• 약학회지
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• 제38권3호
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• pp.274-280
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• 1994

A strain of actinomycetes producing extracellular adenosine deaminase inhibitor, strain V-8, was isolated from soil. Strain V-8 was gam positive and its cell wall chemotype was decided as cell wall chemotype I from analysis of diaminopimelic acid isomers and sugar pattern. This strain had a wide range of sugar utilization as carbon sources. The optimal pH and temperature for growth were $6.8{\sim}7.0$ and $28{\sim}30^{\circ}C$, respectively. From the morphological, chemotaxonomical characteristics and analysis of various physiological characteristics, the strain V-8 was identified Streptomyces sp.

• Journal of Microbiology and Biotechnology
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• 제8권3호
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• pp.222-228
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• 1998

The characteristics of cometabolic removal of xylenes by Alcaligenes xylosoxidans Y234 were investigated. m-Xylene was found to be degraded while ο- and p-xylene were biotransformed into cresols in the presence of benzene or toluene. A lower level of benzene was required than that of toluene to remove the same amount of xylenes, which suggested benzene was a more effective primary substrate than toluene. ο-Xylene was found to be the most toxic to Alcaligenes xylosoxidans Y234 followed by p-xylene and m-xylene. Rates of cell decay during cometabolic removal of ο-, m-, or p-xylene were decreased by up to $76\%$ when benzene-adapted cells were inoculated. Xylenes were removed efficiently using benzene-adapted cells.

• 대한화학회지
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• 제12권3호
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• pp.128-137
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• 1968

In the oligomerization of p-aminophenol by the catalytic action of Fe-EDTA complex in the aqueous medium, the mixed complex intermediate, Fe-EDTA-M type, is considered to be formed, from which active radicals of the monomer are produced. In this system, polymerization is presumed to proceed as follows: Free radical formation ${\to}$ Coupling ${\to}$ Activation ${\to}$ Coupling, and so on. In this study, the form of the monomer and coordination state in the mixed complex, the catalytic action of Fe-EDTA the complex, the reaction mechanism, and the structure of the oligomers are discussed.

• 대한화학회지
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• 제22권3호
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• pp.133-137
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• 1978

새로운 네자리 아민리간드 1,10-dipropyl-5R-methyltriethylenetetramine(R-$Pr_2$metrien)이 합성되었고 이 리간드로부터 디클로로 몇 디니트로코발트(III) 착물이 합성되었다. 합성된 리간드는 트란스 이성체의 착물만을 형성할 것이 예측되었으며 예측된대로 트란스 이성체만을 형성하였다. 원소분석, 핵자기공명분광학, 흡수분광분석 및 원편광이색성분광법을 이용하여 리간드와 착물의 구조가 설명되었다.

• Biotechnology and Bioprocess Engineering:BBE
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• 제5권3호
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• pp.191-195
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• 2000

Quantitation of N7-methyldeoxyguanosine (N7-MedG) produced in the in vitro N-methly-N-nitrosuourea (NMU) action on thymus DNA has been achieved by enzymatic degradation, liquid chromatoraphic separaphic separation and desorption chemical ionization tandem mass spectrometry. In conjunction with the resolving power HPLC in the separation of isomers, desorprion chemical ionization tandem mass spectrometry has utilized in determining modified nucleosides at low levels using a stable-isotope labled compound as an internal reforence. The quantitative estimation of N7-methyldeoxyguanosine was previously established by an independent HPLC analysis of methylated calf thymus DNA. A sensitive and specific methodogy for the quantitation of N7-MedG at the picomole level using HPLC combined with tandem mass spectrometry without radioisotope labeling process is presented. The potential of the liquid chromatoraphic tandem mass exposure to methlation agents in vitro.

• 한국생명과학회:학술대회논문집
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• 한국생명과학회 2005년도 국제학술심포지움 The 44th Annual Meeting of Korean Society for Life Science
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• pp.220-220
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• 2005

• 한국생명과학회:학술대회논문집
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• 한국생명과학회 2005년도 국제학술심포지움 The 44th Annual Meeting of Korean Society for Life Science
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• pp.221-221
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• 2005

• 한국산업융합학회 논문집
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• 제12권3호
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• pp.143-147
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• 2009

The enantioselective reduction of representative prochiral alkyl-aryl ketones with a new chiral alkoxy-amine-aluminum derivatives from aluminum hydride and ${\alpha},{\alpha}$-diphenyl-${\beta}$-amino alcohols, such as (S)-(-)-2-amino-3-methyl-1,1-diphenylbutan-1-ol(AMDPB) and (S)-(-)-2-(diphenylhydroxy-methyl)pyrrolidine(DPHMP), in THF at $0^{\circ}C$ was studied. In the reduction of alkoxy-amine-aluminum derivatives, acetophenone, propiophenone, isopropiophenone, and butyrophenone are reduced to corresponding aromatic secoundary alcohols with 34~60 % enantiomeric excess of (S)-isomers. For such ketones, the optical induction was enhanced by increasing a size of alkyl groups.

• Mass Spectrometry Letters
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• 제11권1호
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• pp.6-9
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• 2020

Matrix-assisted laser desorption/ionization-mass spectrometry (MALDI-MS) analysis of ionic liquid matrices (ILMs) prepared using pyridine and dihydroxybenzoic acid (DHB), such as 2,3-DHB and 2,5-DHB, displayed an unconventional peak at m/z 232.0, which was regarded as [DHB+pyridine-H]⁺. The peak at m/z 232.0 was not observed from other ILMs prepared using other DHB isomers, such as 2,4-DHB, 2,6-DHB, 3,4-DHB, and 3,5-DHB. Two requirements to observe the peak at m/z 232.0 in a DHB/pyridine ILM are suggested. First, carboxyl and hydroxyl groups must be located ortho to each other. Second, the secondary hydroxyl group must be located at a carbon with a high electron density. Based on these two requirements, a potential mechanism for the generation of the peak at m/z 232.0 is suggested.

• 한국독성학회:학술대회논문집
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• 한국독성학회 2005년도 춘계 국제심포지엄 및 학술대회
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• pp.181-181
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• 2005