• Title/Summary/Keyword: $UCl_3$

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Effect of Rare Earth Elements on Uranium Electrodeposition in LiCl-KCl Eutectic Salt (LiCl-KCl 공융염에서 우라늄 전착거동에 대한 희토류 원소들의 영향)

  • Park, Sungbin;Kang, Young-Ho;Hwang, Sung Chan;Lee, Hansoo;Paek, Seungwoo;Ahn, Do-Hee
    • Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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    • v.13 no.4
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    • pp.263-269
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    • 2015

  • It is necessary to investigate the electrodeposition behavior of uranium and other elements on the cathode in the electrorefining process to recover the uranium selectively from the reduced metals of the electrolytic reduction process since transuranic elements and rare earth elements is dissolved in the LiCl-KCl eutectic salt. Study on separation factors of U, Ce, Y and Nd based on U and Ce was performed to investigate the deposition behavior of the cathode with respect to the concentration of rare earth elements in LiCl-KCl eutectic salt. After electrorefining with constant current mode by using Ce metal as a sacrifice anode, the contents of U, Ce, Y and Nd in the salt phase and the deposit phase of the cathode were analyzed, and separation factors of the elements were obtained from the analyses. Securing conditions of pure uranium recovery in the elctrorefining process was investigated by considering the separation factors with respect to $UCl_3$ and $CeCl_3/UCl_3$ ratio.

  • https://doi.org/10.7733/jnfcwt.2015.13.4.263 인용 PDF KSCI

Protective Effect of Cosmetics Containing Red Beet against Cigarette Smoke-induced Oxidative Damage in Human Skin (레드비트를 함유하는 화장품의 담배 연기에 의한 피부 지질 산화 방지 효과)

  • Seo, Cho Rong;Ha, Tae Hyun;Moon, Ji Young;Kim, Jeong Mi;Park, Byoung Kwon;Lee, Ji Won;Park, Jin Oh;Shin, Jin Hee
    • Journal of the Society of Cosmetic Scientists of Korea
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    • v.44 no.2
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    • pp.111-116
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    • 2018

  • In cosmetics market, anti-pollution products recently come up with new solution for skin health. Environmental oxidation mechanisms are realized as bio-marker of atmospheric pollution upon skin by environmental pollutant such as ozone, UV rays, particulate matter (PM) as well as cigarette smoke. The exposure of cigarette smoke directly or indirectly causes the oxidation of the stratum corneum skin lipids, resulting in the conversion of squalene to squalene monohydroperoxide and/or generation of malondialdehyde (MDA) as a product of lipid peroxidation. The aim of this study is to see whether new cosmetics product containing red beet has anti-oxidation effect on skin exposed by cigarette smoke. So as to determine oxidative damage to human skin at biochemical level, each unit area of volar forearms was exposed to cigarette smoke through device (3.3 cm, diameter) for fifteen minutes, then measured MDA using standardized TBARS assay kit. Compared to negative control (untreated and unexposed area), the level of MDA was significantly increased at positive control (untreated and exposed area) more than 3.7 times, indicating the pollutant induced-oxidative damage on the skin barrier. Whereas, the pre-applied area with the cosmetics products containing red beet revealed a decrease of 25% compared with positive control. As reports, these data demonstrated that cigarette smoke induce peroxidation of stratum corneum skin lipids. Conclusively, we suggest that anti-pollution effect of the cosmetics product containing red beet is beneficial to prevent the oxidation of skin lipids by atmospheric pollution.

  • https://doi.org/10.15230/SCSK.2018.44.2.111 인용 PDF KSCI

Overproduction of Pseudomonas sp. LBC505 Endoglucanase in Escherichia coli and Bacillus subtilis

  • CHUNG, YOUNG-CHUL;KYEONG-SOOK KIM;YANG-WOO KIM;SUNG-SIK CHUN;NACK-KIE SUNG
    • Journal of Microbiology and Biotechnology
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    • v.5 no.1
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    • pp.18-21
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    • 1995

  • Endoglucanase gene of Pseudomonas sp. LBC505 was previously cloned in pUCl9 to yield plasmid pLC1. overproduction of endoglucanase was attempted by following ways. First, the endoglucanase gene of Pseudomonas sp. LBC505 cloned in pUCl9(pLC1) was tandemly inserted, step by step, into a expression vector pKK223-3 in a directly repeated form to enhance productivity of endoglucanase. Escherichia coli containing pKCC30 among the resulting plasm ids showed the higher yield of the endoglucanase. Ecoli harboring pKCC30 which had three inserted endoglucanase genes expressed about 12.3 times as much CMCase activity as Ecoli harboring pLCl. Second, the endoglucanase gene was subcloned into Bacillus subtilis expression vector pgnt41 for both overproduction and extracellular secretion of the endoglucanase. A resulting plasmid pgntc15 in Bacillus subtilis expressed 4.3-fold higher levels of CMCase activity than that of E.coli harboring pLCl and the endoglucanase produced was entirely secreted into the culture medium.

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