Successions of bacterial community in composting cow dung wastes with or without hyperthermophilic pre-treatment |
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Authors: | Takeshi Yamada Atsushi Suzuki Hideyo Ueda Yasuichi Ueda Keisuke Miyauchi Ginro Endo |
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Institution: | (1) Faculty of Engineering, Tohoku Gakuin University, Tagajo, Miyagi 985-8537, Japan;(2) Institute of Hyperthermophiles, Japan Life Center Co., Nakizin, Okinawa 905-0212, Japan |
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Abstract: | Comparative analyses of bacterial community successions in the composting materials were done for a conventional windrow post-treatment
(WPOT) process with the hyperthermophilic pre-treatment (HTPRT) and simple windrow composting (SWC; without the HTPRT). Multidimensional
scaling profiles based on data of terminal restriction fragment length polymorphisms of the bacterial population in the samples
of every 7 days composting material and analyses of the 16S rRNA gene-based clone library of the 7 and 21 days composting
materials suggested that bacterial communities of the composting materials differed much between these two processes until
the 35 days of composting, whereas that they were closely related to each other at the final composting stage (42 days of
composting). Detailed phylogenetic analysis clarified that all WPOT clone libraries contained many clones of the lineages
of aerobic bacteria (for example, bacilli). However, the most abundant clones retrieved from all SWC materials were affiliated
with a clone cluster closely related to identified and classified members of the phylum Firmicutes that have strictly anaerobic metabolism pathways. From these results, we conclude that the HTPRT process contributed to easily
establish an aerobic ecosystem from the early stage to the final stage of WPOT composting with plowing the materials only
once a week. |
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Keywords: | Composting Cow dung waste Hyperthermophilic pre-treatment Terminal restriction fragment length polymorphisms Multidimensional scaling analysis 16S rRNA gene-based clone library |
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