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동형 모더나이트 상에서 일산화탄소 산화반응에 대한 속도론
정명수,이창용,최고열,하백현 漢陽大學校 環境科學硏究所 1989 環境科學論文集 Vol.10 No.-
모더나이트에 동을 이온교환 및 담지시킨 후 환원·산화 처리를 하여 동의 상태를 변화시킨 촉매에 대해 일산화탄소 산화반응의 속도론적인 고찰을 행하였다. 이온교환 촉매나 담지촉매 모두 동의 상태와는 관계없이 일산화탄소에 관한 반응차수는 1차이고 산소에 관한 반응차수는 0차였다. 이온교환 촉매의 경우는 수소로 환원시켜 동이 금속상태로 존재할때와 이를 재산화시켜 산화동 상태로 존재할때는 활성화에너지가 각각 16.4 및 20.3으로 비교적 큰 값을 나타냈으나 동의 담지촉매의 경우는 동이 금속일 때나 산화물 상태 모두 12∼13kcal/mole로 비슷한 값을 나타냈으며 이온교환 촉매보다 상당히 감소함을 알 수 있었다. 이와 같은 결과는 이온교환 촉매의 경우는 동이 제올라이트내부에 대부분 존재하는 반면, 담지촉매의 경우는 제올라이트 결정 표면에 존재하기 때문에 활성을 증가시키는 것으로 생각된다. Kinetics of oxidation of carbon monoxide over copper mordenite was carried out at the temperature range between 373K-443K in the micro-catalytic reactor. The experimental results indicated that the reaction order, with respect to carbon monoxide and oxygen was first and zero order respectively, regardless of the valence states such as copper metal, copper ion and copper oxide on the mordenite. The activation energy for metal-copper mordenite which is obtained by the ion-exchange revealed 20kcal/mol. But if this was reoxidized under the oxygen it decreased to 16.6kcal/mol. The activation energy of metal-copper mordenite which was obtained by impregnation and its reoxidized one under the oxygen were 12.2kcal/mol and 13.3kcal/mol respectively.
Kho, Minjung,Lee, Jung Eun,Song, Yun-Mi,Lee, Kayoung,Kim, Kyunga,Yang, Sarah,Joung, Hyojee,Sung, Joohon American Society for Clinical Nutrition 2013 The American journal of clinical nutrition Vol.98 No.6
<P><B>Background:</B> Salt is essential in our diet, but excess intake is a well-established risk factor for hypertension. The presence and importance of genetic contributions to salt intake, however, are not well understood.</P><P><B>Objective:</B> The aim of this study was to examine whether a genetic predisposition and an environmental influence exist for sodium intake and salt habit.</P><P><B>Design:</B> In a twin-family cohort, half-day urine samples from 1204 individuals (133 pairs of monozygotic twins, 29 pairs of dizygotic twins, and 880 singletons) were collected to assess 24-h sodium intakes. Daily total sodium intake, sodium density per calorie (Na-D), and salt habit questions were analyzed with adjustment for other epidemiologic characteristics. We calculated heritability (h2) and intraclass correlations to examine the genetic and shared environmental contributions to total sodium intake traits.</P><P><B>Results:</B> The average sodium intake was 208.4 ± 107.0 mmol/d. Men had a higher absolute sodium intake (242.6 ± 117.4 mmol/d), but Na-D did not differ by sex. Moderate genetic influences existed (h2 = 0.31–0.34) for sodium intake and Na-D. We also found that sharing current residence rather than being a family member explained 22% of the variance in Na-D.</P><P><B>Conclusion:</B> Our findings suggest that both genetic predisposition and shared environment contribute to sodium intakes and salt habits alike.</P>
Cryopreservation of Pointhead Flounder (Cleisthenes pinetorum herzensteini) Sperm
Kho, Kang Hee,Kang, Kyoung Ho 한국어류학회 2003 韓國魚類學會誌 Vol.15 No.4
용가지마 정자(Cleisthenes pinetorum herzensteini)를 액체질소를 이용하여 동결 보존하였고, 동결에 따른 정자의 운동성, 생존율 그리고 미세구조의 변화를 조사하였다. 정자의 운동성은 30% 인공해수(ASW)에서 운동성이 억제되었고, 100% 인공해수의 첨가에 의해 운동성이 개시되었다. 동해방지제로는 DMSO와 glycreol를 30% ASW에 최종농도가 5~20% 되도록 첨가하여 사용하였다. 그 결과 10% glycerol을 동해방지제로 하였을 때 정자의 운동성 및 생존율이 가장 높게 나타났으며 동결속도는 분당 20℃씨 - 80℃까지 내렸을 때 가장 보존효과가 높게 나타났다. 동결보존한 정자의 원형질막이 핵에서 분리되는 현상이 관찰되었다. In the present study, attempts were made to cryopreserve sperm of the pointhead flounder (Cleisthenespinetorum herzensteini) in liquid nitrogen to evaluate effects of various cryoprotectants and freezing rates on the motility and survival rate, and to identify the ultrastructural changes of sperm after cryopreservation. Sperm motility was significantly inhibited in 30% artificial seawater (ASW), but was restored entirely after 100% ASW was added again. Two cryoprotectants, dimethyl sulfoxide (DMSO) and glycerol, were added to 30% ASW to formulate the extenders at concentrations between 5% and 20% by volume for freezing. The highest post-thawed sperm motility and survival rate were obtained with 10% glycerol. Afterward, the effect of different freezing rates was examined using 10% glycerol as a cryoprotectant, and the rate of 20℃/min to -80℃ showed the best result. Ultrastructural changes of the detachment of plasma membranes were observed after cryopreservation.
