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Study of changes in bacterial and viral abundance in formaldehyde - Fixed water samples by epifluorescence microscopy

DRS at CSIR-National Institute of Oceanography

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Title Study of changes in bacterial and viral abundance in formaldehyde - Fixed water samples by epifluorescence microscopy
 
Creator Parvathi, A.
Radhakrishnan, S.
Sajila, M.P.
Jacob, B.
 
Subject Marine virus
Epifluorescence microscopy
microbial communities
bacteria
 
Description Accurate measurement of bacterial and viral abundance in coastal marine environments is important to understand the dynamics of microbial communities in these ecosystems. In this study, the effect of formaldehyde preservation on the abundance of bacteria and viruses in water samples from Cochin Backwater was determined by SYBR Green I staining and epifluorescence microscopy. The counts were determined for 45 days in samples fixed with 1?6% formaldehyde. The results suggest rapid decline in counts of bacteria and viruses in samples preserved in formaldehyde, and the decline increased with increase in the final concentration of formaldehyde in the sample. The initial bacterial and viral counts in the sampling site were 5.2 ? 10 sup (6)/ml and 3.9 ? 10 sup (7)/ml, respectively. The bacterial count dropped by 5.1%, 53.3%, 55.7%, and 85% after 1, 7, 15, and 45 days, respectively, in sample fixed with 1% formaldehyde. The decline in viral counts was higher, being 32.4%, 47.9%, 68.1%, and 93% after 1, 7, 15, and 45 days, respectively. Storage of fixed samples at -20 degree Celsius did not halt the decline in microbial counts, suggesting that, irrespective of storage temperature, formaldehyde-fixed samples lead to underestimation of microbial counts
 
Date 2011-06-16T07:00:37Z
2011-06-16T07:00:37Z
2011
 
Type Journal Article
 
Identifier Environmental Monitoring and Assessment, vol.177(1-4); 2011; 227-231
http://drs.nio.org/drs/handle/2264/3865
 
Language en
 
Rights An edited version of this paper was published by Springer. This paper is for R & D purpose and Copyright [2011] Springer.
 
Publisher Springer