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손창식,권강범,김상범,이호승,서은아,이호섭,류도곤 대한동의병리학회 2001 동의생리병리학회지 Vol.15 No.2
In order to elucidate toxic mechanism of myocardial damage and protective effect of herbal extract, Dansamyeum (丹參飮) against cytotoxic effect of xanthine oxidase/hypoxanthine(XO/HX) and cardioprotective effect of Dansamyeum (丹參飮) were examined by MTT assay and heart beating rate after cultured myocardial cells derived from neonatal mouse were treated with various concentrations of XO/HX, a free radical. The results of these experiments were fellows : XO/HX, a oxygen radical, decreased the survial rate on MTT assay in cultured myocardial cells. Dansmyeum(丹參欲) water extract have efficacy of increasing heart beating rate decreased by XO/HX in cultured myocardial cells. Radix Salviae Miltiorrhizae and Lignum Santali Album water extract have efficacy of increasing heart beating rate decreased by XO/HX in cultured myocardial cells. From above the results, it is suggested that XO/HX showed toxic effect in cultured myocardial cell derived from neonatal mouse and herbal extract such as Dansamyeum(丹參飮) is very effective in the prevetion of XO/HX cardiotoxicity. Key ward : Dansamyeum(丹參飮), Xanthine Oxidase/Hypoxanthine(XO/HX), myocardial Cell, Radix Salviae Miltiorrhizae, Lignum Santali Album, MTT, beating rate
Alcaligenes latus의 배양방법에 따른 생분해성 플라스틱의 생산특성
박성연,조강현,최희식,류희욱,조경숙 이화여자대학교 환경문제연구소 1998 이화환경연구 Vol.2 No.-
생장과 동시에 poly(3-hydroxybutyrate, PHB) 를 체내에 축적하고, 값싼 당류인 sucrose를 이용할 수 있는 Alcaligenes latus의 생장과 PHB 생산을 최적화 할 수 있는 배양 조건에 대하여 연구하였다. 균주 생장과 PHB 생산성에 미치는 sucrose의 초기농도의 영향을 5L 발효조를 이용하여 회분식 배양 방법에 의해 조사하였다. PHB생산성은 sucrose농도가 10g/L에서 30g/L로 증가함에 따라 0.11에서 0.36g-PHB/L·h까지 증가하였고, 그 이상의 농도에서는 큰 변화없이 0.36∼0.39g-PHB/L·h에서 일정하게 유지되었다. 균주의 비증식속도는 sucrose 농도 증가함에 따라 증가하여 30g/L에서 최대값 0.44h()을 보였으며, sucrose의 농도가 30g/L을 초과하면 균주의 생장은 기질에 의해 저해 받았다. A. latus를 이용하여 대량으로 PHB를 생산하기 위해 유가식 배양과 반연속 유가식 배양을 수행하였다. 인산염 제한하에서 유가식 배양에 의해 얻은 PHB 생산성은 1.14g-PHB/L·h로, 인산염 제한없는 조건에서 얻은 PHB생산성(2.10g-PHB/L·h)에 비해서 훨씬 작았다. PHB함량은 영양소 제한에 관계없이 55∼60%이었다. 영양소 제한 없이 반연속 유가식 배양법에 의해 PHB생산성을 4.5∼4.8g-PHB/L·h까지 향상시킬 수 있었다. 평균 PHB 함량, 소비된 sucrose당 건조 균체중량 수율 및 PHB 생산 수율은 각각 60%, 0.48 및 0.32이었다. 그러므로, 생장과 동시에 PHB를 축적할 수 있는 A. latus를 이용하여 PHB를 생산할 경우, 반연속 유가식 배양법은 높은 PHB생산성을 얻을 수 있는 유망한 배양법임을 알 수 있다. Optimum conditions for cell growth and poly(3-hydroxybutyrate, PHB) biosynthesis of Alcaligenes latus, which can accumulate PHB simultaneously in associated with cell growth and grows well on a cheap carbon source such as sucrose, were investigated. The effect of initial sucrose concentration, ranged from 10 to 50g/L, on the cell growth and PHB accumulation were studied by a batch culture in a 5L fermentor. PHB productivity was increased from 0.11 to 0.36g-PHB/L·h with increasing sucrose concentration up to 30g/L, and it was fairly constant between concentrations of 30g/L and 50g/L. The maximum specific growth rate, 0.44h(), was obtained at 30g-sucrose/L, and the growth was inhibited at concentrations of sucrose over 30g/L. A. latus was also cultivated to attain high PHB productivity by fed-batch or semicontinuous fed-batch