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8.Microbes in Human Welfare
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Vitamin $B_{12}$ is produced directly during the course of fermentation by
A
Ashbya gossypii
B
Rhizopus stolonifer
C
Saccharomyces cerevisiae
D
Propioni bacteria
Solution
(d)It has been demonstrated that Propionibacteria species has the highest potential to accumulate vitamin $B _{12}$ intracellularly. Propionibacterium shermanii and Propionibacterium freudenreichiiare most widely used. Propionibacteriaproduce vitamin $B _{12}$ intracellularly and excrete mainly propionic acid and acetic acid extracellularly.
All Propionibacterium strains employed for vitamin $B _{12}$ production are microaerophilic and produce vitamin $B _{12}$ in high yields only under very low oxygen concentrations.
Standard 12
Biology
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