Anaerobic degradation of isobutyrate by methanogenic enrichment cultures and by a Desulfococcus multivorans strain

1989 ◽  
Vol 151 (2) ◽  
pp. 126-132 ◽  
Author(s):  
Marion Stieb ◽  
Bernhard Schink
Keyword(s):  
Anaerobic Degradation ◽  
Enrichment Cultures ◽  
Desulfococcus Multivorans

scholarly journals Anaerobic degradation of nonionic and anionic surfactants in enrichment cultures and fixed-bed reactors

1987 ◽  
Vol 21 (5) ◽  
pp. 615-622 ◽  
Author(s):  
Stefan Wagener ◽  
Bernhard Schink
Keyword(s):  
Anaerobic Degradation ◽  
Anionic Surfactants ◽  
Fixed Bed ◽  
Enrichment Cultures ◽  
Fixed Bed Reactors

Anaerobic Degradation of Acifluorfen by Different Enrichment Cultures

1994 ◽  
Vol 42 (5) ◽  
pp. 1232-1236 ◽  
Author(s):  
Mara Gennari ◽  
Michele Negre ◽  
Roberto Ambrosoli ◽  
Vincenza Andreoni ◽  
Macro Vincenti ◽  
...  
Keyword(s):  
Anaerobic Degradation ◽  
Enrichment Cultures

Anaerobic degradation of palm oil mill effluent (POME)

2011 ◽  
Vol 64 (10) ◽  
pp. 2001-2008 ◽  
Author(s):  
W. Yoochatchaval ◽  
S. Kumakura ◽  
D. Tanikawa ◽  
T. Yamaguchi ◽  
M. F. M. Yunus ◽  
...  
Keyword(s):  
Palm Oil ◽  
Anaerobic Degradation ◽  
Denaturing Gradient Gel Electrophoresis ◽  
Enrichment Culture ◽  
Palm Oil Mill Effluent ◽  
Enrichment Cultures ◽  
Degrading Bacteria ◽  
Thermophilic Conditions ◽  
Gradient Gel Electrophoresis ◽  
Palm Oil Mill

The biodegradation characteristics of palm oil mill effluent (POME) and the related microbial community were studied in both actual sequential anaerobic ponds in Malaysia and enrichment cultures. The significant degradation of the POME was observed in the second pond, in which the temperature was 35–37 °C. In this pond, biodegradation of major long chain fatty acids (LCFA), such as palmitic acid (C16:0) and oleic acid (C18:1), was also confirmed. The enrichment culture experiment was conducted with different feeding substrates, i.e. POME, C16:0 and C18:1, at 35 °C. Good recovery of methane indicated biodegradation of feeds in the POME and C16:0 enrichments. The methane production rate of the C18:1 enrichment was slower than other substrates and inhibition of methanogenesis was frequently observed. Denaturing gradient gel electrophoresis (DGGE) analyses indicated the existence of LCFA-degrading bacteria, such as the genus Syntrophus and Syntorophomonas, in all enrichment cultures operated at 35 °C. Anaerobic degradation of the POME under mesophilic conditions was stably processed as compared with thermophilic conditions.

Anaerobic degradation of 2-methylbenzoic acid by a methanogenic consortium

1993 ◽  
Vol 39 (8) ◽  
pp. 812-816 ◽  
Author(s):  
Kathleen L. Londry ◽  
Phillip M. Fedorak
Keyword(s):  
Molecular Weight ◽  
Sewage Sludge ◽  
Anaerobic Degradation ◽  
Trimethylsilyl Derivative ◽  
Acid Degradation ◽  
Enrichment Cultures ◽  
Acid Hydroxylation ◽  
Lag Times ◽  
Methanogenic Consortium

2-Methylbenzoic has been detected as a metabolite in anaerobic consortia that degrade m-cresol and it was found to accumulate in cultures incubated under methanogenic conditions. This study was initiated to determine whether 2-methylbenzoic acid could be degraded under methanogenic conditions. Near stoichiometric amounts of methane were obtained from 2-methylbenzoic acid in enrichment cultures inoculated with 25% (v/v) domestic anaerobic sewage sludge. However, lag times of 12–36 weeks typically were required before 2-methylbenzoic acid degradation began, and it was difficult to maintain the activity of the cultures. A transient metabolite was detected but not identified. It appeared to be the product of 2-methylbenzoic acid hydroxylation because its trimethylsilyl derivative had a molecular weight of 296, but it was not 4-hydroxy-2-methylbenzoic acid, the intermediate of m-cresol metabolism from which 2-methylbenzoic acid likely originates.Key words: anaerobic, methane, 2-methylbenzoic acid.

