• 제목/요약/키워드: P600

검색결과 1,714건 처리시간 0.028초

대장균 xylA 프로모터를 이용한 xylose 유도성 발현벡터의 구축 (Construction of Xylose-Inducible Expression Vector Using xylA Promoter of Escherichia coli)

  • 김현호;소재현;이인구
    • Journal of Applied Biological Chemistry
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    • 제53권1호
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    • pp.1-7
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    • 2010
  • xylA 프로모터는 대장균의 xylose 대사에 관여하는 xylose 오페론 상의 중요한 프로모터이다. 이 프로모터는 xylose에 의해 강하게 조절을 받는다고 알려져 있다. 이러한 특징은 새로운 발현 백터를 구축하는데 충분한 조건을 갖추고 있다고 생각된다. 본 연구에서는 이러한 xylose에 의해 유도 되는 발현벡터를 구축하기 위하여 600 bp의 xylA 프로모터를 증폭하여 pUC18의 AatII와 HindIII 사이에 삽입하여 pXA600을 구축하였다. 또한 조절단백질인 XylR의 영향을 조사하기 위하여 xylR 유전자를 삽입하여 pXAR600을 구축하였다. 발현의 강도를 측정하기 위하여 3,048 bp의 lacZ유전자를 xylA 프로모터의 하류에 연결하여 pXA600-lacZ와 pXAR600-lacZ를 구축하고 대장균 JM109에 형질전환시켰다. 구축된 pXA600-lacZ와 pXAR600-lacZ는 LB 배지에서 배양하였을 때 xylose 유도하에서 각각 1,641 unit와 2,304 unit의 $\beta$-galactosidase 활성을 보였으며, DM 배지상에서 배양했을 때 xylose 유도 시 각각 6,282 unit와 9,320 unit의 $\beta$-galactosidase 활성을 보였다. 또한 왜래 유전자의 발현 가능성을 확인하기 위하여 S. thermocyaneoviolaceus의 내열성 xylanase를 코딩하는 xynA 유전자를 실제로 구축된 pXA600과 pXAR600에서 발현을 확인하여 pXA600 및 pXAR600이 새로운 xylose 유도성 발현벡터로서의 사용 가능성을 확인하였다.

Development of ETRI satellite simulator-ARTSS

  • Kang, J.Y.;Lee, S.;Hong, K.Y.;Shin, K.K.;Rhee, S.W.;Choi, W.S.;Oh, H.S.;Kim, J.M.;Chung, S.J.
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 1994년도 Proceedings of the Korea Automatic Control Conference, 9th (KACC) ; Taejeon, Korea; 17-20 Oct. 1994
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    • pp.49-53
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    • 1994
  • Advanced Real-Time Satellite Simulator(ARTSS) has been developed to support the telemetry, tracking and command operations of the ETRI satellite control system and to provide satellite engineers a more powerful and informative satellite simulations tool on the desktop. To provide extensive simulation functions for a communication satellite system in the pre-operational and operational missions, ARTSS uses a geosynchronous orbit(GEO) satellite model consisting of the attitude and orbit control subsystem, the power subsystem, the thermal subsystem, the telemetry, command and ranging subsystem, and the communications payload subsystem. In this paper, the system features and functions are presented and the satellite subsystem models are explained in detail.

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고온 처리된 납석을 흡착제로 이용한 용액상의 불소 제거 (Fluoride Removal from Aqueous Solution Using Thermally Treated Pyrophyllite as Adsorbent)

  • 김재현;송양민;김성배
    • 대한환경공학회지
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    • 제35권2호
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    • pp.131-136
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    • 2013
  • 본 연구의 목적은 고온 처리된 납석을 흡착제로 이용하여 불소 제거를 연구하는 것이었다. 본 연구에서는 흡착제양, 반응시간, 초기불소농도 그리고 용액pH가 불소제거에 미치는 영향을 관찰하기 위하여 회분조건에서 흡착실험을 수행하였다. 실험에는 다양한 온도에서 열처리한 납석[무처리 (P-U), $400^{\circ}C$ (P-400), $600^{\circ}C$ (P-600)]을 사용하였다. 실험결과, 불소흡착능은 P-400 > P-U > P-600 순으로 나타났다. XRD 분석결과, P-U와 P-400은 석영, 디카이트, 엽납석으로 구성된 반면, P-600은 석영으로만 구성된 것으로 나타났다. BET 분석결과, 비표면적은 P-600 > P-400 > P-U 순으로 나타났다. 동역학적 실험결과, P-400에서의 불소흡착은 24시간 이내에 평형에 도달하였다. 평형흡착 실험결과, P-400의 최대 불소흡착능은 0.957 mg/g이었다. 또한, P-400에 의한 불소제거는 pH 4-10범위에서 용액 pH의 영향을 받지 않았지만, 강산성(pH < 4)과 강염기성(pH > 10) 조건에서는 불소제거가 크게 감소하였다. 본 연구에 의하면, 납석은 저가 흡착제로써 수용액상의 불소제거에 이용될 수 있을 것으로 판단된다.

