Document Detail

Laser impact on marine planktonic diatoms: an experimental study using a flow cytometry system.
MedLine Citation:
PMID:  14618697     Owner:  NLM     Status:  MEDLINE    
A flow cytometry system was used to evaluate the impact of pulsed laser irradiations from an Nd:YAG laser on two marine coastal water diatoms, Chaetoceros gracilis and Skeletonema costatum. Three flow speeds, i.e. 9, 18 and 27 ml min-1 and three laser fluences, i.e. 0.025, 0.05 and 0.1 J cm-2 pulse-1 were tested during this study. The reduction in cell density and chlorophyll a (chl a) concentrations were monitored by reference to non-irradiated samples as controls. Upon irradiation, the cell density and the chl a concentrations became reduced significantly compared to the control (one way ANOVA p < 0.001 for the cell density in both the species and p < 0.05 for chl a concentrations in both species). A maximum mortality of 0.77 log10 (about 83%) for C. gracilis and 0.68 log10 (about 78%) for S. costatum was observed at 9 ml min-1 flow speed and 0.1 J cm-2 laser fluence. The maximum reduction observed in the chl a concentration was about 26% (control 0.413 and sample 0.306 mg ml-1) for C. gracilis and 27% (control 0.222 and sample 0.16 mg ml-1) for S. costatum, when the flow rate was 9 ml min-1 and the fluence 0.1 J cm-2. In general, mortality increased with an increase in the laser fluence. The results thus show if the cooling water is laser-irradiated to mitigate biofouling, this could result in significant damage to the planktonic flora of the flowing seawater system, which in turn might reduce algal biofilm formation on industrially important structures. The reduction in the chl a concentration showed that the laser irradiations also could result in a significant reduction in the primary productivity of the cooling water.
Kanavillil Nandakumar; Hideki Obika; Tatsuya Shinozaki; Toshihiko Ooie; Akihiro Utsumi; Tetsuo Yano
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Biofouling     Volume:  19     ISSN:  0892-7014     ISO Abbreviation:  Biofouling     Publication Date:  2003 Apr 
Date Detail:
Created Date:  2003-11-17     Completed Date:  2003-11-28     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9200331     Medline TA:  Biofouling     Country:  England    
Other Details:
Languages:  eng     Pagination:  133-8     Citation Subset:  IM    
Marine Eco-materials Research Group, Marine Resources and Environment Research Institute (AIST), 2217-14 Hayashi-cho, Takamatsu, Kagawa 761-0395, Japan.
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MeSH Terms
Analysis of Variance
Chlorophyll / chemistry
Colony Count, Microbial
Diatoms / physiology*,  radiation effects*
Flow Cytometry / methods*
Reg. No./Substance:
1406-65-1/Chlorophyll; 479-61-8/chlorophyll a

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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