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Ecological Characteristics of Actinomycetes from Mercury and Chrome Polluted Soil  

Cho Min-Hye (Department of Biotechnology, Mokwon University)
Han Sang-Mi (Department of Agricultural Biology, National Institute of Agricultural Science and Technology)
Baek Ha-Ju (Gyeongsang Buk-Do Government Public Institute of Health and Environmental)
Whang Kyung-Sook (Department of Biotechnology, Mokwon University)
Publication Information
Korean Journal of Environmental Biology / v.24, no.1, 2006 , pp. 38-45 More about this Journal
Abstract
Ecological characteristics of microbial populations inhabiting heavy metal polluted soil were investigated. The samples were collected from 293 sites around an factory and industry at Gyeoungsangbuk-do. We measured the contents of seven heavy metal elements (Cd, Cu, As, Hg, Pb, $Cr^{6+}$, CN), seven sites have been seriously contaminated by mercury and chrome. A quantitative evaluation of microbial populations in mercury and chrome contaminated soil was examined by using plate count method. Bacterial numbers in polluted soil samples ranged from $7.4X10^5\;to\;9.3X10^7\;cfu\;g^{-1}$, about $10\sim100$ fold less than the count for the unpolluted soil. Moulds were not detected in chrome polluted soil. The log values of actinomycetes of each contaminated soil samples were log ranged from 6.18 to 7.52. The ratio of actinomycetes was similar to unpolluted soil. The investigation showed actinomycetes to be the major microbial population inhabiting the mercury and chrome polluted soil. Thirty-one isolates among the total isolates were examined for antibacterial activity. These isolates were identified based on a phylogenetic analysis using 16S rRNA gene nucleotide sequences, they were categorized in three major phylogenetic groups, belong to the Streptomyces (6 strains), Saccharopolyspora (3 strains), Nocardiodes (1 strain). On the phylogenetic tree, the clade consisting of five isolates were distantly related to all of the established Streptomycetes genera, indicating the possibility as members of new species.
Keywords
Actinomycetes; Chrome; Mercury; Micrflora phylogeng;
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