Article Abstract:
Researchers report the isolation of a strain of Enterobacter cloacae that can degrade parabens and is therefore resistant to them. Methylparaben and propylparaben are used in many foods, drugs, and cosmetics to preserve them, since they have antimicrobial activity against many bacteria.
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Article Abstract:
A study was conducted on the transformations of benzoic acid into 3-phenylpropionic acid (PPA) and phenylalanine. The consortium was found to be highly dependent on amino acids or proteose peptone as a nutrient for phenol cometabolism. A low incorporation of deuterium in phenylalanine with (5,6,7,8,92H)PPA was observed and attributed to the low speed at which the compound is used by the bacteria. Benzoic acid transformation into PPA could be an alternative to bacteria for phenylalanine synthesis when the medium becomes depleted with accessible sources of phenylalanine.
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Article Abstract:
Ten out of the twenty-three polycyclic aromatic hydrocarbon (PAH)-utilizing bacterial strains isolated from soils contaminated with petroleum wastes produce biosurfactants. The production of biosurfactants is analyzed by surface tension lowering and emulsifying properties of bacteria. Biosurfactants are produced by bacteria grown on soluble substrates such as mannitol and dextrose and PAHs such as naphthalene and phenanthrene. A study of a Pseudomonas aeruginosa strain indicates that cultures with mannitol rather than naphthalene promote faster production of biosurfactants.
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