Cultivation and in situ detection of a thermophilic bacterium capable of oxidizing propionate in syntrophic association with hydrogenotrophic methanogens in a thermophilic methanogenic granular sludge

Article Abstract:

Researchers have identified a bacterium in methanogenic granular sludge related to Desulfotomaculum that can oxidize propionate, ethanol, and lactate in coculture with Methanobacterium thermoautotrophicum. It ferments pyruvate in pure culture.

Bacteria, Thermophilic, Thermophilic bacteria, Sewage sludge

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Diversity, localization, and physiological properties of filamentous microbes belonging to Chloroflexi subphylum I in mesophilic and thermophilic methanogenic sludge granules

Article Abstract:

A polyphasic approach based on molecular methods and cultivation is used to elucidate the diversity, distribution, and roles of Chloroflexi subphylum I-type bacteria involved in upflow anaerobic sludge blanket sludge granules. The findings reveal that organisms affiliated with the bacterial taxon Chloroflexi subphylum I are ubiquitous microbial populations in mesophilic and thermophilic sludge granules.

Physiological aspects, Bacteria, Microorganisms, Methanobacteriaceae, Methanogens

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Non-sulfate-reducing, syntrophic bacteria affiliated with Desulfotomaculum cluster I are widely distributed in methanogenic environments

Article Abstract:

A study is conducted to analyze the distribution and abundance of Desulfotomaculum subcluster Ih bacteria in low-sulfate, methanogenic environments. The findings indicate that members of Desulfotomaculum subcluster Ih have adopted a syntrophic lifestyle to thrive in low-sulfate, methanogenic environments and thus have lost their ancestral ability for dissmilatory sulfate/sulfite reduction.

Analysis, Genetic aspects, Polymerase chain reaction, Ribosomal RNA, Gram-positive bacteria, Sulfates, Chemical properties

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