• 제목/요약/키워드: aromatic

검색결과 2,776건 처리시간 0.038초

Genetic Effects on Exposure to Polycyclic Aromatic Hydrocarbons in a Korean Population

  • Yang, Mi-Hi
    • 대한약학회:학술대회논문집
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    • 대한약학회 2002년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.2
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    • pp.209-211
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    • 2002
  • A number of polycyclic aromatic hydrocarbons (PAHs), such as benzo[a]pyrene, are carcinogenic and thought to contribute to the overall burden of human cancer (1). PAHs are ubiquitous in the environment and humans are exposed to them via multi-pathways, e.g. air or soil of urban areas, exposure to direct or indirect tobacco smoke, and ingestion of food or water polluted by combustion effluents (2-3). (omitted)

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Diacetylene Polymerize in Amorphous State? Free Radical Initiated Polymerization of Aromatic Diacetylenes.

  • Beristain Miriam F.;Ogawa Takeshi
    • 한국고분자학회:학술대회논문집
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    • 한국고분자학회 2006년도 IUPAC International Symposium on Advanced Polymers for Emerging Technologies
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    • pp.321-321
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    • 2006
  • Aromatic diacetylenes form stable oligomeric diradicals when irradiated with UV light or heated at temperatures above their melting points. In this paper, the formation of stable diradicals is discussed, and the mechanism of polymerization in the presence of peroxide in solution, is discussed. The diphenyldiacetylene undergoes polymerization through coupling of diradicals, and not by the successive addition of radical species.

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Aromatic Acid and Flavonoids from the Leaves of Zanthoxylum piperitum

  • Hur, Jong-Moon;Park, Jong-Cheol;Hwang, Young-Hee
    • Natural Product Sciences
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    • 제7권1호
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    • pp.23-26
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    • 2001
  • Five flavonoids and one aromatic acid were isolated from the leaves of Zanthoxylum piperitum. The structures of compounds were elucidated as quercetin, afzelin, quercitrin, hyperoside, hesperidin and protocatechuic acid on the basis of spectral evidence.

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Aromatic Compounds and Tritepenoidal Saponins from Clematis koreana var. umbrosa

  • Whang, Wan-Kyunn
    • Archives of Pharmacal Research
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    • 제17권1호
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    • pp.5-10
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    • 1994
  • From the methanolic extract of aerial parts of Clematis koreana var. umbrosa, one new triterpenoidal saponin, 3-O-${\beta}$-D-xylopyranosyl(1-3)-${\alpha}$-L-arabinopyranosyl oleanolic acid 28-O-${\alpha}$-L-rhamnopyranosyl(1-4)-${\beta}$-glucopyranosyl(1-6)-${\beta}$-glucopyranosyl ESTER, along with five known aromatic compounds and two known triterpenoidal saponins were isolated.

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국내산 잎담배의 연기성분 연구 1. 비휘발성 성분을 중심으로 (Studies on Smoke Composition of Korean Tobacco Leaves 1.On the Non-Volatile Phase)

  • 오세열;황건중
    • 한국연초학회지
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    • 제5권2호
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    • pp.71-75
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    • 1983
  • The relative proportion of the major smoke components in the nonvolatile phase from some varieties of tobacco, 1. e. flue- cured, burley, and aromatic tobacco, were determined. In flue- cured tobacco smoke, hydroquinone and glycerol we re exhibited higher concentrations than in the smoke from the other tobaccos. In aromatic tobacco smoke, the contents of non-volatile phase were present in lower concentrations.

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Synthesis and Cyclization of Aromatic Polyhydroxyamides. 2. Polyhydroxyamides Containing Trifluoromethyl Group

  • Kim, Myung-Kyoon;Kim, Hae-Young;Baik, Doo-Hyun;Simon Kantor
    • 한국섬유공학회:학술대회논문집
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    • 한국섬유공학회 1998년도 가을 학술발표회논문집
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    • pp.41-44
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    • 1998
  • Wholly aromatic polybenzoxazoles (PBO) are well established as high performance materials with excellent thermal stability and mechanical properties. Heterocyclic precursor polymers such as polyhydroxyamides (PHA) have been interested in the field of high performance flame retardant polymers. The PHAs can be converted to PBOs when ignited. (omitted)

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Screening and Isolation of Antibiotic Resistance Inhibitors from Herb Materials-Resistance Inhibition of Volatile Components of Korean Aromatic Herbs

  • Lee, Chung-Kyu;Kim, Hye-Kyung;Moon, Kyung-Ho;Shin, Kuk-Hyun
    • Archives of Pharmacal Research
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    • 제21권1호
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    • pp.62-66
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    • 1998
  • The resistance inhibitory activities of 54 odorant mixtures (essential oil) from 41 Korean aromatic herbs were tested against multi-drug resistant Staphylococcus aureus SA2, which has resistances to 10 usual antibiotics including chloramphenicol. As results, combinations of 28 kinds of samples from 21 herbs and chloramphenicol have resistance inhibitory activities in dose dependent manner.

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