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Truce with oxygen - A naerobiosis outcompete aerobiosis in the Antarctic lacustrine bacteria

DRS at CSIR-National Institute of Oceanography

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Title Truce with oxygen - A naerobiosis outcompete aerobiosis in the Antarctic lacustrine bacteria
 
Creator LokaBharathi, P.A.
Nair, S.
DeSouza, M.J.B.D.
Chandramohan, D.
 
Subject anaerobic bacteria
anaerobiosis
bacterial counters
fermentation
sulphate reduction
redox potential
supersaturation
 
Description The total number of bacteria counted directly by epifluorescent microscopy showed that they ranged from 10 sup(8)-10 sup(-1) in Antarctic lake water samples. The percentages of retrievable viable counts (RVC) of anaerobic bacteria (AnB) was greater than aerobic counts. Among the different groups of anaerobes, the order of retrieval was Thiobacillus denitrificans like organisms (TDLO) greater than fermentative bacteria (FB) greater than sulfate reducing bacteria (SRB). The total direct anaerobic viable counts (TDAnVC) was one order more than the total direct aerobic viable counts (TDAeVC). Laboratory experiments with one of the lake-isolates indicated that there was a tendency to express higher viability of 61% at redox potential (Eh) ranging from -281 to -335 mv. It is suggested that the disposition to express increased viability under reducing conditions is a strategy to counteract stress due to supersaturation of oxygen in the cold lacustrine environment.
 
Date 2009-01-10T11:49:37Z
2009-01-10T11:49:37Z
1999
 
Type Journal Article
 
Identifier Current Science, Vol.76; 1585-1587p.
http://drs.nio.org/drs/handle/2264/1838
 
Language en
 
Rights Copyright [1999]. All efforts have been made to respect the copyright to the best of our knowledge. Inadvertent omissions, if brought to our notice, stand for correction and withdrawal of document from this repository.
 
Publisher Current Science Association, Bangalore, India