• 대한수의학회지
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• 제37권2호
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• pp.439-443
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• 1997

동경에서 시판되고 있는 애완견 및 고양이의 식품을 시료로 하여 그 영양성분을 분석한 바, 애완견의 건조식품의 경우 단백질 22.0%, 지방 7.8%, 섬유질 5.4%, 염분 0.36%, 비타민 A 2035 IU/100g 그리고 비타민 D가 201 IU/100g 함유되고 있었고, 고양이용 식품중에는 단백질 29.8%, 지방 6.5%, 섬유질 4.5%, 염분 0.38%, 비타민 A 1543 IU/100g 그리고 비타민 D가 163 IU/100g 함유되고 있었다. 불포화지방산의 경우 애완견의 건조식품에선 59.2% 함유되어 있었고, 고양이용 건조식품에선 55.9%로서 애완견용 식품이 약간 높았으나 양측간에는 유의한 차이는 아니었다. 한편 애완견의 건조식품을 대상으로 30일간 저장시험을 통하여 지질과산화물의 농도변화를 관찰한 바 냉장($4^{\circ}C$)과 암실내 저장($20{\pm}2^{\circ}C$)에서는 별로 변화가 없었으나, 태양광선($20{\pm}2^{\circ}C$)에 노출시 5일후에는 실험개시에 비하여 4.9배(p<0.01) 그리고 30일에는 10.2배가 증가된(p<0.01) 73.6nmol/g에 달하였다. 이와같은 결과를 미루어 보아 애완동물용 식품의 안전성을 위한 저장은 반듯이 냉장이나 암실보관할 것을 제안한다.

• Bulletin of the Korean Chemical Society
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• 제35권1호
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• pp.111-116
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• 2014

The kinetics and mechanism of oxidation of sulfanilic acid by N-chloro-p-toluene sulfonamide (chloramine-T) have been studied in acid medium. The species of chloramine-T were analysed on the basis of experimental observations and predominantly reactive species was taken into account for proposition of most plausible reaction mechanism. The derived rate law (1) conforms to such a mechanism. $$-\frac{d[CAT]}{dt}=\frac{kK_1[RNHCl][SA]}{K_1+[H^+]}$$ (1) All kinetic parameters were evaluated. Activation parameters such as energy and entropy of activation were calculated to be $(61.67{\pm}0.47)kJmol^{-1}$ and $(-62.71{\pm}2.48)kJmol^{-1}$ respectively employing Eyring equation.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 하계학술대회 논문집 C
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• pp.1685-1686
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• 2000

Crack-free and homogeneous com ceramic and epitaxial lead zirconate titanat ferroelectric thin films with perovskite structure been prepared by sol-gel processing. Ti-isoprop and lead acetate trihydrate and zirconium-pro are used raw materials. EAcAc is used as a cat 2-Methoky ethanol is used as a solvent annealing temperatures of the thin films are 0$^{\circ}C$.

• 대한예방한의학회지
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• 제7권2호
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• pp.85-96
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• 2003

Objectives : In order to examine the antioxidant activities of Kyungohkgo(瓊玉膏), the study was done through measurement of parameters such as Thiobarbituric acid reactive substance(TBARS), Superoxide dismutase(SOD), Catalase(CAT), Glutathione peroxidase(GSH-px), Plasma total lipid, Plasma total triglyceride, Plasma total cholesterol, HDL-cholesterol concentrations in rat erythrocytes and plasma. Methods : Sprague-Dawley rats divided into 3 groups, Normal group(l2 weeks old), pathologically induced group(injected D-galatose 50mg/kg, 1time/day for 6 weeks, CONTROL) and Kyungohkgo(瓊玉膏) administered group(D-galactose 50mg/kg and Kyungohkgo extracts 1125.0mg/kg 1time/day for 6 weeks, KOG). Rats were sacrificed and TBARS, SOD, CAT, Plasma total lipid, Plasma triglyceride, Plasma total cholesterol, Plasma HDL-cholesterol concentrations and GSH-px were measured in rat erythrocytes and plasma. Results : Plasma TBARS concentrations of KOG group were significantly lower than those of control. Red blood cell(RBC) SOD activities of KOG group was increased(F=3.619, p=0.052, ANOVA test), and RBC catalase activities of all experimental group were not significantly different. RBC GSH-px activities of KOG group was increased(F=6.844, p=0.008, ANOVA test). The changes of Plasma triglyceride was not significantly different. Plasma total lipid of KOG group showed significant decrease compared to the control group(F=19.337, p=0.0001, ANOVA test). Plasma total cholesterol and HDL-cholesterol concentrations of all experimental groups were not significantly different. Conclusions : According to the above results, it is considered that Kyungohkgo(瓊玉膏) is effective in inhibiting lipid peroxidation and increasing antioxidative enzyme activities in D-galactose induced aging rat.

