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Science 18 March 1988:
Vol. 239. no. 4846, pp. 1425 - 1427
DOI: 10.1126/science.239.4846.1425
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Articles
Anaerobic Dormancy Quantified in Artemia Embryos: A Calorimetric Test of the Control Mechanism
STEVEN C. HAND 1 and
ERICH GNAIGER 2
1 Department of Environmental, Population and Organismic Biology, Campus Box B-334, University of Colorado, Boulder, CO 80309.
2 Institut für Zoologie, Abteilung Zoophysiologie, Universität Innsbruck, A-6020 Innsbruck, Austria.
Continuous measurement of heat dissipation from brine shrimp embryos during reversible transitions from aerobic development to anaerobic dormancy demonstrates a primary role for intracellular pH(pHi)in this metabolic switching. Artificially elevating the depressed pHi during anoxia by adding ammonia markedly reactivates metabolism, as judged by increases in heat dissipation, trehalose catabolism, and the ratio of adenosine triphosphate to adenosine diphosphate. Energy flow during anaerobic dormancy is suppressed to 2.4 percent of aerobic values, which is the lowest percentage thus far reported for euryoxic animals. Use of diguanosine tetraphosphate stores cannot account for this observed heat dissipation. Thus, mobilizing trace amounts of trehalose may explain the energy metabolism during quiescence.
Submitted on November 9, 1987
Accepted on January 26, 1988
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