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Principles of minimizing metabolism and optimum conditions of species development


, : Principles of minimizing metabolism and optimum conditions of species development. Izvestiya Akademii Nauk Seriya Biologicheskaya (Moscow) 0(1): 8-15

In the region of optimum temperatures, the net oxygen consumption as calculated for the duration of definite stage of embryogenesis or for the increment of body weight unit of poikilothermic animals has a minimum significance. Within this temperatural range coinciding with spawning temperatures and maximum survival rate of embryos, the processes of embryogenesis and body weight growth take minimum amount of energy. Adaptation of energy metabolism to low temperatures is connected with an increased cytochrome concentration in fish skeletal muscles. In fish embryo (Salmo gairdneri, Coregonus autumnalis, Misgurnus fossilis, Brachidanio rerio), the lactate dehydrogenase Michaelis constants (K-m) for pyruvate have minimum values in the region of optimum temperatures for the development of one or other species. In the process of rainbow trout development which proceeds at variable ambient temperature, minimum K-m corresponding to maximum substrate and enzyme affinity is shifted from low temperatures (5-7 degree C) towards higher ones (12-13 degree C).

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