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박유철,구본권 慶北大學校 産業開發硏究所 1981 硏究報告 Vol.9 No.-
Absorption spectra and kinetics of solvated electrons in solvent mixtures give some information about the properties of solvated electrons. In this paper the reaction between solvated electrons and benzene in several tetrahydrofuran/water mixtures will be investigated in the temperature range 260K<T<325K by Laser-Flash-Spectroscopy. Solvent and temperature dependence of absorption spectra will be discussed. In this study, it is found that the maximum wavelengths of the absorption shectrum were increased with increasing THF content and temperature.
磁性浦捉劑 δ-FeOOH의 製造와 이를 利用한 重金屬이온의 處理
오상오,박유철,구본권 慶北大學校 1980 論文集 Vol.30 No.-
자성포착제 δ-FeOOH는 황산철과 수산화나트륨 수용액을 반응시켜 얻은 수산화철 용액에 오존을 급격히 통하게 하여 합성했다. 실온에서 산화시간을 일정하게 하고 황산철에 대한 수산화나트륨의 농도 변화에 따른 δ-FeOOH의 생성에 대한 최적조건을 조사했다. 이러한 조건하에서 만든 산화철로써 폐수중의 중금속이온 즉 Cd^2+, Cr^6+, As^3+, Pb^2+, Hg^2+를 처리하고 그 결과를 보고한다. Magnetic seeding material, δ-FeOOH was prepared by passing through ozone to Fe(OH)_2, which is made by reaction the aqueous solution of the ferrous sulfate with the sodium hydroxide. In order to find the condition of formation of δ-FeOOH at room temperature, the variation of concentration of sodium hydroxide against ferrous sulfate was considered at constant oxidation time. Under these conditions, the degree of treatment for heavy metal ions, such as Cd^2+, Cr^6+, As^3+, Pb^2+, and Hg^2+ in waste water were discussed.
Functional Analysis of the BMP4 Antagonists During Drosophila Embryo and Wing Development
Yu, Kweon The Korean Society for Biomedical Laboratory Scien 2006 Journal of biomedical laboratory sciences Vol.12 No.4
Drosophila Sog and vertebrate Noggin play important roles during development. They function as antagonists against BMP4 signaling and induce neural ectoderm during embryogenesis. They are also engaged in appendage formation by inhibiting BMP4 signaling during late development. To understand further functions of Sog, Supersog, which is a more potent form of Sog, and Noggin BMP4 antagonists during development, I performed the molecular genetic analysis using Drosophila embryogenesis and wing formation as assay systems. In cellular blastoderm embryos, Sog inhibited Dpp signaling, Drosophila BMP4 signaling, whereas Supersog or Noggin did not block Dpp signaling. During wing formation, Sog inhibited Sax type I receptor of Dpp signaling whereas Noggin inhibited Tkv type I receptor of Dpp signaling. However, Supersog inhibited both Sax and Tkv type I receptors. These results suggest that functions of BMP4 antagonists are developmental stage dependent and indicate that each BMP4 antagonist inhibits BMP4 signaling by blocking different BMP4 receptors.