Anaerobic degradation of 2,4,5-trichlorophenoxyacetic acid by enrichment cultures from freshwater sediments

2019 ◽  
Vol 26 (33) ◽  
pp. 34459-34467
Author(s):  
Hassan Al-Fathi ◽  
Mandy Koch ◽  
Wilhelm G. Lorenz ◽  
Ute Lechner
Keyword(s):  
Anaerobic Degradation ◽  
Freshwater Sediments ◽  
Enrichment Cultures ◽  
Trichlorophenoxyacetic Acid

scholarly journals Anaerobic degradation of long-chain dicarboxylic acids by methanogenic enrichment cultures

1993 ◽  
Vol 111 (2-3) ◽  
pp. 177-182 ◽  
Author(s):  
C. Matthies ◽  
B. Schink
Keyword(s):  
Anaerobic Degradation ◽  
Dicarboxylic Acids ◽  
Enrichment Cultures ◽  
Long Chain

scholarly journals Anaerobic degradation of pristane in nitrate-reducing microcosms and enrichment cultures.

1997 ◽  
Vol 63 (5) ◽  
pp. 2077-2081 ◽  
Author(s):  
T P Bregnard ◽  
A Haner ◽  
P Hohener ◽  
J Zeyer
Keyword(s):  
Anaerobic Degradation ◽  
Enrichment Cultures

scholarly journals Anaerobic Degradation of Benzene, Toluene, Ethylbenzene, and o-Xylene in Sediment-Free Iron-Reducing Enrichment Cultures

2005 ◽  
Vol 71 (6) ◽  
pp. 3355-3358 ◽  
Author(s):  
Michael K. Jahn ◽  
Stefan B. Haderlein ◽  
Rainer U. Meckenstock
Keyword(s):  
Electron Acceptor ◽  
Ferric Oxide ◽  
Aromatic Compounds ◽  
Anaerobic Degradation ◽  
Disulfonic Acid ◽  
Free Iron ◽  
Enrichment Cultures ◽  
Benzene Toluene ◽  
Monoaromatic Hydrocarbons ◽  
Btex Compounds

ABSTRACT Monoaromatic hydrocarbons such as benzene, toluene, ethylbenzene, and xylene (BTEX) are widespread contaminants in groundwater. We examined the anaerobic degradation of BTEX compounds with amorphous ferric oxide as electron acceptor. Successful enrichment cultures were obtained for all BTEX substrates both in the presence and absence of AQDS (9,10-anthraquinone-2,6-disulfonic acid). The electron balances showed a complete anaerobic oxidation of the aromatic compounds to CO2. This is the first report on the anaerobic degradation of o-xylene and ethylbenzene in sediment-free iron-reducing enrichment cultures.

scholarly journals Microbial Anaerobic Demethylation and Dechlorination of Chlorinated Hydroquinone Metabolites Synthesized by Basidiomycete Fungi

2004 ◽  
Vol 70 (1) ◽  
pp. 385-392 ◽  
Author(s):  
C. E. Milliken ◽  
G. P. Meier ◽  
J. E. M. Watts ◽  
K. R. Sowers ◽  
H. D. May
Keyword(s):  
Forest Soil ◽  
Anaerobic Degradation ◽  
First Report ◽  
Enrichment Cultures ◽  
Reductive Degradation ◽  
Soils And Sediments ◽  
Desulfitobacterium Hafniense ◽  
Synthesis And Degradation ◽  
Basidiomycete Fungi

ABSTRACT The synthesis and degradation of anthropogenic and natural organohalides are the basis of a global halogen cycle. Chlorinated hydroquinone metabolites (CHMs) synthesized by basidiomycete fungi and present in wetland and forest soil are constituents of that cycle. Anaerobic dehalogenating bacteria coexist with basidiomycete fungi in soils and sediments, but little is known about the fate of these halogenated fungal compounds. In sediment microcosms, the CHMs 2,3,5,6-tetrachloro-1,4-dimethoxybenzene and 2,3,5,6-tetrachloro-4-methoxyphenol (TCMP) were anaerobically demethylated to tetrachlorohydroquinone (TCHQ). Subsequently, TCHQ was converted to trichlorohydroquinone and 2,5-dichlorohydroquinone (2,5-DCHQ) in freshwater and estuarine enrichment cultures. Screening of several dehalogenating bacteria revealed that Desulfitobacterium hafniense strains DCB2 and PCP1, Desulfitobacterium chlororespirans strain Co23, and Desulfitobacterium dehalogenans JW/DU1 sequentially dechlorinate TCMP to 2,3,5-trichloro-4-methoxyphenol and 3,5-dichloro-4-methoxyphenol (3,5-DCMP). After a lag, these strains demethylate 3,5-DCMP to 2,6-DCHQ, which is then completely dechlorinated to 1,4-dihydroquinone (HQ). 2,5-DCHQ accumulated as an intermediate during the dechlorination of TCHQ to HQ by the TCMP-degrading desulfitobacteria. HQ accumulation following TCMP or TCHQ dechlorination was transient and became undetectable after 14 days, which suggests mineralization of the fungal compounds. This is the first report on the anaerobic degradation of fungal CHMs, and it establishes a fundamental role for microbial reductive degradation of natural organochlorides in the global halogen cycle.

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