subtlbacilli.info

Bacillus subtilis  is a Gram-positive bacterium, rod shaped and catalase-positive.  It was originally named Vibrio subtilis by Christian Gottfried Ehrenberg and renamed Bacillus subtilis by Ferdinand Cohn in 1872 (subtilis being the Latin for 'fine'). This is found in soil and the gastrointestinal tract of ruminants and humans. B. subtilis cells are typically rod-shaped, and are about 4-10 micrometers (μm) long and 0.25–1.0 μm in diameter and are arranged in singles or chains. B. subtilis is a facultative anaerobe and had been considered as an obligate aerobe until 1998. As with other members of the genus Bacillus, it can form an endospore, to survive extreme environmental conditions of temperature and desiccation more quickly against many stress situations such as acidic, alkaline, osmotic, or oxidative conditions or ethanol. B. subtilis bacteria use their flagella for a swarming motility. This motility occurs on surfaces, for example on agar plates,other  than in liquids. . Cells arranged next to each other can only swarm together, not individually. These arrangements of cells are called 'rafts'. In order for B. subtilis bacteria to swarm, they need to secrete a slime layer which includes surfactin, a surface tension-reducing lipopeptide, as one of its components. B. subtilis has proven highly amenable to genetic manipulation, and has become widely adopted as a model organism for laboratory studies, especially of sporulation, which is a simplified example of cellular differentiation. In terms of popularity as a laboratory model organism, B. subtilis is often considered as the Gram-positive equivalent of Escherichia coli, an extensively studied Gram-negative bacterium

COMMERCIAL IMPORTANCE:

Present in the environment in the air, soil and water, B. subtilis is a bacterium that is generally harmless to humans. It does, however, have an enviable ability to produce enzymes that mankind has harnessed for industry. The species can also break down various naturally-occurring pollutants, which is useful for environmental purposes, and has additional uses as a pesticide. The value of microbes like B. subtilis to industry is that cultivating them on a large scale to produce enzymes and other substances tends to be cheap and relatively uncomplicated.

Clothes detergent may contain enzymes produced by B. subtilis

Cleaning Agents

Some industries use B. subtilis to produce enzymes that are useful in the cleaning industry. For example, the species can produce proteases, which are enzymes that break down protein. These proteases are an ingredient in some washing detergents and can also be used in the leather industry to break down unwanted substances on skins.

Paper and Textile Industries

Amylases, which break down starch, are some other useful enzymes that B. subtilis can produce in bulk. Starch breakdown is a useful step in the production of paper and in the treatment of textiles.

Clothes detergent may contain enzymes produced by B. subtilis

Present in the environment in the air, soil and water, B. subtilis is a bacterium that is generally harmless to humans. It does, however, have an enviable ability to produce enzymes that mankind has harnessed for industry. The species can also break down various naturally-occurring pollutants, which is useful for environmental purposes, and has additional uses as a pesticide. The value of microbes like B. subtilis to industry is that cultivating them on a large scale to produce enzymes and other substances tends to be cheap and relatively uncomplicated.

Cleaning Agents

Some industries use B. subtilis to produce enzymes that are useful in the cleaning industry. For example, the species can produce proteases, which are enzymes that break down protein. These proteases are an ingredient in some washing detergents and can also be used in the leather industry to break down unwanted substances on skins.

Paper and Textile Industries

Amylases, which break down starch, are some other useful enzymes that B. subtilis can produce in bulk. Starch breakdown is a useful step in the production of paper and in the treatment of textiles.

Clothes detergent may contain enzymes produced by B. subtilis

Present in the environment in the air, soil and water, B. subtilis is a bacterium that is generally harmless to humans. It does, however, have an enviable ability to produce enzymes that mankind has harnessed for industry. The species can also break down various naturally-occurring pollutants, which is useful for environmental purposes, and has additional uses as a pesticide. The value of microbes like B. subtilis to industry is that cultivating them on a large scale to produce enzymes and other substances tends to be cheap and relatively uncomplicated.

Cleaning Agents

Some industries use B. subtilis to produce enzymes that are useful in the cleaning industry. For example, the species can produce proteases, which are enzymes that break down protein. These proteases are an ingredient in some washing detergents and can also be used in the leather industry to break down unwanted substances on skins.

Paper and Textile Industries

Amylases, which break down starch, are some other useful enzymes that B. subtilis can produce in bulk. Starch breakdown is a useful step in the production of paper and in the treatment of textiles.

Pesticide Industry

Certain bacterial species can interfere with the ability of pathogens to attack crops. A strain of B. subtilis called QST 713 is able to trigger a strong resistance to attack by fungi in crops that have been treated with it. The bacterium can also combat the potentially infectious fungi by various mechanisms, such as direct competition for nutrients.

Pollution Treatment

The practice of using species like B. subtilis to break down pollutants is called bioremediation. The bacterium can actually eat up light fractions of crude oil like paraffin and convert them into less environmentally harmful substances. B. subtilis can also produce a surfactant, which helps to disperse crude oil, and the enzymes that it can produce include lipases, which can be turned into bioremediants for fat-rich pollutants like sewage and other waste water.

Food Industry

As B. subtilis produces a lot of enzymes that are valuable in fermentation, the species is in demand for certain food processing industries. An additional point in B. subtilis favor is that the bacterium is classed by the U.S. Food and Drug Administration as "Generally Regarded As Safe" or "GRAS," which means it is regarded as safe for consumers to eat. An example of a B. subtilis -fermented food is natto, a soybean product popular in Japan.