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Streptomyces sp. YB-9가 생산하는 균체외 ${\beta}-galactosidase$의 특성
이경섭,김창진,윤기홍,Lee, Kyung-Seop,Kim, Chang-Jin,Yoon, Ki-Hong 한국응용생명화학회 2003 한국농화학회지 Vol.46 No.4
토양으로부터 lactose의 가수분해를 촉매하는 균체외 ${\beta}-galactosidase$를 생산하는 YB-9가 분리되었다. 분리균 YB-9는 분리균의 배양, 형태, 생리적 특성을 조사한 결과 Streptomyces속 균주로 동정되었다. 분리균의 배양상등액을 ammonium $sulfate(15{\sim}70%)$로 처리하고 투석하여 부분정제된 ${\beta}-galactosidase$를 $para-nitrophenyl-{\beta}-D-galactopyranoside(pNP-{\beta}Gal)$와 lactose를 기질로 하여 반응특성을 분석하기 위해 조효소액으로 사용하였다. ${\beta}-Galactosidase$는 pH $6.0{\sim}6.5$와 $60^{\circ}C$에서 최대활성을 보였다. $pNP-{\beta}Gal$과 lactose에 대한 ${\beta}$-galactosidase의 가수분해 활성은 galactose에 의해 감소되었다. Lactose에 대한 가수분해 활성은 glucose에 의해 미미하게 감소하였으나, glucose에 의해 $pNP-{\beta}Gal$에 대한 활성은 1.3배 증가하였다. 특히, xylose에 의한 lactose의 가수분해 활성에는 영향이 없었고, $pNP-{\beta}Gal$에 대한 활성은 1.6배 증가시켰다. A strain YB-9 was isolated from soil as a producer of the extracellular ${\beta}-D-galactosidase$, which catalyzes the hydrolysis of lactose. The strain YB-9 was identified as Streptomyces sp. on the basis of its cultural, morphological and physiological properties. After treating culture supematant of the isolate with ammonium sulfate $(15{\sim}70%)$, the precipitated protein was used as a crude ${\beta}-galactosidase$ for analyzing its reaction properties with $para-nitrophenyl-{\beta}-D-galactoside$ $(pNP-{\beta}Gal)$ and lactose as substrates. The {\beta}-galactosidase showed its maximal activity at pH $6.0{\sim}6.5$ and $60^{\circ}C$. The hydrolyzing activity of ${\beta}-galactosidase$ for both $pNP-{\beta}Gal$ and lactose was decreased by galactose. Its hydrolyzing activity for lactose was slightly decreased by glucose, but the activity for $pNP-{\beta}Gal$ was increased to 1.3-folds by glucose. Especially, its hydrolyzing activity was not affected for lactose and was increased to 1.6-folds for $pNP-{\beta}Gal$ by xylose.
신손상 환자에서 신적출술을 시행받은 환자의 임상적 양상
이경섭 ( Kyung Seop Lee ) 대한외상학회 2003 大韓外傷學會誌 Vol.16 No.2
Background: To evaluate retrospectively an clinical manifestation on cases of renal injury with nephrectomy, we reviewed our experiences with acutely renal-injured patient. Methods: The outcomes of treatments of 20 patients who had been managed by nephrectomy after renal injury were reviewed retrospectively with respect to age, sex, cause, clinical manifestations, physical examination, degree of renal injury (grade Ⅰ-Ⅴ), radiologic findings, injuries of other organ, complication and follow-up examinations. Results: Twenty patients with renal injuries who had undergone an explolaparotomy were identified. Seventeen (17) patients survived, but the and other three (3) patients died. The most common cause was motor-vehicle accidents (16 cases 80.0%). Clinical manifestations were flank pain in (14 cases 70.0%), drowsy mentality in (4 cases 20.0%), and gross hematuria in (1 case, 5.0%). Associated injuries were seen in 17 cases (85.0%). The most common associated injury was pneumothorax in 7 cases (18.9%). The causes of nephrectomy were a shattered kidney in 10 cases, hemodynamicinstability status in 6 cases, renal pedicle injury in 1 case, generalized peritonitis in 2 cases and urinoma formation in 1 case. Conclusion: Patients who undergo trauma nephrectomy tend to be severely injuried, and hemodynamicinstability was a major indication of nephrectomy.
On-Line 및 Off-Line 상태에 따른 누설 전류 진단 분석
한경철,이경섭,최용성,Han, Kyung-Chul,Lee, Gyeong-Seop,Choi, Yong-Sung 한국전기전자재료학회 2018 전기전자재료학회논문지 Vol.31 No.4
When the clamp meter approaches the electric path where current is flowing, leakage current can be measured at a distance from the electric current because the induced current increases as the magnitude of the current increases and approaches nearer to the electric path. Therefore, measurements were carried out from a distance to avoid this effect. In addition, the measured values differ depending on the location of the power line that penetrates the ZCT of the clamp meter, thus measurements were performed at a location where this effect was minimized. The fraction of compliant branch circuits, whose leakage current was lower than 1.00 mA, was found to be 69.0% out of the total of 439 branch circuits, while the percentage of compliant branch circuits having an insulation resistance higher than $0.20M{\Omega}$ was found to be 93.2%. The reason why the percentage of compliant branch circuits with low leakage current was low might be due to the inclusion of capacitive leakage current in the total measured leakage current.
Se Yun Kwon(권세윤),Kyung Seop Lee(이경섭) 대한비뇨기종양학회 2020 대한비뇨기종양학회지 Vol.18 No.1
Purpose: We compared retropubic radical prostatectomy (RRP) with various laparoscopic radical prostatectomy procedures with RRP as previous performed in our institution. Materials and Methods: Demographics, perioperative and functional outcomes of 78 patients that underwent modified RRP (mRP; N=53) or established RRP (eRP; N=25) at our institution from January 2013 to December 2018 were evaluated retrospectively. Postoperative incontinence and erectile dysfunction are involved functional outcomes. During the modified procedure, with preserving endopelvic fascia, the prostate was dissected in an antegrade fashion with bilateral nerve sparing, and then urethrovesical anastomosis was performed with continuous suture. Results: The mean age was older in mRP (68.7±5.3 years) than mRP (65.9±5.0 years) and mean prostate volume was larger in mRP (40.1±18.6 mL) than eRP (30.4±14.0 mL). Mean operative time was longer in eRP (227.0±111.1 minutes) than mRP (154.6±31.6 minutes) and estimated blood loss and complicate rate were similar in 2 groups. The pathologic stage was all T2 stage in eRP, however, in mRP T2 stage was 31 and T3 stage was 22. The pathologic Gleason score was higher in mRP than eRP (p=0.001). Positive surgical margin was significantly higher in mRP, however, biochemical recurrence was insignificantly higher in mRP. Incontinence rates at 3 and 12 months after eRP decreased from 96.0% to 28.0% and after mRP decreased from 49.1% to 7.5%. Overall postoperative potency rate at 12 months was significant different in eRP and mRP groups (8.0% and 34.0%). Conclusions: The mRP was found to have favorable functional outcome and short operative time. This technique might be adopted by inexperienced urologic surgeons as a standard procedure.