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Image #   271062C
Name:   Propionibacterium acidipropionici - Gram-positive, rod prokaryote
Copyright:   Copyright 2008 Dennis Kunkel Microscopy, Inc.
Description:   Caption: Propionibacterium acidipropionici - Gram-positive, anaerobic, non-spore forming, rod-shaped (bacillus) prokaryote. Inside silos crops ferment and substances produced in the fermentation process protects the silage from spoilage by yeasts and molds. This bacterium is often used as a bacterial inoculant to improve the aerobic stability of silage (such as grain, grass and legumes). Propionibacteria are unique in their ability to ferment erythritol (a natural sugar alcohol) or glucose to propionic acid and acetic acid. Some species of Propionibacteria are found in food products such as cheeses and other dairy products. P. freudenreichii is used in Swiss cheese manufacturing to produce its flavor and characteristic holes. The flavor derives from propionate (propionic acid), a product of the fermentation and the holes in Swiss cheese from bubbles of carbon dioxide. Proprionibacteria bacteria are found as saprophytes in humans, animals, dairy products and grain. Proprionibacteria are part of the normal flora of skin. P. acnes causes acne or acne vulgaris. Some Propionibacteria strains synthesize nitric oxide (NO) from nitrate reduction. Nitric oxide production is believed to be the mechanism by which some probiotics improve the mucosal barrier in mammals.
Magnification*: x3.400
Type: SEM
    *(Magnifications are based on a 35mm slide image of 24mm in the narrow dimension.)
Keywords:   02.01.08 271062C acetic acid ensiling silage propionate fermentation glucose fermentation food spoilage erythritol sugar alcohol grain storage grain silo grain fermentation acne acne vulgaris Propionibacterium freudenreichii Propionibacterium acidipropionici Propionibacterium acnes cheese manufacture cheese production cheese cheese making Swiss cheese Gram positive bacilli bacillus bacteria bacterium Gram-positive prokaryote rod SEM Propionibacterium Propionibacteria propionic acid rod-shaped rod shaped nitric oxide probiotic probiotics saprophytes flora human flora skin flora Corynebacteria Corynebacterium saprophyte corn silage grain silage grass silage legume silage anaerobe anaerobic heterofermative heterofermentation skin bacteria skin bacterium bacteria inoculant bacterial inoculant mold inhibition yeast inhibition

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