The time in Göttingen is characterized by experiments, among others, to find inhibitors of photosynthetic electron transport in chloroplasts, which can be used to gain insights into the role of the components, especially plastoquinone, involved in electron transport and phosphorylation. In cooperation with other scientists, you analyzed herbicides of the benzimidazole, carbamate,

and NVP-AUY922 manufacturer 1,2,4-triazinone type as well as antibodies against chloroplasts, among them with Karl-Heinz Büchel, Wilfried Draber and Carl Fedtke from the Bayer Company, with whom you had a close cooperation for nearly 30 years. But it was first with 2,5-dibromo-3-methyl-6-isopropyl-p-benzoquinone (DBMIB) that you in 1970, then

already in Bochum, found a new inhibitor that proved to be a specific plastoquinone antagonist, which allowed far-reaching mechanistic conclusions. In your laboratory in Bochum, it became possible to analyze in detail the electron transport Alpelisib clinical trial between photosystems II and I and the components involved using DBMIB and other specific inhibitors of photosynthesis. Experiments with quinoid, lipid-soluble and H-carrying electron donors led to the concept of “artificial energy conservation” which contributed significantly to the understanding of chemiosmotic energy conservation. Your laboratory was able to make important contributions especially to the structure of the protein involved in the herbicide binding pocket. Your work in 1986 on the topology of the plastoquinone- and herbicide-binding D1 proteins in

photosystem II and your report in 1984 on the sequence homology of cytochrome b in bc 1 complexes from mitochondria and of cytochrome b in the b 6 f complex of chloroplasts are among your most-often cited publications. In 1990, you found that the herbicide-binding D1 protein is degraded by UV irradiation of chloroplasts in an oxygen-dependent reaction, and later, in 2002, you showed that singlet oxygen plays an important role in this reaction––a role that still today stimulates you to do further experiments. In your department in Bochum, you always had group members who were allowed to pursue their own research direction after initial experiments Fossariinae with you, and who––after completion of their habilitation––became professors either in Bochum or at another German university. These were Peter Böger (Konstanz), Richard Berzborn (Bochum), Erich Elstner (Munich), Günther Hauska (Regensburg), Hermann Bothe (Köln), Günther F. Wildner (Bochum), Wolfgang Haehnel (Freiburg), Walter Oettmeier (Bochum), Jens-Dirk Schwenn (Bochum) and Udo Johanningmeier (Halle). You always generously supported all these former group members and let them work independently. Your encouragement and constructive criticism gave them the courage to forge ahead on their own. This was not restricted to the ten “Habilitanden” mentioned above.