• Title/Summary/Keyword: zipper

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A Study on the Properties of Commercial Zippers (시판지퍼의 물성에 관한 연구)

  • Joo Jeong Ae;Cha Ok Seon
    • Journal of the Korean Society of Clothing and Textiles
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    • v.9 no.2
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    • pp.35-43
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    • 1985
  • The purpose of this study was to analyse the characteristics and the problems of commercial zippers such as polyester coil zippers, plastic zippers and brass zippers by testing their properties. The sizes of the samples used for this were $\sharp$3, $\sharp$5 and $\sharp$8($\sharp$7 only in case of brass zippers), and all of them were selected in the same lot and collected from 4 different domestic companies. Original samples and another samples laundered 1, 3, 5 and 10 times were measured in terms of colorfastness, durability of coating of zipper, longitudinal dimensional change, operability of zipper, strength of zipper chain crosswise, and reciprocating movement of zipper. In conclusion, the properties of the zippers were revealed differently according to their kinds. Therefore, it was recommended that the present test standard should be modified, in order to improve them in quality.

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The Improved Antigen-binding Activity of Biosimilar Remicade ScFv Antibodies by Fusion of the Leucine Zipper Domain (Leucine zipper도메인의 융합에 의한 바이오시밀러 레미케이드 Single-chain Fv 항체의 항원 결합력 개선)

  • Kim, Jin-Kyoo;Kim, Tae Hwan
    • Journal of Life Science
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    • v.30 no.11
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    • pp.1012-1020
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    • 2020
  • Remicade is a therapeutic biosimilar natural antibody in which the mouse variable domain has been linked to the human constant domain. It is a chimeric monoclonal antibody specific to tumor necrosis factor-alpha (TNF-α) and has been developed for the treatment of rheumatoid arthritis. To investigate the biological activity of the Remicade antibody, we carried out a bioinformatics study using a protein data bank to characterize the TNF-α antigen binding mechanism of the Remicade natural antibody. Because the production of the Remicade antibody is often limited by genetic instability of the natural antibody-producing cell, we generated a Remicade single-chain variable domain fragment antibody (Remicade) in which a heavy chain variable domain (VH) is joined with a light chain variable domain (VL) by a polypeptide linker. Furthermore, Remicade was fused to a leucine zipper (RemicadeScZip) for higher production and higher antigen-binding activity than Remicade. The Remicade and Remicade ScZip were expressed in Escherichia coli and purified by a Ni+-NTA-agarose column. As expected, the purified proteins had migrated as 28.80 kDa and 33.96 kDa in sodium dodecyl sulfate-polyacrylamide electrophoresis. The TNF-α antigen binding activity of Remicade was not observed by ELISA and western blot. In contrast, RemicadeScZip showed antigen-binding activity. Additional bio-layer interferometry analysis confirmed the antigen-binding activity of RemicadeScZip, suggesting that the leucine zipper stabilized the folding of RemicadeScZip in a denatured condition and improved the TNF-α antigenbinding activity.

Member Sizing Optimization for Seismic Design of the Inverted V-braced Steel Frames with Suspended Zipper Strut (Zipper를 가진 역V형 가새골조의 다목적 최적내진설계기법)

  • Oh, Byung-Kwan;Park, Hyo-Seon;Choi, Se-Woon
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.29 no.6
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    • pp.555-562
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    • 2016
  • Seismic design of braced frames that simultaneously considers economic issues and structural performance represents a rather complicated engineering problem, and therefore, a systematic and well-established methodology is needed. This study proposes a multi-objective seismic design method for an inverted V-braced frame with suspended zipper struts that uses the non-dominated sorting genetic algorithm-II(NSGA-II). The structural weight and the maximum inter-story drift ratio as the objective functions are simultaneously minimized to optimize the cost and seismic performance of the structure. To investigate which of strength- and performance-based design criteria for braced frames is the critical design condition, the constraint conditions on the two design methods are simultaneously considered (i.e. the constraint conditions based on the strength and plastic deformation of members). The linear static analysis method and the nonlinear static analysis method are adopted to check the strength- and plastic deformation-based design constraints, respectively. The proposed optimal method are applied to three- and six-story steel frame examples, and the solutions improved for the considered objective functions were found.

Homeodomain-leucine Zipper Proteins Interact with a Plant Homologue of the Transcriptional Co-activator Multiprotein Bridging Factor 1

  • Zanetti, Maria Eugenia;Chan, Raquel L.;Godoy, Andrea V.;Gonzalez, Daniel H.;Casalongue, Claudia A.
    • BMB Reports
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    • v.37 no.3
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    • pp.320-334
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    • 2004
  • StMBF1 (Solanum tuberosum multiprotein bridging factor 1) is a plant member of the MBF1 family of transcriptional co-activators. In an attempt to understand the role of StMBF1, we analyzed its interaction with plant transcription factors of the homeodomain-leucine zipper (Hd-Zip) family, a group of proteins with a typical leucine zipper motif adjacent to a homeodomain. StMBF1 is able to interact in vitro with the Hd-Zip protein Hahb-4 both in the presence and absence of DNA. Upon binding, StMBF1 increases the DNA binding affinity of Hahb-4, and of another plant homeodomain containing protein from the GL2/Hd-Zip IV family, HAHR-1. The biological role of interactions is discussed in this paper.