• Journal of Microbiology and Biotechnology
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• 제22권3호
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• pp.292-300
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• 2012

We report the expression, purification, and characterization of L-asparaginase (AnsA) from Rhizobium etli. The enzyme was purified to homogeneity in a single-step procedure involving affinity chromatography, and the kinetic parameters $K_m$, $V_{max}$, and $k_{cat}$ for L-asparagine were determined. The enzymatic activity in the presence of a number of substrates and metal ions was investigated. The molecular mass of the enzyme was 47 kDa by SDS-PAGE. The enzyme showed a maximal activity at $50^{\circ}C$, but the optimal temperature of activity was $37^{\circ}C$. It also showed maximal and optimal activities at pH 9.0. The values of $K_m$, $V_{max}$, $k_{cat}$, and $k_{cat}/K_m$ were $8.9{\pm}0.967{\times}10^{-3}$ M, $128{\pm}2.8$ U/mg protein, $106{\pm}2s^{-1}$, and $1.2{\pm}0.105{\times}10^4M^{-1}s^{-1}$, respectively. The L-asparaginase activity was reduced in the presence of $Mn^{2+}$, $Zn^{2+}$, $Ca^{2+}$, and $Mg^{2+}$ metal ions for about 52% to 31%. In addition, we found that $NH_4{^+}$, L-Asp, D-Asn, and ${\beta}$-aspartyl-hydroxamate in the reaction buffer reduced the activity of the enzyme, whereas L-Gln did not modify its enzymatic activity. This is the first report on the expression and characterization of the L-asparaginase (AnsA) from R. etli. Phylogenetic analysis of asparaginases reveals an increasing group of known sequences of the Rhizobial-type asparaginase II family.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2004년도 가을 학술발표논문집 Vol.31 No.2 (1)
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• pp.523-525
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• 2004

플래시 메모리는 저전력 소비, 빠른 읽기 속도, 비휘발성 등 좋은 특징을 많이 가지고 있다. 하지만 반대로 플래시메모리는 치명적인 약점도 가지고 있는데, 그것은 덮어쓰기가 불가능 하다는 것과 삭제속도가 극단적으로 느리다는 것이다. 따라서 이와 같은 치명적인 약점을 극복하기 위한 효율적인 파일시스템과 Carbage Collector(GC)의 설계는 플래시 메모리 연구의 핵심적인 부분이 되어 왔고 JFFS2(Journaling Flash File System version 2)는 그러한 연구의 결과 중 하나이다 본 논문은 기존에 JFFS2에서 사용된 GC와 비교해 좀 더 효율적 인 GC를 제안한다. 성능향상을 위해서 사용된 두 가지 핵심적인 알고리즘은 Cost Age Times (CAT 방법과 Dynamic dAta Clustering (DAC) 방법이며, 결과적으로 지역성(Locality)이 높은 데이터의 쓰기에서 최고 3배 정도의 성능향상을 보였다.

• 대한예방한의학회지
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• 제8권2호
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• pp.65-80
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• 2004

Objectives : CRATAEGII FRUCTUS(山査) is known as the substance which delays aging by the antioxidant effects. The purpose of this study is to investigate the effects of CRATAEGII FRUCTUS(山査) on antioxidant enzyme activities such as Thiobarbituric acid reactive substance(TBARS), Superoxide dismutase(SOD), Catalase(CAT), Glutathione peroxidase (GSH-px) in rat erythrocytes and blood plasma. Methods : Sprague-Dawley rats were divided into 3 groups, Normal group (supplied enough water and feeds only, Normal Group), D-galatose administered group(injected D-galatose 50mg/kg, 1time/day for 6 weeks, Control Group) and CRATAEGII FRUCTUS(山査) administered group (D-galactose 50mg/kg and CRATAEGII FRUCTUS(山査) extracts 85.0mg/200g 1time/day for 6 weeks, SS Group). Rats were sacrificed and TBARS, SOD, CAT, GSH-px, neutral fat and cholesterol were measured in rat erythrocytes and blood plasma. Results : There was no significant difference in the level of TBARS in the blood plasma between each experimental group. Red blood cell SOD activities were significantly different in each group. They were significantly decreased in the Control group compared to those of Normal and there was an increasing phenomenon in the SS group compared to the Control group. There was a significant difference in the activities of the red blood cell - glutathione peroxides in each group. There was a significant increase in the SS group compared to the Control group. Red blood cell catalase activities was no significant difference in each group. Plasma total lipid concentration was significantly different in each group. It was significantly increased in the Control group compared with the Normal group and it was decreasing in the SS group compared to the control group. Plasma triglyceride was not significantly different in each group. Plasma total cholesterol and Plasma HDL -cholesterol concentrations in the blood plasma were not significantly different in each group. Conclusions : According to the above results, it is considered that CRATAEGII FRUCTUS(山査) is effective in inhibiting lipid peroxides and increasing the activities of antioxidative(anti aging) enzyme in D-galactose induced aging rat.

