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The opportunistic human pathogen Acinetobacter baumannii is one of the leading causes of nosocomial infections. The high prevalence of multidrug‐resistant strains, a high adaptability to changing environments and an overall pronounced stress resistance contribute to persistence and spread of the bacteria in hospitals and thereby promote repeated outbreaks. Altogether, the success of A. baumannii is mainly built on adaptation and stress resistance mechanisms, rather than relying on ‘true’ virulence factors. One of the stress factors that pathogens must cope with is osmolarity, which can differ between the external environment and different body parts of the human host. A. baumannii ATCC 19606T accumulates the compatible solutes glutamate, mannitol and trehalose in response to high salinities. In this work, it was found that most of the solutes vanish immediately after reaching stationary phase, a very unusual phenomenon. While glutamate can be metabolized, mannitol produced by MtlD is excreted to the medium in high amounts. First results indicate that A. baumannii ATCC 19606T undergoes a rapid switch to a dormant state (viable but non‐culturable) after disappearance of the compatible solutes. Resuscitation from this state could easily be achieved in PBS or fresh medium.
Die Niederungen der Artlandbäche (Landkreis Osnabrück, Niedersachsen) wurden 2001 auf die Vorkommen von Gefäßpflanzen der „Roten Liste“ untersucht. Alle Vorkommen wurden parzellenscharf erfaßt, einem Biotoptyp zugeordnet und die Artmächtigkeit halbquantitativ geschätzt. Insgesamt gelangen 575 Funde von 52 Sippen der Roten Liste einschließlich Anhang. Hiervon gelten lediglich 5 als stark gefährdet, die übrigen als gefährdet oder möglicherweise gefährdet. Sieben weitere Sippen sind im Untersuchungsgebiet seit 1982 verschollen. Die aktuellen Vorkommen konzentrieren sich auf die Oberläufe der Artlandbächemit ihren Auen und Bruchwäldern sowie Quellsümpfen. Hier wachsen zahlreiche Sippen in großen Populationen (zum Beispiel Caltha palustris, Carex echinata, Valeriana dioica, Viola palustris). Nassgrünländer sind dagegen stark zurückgegangen und überwiegend nur noch fragmentarisch ausgebildet, das Floreninventar ist hier stark verarmt. Weite Bereiche an den Unterläufen der Artlandbäche weisen aufgrund intensiver landwirtschaftlicher Nutzung nur noch wenige Vorkommen gefährdeter Gefäßpflanzen auf.