EVALUATION OF OCCURRENCE OF AUXOTROPHIC ESCHERICHIA COLI IN SOME KARELIAN RESERVOIRS

Studied is the nutrient requirements in growth factors among 199 Escherichia coli cultures, isolated from a series of water reservoirs in Karelia that differ in type and intensity of human impact. Revealed is the fact that auxotrophic E. coli were found in all surveyed reservoirs. Minimal percentage...

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Bibliographic Details
Published in:Proceedings of the Karelian Research Centre of the Russian Academy of Sciences
Main Authors: Natalia Sidorova, Ekaterina Zatsarinnaya
Format: Article in Journal/Newspaper
Language:English
Russian
Published: Karelian Research Centre of the Russian Academy of Sciences 2015
Subjects:
the requirement in growth factors
auxotrophy
escherichia coli
amino acids
microbiological assessment of water reservoirs
Science
Q
Onega
karelian
Online Access:https://doi.org/10.17076/eb218
https://doaj.org/article/e4cbcec60f8c45feb09a7372026dc53d
Description
Summary:Studied is the nutrient requirements in growth factors among 199 Escherichia coli cultures, isolated from a series of water reservoirs in Karelia that differ in type and intensity of human impact. Revealed is the fact that auxotrophic E. coli were found in all surveyed reservoirs. Minimal percentage of E. coli that require in growth factors observed in the central part of Onega Lake. It is noted that the occurrence of auxotrophs depend on the level of water pollution. In the reservoirs that are experiencing intense anthropogenic pollution most isolates were multiple auxotroph. During cultivation of Escherichia coli isolates there were discovered auxotrophic variants in almost all amino acids. These results allow evaluating more objectively the results of environmental monitoring of natural microbial communities in general, and correct description of the processes of self-purification within water bodies.

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