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Gopal Panthi,박수진,채수형,김태우,정혜종,Seong-Tshool Hong,박미라,김학용 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.45 No.-
Ag3PO4/PAN composite nanofibers have been fabricated by simple and low cost electrospinningtechnique followed by surface modification of PAN nanofibers with amidoxime ( C(CN2)¼NOH) groupsto utilize as anchoring sites for Ag+ ions through coordinate bonding. Subsequently, the coordinated Ag+ions were allowed to react with PO43 ions in order to form Ag3PO4/PAN composite nanofibers. Thusobtained composites were characterized by FESEM, XRD, TEM, FTIR, XPS and UV–vis. Experimentalresults revealed that composite nanofibers prepared by reacting ( C(CN2)¼NOH) functionalized PANnanofibers with 0.02 M solutions of AgNO3 and Na2HPO4 have higher efficiency towards thephotodegradation and bactericidal activities under visible light.
Bacillus licheniformis SCD121067 균체 생산성 증가를 위한 통계적 생산배지 및 발효조건 최적화
정유민(Yoo-Min Jeong),이주희(Ju-Hee Lee),정혜종(Hea-Jong Chung),전계택(Gie-Taek Chun),윤순일(Soon-Il Yun),정용섭(Yong-Seob Jeong) 한국생물공학회 2010 KSBB Journal Vol.25 No.6
In this work, mass production of Bacillus licheniformis SCD121067 through medium optimization by statistical experimental method was studied. First, galactose, yeast extract and potassium phosphate dibasic were selected as carbon, nitrogen and phosphate sources for mass production of B. licheniformis SCD121067 by using one factor at a time method. Second, according to the result of Plackett-Burman experimental design, key factors was yeast extract and K₂HPO. Finally, the response surface methodology was performed to obtain the optimum concentrations of two selected variables. The optimized medium composition consisted of 20 g/L galactose, 36 g/L yeast extract, 0.41 g/L K₂HPO₄, 0.25 g/L Na₂CO₃, 0.4g/L MgSO₄ and 0.01g/L CaCl₂. Dry cell weight (15.4 g/L) by optimum production medium were increased 10 times, as compared to that determined with basic production medium (1.5 g/L). Fermentation conditions were examined for the mass production of B. licheniformis. The effect of temperature, agitation speed, pH and aeration rate on the mass production of B. licheniformis were also studied in a batch fermenter which was carried out in a 2.5 L bioreactor with a working volume of 1.5 L containing optimized production medium. As a result, dry cell weight of batch culture was 30.7 g/L at 42℃, 300 rpm, pH 8.0 and 2 vvm.