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Bifidobacteria
Last reviewed: 23.04.2024
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Bifidobacteria are gram-positive non-spore-forming immobile sticks. Pleomorphic, diphtheria or clavate with one rounded end and another cone-shaped, staining less intensively. Cells can be coccoid, elongated, bifurcate and even branched; are arranged singly, in pairs, in the form of letters V and Y in short chains or groups in the form of Chinese characters. A typical species is Propionibacterium.
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Cultural properties of bifidobacteria
Most strains of bacteria grow most rapidly under anaerobic conditions, on special media, with an optimum pH of 7.0 at 25-45 ° C.
[8], [9], [10], [11], [12], [13]
Biochemical activity of bifidobacteria
Bifidobacteria have a fermentable metabolism. Fermentation products include combinations of propionic and acetic acids. Most strains form ammonia from protein substances.
Ecological niche of bifidobacteria
Human skin, digestive tract of humans and animals: found in dairy products.
[19], [20], [21], [22], [23], [24],
Sensitivity to antimicrobial agents
Bifidobacteria are sensitive to the effects of commonly used antiseptics and disinfectants.