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고온·알칼리성 Bacillus sp.의 Catabolite Repression 저항성 변이주로부터 Cellulase 및 Xylanase의 생산
최수철,정영철,강갑석,심기환,성낙계 慶尙大學校 1990 論文集 Vol.29 No.2
고온·알칼리성 cellulase 및 hemicellulase 생성 미생물을 분리할 목적으로 pH 10.3의 PY-CMC배지에서 55℃로 3회 연속 직접배양하여 효소 생성능이 우수한 20여균주를 분리하였고, 그 중에서 2개균주를 최종 선정하여 균학적 성상을 조사한 결과 고온·알칼리성 Bacillus속과 거의 일치하였다. 선정, 동정된 고온·알칼리성 Bacillus sp. F204와 F1020은 α-1, 4-glucose 등에서는 효소 생합성이 왕성하였으나, glucose와 같은 단당류에서는 효소가 전혀 유도되지 않았는데, 이 두 균주는 carbon catabolote repression을 받고 있었다. 2-deoxy glucose는 야생주에서는 강력한 repressor로 작용하였고, 야생주의 catabolite repression을 해제 시키는데 antimetabolite로 작용한다는 것이 밝혀졌다. NTG(500㎍/㎖, 50℃, 20∼60분)와 UV(2분) 처리후 2-DG(20mM)에 직접배양하여 강력한 catabolite repression resistant strain인 M-211과 M-367을 분리하였다. M-211과 M-367은 2-DG를 energy원으로 이용하였으며, glucose에 대하여 CMCase는 1.5%, avicelase 및 xylanase는 약 1.0%까지 저항성을 보였다. 또한 두개의 변이주의 효소 활성은 CMCase 2배, avicelase 1.5배 및 xylanase3배의 증가를 보였으며, 각 효소생합성을 위한 gene expression은 cAMP-independent transcription을 하는 것으로 나타났다. Cellulase and xylanase synthesis of thermophilic alkalophilic Bacillus sp. F204 and F1020 isolated in our lab, were repressed by glucose and induced by compounds structurally related to α-1,4 linkage (avicel cellulose and xylan et. al.). Catabolite repression-resistant mutants were obtained through treatment of NTG(500㎍./㎖), UV(2 min) and enrichment culture in 2-deoxy glucose (20 mM) containing PY-glucose on the wild type strain. T재 catabolite repression resistant mutants were not repressed by glucose and produced cellulase complex and xylansase when in grown in the presence of 1.0% glucose and 30mM 2-DC, which were repressors in wild type. Enzyme production was greater with the mutants (CMCase of 2 times, avicelase of 1.5 times, xylanase of 3 times) than with the wild type strains under various test conditions. T재 mutants M-211 and M-367 were potential catabolite repression resistant mutants and their gene expression was cAMP independent transcription.
( Sung-bin Chon ),( Sang Do Shin ),( Sang Hoon Na ),( Youngsuk Cho ),( Hwan Suk Jung ),( Jun Hyeok Choi ),( Gyu Chong Cho ),( Kap Su Han ),( Taehwan Cho ),( Sung-woo Lee ),( Yong Joo Park ) 대한응급의학회 2017 대한응급의학회지 Vol.28 No.1
Purpose: Sudden cardiac arrest (SCA) accounts for approximately 15% of all-cause mortality in the US and 50% of all cardiovascular mortalities in developed countries; 10% of cases have an underlying structural cardiac abnormality. An echocardiography has widely been used to evaluate cardiac abnormality, but it needs to be performed by emergency physicians available in the emergency department immediately after death, rather than by cardiologists. We aimed to determine whether post-mortem echocardiography (PME) performed in the emergency department may reveal such abnormalities. Methods: We evaluated the reliability and validity of PME performed by emergency physicians in the emergency department. Measurement by a cardiologist was used as reference. Results: Two emergency physicians performed PME on 3 out of the 4 included patients who died after unsuccessful cardiopulmonary resuscitation. PME was started within 10 minutes of death, and it took 10 minutes to complete. Parasternal views in either supine or left decubitus position were most helpful. The adequacy of the image was rated good to fair, and that of measurements was acceptable to borderline. Regarding the chamber size and left ventricular wall thickness, intraclass correlation coefficients for reliability and validity were 0.97 (n=15) and 0.95 (n=35), respectively (p<0.001). Evaluation of presence/absence of left ventricular wall thinning, valve calcification, and pericardial effusion was incomplete (3/7-5/7), precluding further analysis. Conclusion: Emergency physicians could perform reliable and valid PME to assess the chamber size and left ventricular wall thickness. A large prospective study with collaboration between emergency physicians and cardiologists would reveal the feasibility and usefulness of PME in diagnosing structural causes of sudden cardiac arrest.
