Phylum “Actinobacteria”, Class Actinobacteria, Order Bifidobacteriales, Family Bifidobacteriaceae, Genus Bifidobacterium,
Bifidobacterium merycicum Biavati and Mattarelli 1991.
Gram-positive irregular rods, 2-5 µm long, sometimes arranged in pairs which forms
angles. Non-motile. Non-spore-forming.
Colonies are smooth, convex, with entire margins, cream to white, soft and glistening.
Optimum growth temperature is 38-42 ºC. Optimum pH range is 6.5-6.9; not growing
at pH 4.5 and 8.0. Anaerobic.
Isolated from bovine rumen.
- Biavati B, Mattarelli P, 2012. Genus I. Bifidobacterium Orla-Jensen 1924. In: Parte et al. (ed). Bergey’s manual of systematic
bacteriology: The Actinobacteria, Part A and B. Springer, New York, 171-206.
- Biavati B, and Mattarelli P, 1971. Bifidobacterium ruminantium sp. nov. and Bifidobacterium merycicum sp. nov. from the rumens of
cattle. Int J Syst Bacteriol 41(1), 163-168.
Positive results for acid production from L-arabinose, dextrin, D-fructose (weakly), D-galactose, D-glucose, D-lactose, maltose,
melibiose, raffinose, D-ribose, starch, sucrose, and D-xylose.
Negative results for catalase, indole production, nitrate reduction, acid production from D- and L-fucose, gluconate, D-glucosamine,
D-glucuronate, glycerol, D-mannitol, D-mannose, melezitose, pectin, porcine gastric mucin, rhamnose, D-sorbitol, trehalose, and
Variable results for acid production from amylopectin, amylose, cellobiose, D-galactosamine, inulin (weakly), and salicin (weakly).
(c) Costin Stoica