• 생명과학회지
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• 제23권5호
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• pp.657-663
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• 2013

생후 4주령 Sprague Dawley계 수컷 흰쥐를 분양 받아 청국장식이유산소운동군 8마리, 청국장식이군 8마리, 유산소운동군 8마리, 대조군 8마리, 총 32마리를 대상으로 구분하였다. 운동은 6주간, 주 5회, 경사도 0%, 속도 15~16 m/min으로 하고, 1주차 25분, 2~3주차 30분, 4~5주차 35분, 6주차 40분이 되도록 실시하였고, 청국장은 20% 청국장 첨가식이를 1일 20 g 기준으로 섭취시킨 결과는 다음과 같다. 청국장 식이와 유산소 운동은 혈중지질중 T-C, TG, HDL-C에서 긍정적인 효과가 나타났고, 항산화효소 중 SOD에서 긍정적인 효과가 나타났다. 이는 유산소 운동의 혈중지질의 개선, 항산화 효과와 청국장에 함유된 레시틴(lecithin), 사포닌(saponin), 글라이시틴(glycitin), 파이틱산(phytic acid) 등의 성분들의 시너지 작용으로 긍정적인 영향을 미친 것으로 사료된다. 그러나 LDL-C, TBARS, CAT, GPx의 차이는 나타나지 않았다. 차후 연구에서 운동강도, 빈도, 지속시간과 청국장의 섭취량 등에 변화를 준 다각적 연구가 필요할 것으로 사료된다.

• 생명과학회지
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• 제18권12호
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• pp.1739-1744
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• 2008

본 연구는 50 mg/kg의 STZ로 유발된 당뇨쥐에서 단기간 운동과 capsaicin 섭취가 혈중지질, 항산화 효소 및 Akt량에 미치는 영향을 알아보고자 31마리의 흰쥐를 대상으로 실험 하였다. 운동 군과 운동과 capsaicin을 병행한 군에서는 당뇨 유발 일주일 후 부터 15 m/min, 0%의 경사도로 25분간 주5회 2주간 트레드밀 운동을 실시하여 다음과 같은 결과를 얻었다. 혈중 지질 농도는 capsaicin 섭취와 운동을 병행한 군에서 TG는 유의하게 감소하였고, HDL-C는 다른 군에 비해 유의하게 높게 나타났고, ROS는 당뇨군을 제외한 모든 군에서 유의하게 감소하였다. CAT는 capsaicin만 섭취한 군에서 유의하게 증가하였고, SOD은 운동만 처치한 군과 capsaicin만 섭취한 군에서 유의하게 높았으며, GSH는 당뇨군을 제외한 모든 군에서 유의하게 높은 것으로 각각 나타났다. Akt효소는 capsaicin만 섭취한 군, p-Akt는 운동군에서 유의하게 증가하였다.

• 미생물학회지
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• 제21권2호
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• pp.61-70
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• 1983

Synchronized cat kidney cells chronically infected with feline leukemia virus (FeLV) were used to study virus production, the synthesis of group specific antigen (gag) and envelope (env) proteins, the expression of env protein on the cell surface during the cell cycle, and the stability of viral RNA. As detecting method, we developed the radioimmunoassay (RIA) system using beta-emission of $^{131}I$ and demonstrated the validity of this system by comparison with routine RIA system using gamma-emission of $^{125}I$. The produced virus was analysed by developed RIA interval was determined by measuring reverse transcriptase activity. The results show that infected cells produce the complete virus particle containing products of gag, env and pol genes of FeLV, and maximum virus production occurs during mitosis of synchronized cells. Labeling of the cell surface of synchronized cells with $^{131}I$ shows that the amount of $gp70^{env}$ on the cell surface parallels cellular gorwth. Therefore, the cell cycle-dependent release of virus is not petition RIA of synchronized cells with $^{131}I$ labeled viral proteins synthesis during the cell cycle. The rate of synthesis of gag protein shows three peaks, corresponding to the $G_1,\;late\;S\;and\;late\;G_2$ phases of cell cycle. But the rate of synthesis of env protein dose not change, suggesting that in these cells the synthesis of these two gene products in controlled seperately. In Actionomycin D treated cells, the synthesis of viral proteins decreased sharply from 8 hours after treatment, and the late S and $G_2$ peaks of gag protein synthesis were disappeared. This shows the stability of viral RNA for about 6 hours in the absence of continuing viral RNA synthesis.