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KMID : 0545120070170091477
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Journal of Microbiology and Biotechnology
2007 Volume.17 No. 9 p.1477 ~ p.1482
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Zinc Metal Solubilization by Gluconacetobacter diazotrophicus and Induction of Pleomorphic Cells
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SARAVANAN VENKATAKRISHNAN SIVARAJ
OSBORNE JABEZ
Madhaiyan Munusamy
MATHEW LAZAR
Chung Jong-Bae
Ahn Ki-Sup
Sa Tong-Min
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Abstract
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Abstract Gluconacetobacter diazotrophicus strain PAl5 exhibited a minimum inhibitory concentration value of 11 mM in an LGI medium amended with ZnCl2. When an LGI medium was amended with Zn metal, solubilization halos were observed in a plate assay, and further solubilization was confirmed in a broth assay. The maximum solubilization was recorded after 120 h with a 0.1% Zn metal amendment. During solubilization, the culture growth and pH of the broth were indirectly correlated. Using a Fourier Transform Infrared Spectroscopy analysis, one of the agents solubilizing the Zn metal was identified as gluconic acid. When the Zn-amended broth was observed under a bright field microscope, long involution cells were observed, and further analysis with Atomic Force Microscopy revealed highly deformed, pleomorphic, aggregate-like cells.
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KEYWORD
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Gluconacetobacter diazotrophicus, Zn metal solubilization, FT-IR, aggregate-like cells, gluconic acid
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