Histologie und Phylogenie der Leitbündel von Primula Sect. Auricula

Ohne Zusammenfassung     

Zur Waldgeschichte Schlesiens (Vorläufige Mitteilung)

Ohne ZusammenfassungMit 9 Textabbildungen.     

Alternative Modifikationen bei Schmetterlingen

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Phänomene visueller anpassung. I. Bis III. Mitteilung

Ohne ZusammenfassungMit Unterstützung der Notgemeinschaft der Deutschen Wissenschaft und der Freiburzer wissenschaftlichen Gesellschaft.     

Anatomische Beobachtungen an Zerealienfrüchten

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Redox reactions of hydrogen selenide ion

Hydrogen selenide ion (HSe^-) is an important product in the metabolism of the essential trace element selenium. Although its role in selenium metabolism is recognized, aspects of the basic chemistry of selenide have been ignored, particularly the tendency of selenide to undergo rapid redox reactions with biological oxidants. Using polarography, we have found that selenide reacts in vitro with a variety of compounds including dehydroascorbic acid, quinones like vitamin K₁ and FAD (flavin adenine dinucleotide), and disulfides such as oxidized glutathione and lipoic acid. The fact selenide reacts readily in vitro suggests similar reactions may also occur in vivo with important biological consequences. Contrary to expectations, selenide was found not to reduce the disulfide bond of oxidized dithiothreitol (trans-4,5-dihydroxyl-1,2-dithiane), indicating the commonly published value for the standard electrode potential of the selenium/hydrogen selenide ion couple is in error. The electrode potential is an important parameter to aid in anticipating possible redox reactions of selenide in vivo.