분자량을 달리한 Chitosan 침지처리가 한우육의 저온저장 중 품질에 미치는 영향 (Effects of Chitosan Dipping Treatments with Different Molecular Weights on the Meat Quality of Hanwoo(Korean Cattle) Beef during Refrigerated Storage)

  • 김용선;양성운;김혜정;이성기
    • 한국축산식품학회지
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    • 제24권1호
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    • pp.1-7
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    • 2004
  • 분자량을 달리한 chitosan 침지처리가 한우육의 저온저장 중 품질특성에 미치는 영향을 조사하였다. 150 kDa과 600kDa의 분자량을 갖는 chitosan을 1% acetic acid에 0.5%씩을 용해하고 pH를 5.5로 조정한 후 한우육의 우둔부위를 5분간 침지시킨 후 $1^{\circ}C$에서 저장하면서 실험하였다. 실험결과, pH는 chitosan(600 kDa) 처리구가 다른 처리구들에 비해 유의적으로 높은 값을 나타내었다(p<0.05). 명도(L*)는 저장 3일까지는 chitosan(600 kDa) 처리구가 유의적으로 높은 값을 보였으나, 6일 이후부터는 처리구간에 유의적인 차이를 보이지 않았다(p>0.05). 적색도의 경우는 저장 전에는 처리구간에 유의적인 차이를 보이지 않았으나 12일 저장시에는 chitosan(150 kDa) 처리구에서 유의적으로 높은 적색도를 보이는 것으로 나타났다. 또한 chitosan(600 kDa)처리구에서 저장 시 표면에 생성되는 metmyoglobin(%)의 함량은 유의적으로 낮은 함량을 나타내었다(p<0.05). 또한 저장기간을 결정할 수 있는 육표면에서의 총균수 실험결과는 저장 전에는 chitosan(600 kDa)처리구가 가장 낮은 총균수를 보였으나 저장기간이 증가함에 따라 chitosan(150 kDa)처리구가 chitosan (600 kDa)처리구보다 항균효과가 더 높게 나타나는 경향을 보여 저장 안정성이 높음을 알 수 있었다. 전단력은 전체적으로 다른 처리구에 비해 chitosan(150 kDa)처리구가 유의적으로(p<0.05) 낮은 값을 보여 연도가 향상되었음을 알 수 있었다. 따라서 침지처리시 chitosan의 분자량이 한우육의 품질을 결정하는 중요한 요인으로 사료된다.

蔘蘇飮과 蔘蘇飮加味方의 抗알레르기효과에 관한 實驗的 硏究 (The Experimental Study on the Anti-allergic Effects of Samsoeum and Samsoeumgamibang)

  • 남봉수;김윤범
    • 한방안이비인후피부과학회지
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    • 제15권1호
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    • pp.343-355
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    • 2002
  • Background : Although Samsoeum has been used frequently on allergic rhinitis, but there isn't any experimental research for that. Objective : This study was performed to investigate the anti-allergic effects of Samsoeum and Samsoeumgamibang. Materials and Methods : Katayama's method was used to observe the vascular permeability response induced by serotonin and histamine. Muller's method was used to observe the contact dermatitis response induced by picryl chloride. Miller's method was used to observe the delayed type hypersensitivity response to SRC. Results : 1. In the vascular permeability response to intradermal injection of serotonin, 2,600mg/kg, p.o. group of Samsoeum(蔘蘇飮), 1,300 and 2,600mg/kg, p.o. group of Samsoeumgamibang(蔘蘇飮加味方) showed significant inhibitory effects on the leakage of Evan's blue solution. 2. In the vascular permeability response to intradermal injection of histamine, 1,300 and 2,600mg/kg, p.o. group of Samsoeum, also 1,300 and 2,600mg/kg, p.o. group Samsoeumgamibang showed significant inhibitory effects on the leakage of Evan's blue solution. 3. In the contact dermatitis response induced by picryl chloride, 1,300 and 2,600mg/kg, p.o. group of Samsoeum, 1,300 and 2,600mg/kg, p.o. group of Samsoeumgamibang showed significant inhibitory effects on ear swelling formation. 4. In the delayed type hypersensitivity response to SRC. 2,600mg/kg, p.o. group of Samsoeum and 2,600mg/kg, p.o. group of Samsoeumgamibang showed significant inhibitory effects on foot swelling. Conclusion : This study shows that Samsoeum and Samsoeumgamibang may have anti-allergic effects. So Samsoeum and Samsoeurngamibang can be helpful to treat allergic rhinitis.

