Research About Growth Promotion Effects Of Graphite On Microorganisms

The excellent biocompatibility of carbon materials are widely accepted and utilized by researchers and commercial applications currently. However, the mechanism of its excellent biocompatibility remains unknown for a long time. Many efforts are placed on the biocompatibility of carbon materials through international cooperation researches. The focuses of current research mainly concern the growth promotion effects of microorganism affected by graphite powders. The research is expected to be significant in elucidating the hypostasis about the biocompatibility of carbon materials, and explaining why the surface of carbon fibers could both quickly and firmly immobilize much of activated sludge in bio-film wastewater treatment.For verifying the growth-promotion effects of carbon materials on microorganism, the current research adopted Bacillus subtilis and Bacillus subtilis var. niger, Saccharomyces cerevisiae and canidia Albicans as receptor microorganisms, controlled the growth condition such as changing the component concentration of culture medium, adding chemical inhibitor and graphite powder, finally observed the growth process of microorganism, consequently confirmed the affection of inhibitors and graphite on these microorganisms.According to the comparison between different inhibitors and growth conditions mentioned above, it is concluded that:1. Graphite places a strong promotion effect on the growth of microorganisms when inhibited partially. This promotion effect can penetrate through the glass of the Petri dishes and transfer to receptor microorganisms, so it could be considered as electromagnetic effect rather than chemical factor.2. When the growth of receptor microorganism was inhibited absolutely or not at all, graphite can't accelerate the growth speed evidently.