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Institute
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BACKGROUND: Acetogenic bacteria are able to use CO2 as terminal electron acceptor of an anaerobic respiration, thereby producing acetate with electrons coming from H2. Due to this feature, acetogens came into focus as platforms to produce biocommodities from waste gases such as H2+CO2 and/or CO. A prerequisite for metabolic engineering is a detailed understanding of the mechanisms of ATP synthesis and electron-transfer reactions to ensure redox homeostasis. Acetogenesis involves the reduction of CO2 to acetate via soluble enzymes and is coupled to energy conservation by a chemiosmotic mechanism. The membrane-bound module, acting as an ion pump, was of special interest for decades and recently, an Rnf complex was shown to couple electron flow from reduced ferredoxin to NAD+ with the export of Na+ in Acetobacterium woodii. However, not all acetogens have rnf genes in their genome. In order to gain further insights into energy conservation of non-Rnf-containing, thermophilic acetogens, we sequenced the genome of Thermoanaerobacter kivui.
RESULTS: The genome of Thermoanaerobacter kivui comprises 2.9 Mbp with a G+C content of 35% and 2,378 protein encoding orfs. Neither autotrophic growth nor acetate formation from H2+CO2 was dependent on Na+ and acetate formation was inhibited by a protonophore, indicating that H+ is used as coupling ion for primary bioenergetics. This is consistent with the finding that the c subunit of the F1FO ATP synthase does not have the conserved Na+ binding motif. A search for potential H+-translocating, membrane-bound protein complexes revealed genes potentially encoding two different proton-reducing, energy-conserving hydrogenases (Ech).
CONCLUSIONS: The thermophilic acetogen T. kivui does not use Na+ but H+ for chemiosmotic ATP synthesis. It does not contain cytochromes and the electrochemical proton gradient is most likely established by an energy-conserving hydrogenase (Ech). Its thermophilic nature and the efficient conversion of H2+CO2 make T. kivui an interesting acetogen to be used for the production of biocommodities in industrial micobiology. Furthermore, our experimental data as well as the increasing number of sequenced genomes of acetogenic bacteria supported the new classification of acetogens into two groups: Rnf- and Ech-containing acetogens.
Die Makrophytenvegetation eines stillgelegten Kanalabschnittes ("Alte Fahrt") bei Senden in Westfalen hat sich seit Beginn der 90er Jahre drastisch verändert. Aus einem typischen Potamogetonetum lucentis sind Reinbestände von Myriophyllum spicatum geworden, denen stellenweise Ceratophyllum demersum beigemischt ist. Die Ursachen für diese gravierenden Vegetationsveränderungen sind nicht klar. Da es sich um einen der bedeutendsten westfälischen Standorte des Potamogetonetum lucentis, einer in Nordrhein-Westfalen stark gefährdeten Pflanzengesellschaft, handelte, sind weiterführende Untersuchungen und Versuche zur Wiederansiedlung zu fordern.
Von 39 jungen Mauerseglern (Apus apus) verschiedenen Alters wird die Ontogenese morphologischer Parameter des Herzens sowie von Körperlänge und Brustmuskelmasse dargestellt. Die durchschnittliche Herzmasse erwachsener Segler liegt absolut bei rund 0,6–0,7 g. Das sind rund 1,6 % der mittleren Körpermasse und damit rund 40 % mehr als der mittlere Erwartungswert aller Vögel mit entsprechender Körpermasse. Die relative Herzmasse liegt beim Schlupf bei rund 2,7 %. Der Segler kommt mit einem relativ großen Herz auf die Welt, dessen Anteil an der Körpermasse bis zum Ausfliegen also um 41 % reduziert wird. Diese relative Reduktion findet man auch beim Herzvolumen: Es ändert sich absolut von rund 0,377 ml am Schlupftag auf 1,67 ml bei flüggen Mauerseglern; das massenbezogene Volumen nimmt so von rund 0,13 ml/g auf 0,04 ml/g ab. Die Herzbreite (Herzdurchmesser) beträgt über die gesamte Ontogenese konstant mehr oder weniger rund 60 % der Herzlänge. Die Körperlänge und die Masse des Brustmuskels zeigen eher eine (exponentielle) Sättigungskurve: Ab einer Körpermasse von 20-22 g (mittlere Adultwerte: 30,8–55,6 g; Mittelwert 40,5 g; n = 2570) zeigt die Körperlänge einen relativ konstanten Wert von rund 13-14 cm (mittlere Adultwerte: 16,5–18,5 cm); die Brustmasse ab einer Körpermasse von rund 30 g einen Wert von rund 2,0-2,5 g. Das sind rund 5-8 % der Körpermasse, wobei der relative Anteil im Verlauf der Ontogenese zunimmt (Anfangswert rund 2 %).