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Aerobic reduction of perchlorate by bacteria isolated in Kerala, South India

100%

Shete A. , Mukhopadhyaya P. N. , Acharya A. , Aich B. A. , Joshi S. , Ghole V. C.

Journal of Applied Genetics

2008

tom 49

nr 4

425-431

Possibility of perchlorate reduction by microbes raises hope for an eco-friendly mode of degradation of this toxic rocket fuel. This study reports 3 isolates (A1, A2 and A3) capable of molybdenum-independent degradation of perchlorate under aerobic conditions. The rate of degradation was the highest when perchlorate concentration was 17 mM, and then 3.2 mM, 4.7 mM and 4.1 mM of perchlorate was reduced by isolates A1, A2 and A3 (respectively) after 72 h at 28oC under aerobic conditions. Presence of perchlorate at a concentration higher than 17 mM resulted in some inhibition of perchlorate reduction. 16S ribosomal RNA gene analysis revealed isolate A1 to be Pseudomonas stutzeri (Proteobacteria) while isolates A2 ad A3 where found to belong to the genus Arthrobacter (Actinobacteria). The study, apart from demonstrating ribotyping as a rapid method of identification of economically important soil microbes, also raised prospects for using artificial consortia for environmental degradation of perchlorate, without apparent domination of Dechloromonas spp. (a group of microbes known for perchlorate remediation in the environment).

Changes in cellular fatty acids composition induced by phenol and catechol in Pseudomonas vesicularis and Pseudomonas stutzeri

88%

Mrozik A. , Labuzek S. , Piotrowska-Seget Z.

Biotechnologia

2004

nr 1

244-252

The changes in cellular fatty acid profiles, determined by gas chromatography, of Pseudomonas vesicularis and Pseudomonas stutzeri growing in a modified minimal medium with catechol or phenol are presented in this paper. P. vesicularis increased its ratio of saturated/unsaturated fatty acids from 1.92 to 4.05 and 5.72 when grown on glucose, phenol and catechol, respectively. In the case of P. stutzeri, the ratio changed from 2.56 to 8.28 and 4.65 under the same growth conditions. The increase in the abundance of saturated and cyclopropane fatty acids and forming new iso and anteiso fatty acids during growth of tested strains in the presence of catechol and phenol are suggested as a possible mechanism to tolerate tested aromatic compounds.