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Citation link: http://nbn-resolving.de/urn:nbn:de:gbv:46-00105127-15
00105127-1.pdf
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Ecophysiology and genomics of key sulfate-reducing bacteria involved in anaerobic hydrocarbon degradation at marine gas and oil seeps


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Other Titles: Ökophysiologie und Genomik der am anaeroben Kohlenwasserstoffabbau beteiligten sulfatreduzierenden Mikroben in marinen Gas- und Ölquellen.
Authors: Stagars, Marion Helen  
Supervisor: Knittel, Katrin
1. Expert: Amann, Rudolf  
2. Expert: Musat, Florin 
Abstract: 
The diversity, function and community structure of anaerobic hydrocarbon-degrading microorganisms in marine environments were elucidated by methods in molecular ecology, microbiology and microbial genomics. A high diversity of n-alkane degraders was revealed in globally distributed marine seep sediments based on genes encoding (1-methylalkyl)succinate synthase (MasD), the functional marker for anaerobic n-alkane degradation. Both abundant cosmopolitan and specialized variants of MasD were detected as well as novel lineages of n-alkane degraders. It could be shown that the community structure is clearly driven by the available hydrocarbon substrate. Further, the response of the microbial community in Caspian Sea sediments to simulated crude oil seepage using a Sediment-Oil-Flow-Through system was investigated. Sulfate reduction and methanogenesis were important processes in the anaerobic degradation of hydrocarbons during crude oil seepage in these sediments. After oil-flow-through, several groups of SRB exhibited an increase in cell numbers and are likely responsible for the observed decrease in aliphatic hydrocarbon concentration.
Keywords: anaerobic hydrocarbon degradation, marine seep sediments, microbial diversity, alkyl succinate synthase, geneFISH, single cell genomics
Issue Date: 8-Dec-2015
Type: Dissertation
URN: urn:nbn:de:gbv:46-00105127-15
Institution: Universität Bremen 
Faculty: FB2 Biologie/Chemie 
Appears in Collections:Dissertationen

  

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