Summary
Forty-three isolates of Gram-negative, mesophilic, non-spore-forming anaerobic cellulolytic bacteria were obtained from (i) an anaerobic reactor treating waste water from an integrated paper mill and (ii) an anaerobic sewage-sludge digestor. These isolates were studied for carbohydrate fermentation and fermentation products. By numerical techniques, 22 isolates could be placed in two groups: group A (10 isolates) and group B (12 isolates). The isolates belonging to group A showed degradation of filter paper in 2–7 days. They were slightly-curved long rods and similar toBacteroides cellulosolvens andAcetivibrio cellulolyticus. Acetic acid was produced as major product. The bacteria also produced ethanol, isobutanol, pyruvic and lactic acids. Group B strains degraded filter paper in 4–5 weeks. They were short rods and produced propionic, lactic, succinic and acetic acids as fermentation products. The remaining 21 isolates could disintegrate filter paper in 2–5 weeks. They showed variable fermentation patterns, both as to fermentable carbohydrates and end products. Except for one isolate, which showed obvious similarity toButyrivibrio fibrisolvens, the isolate differed distinctly from reference strains of ruminai origin.
Résumé
43 souches de bactéries cellulolytiques Gram-négatives, mésophiles, non-sporulantes, et anaérobies ont été isolées à partir (A) d'un réacteur anaérobie traitant l'eau résiduaire d'une usine intégrale de pâte à papier et (B) de digesteurs anaérobies de boues d'égout. Ces souches ont été étudiées quant à leurs propriétés de fermenter les hydrates de carbone et quant à leurs produits de fermentation. Des techniques numériques ont permis de classer 22 de ces souches dans deux groupes: le groupe A (10 souches) et le groupe B (12 souches). Les souches appartenant au groupe A dégradaient le papier filtre en 2 à 7 jours. Elles se présentaient sous la forme de longs bâtonnets curvilignes et ressemblaient àBacteroides cellulosolvens et àAcetivibrio cellulolyticus. Le metabolite majeur était l'acide acétique. Elles produisaient aussi de l'éthanol, de l'iso-butanol, et des acides pyruvique et lactique. Les souches appartenant au groupe B dégradaient le papier filtre en 4 à 5 semaines. Elles se présentaient sous la forme de bâtonnets courts et produisaient, comme métabolites, les acides propionique, lactique, succinique et acétique. Les 21 souches restantes dégradaient le papier filtre en 2 à 5 semaines. Elles présentaient des profils de fermentation variables tant en ce qui concernait les hydrates de carbone fermentés que les produits finaux. A part une souche qui présentait une similitude évidente avecButyrivibrio fibrisolvens, ces souches différaient de façon marquée d'avec les souches de référence du rumen.
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Nitisinprasert, S., Temmes, A. & Gyllenberg, H.G. Characterization of anaerobic non-spore-forming bacteria in municipal sewage sludge and integrated paper-mill waste water. World J Microbiol Biotechnol 5, 67–76 (1989). https://doi.org/10.1007/BF01724961
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DOI: https://doi.org/10.1007/BF01724961