A Comparative Study on the Sewing Teaching of 'Tight Skirts' in Teaching Materials of Clothes Configuration (의복구성 교재에 나타난 타이트스커트 봉제 방법에 관한 비교 연구)

  • Kim, Sun-Young;Choi, Young-Soon
    • Journal of the Korean Society of Costume
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    • v.56 no.8 s.108
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    • pp.113-122
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    • 2006
  • In this study, about forty teaching materials have been analyzed in order to examine tight skirt sewing methodtreated in basic process in a college and a fashion related educational institution. The study objects limited with a belt, back centered zipper, and back double slits on a tight skirt, and used fifteen suitable teaching materials in this study. The first study result appeared that every single teaching material suggested the different way of wick adhesion which is used in zipper slit, back slit, and belt part when the skit has been manufactured in order to do a form of clothes well. Secondly, it is the case of a back slit part used for the purpose of both functionality of action and decoration, and it is the section which varies a sewing and cutting way according to seam room width of a back middle seam. However, the majority of teaching materials appeared by being selecting the way how it had cut an inseam of the back center by the both upper part of back slit. Finally, the result showed that it mentioned mainly only both sided zipper sewing method if it seems to be easy to treat the majority in a basic process even though use of a console zipper Is general on a zipper sowing way recently for several years. Also, two forms are used in the belt manufacturing, and they are based with a waist line. However, the teaching materials that were used in this study presented only a manufacture way of the straight line on the waist belt.

Study on the Rheological Properties of Acorn Starch(III) -Effect of sucrose on the Rheological Properties of Acorn Starch- (Acorn Starch의 유변학적 성질에 관한 연구(III) -Acorn Starch의 유변학적 성질에 미치는 Surcrose 효과를 중심으로-)

  • 김남희
    • The Korean Journal of Rheology
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    • v.10 no.1
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    • pp.7-13
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    • 1998
  • 중량 평균 분자량이 1.22$\times$106이고 다분산도가 8.90이며 수분과 아밀로오스 함량이 각각 9.35%, 27%인 도토리 전분에 sucrose를 첨가하여 동적 유변학적 특성에 대한 온도와 농도의존성을 고찰하였다. AS(acorn starch)-sucrose 계의 점도는 전단속도가 증가하면 감 소하는 전단담화 현상을 나타내며 sucrose 농도가 증가할수록 점도가 증가하였고, Casson 식에 의해 얻어진 항복치는 sucrose 농도가 증가하면 증가하였다. 저장영률과 손실영률은 sucrose 농도가 증가하면 단일하게 증가하였고 손실 탄성률은 온도가 증가하면 감소하였다. DSC 측정자료를 zipper model에 적용시켜 본 결과 sucrose 농도가 증가할수록 zipper의 수 와 junc-tion zone의 수는 증가했으며 크기는 감소하였다. Sucrose는 전분과 수소결합을 형 성하여 용액내에서 가소제처럼 거동함을 알수있었다.

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Isolation and Characterization of a Basic Leucine Zipper Gene in Poplar (Populus alba × P. glandulosa) (현사시나무에서 Basic Leucine Zipper 유전자의 분리와 특성 구명)

  • Yoon, Seo-Kyung;Lee, Hyoshin;Bae, Eun-Kyung;Choi, Young-Im;Kim, Joon-Hyeok;Noh, Seol Ah
    • Journal of Korean Society of Forest Science
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    • v.103 no.2
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    • pp.189-195
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    • 2014
  • Basic leucine zipper (bZIP) protein is a regulatory transcription factor that plays crucial roles in growth, development and stress response of plant. In this study, we isolated a PagbZIP1 gene that belonged to Group SE3 of bZIP from Populus alba ${\times}$ P. glandulosa, and investigated its expressional characteristics. The PagbZIP1 is 844 base pairs long and encodes a putative 144-amino-acid protein with an expected molecular mass of 16.6 kDa. The PagbZIP1 has two conserved domains including the basic and leucine zipper portions. Southern blot analysis revealed that two copies of the gene are presented in the poplar genome. PagbZIP1 was specifically expressed in the root and suspension cells. Moreover, the expression of PagbZIP1 was induced by drought, salt, cold and ABA. Therefore, our results indicated that PagbZIP1 might be expressed in response to abiotic stress through the ABA-mediated signaling pathway in poplar.

Function and Oligomerization Study of the Leucine Zipper-like Domain in P13 from Leucania separata Multiple Nuclear Polyhedrosis Virus

  • Du, Enqi;Yao, Lunguang;Xu, Hua;Lu, Songya;Qi, Yipeng
    • BMB Reports
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    • v.40 no.2
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    • pp.232-238
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    • 2007
  • The p13 gene is uniquely present in Group II nucleopolyhedroviruses (NPVs) and some granuloviruses, but not in Group I NPVs. p13 gene was first described by our laboratory in Leucania separatamultiple nuclear polyhedrosis virus (Ls-p13) in 1995. However, the functions of Ls-P13 and of its homologues are unknown. When Ls-p13 was inserted into Autographa californica nucleopolyhedrovirus, a Group I NPV, polyhedra yield was inhibited. However, this inhibition was prevented when the leucine zipper-like domain of Ls-p13 was mutated. To determine the cause of this marked difference between Ls-P13 and leucine zipper mutated Ls-P13 (Ls-P13mL), oligomerization and secondary structure analyses were performed. High performance liquid chromatography and yeast two-hybrid assays indicated that neither Ls-P13 nor Ls-P13mL could form oligomers. Informatics and circular dichroism spectropolarimetry results further indicated marked secondary structural differences between Ls-P13 and Ls-P13mL. The LZLD of Ls-P13 has two extended heptad repeat units which form a hydrophobic surface, but it is short of a third hydrophobic heptad repeat unit for oligomerization. However, the mutated LZLD of Ls-P13mL lacks the above hydrophobic surface, and its secondary structure is markedly different. This difference in its secondary structure may explain why Ls-P13mL is unable to inhibit polyhedra yield.