Kho, Dohng-Hyo,Lee, Jeong-Kug The Korean Society for Microbiology and Biotechnol 1997 Journal of microbiology and biotechnology Vol.7 No.5
A transposon Tn5 mutant of Rhodobacter sphaeroides 2.4.1 was isolated for its impaired ability of growth on minimal medium containing ${\beta}$-hydroxybutyric acid as a sole carbon source. The mutant, R. sphaeroides S7 showed approximately 6-fold decrease in ${\beta}$-hydroxybutyrate dehydrogenase activity compared with that of wild type. In R. sphaeroides S7 the Tn5 was located in DNA region corresponding to a 4.2-kb EcoRI DNA fragment of R. sphaeroides 2.4.1 chromosome.
고승영,고종섭,전종수 明知大學校 産業技術硏究所 1999 産業技術硏究所論文集 Vol.18 No.-
This study is to develop for the headway scheduling of bus and to deal with the efficient management of bus, Traffic problems of a large city are major social problems in many developed countries as well as Korea. They have made efforts to solve problems by developing and introducing ITS(ITS: Intelligent Transport System) technology. APTS(APTS: Advanced Public Transportation Systems) is a subsystem of ITS. It is to present users travel informations and to increase the efficiency by improving the operation and management of a vehicle. This study, that can be a part of APTS, makes use o the skill of AVL(AVL: Automatic Vehicle Location). If, by real time, we could know the condition of vehicle traveling condition and we could manage the vehicle scheduling, it can give constant level of service to users. And also, this study presented the way of the vehicle management more efficiently by developing the dispatch headway scheduling and real time scheduling model.
KHO, Yoonjung,KIM, Sungchan,YOON, Byung Sun,MOON, Jai-Hee,KIM, Bona,KWAK, Sungwook,WOO, Junghee,OH, Sejong,HONG, Kichang,KIM, Saehun,KIM, Hyunggee,YOU, Seungkwon,CHOI, Yunjaie Japan Society for Bioscience, Biotechnology, and A 2008 Bioscience, Biotechnology, and Biochemistry Vol.72 No.1
<P>In this study, we examined the expression and functions of serum amyloid A (SAA) isoforms during apoptosis of HC11 mammary gland epithelial cells. Expression of SAA mRNAs and apoptosis were increased in HC11 cells by serum withdrawal and gradually decreased upon the addition of serum, or epidermal growth factor (EGF). TNFα treatment of HC11 cells also induced expression of SAA genes, and the effect on SAA1 and SAA2 expression was suppressed by treatment with MG132, and in cells transfected with a dominant negative mutant form of IκBα. Similar results were observed in response to interleukin-1 (IL-1), IL-6 and interferon γ (IFNγ). Furthermore, overexpression of the SAA1 and SAA2 isoforms suppressed growth and accelerated apoptosis of HC11 cells by increasing caspase 3/7 and caspase 8 activities, but the apoptotic effect of tumor necrosis factor α (TNFα) on HC11 cells was not enhanced. We found that expression of <I>SAA1</I> and <I>SAA2</I>, but not <I>SAA3</I>, was regulated by an NFκB-dependent pathway, and that overexpression of SAA isoforms accelerated the apoptosis of HC11 cells.</P>
Kho, Y.S.,Vikineswary, S.,Abdullah, Noorlidah,Kuppusamy, U.R.,Oh, H.I. The Korean Society of Food Science and Nutrition 2009 Journal of medicinal food Vol.12 No.1
Auricularia auricula-judae is currently grown in Malaysia. In the present study, the methanolic extracts from fruit bodies (fresh, oven-dried, and freeze-dried) and mycelium of A. auricula-judae were evaluated for their antioxidant capacities based on 1,1-diphenyl-2-picrylhydrazyl (DPPH) free radical scavenging activity and ferric reducing antioxidant power (FRAP) assay. The total phenolic content in the extracts were also measured. The extract of freeze-dried fruit bodies of A. auricula-judae had potent DPPH free radical scavenging activity with a 50% effective concentration of 2.87 mg/mL, whereas the FRAP value of A. auricula-judae mycelium was $5.22\;{\mu}mol$ of $FeSO_4{\cdot}7H_2O$ equivalents/g of mycelium sample. Further, a positive correlation ($R^2\;=\0.7668$) between FRAP level of A. auricula-judae extracts and the total phenolic contents was observed. Thus the method of processing of fresh fruit bodies had an effect on the antioxidant potential of A. auricula-judae.