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Physiology ofAnabaena khannae andChlorococcum humicola under fluoride stress

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Abstract

Sodium fluoride showed pH-dependent physiological responses in the two test microalgaeAnabaena khannae andChlorococcum humicola. A. khannae showed severe membrane damage with fluoride at low pH with leakage of pigments and electrolytes. Annihilation of photosynthesis along with inhibition in14C uptake was observed at pH 6 with 50 mg/L fluoride. While respiration was less affected in the cyanobacterium,C. humicola showed 30 % inhibition in respiratory activity. Resistance ofC. humicola to fluoride toxicity has been attributed to the hindrance provided by the thick cell envelope, intracellular compartmentation and increase in extracellular pH as a consequence of its metabolism.

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Authors and Affiliations

  1. Department of Microbiology, Maharshi Dayanand Saraswati University, 305001, Afmer, Rajasthart, India

    M. Bhatnagar & A. Bhatnagar

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  1. M. Bhatnagar
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  2. A. Bhatnagar
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Bhatnagar, M., Bhatnagar, A. Physiology ofAnabaena khannae andChlorococcum humicola under fluoride stress. Folia Microbiol 49, 291–296 (2004). https://doi.org/10.1007/BF02931045

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  • DOI: https://doi.org/10.1007/BF02931045

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