culture techniques. PHB productivity by a fed-batch culture under phosphate limitation(1.14g-PHB/L·h) were smaller than that without nutrient limitation(2.10g-PHB/L·h). but there is no significant difference of PHB content(55∼60%) obtained in both culture. By a semicontinuous fed-batch culture without nutrient limitation, high PHB productivity could be obtained as 4.5∼4.8g-PHB/L·h. The average PHB content, the yield of dry cell weight, and the yield of per consumed sucrose were 60%, 0.48, and 0.32, respectively. These results suggest that the semicontinuous fed-batch culture technique is one of promising methods to achieve high PHB productivity by A. latus.
탈착용 종아리 압박 기구 착용이 여자 대학생들의 등속성 운동 시 하지 근기능에 미치는 영향
류종식(Ryu, Jong-Sik),김차룡(Kim, Cha-Ryong),송남석(Song, Nam-Seok),김상영(Kim, Sang-Yeong),황강민(Hwang, Kang-Min),채원식(Chae, Won-Sik),김종근(Kim, Jong-Geun) 한국체육과학회 2018 한국체육과학회지 Vol.27 No.6
The purpose of this study was to investigate the effect of muscular strength and muscle endurance on the isometric and isokinetic muscular strength of calf compression equipment. The subjects were selected among 18 college students who had no ankle related disorder among 20 subjects. All subjects measured ROM, maximum torque (Peak Torque), and total work of the ankle according to the presence or absence of the compression mechanism. Muscle strength test showed that the peak torque(Nm). Dorsi flexion was 33.41 ± 4.35Nm, 34.66 ± 4.45Nm, and plantar flexion was 120.94 ± 42.24Nm at the lower flexion, respectively, which was not significantly different from 123.97 ± 31.5Nm. Muscle endurance test showed that the total work(Nm). dorsi flexion was lowered from 82.22 ± 8.03Nm to 80.27 ± 7.93Nm, but there was no significant difference. On the other hand, plantar flexion was 237.05 ± 93.64 Nm and 255.94 ± 84.23 Nm, respectively (p<.05). These results suggest that wearing a calf compression equipment and dorsiflexion and flexion exercises will increase the range of static joint motion and improve strength and muscle endurance. In order to improve the ankle joint"s muscular function, Exercise seems to have a positive effect.
Effect of A Sinusoidal Field in a Switching Magnet for a Proton Beam Accelerator
Heung-Sik Kang,Chun-Kil Ryu,이희석,Hong-Gi Lee,Hong-Sik Han,Hyung-Seok Suh,Jinhyuk Choi,Ki-Hyeon Park,MunGyung Kim,Seong-Hun Jeong,Tae-Yeon Lee,Young-Gyu Jung 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.4
The 100-MeV Proton Engineering Frontier Project (PEFP) proton linac will provide two proton beam extraction lines at the 20-MeV and the 100-MeV end for users’ experiments. Each extraction line will be branched to 5 beamlines. To distribute the proton beam to each beamline, a switching magnet will be used. A conventional resonant AC-type power supply for the switching magnet, which supplies a current with a sinusoidal variation, causes some problems of sinusoidal field variation during the beam pulse duration and of magnet hysteresis. The effect of sinusoidal field variation is analyzed with the TRACE code by using the equivalent Twiss parameters. The effect of the magnet hysteresis is also described, and its solution is proposed.8消