Production and characterization of a biosurfactant from Cyberlindnera samutprakarnensis JP52(T.).

Cyberlindnera samutprakarnensis JP52(T), isolated from cosmetic industrial wastes in Thailand, was found to be an efficient biosurfactant-producing yeast when cultured in a medium containing (2% (w/v) glucose and 2% (v/v) palm oil at 30 °C, 200 rpm for 7 d. The crude biosurfactant had the ability to reduce the surface tension from 55.7 to 30.

Two new anamorphic yeasts species, Cyberlindnera samutprakarnensis sp. nov. and Candida thasaenensis sp. nov., isolated from industrial wastes in Thailand.

Three yeast strains were isolated from industrial wastes in Thailand. Based on the phylogenetic sequence analysis of the D1/D2 region of the large subunit rRNA gene, the internal transcribed spacer (ITS1-5.8S rRNA gene-ITS2; ITS1-2) region, and their physiological characteristics, the three strains were found to represent two novel species of the ascomycetous anamorphic yeast.

Glucose(xylose) isomerase production by Streptomyces sp. CH7 grown on agricultural residues.

Streptomyces sp. CH7 was found to efficiently produce glucose(xylose) isomerase when grown on either xylan or agricultural residues. This strain produced a glucose(xylose) isomerase activity of roughly 1.

Diversity and activity of PAH-degrading bacteria in the phyllosphere of ornamental plants.

Phyllosphere bacteria on ornamental plants were characterized based on their diversity and activity towards the removal of polycyclic aromatic hydrocarbons (PAHs), the major air pollutants in urban area. The amounts of PAH-degrading bacteria were about 1-10% of the total heterotrophic phyllosphere populations and consisted of diverse bacterial species such as Acinetobacter, Pseudomonas, Pseudoxanthomonas, Mycobacterium, and uncultured bacteria. Bacterial community structures analyzed by polymerase chain reaction-denaturing gradient gel electrophoresis from each plant species showed distinct band patterns.

Biosurfactant production by Pseudomonas aeruginosa A41 using palm oil as carbon source.

Biosurfactant production by Pseudomonas aeruginosa A41, a strain isolated from seawater in the gulf of Thailand, was examined when grown in defined medium containing 2% vegetable oil or fatty acid as a carbon source in the presence of vitamins, trace elements and 0.4% NH(4)NO(3), at pH 7 and 30 degrees C with 200 rpm-shaking for 7 days. The yield of biosurfactant steadily increased even after a stationary phase.

Novel intermediates of acenaphthylene degradation by Rhizobium sp. strain CU-A1: evidence for naphthalene-1,8-dicarboxylic acid metabolism.

The acenaphthylene-degrading bacterium Rhizobium sp. strain CU-A1 was isolated from petroleum-contaminated soil in Thailand. This strain was able to degrade 600 mg/liter acenaphthylene completely within three days.