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Development of a coupled tendom driven robot hand

  • Choi, H.R.;Lee, Y.T.;Kim, J.H.;Chung, W.K.;Youm, Y.
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 1993년도 한국자동제어학술회의논문집(국제학술편); Seoul National University, Seoul; 20-22 Oct. 1993
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    • pp.185-190
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    • 1993
  • The POSTECH Hand adopting coupled tendon driven technique with planar two fingers is developed. The hand is designed to emulate principal motions of the human hand which has two and three joints respectively. Its kinematic parameters are determined through a parameter optimizing technique to aim at improving the isotropy of fingertip motions with new criterion functions of design. For the control of the hand, tension and torque control algorithms are developed. Based on the virtual stiffness concept, we develop the stiffness control method of a grasped object with redundant finger mechnism and investigate experimentally.

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Control of tendon driven one-link manipulator

  • Choi, H.R.;Lee, Y.T.;Kim, J.H.;Chung, W.K.;Youm, Y.
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 1992년도 한국자동제어학술회의논문집(국제학술편); KOEX, Seoul; 19-21 Oct. 1992
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    • pp.290-295
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    • 1992
  • Tendon driven method to drive one joint using two actuators is developed and implemented. While the method has advantages over conventional transmissions, it also has several drawbacks like tendon slack, elongation and endurability. In this paper, a compensation method of the intrinsic non-linearities of tendon is proposed to improve the performance of antagonistic tendon driven method. In this method, tendon tension measurement is prerequisite which is measured with strain gauge type tension sensor. The developed method is implemented on one link test bed with colocated and non-colocated position sensor.

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Isolation and Characterizaton of Plasmids from Streptomyces

  • Joe, Young-Ae;Goo, Yang-Mo
    • Journal of Microbiology and Biotechnology
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    • 제4권4호
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    • pp.278-284
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    • 1994
  • Streptomyces spp. purchased from American Type Culture Collection and Institute for Fermentation in Osaka, and donated from Northem Regional Research Laboratory, and those isolated from soil samples were assayed to isolate many plasmids harboring streptomycetes. Among these qrganisms, 5 small size-plasmid carrying organisms SNUS 8810-597A, 8810-600, 8810-754, 8811-344, and 8811-347 were characterized and their plasmids pSJ597, pSJ600, pSJ754, pSJ344, and pSJ347 were isolated in a large scale. The plasmid harboring organisms were sensitive to neomycin, kanamycin, gentamicin, and thiostreptone, but some of them showed weak or strong resistance against streptomycin, chloramphenicol, ampicillin, and tetracycline. It was confirmed that pSJ597 and pSJ600 do not carry antibiotic biosynthetic genes. pSJ600 showed a pock-forming character.

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Repassivation Behavior of Ni Base Alloys in a Mild Alkaline Water at 300℃

  • Hwang, Seong Sik;Kim, Dong Jin;Kim, Joung Soo;Kim, Hong Pyo
    • Corrosion Science and Technology
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    • 제5권3호
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    • pp.85-89
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    • 2006
  • KAERI(Korea Atomic Energy Research Institute) has developed a repassivation rate test system which can be operated at $300^{\circ}C$. It consists of an autoclave, three electrodes for an electrochemical test and a diamond scratch tip. All the electrodes are electrically insulated from the autoclave by using high temperature fittings. Reproducible repassivation curves of alloy 600 at 300 C were obtained. Repassivation rate of alloy 600 at pH 13 was slower than that of pH 10. Stress corrosion cracking test was carried as a function of the pH at a high temperature. At pH 10, alloy 600 showed a severe stress corrosion cracking(SCC), whereas it did not show a SCC at pH 7. From the viewpoint of a relationship between the current density and the charge density, a big difference was observed in the two solutions; the slope of pH 13 was steeper than that of pH 10. So the stress corrosion susceptibility at pH 13 seems to be higher than that of pH 10. The system would be a good tool to evaluate the SCC susceptibility of alloy 600 at a high temperature.

Analytical Techniques for Vancomycin - A Review

  • Avinash P. Sattur;Lee, Je-Hyuk;Song, Ki-Bang;T. Panda;Kim, Chul-Ho;Rhee, Sang-Ki;B. Gokul
    • Biotechnology and Bioprocess Engineering:BBE
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    • 제5권3호
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    • pp.153-158
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    • 2000
  • Vancomycin belongs to the vancomycin-risocetin family of glycopeptides, and is a subclass of linear sugar containg peptides composed of seven amino acids. Its strochemical configuration forms the basic of a peptidoglycon monomer. The glycosylated hexapeptide chainconsists of chloro-$\beta$-hydroxytyrosines, p-hytidoglycines, N-anthylleucine and aspartic acid forms a rigid molecular frame work and gives the difficulty in the analysis. Voncomycin in the serum samples is usually estimated by liquid chromatography and the bacterial sensitivity was genereally tested by the microbiological assay. The pressent review deals with the qualitative, quantutative, microbioligical and immunological assays and the comparison of the quantitative methods. Clinical implications of vancomycin have also been cited in the review.

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