• Title/Summary/Keyword: 레늄

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Separation and identification of selenoproteins in selenium-enriched yeast (셀레늄이 강화된 이스트에서 셀레늄 단백질의 분리 및 확인)

  • Kim, Kyong-Mi;Pak, Yong-Nam
    • Analytical Science and Technology
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    • v.26 no.6
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    • pp.357-363
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    • 2013
  • Selenium-containing proteins were separated from selenium-enriched yeast (SEY) using Trizol$^{(R)}$ reagent followed by anion exchange (AE) chromatography. This method is simpler and less time consuming than electrophoresis. Five selenium containing proteins were identified by on-line AE HPLC-ICP/MS (high performance liquid chromatography-inductively coupled plasma/mass spectrometry). Each protein was enzymatically hydrolyzed to seleno-amino acids and separated with RP (reverse phase) HPLC for the identification of selenoproteins.

Fabrication of Cu(Inx,Ga1-x)Se2 absorber layers using non-toxic rapid thermal selenziation (비 독성 셀레늄 팰릿을 이용하여 급속 열처리한 CIGS 흡수층 형성)

  • Cheon, Seong-Hyeon;Gwon, Yong-Hyeon;Jo, Hyeong-Gyun
    • Proceedings of the Korean Institute of Surface Engineering Conference
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    • 2013.05a
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    • pp.160-160
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    • 2013
  • 본 실험에서는 CIGS 흡수층을 스퍼터링 방식과 급속열처리 장비를 이용한 2-step 방식을 이용하여 형성시켰다. 전구체는 DC 스퍼터링 방법으로 $Cu_{0.75}Ga_{0.25}/In$의 다층 전구체를 구성 후, 독성이 없는 셀레늄 팰릿을 graphite 상자에 넣어 급속열처리 장비로 온도를 $475{\sim}680^{\circ}C$로 온도를 조절하면서 셀렌화 하였다. 이렇게 구성된 CIGS 흡수층의 특성을 scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), X-ray differection (XRD)를 통해서 측정을 하였다.

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Determination of Selenium in Dried Yeast Preparations (셀레늄 함유 건조효모제제 중 셀레늄 분석방법에 관한 연구)

  • Oh, Sea-Jong;Oh, Young-Taek;Yoon, Won-Yong;Park, Sung-Bae
    • Journal of Pharmaceutical Investigation
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    • v.24 no.1
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    • pp.29-32
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    • 1994
  • In order to improve the sensitivity of the current assay methods of selenium in dried-yeast preparations, atomic absorption spectrophotometry (AAS), high performance liquid chromatography (HPLC) and UV-Vis spectrophotometry were employed. The sample was prepared with the digestion by acid mixture of hydrochloric acid, nitric acid and perchloric acid after elimination of ether-soluble substances. The range of quantitation of selenium was $1.0{\sim}6.0\;{\mu}g/ml$ by UV-Vis spectrophotometry, $5.0{\sim}20.0\;{\mu}g/ml$ by HPLC and $0.03{\sim}0.10\;{\mu}g/ml$ by AAS.

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Development of Basking Neodymium Lamp Improving Reflector Globe and Rhenium Filament (레늄 필라멘트와 반사 글로브를 개선한 Basking Neodymium Lamp의 개발)

  • Eo, Ik-Soo;Yang, Hae-Sool
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.8 no.3
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    • pp.477-482
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    • 2007
  • This paper examines and analyzes improvement of structure of bulb, increase of luminous efficiency through application of reflector globe through aluminum coating and development of 60[W] basking neodymium lamp through optimum insertion ratio of krypton gas and nitrogen gas. The results of this development shows that the life of the lamp was 7,200 hours, and the luminous flux was 620[1m]. This brings in superior color temperature and superior color rendering index, which allows us to use that lamp for agricultural or general purpose.

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