Enrichment Culture

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enrichment culture

[in′rich·mənt ‚kəl·chər]
A medium of known composition and specific conditions of incubation which favors the growth of a particular type or species of bacterium.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Enrichment Culture


a culture containing microorganism cells grown on a selective nutrient medium. Enrichment cultures were proposed by the Russian microbiologist S. N. Vinogradskii. The special composition of the nutrient media creates conditions that promote the growth of microorganisms with certain physiological properties. For example, when soil, water, or sediment from a body of water is cultured on a medium containing glucose and several mineral salts but no nitrogen compounds, nitrogen-fixing microorganisms begin to grow in the culture. Enrichment cultures of bacteria that decompose cellulose can be obtained on a medium containing cellulose as the sole source of carbon.

Enrichment cultures must always be prepared before pure cultures of the microorganisms can be isolated. They can be obtained in the presence of growth factors, such as vitamins and amino acids, by adding a smaller number of bacterial cells to the medium. As a result, four to ten times more microorganisms can be found in soil and water than when they are cultured on media lacking growth factors.


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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The kits provide rapid detection of pathogen DNA isolated from enrichment cultures of potentially contaminated food samples in addition to specific Internal Controls.