Journal of Microbiology

Jae-heon Kim

2 Articles

Formation and Dispersion of Mycelial Pellets of Streptomyces coelicolor A3(2): Yul-Min Kim , Jae-heon Kim; J. Microbiol. 2004;42(1):64-67.; DOI: https://doi.org/1997 [pii]

Abstract PDF: The pellets from a culture of Streptomyces coelicolor A3(2) that were submerged shaken were disintegrated into numerous hyphal fragments by DNase treatment. The pellets were increasingly dispersed by hyaluronidase treatment, and mycelial fragments were easily detached from the pellets. The submerged mycelium grew by forming complexes with calcium phosphate precipitates or kaolin, a soil particle. Therefore, the pellet formation of Streptomyces coelicolor A3(2) can be considered a biofilm formation, including the participation of adhesive extracellular polymers and the insoluble substrates.

Heavy Metal Biosorption and its Significance to Metal Tolerance of Streptomycetes: Jae-young Rho , Jae-heon Kim; J. Microbiol. 2002;40(1):51-54.

Abstract PDF: Heavy metal adsorptions of four streptomycetes were compared with each other. Among the test strains, Streptomyces viridochromogenes showed the most efficient metal binding activity, which was carried out by cell wall as well as freeze-dried mycelium. An order of adsorption potential (zinc > copper > lead > cadmium) was observed in single metal reactions, whereas this adsorption order was disturbed in mixed-metal reactions. The metal adsorption reactions were very fast, pH dependent and culture age-independent, suggestive of a physico-chemical reaction between cell wall components and heavy metal ions. The metal tolerant stains presented the weakest adsorbing activity, indicating that the metal biosorption was not the basis of the metal tolerance.

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