• 제목/요약/키워드: Synthesis

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Synthesis of Peptides by Bovine Gastricsin

  • Yoon, Joo-Ok;Kim, Young-Jun
    • BMB Reports
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    • 제28권1호
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    • pp.68-71
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    • 1995
  • Bovine gastricsin catalyzes peptide synthesis over an optimum range of pH 4~5, resulting in satisfactory yields of methyl esters and p-nitroanilides of benzyloxycarbonyl tetra- to hexa-peptides, provided that hydrophobic amino acid residues form new peptide bonds. The effectiveness of the enzyme also depends on the nature of adjacent amino acid residues. An aspartic proteinase with a characteristic gastricsin specificity pattern would be useful for the synthesis of middle-length peptides.

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화학공정의 제어구조 합성에 관한 연구 (A study on the regulatory control structure synthesis in chemical processes)

  • 심문호;윤인섭;송형근
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 1986년도 한국자동제어학술회의논문집; 한국과학기술대학, 충남; 17-18 Oct. 1986
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    • pp.205-208
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    • 1986
  • The synthesis of control structure involves the selection of controlled variable (or measured variable), and the structure interconnecting measured and manipulated variables (control loops). This paper deals with the synthesis job by using the structural analysis and block relative gain. This synthesis tool is very useful because they require minimal information, and the results show that this is a systematic and efficient metholodgy.

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Reactivity and Suitability of t-Boc-protected Thiophosphotyrosine Intermediate Analogs for the Solid or Solution Phase Peptide Synthesis

  • Kim, Eun-Kyung;Choi, Hee-Sung;Lee, Eung-Seok
    • Archives of Pharmacal Research
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    • 제21권3호
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    • pp.330-337
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    • 1998
  • N-(tert-Butoxycarbonyl)-O-(dimethythiophosphono)-L-tyrosine (6) and N-(tert-butoxycarbonyl)-O-(dicyanoethylthiophosphono)-L-tyrosine (15) were prepared as intermediates for the synthesis of thiophosphotyrosine-containing peptides. The reactivity and suitability of two compounds for the solid phase or solution phase peptide synthesis utilizing t-Boc chemistry were examined.

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One-Pot Synthesis of 2H-Pyrans by Indium(III) Chloride-Catalyzed Reactions.Efficient Synthesis of Pyranocoumarins, Pyranophenalenones, and Pyranoquinolinones

  • Lee, Yong-Rok;Kim, Do-Hoon;Shim, Jae-Jin;Kim, Seog K.;Park, Jung-Hag;Cha, Jin-Soon;Lee, Chong-Soon
    • Bulletin of the Korean Chemical Society
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    • 제23권7호
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    • pp.998-1002
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    • 2002
  • An efficient synthesis of 2H-pyrans is achieved by indium (III) chloride-catalyzed reactions of 1,3-dicarbonyl compounds with a variety of $\alpha\beta-unsaturated$, aldehydes in moderate yields. This method has been applied to the synthesis of pyranocoumar ins, pyranophenalenones, and pyranoquinolinone alkaloids.

Asymmetric Ring Opening of Epoxides Catalyzed by Novel Heterobimetallic Schiff-Bases Containing Transition Metal Salts

  • Kawthekar, RahulB;Bi, Wentao;Kim, Geon-Joong
    • Bulletin of the Korean Chemical Society
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    • 제29권2호
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    • pp.313-318
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    • 2008
  • An enantioselective ring opening of racemic terminal epoxides has been achieved by using heterobimetallic cobalt salen complexes with variety of nucleophiles. They were proven to be highly enantioselective and reactive for the synthesis of valuable chiral building blocks in enantio-riched forms up to 98% ee.

역추적 시스토릭 어레이 구조 비터비 복호기의 파이프라인 합성 (A pipeline synthesis for a trace-back systolic array viterbi decoder)

  • 정희도;김종태
    • 전자공학회논문지C
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    • 제35C권3호
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    • pp.24-31
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    • 1998
  • This paper presents a pipeline high-level synthesis tool for designing trace-back systolic array viterbi decoder. It consists of a dta flow graph(DFG) generator and a pipeline data path synthesis tool. First, the DFG of the vitrebi decoder is generated in the from of VHDL netlist. The inputs to the DFG generator are parameters of the convolution encoder. Next, the pipeline scheduling and allocationare performed. The synthesis tool explores the design space efficiently, synthesizes various designs which meet the given constraints, and choose the best one.

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연소합성법을 이용한 Ni 분말 합성에서 첨가 연료의 영향 (Effect of Fuel on Synthesis of Nanocrystalline Ni particles by a Combustion Synthesis Process)

  • 정충환;신형철;이희균;홍계원;윤순길
    • 한국분말재료학회지
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    • 제8권1호
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    • pp.13-19
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    • 2001
  • Ni and NiO particles were made by a combustion synthesis process. The characteristics of synthesized powders were investigated with various kinds and amounts of fuels such as urea, citric acid and glycine. Ni phase particles without NiO phase were obtained through combustion synthesis process in air atmosphere with-out further calcinations process, when the content of glycine was 2.44 times of the stoichiometric ratio in the precursor solution. Primary particle sizes of synthesized Ni and NiO particles were about 20∼30 nm.

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Synthetic Cephalosporin Derivatives

  • Oh, Chang-Hyun;Park, Sang-Woo;Cho, Jung-Hyuck
    • Bulletin of the Korean Chemical Society
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    • 제11권4호
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    • pp.323-327
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    • 1990
  • The synthesis and some biological properties of $7{\beta} $-[2-(Z)-(2-aminothiazole-4-yl)-2-(N-substitutedcar bonyl)ethoxyiminoacetamido]-3-vinyl-3-cephem-4- carboxylic acid are described. The effect of substituents on the carbamoly group in the 7-side chain were investigated in order to improve antibacterial activities. Two of these new orally active $7{\beta} $-lactam derivatives showed wide expanded antimicrobial activities against Gram-positive and Gram-negative bacteria, including Pseudomonas aeruginosa, as well as good stability to $7{\beta} $ -lactamases.