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김선일,권규혁,나재운 조선대학교 생산기술연구소 1991 生産技術硏究 Vol.13 No.1
The reaction of N-hydtoxysuccinimide with polyacrylic acid gave poly(N-acryloxysuccinimide), whose reaction with ampicillin and amoxycillin provided polymeric drugs. The structures of polymeric drugs were characterized by infrared and nuclear magnetic resonace spectroscopy. Antimicrobial activity of polymeric drugs was examined against various gram positive and gram neg-ative bacteia. Ampicillin derivatives revealed excellent antibacterial activity against Alcaligenes faecalis IFO 13130 and Staphylococcus aureus ATTCC 25923. Amoxycillin derivatives revealed excellent antibacterial activity against Salmonella typhimuriurn TV 119, Staphylococcus aureus FDA 209P and Bacillus lincheniformis ATCC 14580. The polymeric drugs have no antimicrobial activity against Candida alibicans ATCC 10231.
전윤,차월석,권규혁,이동병 조선대학교 생산기술연구소 2000 生産技術硏究 Vol.22 No.1
In this study, we examined about effectives of the drug release by used glutaraldehyde amount and molecular weight varieties of chitosan in DDS. The release experiments of chitosan microspheres containing norfloxacin were operated in the phosphate buffer solutions of pH 7.4 and 37℃, and its results were as follows. In the linearly release time of drug, chitosan microspheres (Mw 190,000) of used glutaraldehyde 1 mL and 2 mL were 45 and 64 days, and chitosan microspheres (Mw 350,000) of used glutaralhyde 1 mL and 2 mL were 60 and 80 days relatively. These results showed more effective drug releases in the increments of molecular weight and glutaraldehyde In short, the formulation allows chitosan microspheres to suppress the burst effect of the drug release mechanism, which led to the controlled release pattern and microspheres
박양호,손효진,김경주,권규혁,이중헌 한국공업화학회 2003 응용화학 Vol.7 No.1
In this study, the hybitd reactor has used to remove H_2S from the toxic gas. Since the oxidation and reduction reactors were combined, theri sizes were important to stabilize developed process. The optimal sizes of oxidation and reduction reactors were determined considering iron oxidation rate and H_2S removal rate. The optimal ratio of reactor size was 4 L for oxidation reactor to 1 L for reduction reactor.Immobilized Thiobacillus ferrooxidans has been developed to minimize the size of oxidation reactor. Since the immobilized cell enhanced the oxidation rate, it was possible to incrase H_2S removal efficiency. It was possible to incerase operation time because immobilized cell can survie lger than free cell.
철 산화균(Thiobacillus ferrooxidans)을 이용한 황화수소 제거-온도변화에 따른 황화수소 제거효율변화
박양호,손효진,김려화,권규혁,이중헌 한국공업화학회 2002 응용화학 Vol.6 No.2
Effects of temperature on hydrogen sulfide removal efficiency has been studied in this research. Two reactors which combined iron oxidization reactor and reduction reactor were manufactured. Iron oxidation reactor was used to oxidize Fe(II) to Fe(III) with Thiobacillus ferrooxidans and the hydrogen sulfide was oxidized to make element sulfur with the reduction of iron. The optimal temperature for the iron oxidation was 30℃ however that of iron reduction was 40℃. From this result, the optimal continuous operation conditions has been determined.
Kyu Hyuk Kwun,Geun-Joong Kim,신현재 한국생물공학회 2009 Biotechnology and Bioprocess Engineering Vol.14 No.3
This study assesses the use of ultrasonication to improve the extraction process of classical solvent extraction methods for extracting isoflavones from the kudzu roots waste. The kudzu roots waste was produced after squeezing fresh kudzu roots to make juice. The effects of extraction time, extraction temperature, ultrasonic power, and ethanol concentration in ethanol/ water mixtures were investigated. The extraction yield was found to increase with extraction time and temperature. The application of ultrasonication-assisted extraction (UAE) increased the extraction yield of water/ethanol mixture (20:80) at 25°C 3 fold. A maximum amount (7.28 g) of isoflavone was obtained from 100 g of dried kudzu roots waste by UAE with water/ ethanol mixture (20:80) for 6 h at 80°C. Combining the use of ultrasonication with conventional vacuum evaporation method also reduced the concentration time for extracts from 45 to 24 min
N-Vinyl Phthalimidine과 ㅡMaleic Anhydride의 Copolymerization Kinetics에 관한 연구
權圭赫,曺秉旭,趙誠烋 朝鮮大學校 1976 綜合論文集 Vol.1976 No.-
The preparation and copolymerization of N-vinyl phthalimidine have been investigated. The monomer was prepared by dehydrochlorination of N-(β-chloroethyl) phthalimidine. Polymerization was carried out in the presence of radical initiator in solution. Copolymerization with maleic anhydride was carried out in acetone by benzoyl peroxide. It was found that the component of the copolymer is alternating form. The monomer reactivity ratios calculated from the copolymerization data of N-vinylphth-alimidine (M1) and maleic anhydride (M2) were r₁=0.035, r₂=0.001. (insolvent as acetone.)