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Lactobacillus acidophilus image taken with a scanning electron microscope (SEM). A Lactobacillus acidophilus culture. Lactobacillus acidophilus is an immobile rod-shaped (bacillus), gram-positive organism that ranges in size from 2-10 μm in size.
Lactobacillus is a genus of gram-positive, aerotolerant anaerobes or microaerophilic, rod-shaped, non-spore-forming bacteria. [2] [3] Until 2020, the genus Lactobacillus comprised over 260 phylogenetically, ecologically, and metabolically diverse species; a taxonomic revision of the genus assigned lactobacilli to 25 genera (see § Taxonomy below).
The lactic acid bacteria (LAB) are either rod-shaped (), or spherical (), and are characterized by an increased tolerance to acidity (low pH range).This aspect helps LAB to outcompete other bacteria in a natural fermentation, as they can withstand the increased acidity from organic acid production (e.g., lactic acid).
Thiobacillus prosperus, T. acidophilus, T. organovorus, T. cuprinus Acetobacter aceti , a bacterium that produces acetic acid (vinegar) from the oxidation of ethanol. Alicyclobacillus , a genus of bacteria that can contaminate fruit juices.
ASF 360 was thought to be L. acidophilus. However, 16SrRNA results showed that it is closely related to but distinct from L. acidophilus. ASF 360 is a novel lactobacillus species; clustered with L. acidophilus and L. lactis. ASF 361 has nearly identical 16S rRNA sequences to L. murinus and L. animalis. Both species are routinely found in GI ...
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