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Asian Journal of Biological Sciences
  Year: 2009 | Volume: 2 | Issue: 1 | Page No.: 14-20
DOI: 10.3923/ajbs.2009.14.20
 
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The Behavior of Immobilized Cyanobacteria Anabaena torulosa as an Electrochemical Toxicity Biosensor

Tay Chia Chay, Salmijah Surif and Lee Yook Heng

Abstract:
The cyanobacteria Anabaena torulosa was immobilized onto an oxygen electrode using a poly (2-hydroxylethyl methacrylate) matrix. The behavior of the organism towards some toxicants was investigated via inhibition of its photosynthetic activity, which could be monitored by the changes of photosynthetic oxygen release. Using lead and 2, 4-dichlorophenoxyacetic acid (2, 4-D) as the toxicants, it was shown that the cyanobacteria response was not affected by cell age or phase of cell growth. But repetitive exposures to a toxicant such as Pb altered the inhibition behavior of the cyanobacteria (p<0.05). The 50% inhibition of the cyanobacteria by Pb occurred at a concentration of 0.4 mg L-1 Pb whilst for the herbicide 2, 4-D at 0.1 mg L-1. The results showed that the immobilized organism can be used as a toxicity biosensor for the assessment of Pb toxicity in river water samples.
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How to cite this article:

Tay Chia Chay, Salmijah Surif and Lee Yook Heng, 2009. The Behavior of Immobilized Cyanobacteria Anabaena torulosa as an Electrochemical Toxicity Biosensor. Asian Journal of Biological Sciences, 2: 14-20.

DOI: 10.3923/ajbs.2009.14.20

URL: https://scialert.net/abstract/?doi=ajbs.2009.14.20

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