Frieder Schauer

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We characterized the ability of a yeast to cleave the aromatic structure of the dioxin-like compound dibenzofuran. The yeast strain was isolated from a dioxin-contaminated soil sample and identified as Trichosporon mucoides. During incubation of glucose-pregrown cells with dibenzofuran, six major metabolites were detected by high-performance liquid(More)
Cells of the gram-negative bacterium Ralstonia sp. strain SBUG 290 grown in the presence of biphenyl are able to cooxidize dibenzofuran which has been 1,2-hydroxylated. Meta cleavage of the 1, 2-dihydroxydibenzofuran between carbon atoms 1 and 9b produced 2-hydroxy-4-(3'-oxo-3'H-benzofuran-2'-yliden)but-2-enoic acid, which was degraded completely via(More)
By varying selected environmental factors, the degradation and mineralization of biaryl compounds by the bacterium Ralstonia pickettii in soil and compost were investigated. An optimized soil moisture and enhanced bioavailability by using the nonionic surfactant Tween 80 were of great importance for the degradation rates of biaryl compounds like biphenyl(More)
The genomic structure of an industrial yeast strain Trichosporon spec. LS3 was compared with Trichosporon adeninovorans type strain CBS 8244. The cot values, the portion of single copy sequences (CBS 8244: 10.9 x 10(9) D, LS3: 10.6 x 10(9) D) as well as of repetitive sequences (CBS 8244: 6.0 x 10(9) D, LS3: 5.5 x 10(9) D) per haploid genome and genome(More)
We investigated the ability of Trametes versicolor and Pycnoporous cinnabarinus to metabolize triclosan. T. versicolor produced three metabolites, 2-O-(2,4,4'-trichlorodiphenyl ether)-beta-D-xylopyranoside, 2-O-(2,4,4'-trichlorodiphenyl ether)-beta-D-glucopyranoside, and 2,4-dichlorophenol. P. cinnabarinus converted triclosan to 2,4,(More)
Unprotected l-phenylalanine was derivatized by an innovative enzymatic method by means of laccases from Pycnoporus cinnabarinus and Myceliophthora thermophila. During the incubation of l-phenylalanine with para-hydroquinones using laccase as biocatalyst, one or two main products were formed. Dependent on the substitution grade of the hydroquinones mono- and(More)
The effect of different solvents and pollutants on the cellular fatty acid composition of three bacterial strains: Thauera aromatica, Geobacter sulfurreducens and Desulfococcus multivorans, representatives of diverse predominant anaerobic metabolisms was investigated. As the prevailing adaptive mechanism in cells of T. aromatica and G. sulfurreducens whose(More)
Laccase is a ligninolytic enzyme widely distributed in wood-rotting fungi and which is also found in a variety of molds and insects as well as some plants and bacteria. Its biological roles range from depolmerization of lignin, coal and humic acids via the oxidation of various mono- and diaromatic structures, to polymerization reactions and pigment(More)
Laccase, a ligninolytic enzyme, was secreted by each ofthe white rot fungi Trametes versicolor and Pycnoporus cinnabarinusduring growth in a nitrogen-rich medium under agitated conditions. Afteraddition of 2-hydroxydibenzofuran to cell-freesupernatants of the cultures, yellow precipitates wereformed. These precipitates were poorly soluble in waterand(More)
Trichosporon beigelii SBUG 752 was able to transform diphenyl ether. By TLC, HPLC, GC, GC-MS, NMR- and UV-spectroscopy, several oxidation products were identified. The primary attack was initiated by a monooxygenation step, resulting in the formation of 4-hydroxydiphenyl ether, 2-hydroxydiphenyl ether and 3-hydroxydiphenyl ether (48:47:5). Further oxidation(More)