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The aim of the present work was to compare the microbial communities of a mesophilic and a thermophilic pilot scale anaerobe sludge digester. For studying the communities cultivation independent chemotaxonomical methods (RQ and PLFA analyses) and T-RFLP were applied. Microbial communities of the mesophilic and thermophilic pilot digesters showed considerable differences, both concerning the species present, and their abundance. A Methanosarcina sp. dominated the thermophilic, while a Methanosaeta sp. the mesophilic digester among Archaea. Species diversity of Bacteria was reduced in the thermophilic digester. Based on the quinone patterns in both digesters the dominance of sulphate reducing respiratory bacteria could be detected. The PLFA profiles of the digester communities were similar though in minor components characteristic differences were shown. Level of branched chain fatty acids is slightly lower in the thermophilic digester that reports less Gram positive bacteria. The relative ratio of fatty acids characteristic to Enterobacteriaceae, Bacteroidetes and Clostridia shows differences between the two digesters: their importance generally decreased under thermophilic conditions. The sulphate reducer marker (15:1 and 17:1) fatty acids are present in low quantity in both digesters.

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Acta Microbiologica et Immunologica Hungarica
Meysam Hasannejad-Bibalan
Ali Mojtahedi
Morteza Eshaghi
Mahdi Rohani
Mohammad Reza Pourshafie
, and
Malihe Talebi

J Immunopharmacol . 2015 ; 28 : 1034 – 1043 . 10.1016/j.intimp.2015.08.019 14. Macfarlane S , Furrie E , Cummings JH , Macfarlane GT . Chemotaxonomic analysis of bacterial populations colonizing the rectal mucosa in patients with

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–2009 . Cannabinoids 2010 , 5 , 1 – 21 . 19. Hillig , K. W. ; Mahlberg , P. G. A chemotaxonomic analysis of cannabinoid variation in cannabis (cannabaceae) . Am. J. Bot 2004 , 91 , 966 – 975 . 10.3732/ajb.91.6.966 20. Hillig , K. W. A chemotaxonomic

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