• Title/Summary/Keyword: MgB2

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A Study on the Composition of Sunflower Seed Sprout (Sunflower Seed Sprout의 성분조성에 관한 연구)

  • 이영근
    • Journal of the East Asian Society of Dietary Life
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    • v.9 no.1
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    • pp.74-80
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    • 1999

  • The proximate composition, pH, vitamins and minerals in sunflower seed sprout were investigated to furnish basic data for utilization in health food or processed food. The pH of sunflower seed sprout was 5.70. The contents of moisture, crude protein, crude fat, crude ash and crude fiber of sunflower seed sprout were 94.7%, 1.3%, 0.3%, 1.3% and 1.6%, respectively. The vitamin A, vitamin B$_1$, vitamin B$_2$, vitamin C and niacin contents in sunflower seed sprout were 114.411. U%, 0.06mg%, 0.05mg%. 5.90mg% and 0.80mg%, respectively. The contents of Ca, P, Fe, Na, K, Mn, Cu, Zn and Mg in sunflower seed sprout per 100g were 80.00mg, 4.85mg, 3.63mg, 8.25mg, 180.90mg, 1.35mg, 0.43mg, 1.85mgand 66.35mg, respectively. The crude ash and crude fiber content of sunflower seed sprout were 3 or 4 times higher than those in the sprout of radish seed, mung bean, soybean or alfalfa, respectively.

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Flux Pinning in $MgB_2$ Film with Columnar Grains (기둥형 결정립 구조를 지닌 $MgB_2$ 박막에서 자속고정 현상)

  • Kim, D.H.;Kim, H.Y.;Hwang, T.J.;Lee, S.H.;Seong, W.K.;Kang, W.N.
    • Progress in Superconductivity
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    • v.9 no.2
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    • pp.173-176
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    • 2008

  • [ $MgB_2$ ] films grown by hybrid physical chemical vapor deposition under appropriate growth conditions commonly exhibit columnar grain structure. The grain boundaries between adjacent columnar grains have been reported to be good flux pinning centers. In this work, we measured the angular dependence of critical current density ($J_c$) and observed the enhanced flux pinning when an external magnetic field was aligned parallel to the columnar direction. This $J_c$ was almost comparable to the $J_c$ for intrinsic pinning case up to 1 T at low temperatures, indicating that grain boundary pinning is very effective. At high fields, however, $J_c$ decreased rapidly resulting from the fact that the density of flux pinning centers provided by grain boundaries was outnumbered by the flux density.

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Antioxidant and tyrosinase inhibitory activity of white beech mushroom (Hypsizygus marmoreus) extracts (흰색 느티만가닥버섯 추출물의 항산화 활성 및 tyrosinase 저해 효과)

  • Kim, Su Cheol;Kim, Hye Soo;Cho, Soo Jeong
    • Journal of Mushroom
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    • v.16 no.4
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    • pp.324-330
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    • 2018

  • The objective of this study was to evaluate antioxidant effect and tyrosinase inhibitory activity of white beech mushroom (Hypsizygus marmoreus) extracts. The white beech mushroom was extracted into hot water and methanol. Total polyphenol content was highest in the hot water extract ($8.4{\pm}3.27mg\;GAE/g$) compared to the methanol extract ($7.3{\pm}2.85mg\;GAE/g$). The flavonoids contents in hot water and methanol extracts were $3.8{\pm}3.81ug/mg$ and $2.5{\pm}1.95ug/mg$, respectively. The tyrosinase inhibitory activity of extract was increased in a dose dependent manner and tyrosinase inhibitory activity of extract (hot water extract, 69.72%; methanol extract, 52.67% at 40 mg/ml) was lower than those of positive control 2% arbutin (96%). The DPPH radical scavenging activity of the hot water and methanol extract was 80% and 74%, respectively. Hot water extract ($63.34{\pm}1.00uM\;TE/g$) were more effective in ORAC (oxygen radical absorbance capacity) value than methanol extract ($46.33{\pm}0.48uM\;TE/g$). The toxicity of hot water and methanol extracts was investigated using WST-1 (4-[3-(4-iodophenyl)-2-(4-nitrophenyl)-2H-5-tetrazolio]-1,3-benzene disulphonate) assay on the B16BL6 melanoma cells.

  • https://doi.org/10.14480/JM.2018.16.4.324 인용 PDF KSCI HTML