- 1.
A time course of the changes in blood Ca2+ and freezing tolerance of Modiolus demissus (Dillwyn) demonstrated that increases in freezing tolerance parallel increases in blood Ca2+. The increases in freezing tolerance occurred rapidly, suggesting that Ca2+ affects freezing tolerance directly by its presence in the blood.
- 2.
The presence of La3+ reduced the freezing tolerance of isolated foot muscle. Thus, Ca2+ appears to increase freezing tolerance directly by binding to cell membranes.
- 3.
The loss of the contractile response of freeze-thawed foot muscle to Ach, KCl and caffeine and the continued response to CaCl2 suggested that cell membranes are the primary sites of freezing injury.
- 4.
The increase in blood Ca2+ following low-temperature acclimation accounted for only 40% of the total change in freezing tolerance. Therefore, other mechanisms responsible for increasing the freezing tolerance of M. demissus following low temperature acclimation also exist.
JOURNAL ARTICLE|
01 August 1977
A Calcium-Dependent Mechanism Responsible for Increasing the Freezing Tolerance of the Bivalve Mollusc Modiolus Demissus
DENNIS J. MURPHY
DENNIS J. MURPHY
1 Department of Zoology, University of Maryland, College Park, Maryland 20742; Department of Zoology, Connecticut College, New London, Connecticut 06320
Search for other works by this author on:
DENNIS J. MURPHY
1 Department of Zoology, University of Maryland, College Park, Maryland 20742; Department of Zoology, Connecticut College, New London, Connecticut 06320
Revision Received:
27 Jul 1977
Online ISSN: 1477-9145
Print ISSN: 0022-0949
© 1977 by Company of Biologists
1977
J Exp Biol (1977) 69 (1): 13–21.
Article history
Revision Received:
27 Jul 1977
Citation
DENNIS J. MURPHY; A Calcium-Dependent Mechanism Responsible for Increasing the Freezing Tolerance of the Bivalve Mollusc Modiolus Demissus. J Exp Biol 1 August 1977; 69 (1): 13–21. doi: https://doi.org/10.1242/jeb.69.1.13
Download citation file:
