R. L. Amann, L. W. Schleifer, and K. H. , Phylogenetic identification and in situ detection of individual microbial cells without cultivation, Microbiol. Rev, vol.59, 1995.

J. Brosius, T. J. Dull, D. D. Sleeter, and H. F. Noller, Gene organisation and primary structure of a ribosomal RNA operon from Escherichia coli, J. Mol. Biol, vol.148, 1981.

P. Buffière, R. Moletta, and C. Fonade, Continuous operations of fluidized bed bioreactor for anaerobic digestion : residence time effect on degradation kinetics, Biotechnol. Lett, vol.17, pp.833-838, 1995.

J. Godon, E. Zumstein, P. Dabert, F. Habouzit, and R. Moletta, Microbial SSU rDNA diversity in an anaerobic digestor, Appl. Environ. Microbiol, vol.63, pp.2802-2813, 1997.

T. H. Jukes, C. R. Cantor, B. L. Maidak, N. Larsen, M. J. Mccaughey et al., Evolution of protein molecules, Nucleic Acids Res, vol.22, pp.3485-3487, 1969.

C. L. Moyer, F. C. Dobbs, and D. M. Karl, Estimation of diversity and community structure through restriction fragment length polymorphism distribution analysis of bacterial 16S rRNA genes from a microbial mat at an active hydrothermal vent system, Appl. Environ. Microbiol, vol.60, pp.871-879, 1994.

S. Mylvaganam and P. Dennis, Sequence heterogeneity between the two genes encoding 16S rRNA from the halophilic archaebacterium Haloarcula marismortui, Genetics, vol.130, pp.399-410, 1992.

L. Raskin, L. R. Poulsen, D. R. Noguera, B. E. Rittmann, and D. A. Stahl, Quantification of methanogenic groups in anaerobic biological reactors by oligonucleotide probe hybridisation, Appl. Environ. Microbiol, vol.60, pp.1241-1248, 1994.

N. Saitou and M. Nei, The neighbor-joining method : a new method for constructing phylogenetic trees, Mol. Biol. Evol, vol.4, pp.406-425, 1987.

J. Sambrook, E. F. Fritsch, and T. Maniatis, Molecular cloning : A laboratory manual, 1989.