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Citation for published version (APA): Iwaarden, P. R. V., Driessen, A.

In the presence of electrochemhical energy, several branched-chain neutral and acidic amino acids were found to accumulate in membrane vesicles of Bacillus stearothermophilus. The membrane vesicles contained a stereo-specific transport system for the acidic amino acids L-glutamate and L-aspartate, which could not translocate their respective amines, L-glutamihe and L-asparagine. The transport system was thermostable (T1 = 700C) and showed highest activities at elevated temperatures (60 to 65°C). The

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