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방향족 아미노산에 의한 대장균 serC-aroA Operon의 발현 억제
황우길,사재훈,김경훈,임창진,Hwang, Woo-Gil,Sa, Jae-Hoon,Kim, Kyung-Hoon,Lim, Chang-Jin 한국미생물학회 1994 미생물학회지 Vol.32 No.2
대장균에서 두 가지 다른 아미노산의 생합성에 관여하는 serC 유전자와 araA유전자는 혼합 operon을 이루고 있다. SerC-aroA 혼합 operon의 발현 조절 현상을 serC-aroA-lacZ fusion plasmid pWH2를 이용하여 측정하였다. serC-aroA 혼합 operon의 발현은 L-tyrosine, L=phenulalanine 및 L-tryptophan 등 방향족 아미노산들에 의하여 억제되었다. 방향족 아미노산에 의한 억제 효과는 $tyrR^-$ 균주 혹은 $trpT^-$ 균주에서는 감소하였다. 또한, 방향족 아미노산은 cyclic AMP에 의한 이 operon의 발현 상승 효과를 감소시키기도 하였다. 이들 결과로부터 대장균 serC-aroA 혼합 operon의 발현은 방향종 아미노산들에 의해 억제된다고 추정하였다. The Escherichia coli aroA and serC genes constitute a mixed-function operon which involves in two different amino acid biosynthetic pathways. The regulation of expression of serC-aroA operon was evaluated through the use of a serC-araA-lacZ fusion plasmid pWH2. The expression of the serC-aroA operon was decreased by aromatic amino acids such as tyrosine, tryptophan, and phenylalanine. The repressible effects were diminished in E. coli tyrR of trpR strain, indicating the involvemnt of TyrR of TrpR protein in the repression. Tyrosine was competitie with cAMP in the influence on the expression of the serC-AroA operon. From these data, it was suggested that the serC-aroA operon is controlled by aromatic amino acids in a negative manner.
바이오 디젤유 생산을 위한 대두유 에스테르화 반응의 속도론적 연구
황우람,신용섭 慶星大學校 環境問題硏究所 2002 環境硏報 Vol.12 No.1
The esterification of vegetable oil with methanol is one of the best ways to improve it's combustion characteristics. Therefore, in this study, the process which produce the bio-diesel oil from vegetable oil by the esterification reaction was investigated. Especially, the kinetic study on the esterification reaction of soybean oil was performed. Catalysts used in this study were sodium hydroxide as a homogeneous catalyst and calcium hydroxide as a heterogeneous catalyst. Because sodium hydroxide reacted with free fatty acid in the soybean oil and 0.5wt% of the sodium hydroxide was greater than the free fatty acid content in the soybean oil, it is very important for the completion of esterification reaction that the free fatty acid in the soybean oil should be removed before the esterification reaction. Compared with reaction rate constant of the esterification reaction rate constant of saponification had constant value in case of using sodium hydroxide catalyst. Interestingly, rate constant of the esterification reaction was decresed with increase of sodium hydroxide dosage. Compared with reaction rate constant of the esterification reaction, reaction rate constant of saponification had constant value in case of using sodium hydroxide catalyst. Interestingly, rate constant of the esterification reaction was decresed with increase of sodium hydroxide dosage. Using calcium hydroxide catalyste, reaction rate constants in FAMEs production step were Measured from 0.9141 min-1 to 1.0377 min-1, and reaction rate constants in monoglyceride and diglyceride production steps were measured from 0.0093 min-1 to 0.0386 min-1 according to the calcium hydroxide dosage. So, monoglyceride and diglyceride production steps rate controlling steps in overall esterification reaction.
난용성 항진균제 이트라코나졸의 액상제제화에 의한 생체이용율 개선
황우신,권광일,방규호,Hwang, Woo-Sin,Kwon, Kwang-Il,Bang, Kyu-Ho 대한약학회 2000 약학회지 Vol.44 No.6
This study was to develop an effective itraconazole liquid preparation which exhibits an enhanced bioavailability. The solubility of itraconazole was increased (72-fold) in itraconazole liquid preparation as compared with itraconazole powder. The dissolution rate of itraconazole was higher for itraconazole liquid preparation filled into a hard gelatin capsule with 90% release within 20 min as compared to 55% for $Sporanox^{\circledR}$capsules. The oral absorption of itraconazole liquid preparation and $Sporanox^{\circledR}$tablets were studied in the rat. The area under the concentration-time curve $(AUC_{0-24hr})$ of itraconazole liquid preparation ($90.25\;{\pm}\;8.36\;{\mu}g{\cdot}hr/ml$) increased by 6.2 times compared to that of Sporanox tablets ($14.58\;{\pm}\;1.26\;{\mu}g{\cdot}hr/ml$) after oral administration of itraconazole 15 mg/rat each. $C_{max}$ also increased to $6.87\;{\pm}\;1.15\;{\mu}g/ml$ after administration of liquid preparation $1.58\;{\pm}\;0.16\;{\mu}g/ml$ of $Sporanox^{\circledR}$tablets. These results indicate that in vivo bioavailability of itraconazole liquid preparation was significantly enhanced as compared with $Sporanox^{\circledR}$tablets.
황우,장은정 한중법학회 2016 中國法硏究 Vol.26 No.-
시대와 기술의 발전에 따라 토지자원은 절대적으로 부족한 상황에 처해 있다. 따라서 도시화 과정에서 공간의 개발과 이용은 점차적으로 확대되고 있다. 그러나 우리나라의 이 분야에 관한 입법은 아직 걸음마 단계라 할 수 있다. 그러므로 본 논문은 충칭시 인민정부가 발의한 “충칭시 지상(지하)공간건설용지관리잠행방법(重庆市地上(地下)空间建设用地管理暂行办法)”(草案)에 기초한 공간건설용지사용권(空间建设用地使用权)의 입법문제에 관한 연구로서 합리적인 공간건설용지사용권(空间建设用地使用权)에 관한 입법 구상을 제시하고 아울러 이를 통해 새로운 재산권과 관련 제도의 보완, 그리고 토지이용의 현대화와 효율성 제고에 이바지하고자 한다. With the development of the times and technology, land resources scarce increasingly. The development and utilization of space in city construction is more and more popular. However, the legislation of this field in our country is still in the very beginning status. The existing legal system can not effectively deal with the disputes of space utilization, Therefore, this article will try to study and construct the system of the right to use the space construction land. It will be based on the <The Interim Measures for the management of land (underground) space in Chongqing >(Draft) drafted by Chongqing Government. The aim is to perfect this new type of property right and its related system, to make land using modernized and fully and high efficiency.