• Title/Summary/Keyword: C3H

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Isolation and Structure Determination of Two Furanosesquiterpenes from the Soft Coral Sinularia lochmodes (산호로부터 2개의 푸란노세스키테르펜의 분리와 구조 결정)

  • Park, Seon Gu;Paul J. Scheuer
    • Journal of the Korean Chemical Society
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    • v.38 no.10
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    • pp.749-752
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    • 1994
  • Two furanosesquiterpenes, (5'E)-5-(2',6'-dimethylocta-5',7'-dienyl) furan-3-carboxylic acid (1) and (1'E,5'E)-5-(2',6'-dimethylocta-l',5',7'-trienyl) furan-3-carboxylic acid (2), were isolated from soft coral Sinularia lochmodes collected from Palikir pass at Pohnpei Micronesia, June, 1990 in Hawaii. Their structures were elucidated by $^1H$, $^{13}C$ NMR, Homo-COSY, $^1H$-$^{13}C$ (1 bond) Heteronuclear Multiple Quantum Coherence Spectroscopy (HMQC), $^1H$-$^{13}C$ (2 and 3 bond) Heteronuclear Multiple Bond Coherence Spectroscopy (HMBC), Electron Impact Mass Spectroscopy (EI-ms), and Infrared Spectroscopy (IR).

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Kinetics and Dynamics on Inhibition Effect of Chlorinated Hydrocarbon in Combustion Reaction: The Inhibition Effect of $CH_3Cl$ on the Ignition of $C_2H_6$ (염소계 탄화수소의 연소 억제 효과에 관한 반응속도 및 동력학 연구: $C_2H_6$ 점화 과정에서 $CH_3Cl$ 억제 효과)

  • Shin, Kuan Su;Kang, Wee Kyung;Shim, Seung Bo;Jee, Sung Bae
    • Journal of the Korean Chemical Society
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    • v.43 no.2
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    • pp.150-155
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    • 1999
  • The ignition delay times behind reflected shock waves in $C_2H_6-O_2-Ar$ systems containing $CH_3Cl$ were measured for the range of temperatures between 1270 and 1544 K. The measurements indicated that $CH_3Cl$ inhibited the ignition of ethane ignition and the inhibition effects increased with increasing $CH_3Cl$ concentration. To clarify the inhibition effects of $CH_3Cl$ from the viewpoint of the reaction mechanism, computational analyses were performed in $C_2H_6-CH_3CI-O_2-Ar$ mixtures.

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Protective Effect of Cyanidin-3-glucoside, the Major Component of Rubus fruticosus L. Mutants by Irradiation, on H2O2-induced Oxidative Damage in HepG2 Cells (방사선 돌연변이 블랙베리 주성분 Cyanidin-3-glucoside의 과산화수소 유발 산화적 손상에 대한 세포 보호 효과)

  • Cho, Byoung Ok;So, Yangkang;Lee, Chang Wook;Jin, Chang Hyun;Yook, Hong Sun;Jeong, Il Yun
    • Journal of Radiation Industry
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    • v.8 no.1
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    • pp.35-42
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    • 2014
  • This study was conducted to analyze the protective capacity of cyanidin-3-glucoside (C3G), which is rich in mulberry and blackberry as an anthocyanin pigment. In this study, we found that treatment with C3G significantly reduced ROS production in hydrogen peroxide $(H_2O_2)-treated$ HepG2 cells in a dose-dependent manner. In addition, treatment with C3G significantly increased the cell viability in a dose-dependent manner in $H_2O_2-treated$ HepG2 cells. Moreover, treatment with C3G dose-dependently decreased the release of LDH and activation of caspase-3 in HepG2 cells treated with $H_2O_2$. Furthermore, the DNA damage in $H_2O_2-treated$ HepG2 cells was decreased by C3G treatment when compared with the control group in a dose-dependent manner. Additionally, treatment with C3G recovered the activity of antioxidant enzymes such as superoxide dismutase and catalase in $H_2O_2-treated$ HepG2 cells. To summarize, these results suggest that C3G protects cells from $H_2O_2-induced$ oxidative damage by activating antioxidant enzymes.

Growth characteristics of 4H-SiC homoepitaxial layers grown by thermal CVD

  • Jang, Seong-Joo;Jeong, Moon-Taeg;Seol, Woon-Hag;Park, Ju-Hoon
    • Journal of the Korean Crystal Growth and Crystal Technology
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    • v.9 no.3
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    • pp.303-308
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    • 1999
  • As a semiconductor material for electronic devices operated under extreme environmental conditions, silicon carbides(SiCs) have been intensively studied because of their excellent electrical, thermal and other physical properties. The growth characteristics of single-crystalline 4H-SiC homoepitaxial layers grown by a thermal chemical vapor deposition (CVD) were investigated. Especially, the successful growth condition of 4H-SiC homoepitaxial layers using a SiC-uncoated atmospheric pressure chamber and carried out using off-oriented substrates prepared by a modified Lely method. In order to investigate the crystallinity of grown epilayers, Nomarski optical microscopy, Raman spectroscopy, photoluninescence(PL), scanning electron microscopy(SEM) and other techniques were utilized. The best quality of 4H-SiC homoepitaxial layers was observed in conditions of growth temperature $1500^{\circ}C$ and C/Si flow ratio 2.0 of $C_{3}H_{8}\;0.2\;sccm\;&\;SiH_{4}\;0.3\;sccm$. The growth rate of epilayers was about $1.0\mu\textrm{m}/h$ in the above growth condition.

