QVprep Microbiology Lessons

Bacterial Growth

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Acidophile: A microorganism that requires an environment with a pH that is less than 7 for optimum growth is referred to as acidophile. Acidic solutions have a pH range of 0-6.99 and therefore a bacterium that requires this pH is classified as an acidophile.


Agar: The solidifying agent used in microbiological media is agar. Agar is a complex polysaccharide that is the product of a red marine algae; it is an appropriate solidifying agent because remains solid at temperatures as high as 100° C before it liquefies. Agar is a polysaccharide (carbohydrate) that is produced by red marine algae.


Binary fission: Bacteria grow by Binary Fission. Binary fission is a form of asexual reproduction whereby one bacterium splits into two.


Capnophiles: Bacteria that require elevated amounts of carbon dioxide for growth are referred to as capnophilic. Capneic refers to carbon di oxide (CO2) conditions; capnophiles are bacteria that require (phile = love) a CO2 environment for optimum growth (this does not mean or imply that they are anaerobes).