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By Rolf-Michael Wittich (auth.), Rolf-Michael Wittich (eds.)

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Appl Environ Microbiol 1993; 59:285-289. 83. Schmidt S, Fortnagel P, Wittich R-M. Biodegradation and transformation of 4,4'and 2,4-dihalodiphenyl ethers by Sphingomonas sp. strain SS33. Appl Environ Microbiol 1993; 59:3931-3933. 84. Blasco R, Wittich R-M , Mallavarapu M et aI. From xenobiotic to antibiotic, formation of protoanemonin from 4-chlorocatechol by enzymes of the 3-oxoadipate pathway. J BioI Chem 1995; 270:29229-29235. 85. Wilkes H, Wittich R-M, Timmis KN et al. Degradation of chlorinated dibenzofurans and dibenzo-p-dioxins by Sphingomonas sp.

Cathechol, resorcinol and 3,4-dihydroxybenzoate were used as model organic electron shuttles. The dechlorination pattern was different from that with vitamin BI2 and a rapid increase of the 2,3,7,8-/l,4,6,9-substituted hepta- and hexa-chlorinated dioxin isomers occurred. These results show that abiotic processes could play an important role in anaerobic environments. Possible Mechanisms of Reductive Dechlorination Only a limited number of anaerobic dehalogenating bacteria have been isolated, including chlorophenol, chlorobenzoate, chlorohydroquinone and chlorinated aliphatics dechlorinating strains.

Environ Sci Techno! 1972; 6:1017-1019. 28. Kearny PC, Woolson EA, Isensee AR et al. Tetrachlorodibenzodioxin in the environment: Sources, fate and decontamination. Environ Health Perspect 1973; 5:273277· 29. Matsumura F, Benezet HJ. Studies on the bioaccumulation and microbial degradation of 2,3,7,8-tetrachlorodibenzo-p-dioxin. Environ Health Perspect 1973; 5:253258. 30. Ward CT, Matsumura F. Fate of 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) in a model aquatic environment. Arch Environ Con tam Toxicol 1978; 7:349-357.

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