• Title/Summary/Keyword: Ge-Se

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Spectroscopic Ellipsometry of Si/graded-$Si_{1-x}Ge_x$/Si Heterostructure Films Grown by Reduced Pressure Chemical Vapor Deposition

  • Seo, J.J.;Choi, S.S.;Yang, H.D.;Kim, J.Y.;Yang, J.W.;Han, T.H.;Cho, D.H.;Shim, K.H.
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2006.06a
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    • pp.190-191
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    • 2006

  • We have investigated optical properties of Si/graded-$Si_{1-x}Ge_x$/Si heterostructures grown by reduced pressure chemical vapor deposition. Compared to standard condition using Si(100) substrate and growth temperature of $650^{\circ}C$, Si(111) resulted in low growth rate and high Ge mole fraction. Also samples grown at higher temperatures exhibited increased growth rate and reduced Ge mole fraction. The features regarding both substrate temperature and crystal orientation, representing high incorporation of silicon supplied from gas stream played as a key parameter, illustrate that reaction control were prevailed in this process growth condition. Using secondary ion mass spectroscopy and spectroscopic ellipsometry, microscopic changes in atomic components could be analyzed for Si/graded-$Si_{1-x}Ge_x$/Si heterostructures.

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Biosynthesis of Organic Germanium Using Cordyceps militaris (동충하초를 이용한 유기게르마늄의 생산)

  • Kim, Seung;Kim, Jae-Sung;Sapkota, Kumar;Choi, Bong-Suk;Park, Se-Eun;Park, Yeal;Chun, Hong-Sung;Yoo, Jin-Cheol;Choi, Han-Seok;Kim, Myung-Kon;Kim, Sung-Jun
    • The Korean Journal of Mycology
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    • v.34 no.2
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    • pp.84-87
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    • 2006

  • In the present study, an attempt has been made to produce a high quality medicinal mushroom Cordycops militaris supplemented with organic Ge. Cordycops militaris was cultivated in SDAY liquid medium containing yeast extract 10 g, peptone 10 g, glucose 40 g per liter and chrysalis media supplemented with inorganic Ge at 100, 500, 1000, and 5000 ppm concentrations. The greatest organic Ge production of 442.4 ppm/g and 284 ppm/g were observed in SDAY liquid and Chrysalis media cultures supplemented with 100 ppm inorganic Ge respectively. Similarly, 4,509.7 ppm/g and 1,058 ppm/g of organic Ge were obtained from liquid and chrysalis media cultures supplemented with 5,000 ppm and 1,000 ppm inorganic Ge, respectively. In addition, higher concentration of organic Ge was obtained in mycelia than fruiting bodies. These results indicate that the concentration of organic Ge increase with decreasing inorganic Ge concentration in the medium. This is the first report on production of high valuable Cordyceps militaris contained with organic Ge.

  • https://doi.org/10.4489/KJM.2006.34.2.084 인용 PDF KSCI