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Bifidobacterium ruminantium sp. nov. and Bifidobacterium merycicum sp. nov. from the Rumens of Cattle

Istituto di Microbiologia Agraria, Università di Bologna, Bologna, Italy

^* Corresponding author.

ABSTRACT

Among several hundred bifidobacteria isolated from bovine rumens, eight strains were recognized primarily on the basis of DNA-DNA hybridization results as members of two new distinct DNA homology groups. We studied the morphology, oxygen, carbon dioxide, temperature, and pH requirements, fermentation patterns, end products of glucose fermentation, biochemical reactions, protein electrophoretic patterns, isozyme patterns, DNA homology relationships, and guanine-plus-cytosine contents of these organisms, and we propose that these two groups of strains should be considered new species, Bifidobacterium ruminantium (type strain, strain ATCC 49390) and Bifidobacterium merycicum (type strain, strain ATCC 49391).

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