کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4410098 | 1307529 | 2012 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Biodegradation of multiple cyanobacterial metabolites in drinking water supplies Biodegradation of multiple cyanobacterial metabolites in drinking water supplies](/preview/png/4410098.png)
The fate of multiple cyanobacterial metabolites was assessed in two Australian source waters. The saxitoxins were the only metabolites shown to be non-biodegradable in Myponga Reservoir water, while microcystin-LR (MCLR) and geosmin were biodegradable in this water source. Likewise, cylindrospermopsin (CYN) was shown to be biodegradable in River Murray water. The order of ease of biodegradability followed the trend: MCLR > CYN > geosmin > saxitoxins. Biodegradation of the metabolites was affected by temperature and seasonal variations with more rapid degradation at 24 °C and during autumn compared with 14 °C and during winter. A microcystin-degrading bacterium was isolated and shown to degrade four microcystin variants within 4 h. This bacterium, designated as TT25, was shown to be 99% similar to a Sphingopyxis sp. based on a 16S rRNA gene fragment. Isolate TT25 was shown to contain a homologue of the mlrA gene; the sequence of which was 99% similar to that of a previously reported microcystin-degrader. Furthermore, isolate TT25 could degrade the microcystins in the presence of copper sulphate (0.5 mg L−1 as Cu2+) which is advantageous for water authorities dosing such algicides into water bodies to control cyanobacterial blooms.
► Biodegradation of metabolites was affected by temperature and seasonal variations.
► Ease of biodegradability followed the trend: MCLR > CYN > geosmin > saxitoxin.
► A microcystin-degrading bacterium was isolated and shown to be closely related to a Sphingopyxis sp.
► Isolate TT25 degraded four microcystin variants within 4 h in the presence of copper sulphate.
Journal: Chemosphere - Volume 87, Issue 10, June 2012, Pages 1149–1154