Allgemeine Mikrobiologie - download pdf or read online


ISBN-10: 3134446081

ISBN-13: 9783134446081

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Den zur Synthese schwefelhaltiger Aminosäuren notwendigen Schwefelwasserstoff gewinnen die Pflanzen und Mikroorganismen durch assimilatorische Sulfatreduktion. Die Tiere sind auf die Aufnahme reduzierter Schwefelverbindungen mit der Nahrung angewiesen. Aus Fuchs, G. : Allgemeine Mikrobiologie (ISBN 978-313-444608-1) © Georg Thieme Verlag KG 2007 Dieses Dokument ist nur für den persönlichen Gebrauch bestimmt und darf in keiner Form an Dritte weitergegeben werden! 5 Mikroorganismen und ihre Fressfeinde Wegen ihrer Kleinheit stehen Mikroorganismen am Anfang der Nahrungskette.

Abb. 12 Protozoen, die als Bakterienräuber leben. a Eine Amöbe, die Bakterien umschlingt („Schlinger“). b ein sesshaftes Glockentierchen, das Bakterien mit Hilfe von Cilien einstrudelt („Strudler“, Aufnahme H. Cypionka, Oldenburg). 9 Die Entdeckung der Symbiose Bereits 1866, 9 Jahre nach Darwins epochemachendem Werk über die Entstehung der Arten, wurden die Flechten als Symbiose zwischen einem Schlauchpilz (Ascomyceten) und einer Grünalge oder – selten – einem Cyanobakterium erkannt. Damit wurde das erste Beispiel dafür gefunden, wie Kooperationen von Organismen im Kampf ums Dasein vorteilhaft sein können und ganz neue Lebensformen zustande bringen.

28 mM) in etwa 100fach höherer Konzentration vor als gelöster Sauerstoff. In Sedimenten entsteht die überwiegende Menge des in der Natur auftretenden Schwefelwasserstoffs im Zuge der dissimilatorischen Sulfatreduktion durch Desulfurikanten (sulfatreduzierende Bakterien). Dieser in anoxischen Sedimenten von Gewässern entstehende Schwefelwasserstoff kann durch anaerobe phototrophe Bakterien wieder zu Schwefel und Sulfat oxidiert werden. Gelangt der Schwefelwasserstoff in sauerstoffhaltige Zonen, so wird er entweder abiotisch oder durch aerobe Schwefelbakterien zu Sulfat oxidiert.

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Allgemeine Mikrobiologie

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