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Aspergillus sp. PS-104 의 액침배양중 mycellial pellet 형성에 미치는 황토의 영향
강선철(Sun Chul Kang),구본성(Bon Sung Koo),태언희(Un Hee Tae) 한국환경농학회 2002 한국환경농학회지 Vol.21 No.1
In order to investigate effects of loess on the mycellial pellet formation a phosphate-solubilizing fungus Aspergillus sp. PS-104 was cultured in potato dextrose broth containing loess. The strain formed an amorphous pellet or loose aggregates agitated at a low speed (50 rpm) while spherical and regular pellets at a high speed (150 rpm). The higher concentration of loess was added, the smaller size of a pellet was formed during the submerged culture of the strain. As shown in results, being cultured in the PDB medium supplemented with 1.0% loess the pellet size was maximally reduced to a fourth compared to the control. Evaluating the addition effect of several components of loess such as SiO_2, Fe_2O_3, Al_2O_3, CaCO_3, CaSO_4 and MgCO_3 on the reduction of mycellial pellet size the higher concentration was supplied, the smaller size of pellet was formed except Al_2O_3 And the smallest pellet size was recorded at the concentration of 1.0% (W/V) magnesium carbonate.
인산가용화균 Penicillium sp. GL - 101 의 유리인산 생성기작에 관한 연구
강선철(Sun Chul Kang),양미옥(Mi Ok Yang),태언희(Un Hee Tae) 한국환경농학회 2001 한국환경농학회지 Vol.20 No.1
We investigated the capability of the phosphate-solubilizing fungus, Penicillium sp. GL-101, to solubilize in vitro some insoluble rock phosphate via possible mechanisms: acidification of the medium, production of chelating metabolites, redox activity, and so on. GL-101 was able to solubilize rock phosphate (mostly calcium phosphate) in a liquid potato dextrose broth(PDB) medium, as determined by spectrophotometric analyses. Acidification was the major mechanism of solubilization since the pH of cultures fell below 4.0 and in cultures containing 1.0%(wlv) loess the pH dropped from 7.0 to 3.2. More than 10 ㎎/mL concentrations of citric acids were detected by high-performance liquid chromatography(HPLC) in the culture supernatants. Also this fungus showed the phosphatase activity (over 1.3 unit) to contribute partially releasing phosphate from rock phosphate, when supplemented with 1.0% loess in culture broth. The chelating activity of GL-101 in culture supernatants was not present because 2-ketogluconic acid, a chelating agent for the phosphate, was produced only a basal level. Therefore, the solubilization mechanism of rock phosphate by Penicillium sp. GL-101 involves both acidification due to citric acid production and phosphatase activity.