennaria , regeneration and polarity is affected by an electrical field applied parallel to the regenerate. Using electrical currents up to the physiological limits for Hydra , no relation between electrical current and regeneration rate or polarity could be demonstrated. This is in spite of the fact that adult Hydra are normally electrically polarized with the distal end approximately–18 mV relative to the proximal end of the animal. When the electrophoretic mobility and isoelectric point of cells from distal, central and proximal thirds of Hydra were measured, a significant difference was found between cells of the two cell layers but not between cells of the three body thirds. These results are discussed in relation to Hydra growth factors described by various other authors.