난소암 환자의 난소낭종액 단백의 분리와 성상에 대한 연구
최갑규,이상훈,고재경,김두상 한양대학교 의과대학 1990 한양의대 학술지 Vol.10 No.2
In order to investigate the nature of proteins in cystic fluid of ovary in patients with ovarian cancer, proteins in teh cystic fluid of serous and mucinous cystadenocarcinoma were isolated and fractionated by a high performance liquid chromatoraphy (HPLC) and DEAE-cellulose column chromatography, and teh results were compared with those obtained from the cystic fluid proteins in serous cyst, a simple ovarian cyst. 1. Protein concentration in the cystic fluid of serous and mucinous cystadenocarcinoma was unchanged as compared with that of serous cyst. 2. Proteins in teh cystic fluid were isolated by a HPLC into 3 peaks each in serous cyst and mucinous cystadenocarcinoma and 4 peaks in serous cystadenoarcinoma. 3. Proteins in the cystic fluid were isolated by a DEAE-cellulose column chromatography into 5 peaks each in serous cyst and mucinous cystadenocarcinoma and 6 peaks in serous cystadenocarcinoma. These results indicated that proteins specific to serous cystadenocarcinoma were present, which could be used as a biochemical marker for the ovarian cancer.
Preservation of Some Partial Ordering under Formation of k-out-of-n Systems of Like components
Sang Lyong Kim,Jeen Kap Choi 한국데이터정보과학회 1995 한국데이터정보과학회지 Vol.6 No.1
In this paper, we shall convey preservation of some partial orderings and closures of some positive ageing classes under k-out-of-n systems of like components. That is, if the life time of a component A is larger than that of a component B in any of the NBU, DMRL, WBUE, HNBUE, NBUFR and NBUFRA orderings, then a k-out-of-n system formed by i.i.d. components of type A has larger life time, in that ordering, than that of a similar system consisting of n i.i.d. components type of B. And using these partial orderings, closures of positive aging classes(NBU, DMRL, NBUE, HNBUE, NBUFR and NBUFRA) under the coherent system like components.
COMPONENT-BASED DEVELOPMENT OF OBSERVATIONAL SOFTWARE FOR KASI SOLAR IMAGING SPECTROGRAPH
Choi, Seong-Hwan,Kim, Yeon-Han,Moon, Yong-Jae,Choi, Kyung-Seok,Park, Young-Deuk,Jang, Bi-Ho,Kim, Su-Jin,Kim, Kap-Sung The Korean Astronomical Society 2005 Journal of The Korean Astronomical Society Vol.38 No.4
In this paper, we have made the component-based development of observational software for KASI solar imaging spectrograph (KSIS) that is able to obtain three-dimensional imaging spectrograms by using a scanning mirror in front of the spectrograph slit. Since 2002, the KASI solar spectrograph has been successfully operated to observe solar spectra for a given slit region as well as to inspect the response functions of narrow band filters. To improve its capability, we have developed the KSIS that can perform sequential observations of solar spectra by simultaneously controlling the scanning mirror and the CCD camera via Visual C++. Main task of this paper is to introduce the development of the component-based software for KSIS. Each component of the software is reusable on the level of executable file instead of source code because the software was developed by using CBD (component-based development) methodology. The main advantage of such a component-based software is that key components such as image processing component and display component can be applied to other similar observational software without any modifications. Using this software, we have successfully obtained solar imaging spectra of an active region (AR 10708) including a small sunspot. Finally, we present solar $H{\alpha}$ spectra ($6562.81{\AA}$) that were obtained at an active region and a quiet region in order to confirm the validity of the developed KSIS and its software.
Some Partial Orders Describing Positive Aging
Choi, Jeen-Kap,Kim, Sang-Lyong Korean Data and Information Science Society 1996 한국데이터정보과학회지 Vol.7 No.1
The concepy of positive aging describles the adverse effects of age on the lifetime of units. Various aspects of this concepts are described in terms of conditional probability distribution of residual life times, failure rates, equilibrium distributions, etc. In this paper we will consider some partial ordering relations of life distribution under residual life functions and equilibrium distributions.