Document Detail


Immediate and long-term impacts of UV-C irradiation on photosynthetic capacity, survival and microcystin-LR release risk of Microcystis aeruginosa.
MedLine Citation:
PMID:  22209277     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
In this study, the immediate and long-term impacts of shortwave ultraviolet (UV-C) irradiation on photosynthetic capacity, survival, and recovery of Microcystis aeruginosa were investigated. The risk of microcystin-LR (MC-LR) release during irradiation was also estimated. The cell density was determined by a flow cytometry, and typical chlorophyll fluorescence parameters, including the effective quantum yield, photosynthetic efficiency and maximal electron transport rate, were measured by a pulse amplitude modulated (PAM) fluorometer. Under various UV-C dosages (140-4200 mJ cm(-2)), photosynthetic capacities were reduced, to different degrees, accompanied by slight cytoclasis and complete degradation of extracellular MC-LR immediately after irradiation. In a 6-d cultivation following UV-C irradiation, cell density and extracellular MC-LR in the samples treated by 140 mJ cm(-2) UV-C irradiation increased from 4.0 × 10(6) cells mL(-1) and 8 μg L(-1) to 5.1 × 10(6) cells mL(-1) and 20 μg L(-1), respectively. Significant M. aeruginosa cytoclasis (cell density from 4.0 × 10(6) to 1.0 × 10(6) cells mL(-1)) and MC-LR release (2-25 μg L(-1)) occurred when the UV-C dosage reached 350 mJ cm(-2). Cell cytoclasis and MC-LR release were enhanced in the cultivated samples under higher UV-C dosages. Results revealed that photosynthetic parameters were useful tools to predict the recovery profiles of M. aeruginosa cells, and the MC-LR release risk should be considered after UV-C inactivation.
Authors:
Huase Ou; Naiyun Gao; Yang Deng; Junlian Qiao; Hao Wang
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-12-16
Journal Detail:
Title:  Water research     Volume:  -     ISSN:  1879-2448     ISO Abbreviation:  -     Publication Date:  2011 Dec 
Date Detail:
Created Date:  2012-1-2     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0105072     Medline TA:  Water Res     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2011 Elsevier Ltd. All rights reserved.
Affiliation:
State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Mingjing building, 1239# Siping Road, Shanghai 200092, PR China.
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