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- W49805114 abstract "Bacterial cellulose can be synthesized by Acetobacter xylinum. It is a very pure cellulose, not mixed with other components as hemicelluloses or lignocelluloses. Bacterial cellulose is organized as a fibrous network. In this paper firstly the kinetics of growth and cellulose formation are described. According to increasing initial concentrations of glucose within a range of 5 to 30 g/l the rates of product formation increase and the yields at lower concentrations are optimal. With respect to the very low amounts of cell dry mass (0.4 g/l) the consumption of total nitrogen is negligable but amino acids such as tryptophane, methionine, lysine, phenylalanine and threonine are essential. The paper is introduced by an overview about structure and biochemistry of bacterial cellulose. Acetobacter xylinum ist in der Lage Cellulose extrazellulär zu akkumulieren. Diese liegt in sehr reiner Form vor, sie wird nicht von anderen Polymeren, wie Hemicellulosen, Lignocellulosen o. a. begleitet. Die Cellulose baut ein fibrilläres Netzwerk auf, das die Bakterien einschließt. In der vorliegenden Arbeit wird der Verlauf von Wachstum und Cellulosebildung beschrieben. Mit zunehmender Initialglucosekonzentration (5 bis 30 g/l) nehmen die Produktbildungsraten zu, die Wachstumsraten dagegen bleiben weitgehend unbeeinflußt. Die besten Ausbeuten werden bei niedrigen Glucosekonzentrationen (10 g/l) erzielt. Im Hinblick auf die sehr geringe Trockenzellmasse (0,4 g/l) ist der Stickstoffverbrauch mengenmäßig zu vernachlässigen; einige Aminosäuren (Tryptophan, Methionin, Lysin, Phenylalanin, Threonin) sind jedoch essentiell. Der Arbeit ist eine Übersicht über den Erkenntnisstand bezüglich Struktur und Biochemie bakterieller Cellulose vorangestellt." @default.
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- W49805114 date "1989-01-01" @default.
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- W49805114 title "Gewinnung und Anwendung von Bakteriencellulose" @default.
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- W49805114 doi "https://doi.org/10.1016/s0232-4393(89)80037-x" @default.
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