Download e-book for iPad: Biosurfactants: From Genes to Applications by Gloria Soberón-Chávez

By Gloria Soberón-Chávez

ISBN-10: 3642144896

ISBN-13: 9783642144899

ISBN-10: 364214490X

ISBN-13: 9783642144905

Biosurfactants, tensio-active compounds produced through residing cells, at the moment are gaining expanding curiosity because of their capability functions in lots of assorted commercial components during which thus far virtually completely man made surfactants were used. Their certain buildings and features are only growing liked. additionally, biosurfactants are thought of to be environmentally “friendly,” rather non-toxic and biodegradable. This Microbiology Monographs quantity bargains with the newest advances within the box of microbial biosurfactants, comparable to rhamnolipids, serrawettins, trehalolipids, mannosylerythritol lipids, sophorolipids, surfactin and different lipopeptides. every one bankruptcy stories the features of a person biosurfactant together with the physicochemical houses, the chemical constructions, the function within the body structure of the manufacturing microbes, the biosynthetic pathways, the genetic rules, and the capability biotechnological applications.

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2). For P. aeruginosa, a model of FAS II was proposed that is composed of the same enzymatic machinery (Hoang and Schweizer 1999). However, the fabH homolog in P. aeruginosa has been only tentatively identified. It is therefore only hypothesized that initiation of FAS II is mediated by KAS III (FabH), and subsequently, initiation of elongation cycles are catalyzed by KAS I (FabB) for saturated fatty acid substrates and KAS II (FabF) for unsaturated fatty acid substrates (Hoang and Schweizer 1999).

2008). Guerra-Santos et al. showed that for P. 5, glucose, nitrate) C/N ratios between 16/1 and 18/1 lead to the highest RL productivity while no RLs could be observed at C/N ratios lower than 11/1 (Guerra-Santos et al. 1984, 1986). Apart from phosphorus and nitrogen limitations, restricted availability of multivalent ions like Mg, Ca, K, Na and trace element salts also often result in increased RL yields. 3, sunflower oil) were observed in calcium-free media (Giani et al. 1997). Abalos et al. (2002) identified the carbon source, the nitrogen source, the phosphate content, and the iron content as critical factors for the medium when producing RLs with P.

On the other hand, high levels of NH4+ or glutamine reduce the production of RLs, and this is correlated with a lower glutamine synthase activity (Mulligan and Gibbs 1989). Synthesis of this enzyme, which is upregulated by environmental signals such as nitrogen-limiting conditions, is controlled by the RpoN s factor (s54) (Totten et al. 1990). In addition to the major housekeeping s factor, s70, many bacteria have alternative s factors that direct the expression of particular subsets of genes (Potvin et al.

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Biosurfactants: From Genes to Applications by Gloria Soberón-Chávez


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