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Please use this identifier to cite or link to this item:
http://drs.nio.org/drs/handle/2264/3865
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| Title: | Study of changes in bacterial and viral abundance in formaldehyde - Fixed water samples by epifluorescence microscopy |
| Authors: | Parvathi, A. Radhakrishnan, S. Sajila, M.P. Jacob, B. |
| Citation: | Environmental Monitoring and Assessment, vol.177(1-4); 2011; 227-231 |
| Issue Date: | 2011 |
| Publisher: | Springer |
| Abstract: | 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 |
| Document type: | Journal Article |
| Copyright: | An edited version of this paper was published by Springer. This paper is for R & D purpose and Copyright [2011] Springer. |
| URI: | http://drs.nio.org/drs/handle/2264/3865 |
| Appears in Collections: | Biological Sciences
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