Above images source – microbewiki.kenyon.edu
The Lactobacillus bacterium, stained blue here, colonizes the human gut when people eat yogurt. A new study details how L. rahmnosus, a single-organism probiotic, helps the gut microbiome flourish.
Microbiome Restoration Editors note –
While it may seem that certain bacteria may not produce any exotic or powerful compounds that the body uses directly, it now appears that certain probiotic bacteria act as “traffic cops” or regulators of the other bacteria. It is likely that these are as important as the bacteria that directly produce helpful compounds.
Lactobacillus, also called Döderlein’s bacillus, is a genus of Gram-positive facultative anaerobic or microaerophilic rod-shaped bacteria. They are a major part of the lactic acid bacteria group, named as such because most of its members convert lactose and other sugars to lactic acid. In humans they are present in the vagina and the gastrointestinal tract, where they make up a small portion of the gut flora. They are usually benign, except in the mouth where they have been associated with cavities and tooth decay (dental caries). Many species are prominent in decaying plant material. The production of lactic acid makes its environment acidic, which inhibits the growth of some harmful bacteria. Several members of the genus have had their genome sequenced.
Source – Wikipedia
Lactobacillus reuteri are Gram-positive, rod-shaped, and anaerobic. These heterofermentatic lactic acid bacterium naturally inhabit the gut of a wide range of organisms, including humans, pigs, chickens and mice . They can also be isolated from human breast milk . In vitro, Lactobacillus reuteri grows optimally on MRS media at 37 degrees Celsius . They have also been found to grow in biofilms . The Food and Agricultural Organization of the United Nations describes probiotics as “live microorganisms which when administered in adequate amounts confer a health benefit on the host,”  an idea first vocalized by Elie Metchnikoff, in the early 1900’s . L. reuteri produces reuterin, an antimicrobial that inhibits growth of harmful bacteria, fungi, and protozoa. Due to these probiotic properties, L. reuteri is believed to be a promising therapy for the alleviation and reduction of certain illnesses related to gastrointestinal health, oral health, and urogenital health, including infantile colic, eczema, and H. pylori infection .
Source – microbewiki.kenyon.edu