Abstract

1. 1. Specific GDP-binding in brown adipose tissue (BAT) mitochondria is increased by 50% in Djungarian hamsters after 70 days of exposure to a short photoperiod at 23°C ambient temperature; total GDP-binding in BAT is elevated by 300%. GDP-binding remains unchanged during exposure to a long photoperiod. 2. 2. The increase of GDP-binding in response to a short day is less than 30% if compared to the increase induced by additional cold influence (outdoor/winter). 3. 3. GDP-binding in BAT, as a measure of the thermogenic capacity in BAT, is correlated to the NST capacity of the animals and the significance of BAT during NST is discussed.

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