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Stabilization of Bacillus subtilis Lipase A by increasing the residual packing
Abraham1, Tajo,Pil Pack1, Seung,Je Yoo, Young Taylor Francis 2005 Biocatalysis and biotransformation Vol.23 No.3
<P>Introduction of well-packed residues to the interior of a protein structure could be considered as a stabilization strategy since the reduction of buried cavities might stabilize protein structure. In this study, the less-packed residues with no water-contact were selected as target sites for increasing residual packing. When Lipase A from Bacillus subtilis (179 amino acids) was used as a model system, 43 less-packed residues were initially considered by analyzing their residual packing value and residual exposure ratio. Among the 43 residues, small amino acids such as GLY and ALA were chosen as target sites. Packing increases of ALA to VAL and GLY to ALA were estimated, by molecular modeling, to give 0.5368∼⃒0.7433  kcal mol −1 stabilization. Mutants of Lipase A such as A38V, A75V, G80A, A105V A146V, and G172A were obtained via protein engineering. Thermostability assays revealed that A38V, G80A and G172V were the most stable mutants. This procedure for selecting the target residues for improved thermostability of Lipase A could be applied for improving the thermostability of other proteins and enzymes.</P>
최경덕(Kyeongduck Choi),유상길(Sanggil Yoo),강희선(Heesun Kang),박상민(Sangmin Pack) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper discusses on development of a BMS(Battery Management System) for D-HEV(Diesel-Hybrid Electronic Vehicle) including algorithm of battery(Lithium) SOC(State of Charge) estimation. The algorithm accurately estimates the remaining battery capacity for automated battery management. In this paper, a BMS including technique for battery monitoring(Pack-Voltage, Pack-Current, Cell-Voltage, Pack-Temperature), communication method, digital input/output control, a battery thermal control, and battery protection method is developed.
백민식(Min-Sik Pack),이시연(Si-Yeon Lee),양보석(Bo-Suk Yang),최성철(Sung-Choul Choi),이재근(Jae-Geun Lee) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
This paper presents a control plan of clearances for power plant steam turbine with the characteristics of internal clearances. Internal clearances on the interstage of blades and shaft gland seals on the steam turbine which are installed in tandem compound was changed when the rotor turned in the cylindrical sleeve bearing due to the generation of oil film wedge. This presented concern is very useful to prevent the rubbing damage of seal edge between the fixed and moving parts in steam turbine due to the misalignment at the rotating and stationary parts. This method is applied for the unbalanced clearances distribution to the left and right sides in the turbine casing. A considerable amount of unbalanced clearances distribution trend is determined according to the rotating speed of shaft, bearing size, type of journal bearing, bearing load, lubrication oil viscosity, oil temperature, oil pressure and surface roughness of shaft.
Pack, Seung-Chul,Kim, Hye-Ran,Lim, Sang-Woo,Kim, Hwan-Young,Ko, Jung-Yun,Lee, Ki-Sang,Hwang, David,Park, Seong-Il,Kang, Hoon,Park, Sang-Wook,Hong, Gun-Young,Hwang, Se-Min,Shin, Myung-Geun,Lee, Soong Springer International ; Springer-Verlag, distribu 2013 International journal of colorectal disease Vol.28 No.1
<P>The purpose of present study was to investigate the methylation status of the promoter region in five genes (mothers against decapentaplegic homolog 4, fragile histidine triad protein, death-associated protein kinase 1, adenomatous polyposis coli (APC), and E-cadherin), which are known to be involved in the pathogenesis of colorectal cancer (CRC) and its clinicopathological significance.</P>
Pack, C.G.,Song, M.R.,Lee Tae, E.,Hiroshima, M.,Byun, K.H.,Kim, J.S.,Sako, Y. Elsevier Science Publishers 2012 Journal of controlled release Vol.163 No.3
For quantitative analysis of nanoparticle diffusions and submicro-environments in living cells, use of newly synthesized silica-based fluorescent nanoparticle (Si-FNP) as a standard nanoprobe is successfully demonstrated. The appropriate characteristics of a standard probe were fully analyzed in vitro by single molecule detection, transmission electron microscopy, and dynamic light scattering. Using fluorescence correlation analysis in single living cells, we quantitatively compared the diffusional properties of the standard Si-FNP with a diameter of 50nm, peptide coated Si-FNP, streptavidin coated Qdot, and GFP molecule which have different sizes and surface properties. The result demonstrates that the standard Si-FNP without coat is minimally trapped in the vesicles in the process of cellular endocytosis. Interestingly, a large proportion of Si-FNP introduced into the cells by electroporation diffuses freely in the cells during a cell cycle suggesting free diffusing NPs are hardly trapped in the vesicles. The simple but highly sensitive method will provide insight into strategies to understanding the hydrodynamic process of nanoparticle delivery into living cells as well as the cellular microenvironment in the view of submicro-size.
