Isolation and characterization of two new homoacetogenic hydrogen-utilizing bacteria from the human intestinal tract that are closely related to Clostridium coccoides

Article Abstract:

Two homogenic bacterial strains such as strain 1410 and 3110 were isolated from the human intestinal tract. Analysis of the enrichment cultures of the human gut homoacetogenic bacteria indicated the inability of the microbes to grow in methanol due to the absence of a methanol-specific methyltransferase for the degradation of methanol. However, the gram-positive, anoxic strains were able to grow on vanillate due to their ability to metabolize methyl groups.

Microbiological synthesis, Microbiology, Taxonomy (Biology)

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Bioconversion of cellulose to acetate with pure cultures of Ruminococcus albus and a hydrogen-using acetogen

Article Abstract:

The coculture of Ruminococcus albus and a hydrogen-using acetogen (a gram-negative coccobacillus) can fermentate cellulose yielding acetate. Interspecies hydrogen is a key factor responsible for acetate production. Both batch culture and continuous culture produce acetate though batch culture yields higher concentrations of acetate. Increase of hydrogen partial pressure over the culture is a limiting factor.

Observations, Fermentation, Hydrogen, Acetates, Bacteriology, Bacterial cultures

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Formate-dependent growth and homoacetogenic fermentation by a bacterium from human feces: description of Bryantella formatexigens gen. nov., sp. nov.

Article Abstract:

Research identifies a distinct bacterial species within the Clostridium coccoides whose growth is stimulated by formate. At high formate concentrations it ferments glucose to acetate and vegetable cellulose and carboxymethylcellulose. It is detected in human feces and named as Bryantella formatexigens gen. nov., sp. nov.

United Kingdom, United States, Food and nutrition, Microbial metabolism, Bacterial growth

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