期刊
BIORESOURCE TECHNOLOGY
卷 131, 期 -, 页码 281-287出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2013.01.003
关键词
Caulobacter; Cellulolytic; Facultative; Fermentation; Sediments
资金
- National Natural Science Foundation of China [51079139, 40971279]
- Innovation Program of the Chinese Academy of Sciences [KZCX2-EW-314]
Caulobacteria are presumed to be responsible for considerable mineralization of organic material in aquatic environments. In this study, a facultative, mesophilic and cellulolytic bacterium Caulobacter sp. FMC1 was isolated from sediments which were taken from a shallow freshwater lake and then enriched with amendment of submerged macrophyte for three months. This strain seemed to evolve a capacity to adapt redox-fluctuating environments, and could degrade cellulose both aerobically and anaerobically. Cellulose degradation percentages under aerobic and anaerobic conditions were approximately 27% and 10% after a 240-h incubation in liquid mediums containing 0.5% cellulose, respectively. Either cellulose or cellobiose alone was able to induce activities of endoglucanase, exoglucanase, and beta-1,4-glucosidase. Interestingly, ethanol was produced as the main fermentative product under anaerobic incubation on cellulose. These results could improve our understanding about cellulose-degrading process in aquatic environments, and were also useful in optimizing cellulose bioconversion process for bioethanol production. (C) 2013 Elsevier Ltd. All rights reserved.
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