STUDIEN ZUM MITTELHOCHDEUTSCHEN SCHWANK(I)
PACK,Sang Be 同德女子大學校 1992 同大論叢 Vol.22 No.1
유럽의 골계문학은 9세기에서 10세기에 걸쳐 독일과 불란서에서 라틴어로 씌어진 Schwank 작품들이 등장하면서 시작된다. 이들은 대개 고대 Antike나 근동 Orient에서 소재나 모티브를 수용할 것으로 중세의 음유가인의 시가 Spielmannsdichtung에서 이미 그 변용의 형태가 보이고, 십자군 원정으로 활발한 모티브 교환이 있었음을 알 수 있다. 13세기경 Stricker에 의한 불란서 우화의 수용, 5세기경 독일적 골계인물의 형성을 거쳐 16세기에 Hans Sachs에 의해 본격적 골계문학이 전개된다. 17세기에는 Grimmelshausen, 18세기에는 G. A. Burger, J. H. Voss, J. p. Hebel등에 의해 이 장르가 발전되었고 19세기에 G. Keller의 Schildburgertum에서 그 정점에 이른다. 본 논문은 독일골계문학의 뿌리역을 맡고 있는 중세의 두개의 Schwank작품을 우선 택하여 그것의 발생, 전래, 간행물(서지), 소재사, 주제사, 구성, 양식, 내용 등을 중심으로 하여 제 학자들의 연구와 그 논쟁점을 재고함과 아울러 비판해 본 것이다. 이 작업은 중고지독어로 씌어진 골계문학 전반의 연구를 위한 그 일단계가 된다.
KREUZ UND ORDO BEI OTFRID : Interpretation des Kapitels V, I
PACK, Sang Be 同德女子大學校 1993 同大論叢 Vol.23 No.1
오트프리트 폰 바이쎈부르크 Otfrid von Weissenburg는 9세기 후반기에 6천여행에 달하는 대서사시 Evangelienbuch를 쓴 독일의 시인이다. 그는 두운법 Stabreim으로 일관되어 왔던 게르만의 시문학을 극복하여 각운법 Endreim을 독일에서 최초로 이 서사시에 도입하여 성공을 거두었다는 점에서 독일시 운률사에 획기적 전환점을 마련했다고 평가 받고 있다. 본 논문은 여러 독일 중세연구가들의 연구물들을 토대로하여 이 대서사시(5부로 형성되었음)의 구성 Komposition에 있어 제기된 문제점, 특히 수리상징 Zahlensymbolik과 그 해석의 논쟁점을 정리, 소개하면서 재검토해 보는 형식을 취했다. 그것도 작품의 전반에 대한 검토에 앞서 우선 제5서 1장을 주대상으로 하여 그 경계를 한정할 수 밖에 없었다. 주로 이 상징해석에 적극적인 태로를 견지한 학자들의 입장에 주안점을 둔 것이며, 이에 비판적인 학자들의 입장에 대해서는 차후 따로 정리, 그 대안점을 구체적으로 밝혀 놓을 생각이다. Johannes Rathofer가 1962년 이 해석의 가능성을 천명한 이래 이에 대한 찬반양론은 학계의 큰 관심사로 머물고 있기 때문이다.