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The Control of SiC/C Ratio for the Synthesis of SiC/C Functionally Gradient Materials (SiC/C 경사기능재료(FGM)의 합성을 위한 SiC/C 분율 조절)

  • 김유택;최준태;최종건;오근호
    • Journal of the Korean Ceramic Society
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    • v.32 no.6
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    • pp.685-696
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    • 1995
  • The most important techniques in the synthesis of SiC/C function gradient material (FGM) are to control the SiC/C ratio and to obtain the moderate deposition rate. For these, various gas systems and flow rates were attempted and evaluated. It turned out that the CH4+SiCl4+H2 system was suitable for the deposition of SiC-rich layers, the C3H8+SiCl4+Ar system for the deposition of carbon-rich layers, and the C3H8+SiCl4+H2+Ar system was good to deposit the layers between them.

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Low-Power H.264 Decoder Design for Digital Multimedia Broadcasting (디지털 멀티미디어 방송을 위한 저전력 H.264 복호기 설계)

  • Lee, Seong-Soo;Lee, Won-Cheol
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.44 no.1
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    • pp.62-68
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    • 2007
  • H.264 video compression in digital multimedia broadcasting (DMB) shows significantly high compression ratio over conventional algorithms, while its required hardware cost and power consumption are also $3{\sim}5$ times larger. Consequently, low-hardware-cost and low-power H.264 decoder SoC is essential for commercial digital multimedia broadcasting terminals. This paper describes low-power design and implementation of core blocks in H.264 decoder SoC.

Positive Regulator, a Rice C3H2C3-type RING Finger Protein H2-3(OsRFPH2-3), in Response to Salt Stress

  • Min Seok Choi;Cheol Seong Jang
    • Proceedings of the Korean Society of Crop Science Conference
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    • 2023.04a
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    • pp.156-156
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    • 2023
  • Salinity is a major abiotic stress that limits rice productivity in many regions of the world. In order to develop salt stress tolerant rice plants, genetic engineering is a promising approach. We characterized the molecular function of rice C3H2C3 as a really interesting new gene (RING). Oryza sativa RING finger protein H2-3 (OsRFPH2-3) was highly expressed in 100 mM NaCl. To identify the localization of OsRFPH2-3, we fused vectors that include C-terminal GFP protein (35S;;OsRFPH2-3-GFP). OsRFPH2-3 was expressed in the nucleus in rice protoplasts. An in vitro ubiquitin assay demonstrated that OsRFPH2-3 possessed E3-ubiquitin ligase activity. However, the mutated OsRFPH2-3 were not possessed any E3-ubiquitin ligase activity. Under salinity conditions, OsRFPH2-3-overexpressing plants exhibited higher chlorophyll, proline, SOD, POD, CAT, and soluble sugar contents and lower H2O2 accumulation than wild-type plants, supporting transgenic plants with enhanced salinity tolerance phenotypes. OsRFPH2-3-overexpressing plants exhibited low Na+ accumulation and Na+/K+ ratios in their roots. Theses results suggest that overexpression of OsRFPH2-3 can make plant insensitivity about salinity conditions.

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The Crystal and Molecular Structure of Fenothiocarb, $C_{13}H_{19}NO_2S$. (Fenothiocarb, $C_{13}H_{19}NO_2S$의 결정 및 분자구조)

  • 박권일;조성일
    • Korean Journal of Crystallography
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    • v.6 no.2
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    • pp.63-68
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    • 1995
  • The crystal structure of fenothiocarb(S-4-phenoxybutyl dimethylthiocarbamate), C13H19NO2S is monoclinic, space group P21/c, a=9.045(1)Å, b=14.577(2)Å, c=10.727(2)Å, β=103.56(1)°, Z=4, V=1375.20(6)Å3, Dc=1.23g/cm3, λ(Mo-Kα)=0.71069Å, μ=2.3cm-1, F(000)=544, temperature : 293±3K, R=0.049 for 1543 unique observed reflections. The structure was determined by direct method and refined by full-matrix least squares method. The molecules are contacted to the c axis with two fold screw and van der Waales force.

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The Crystal Structure of Fluoxymesterone, $C_{20}H_{29}FO_3$ (Fluoxymesterone, $C_{20}H_{29}FO_3$의 결정구조)

  • Kim, Ui-Seong;Park, Gwon-Il;Jo, Seong-Il
    • Korean Journal of Crystallography
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    • v.4 no.1
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    • pp.6-10
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    • 1993
  • 11 β ,17 β -dihydroxy-9a-fluoro-l7a-methyl androst-4-en-3-one (Fluoxymesterone), CgoH29 FO,, orthorhombic, P2,2,2,, a=13.468(5) A, b= 19.554 (2)A, c=6.578(9)A, a=b=r=90˚, A (CuKa)=1.5406 A , Dm=1.289cm-3, Dc=1.299cm-3 and Z=4 at T=298k. The structure was solved by direct method using seminvariants of ggg Parity group and refined by the full-matrix least-square method, resulting model with reliability factor R=0.069 for 1098 unique reflection over 3σ . Ring A is an 1β-2a-half chair, 5 ring has a highly symmetrical chair conformation, C ring is in a distorted chair conformation and D ring is a 13aenveLope conformation. In the crystal structure, the molecules are packed with a hydrogen bond of 011-H23‥‥03(0.5+x, 1.5-y, 1.0-z) [1.94(9) A of H‥‥0.2.786(9)A of 0‥‥0 and 165(8) ˚ of

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Study on the Latent Heat Characteristics of the Organic Compound, $C_{28}H_{58}$ and the Inorganic Compound, $CH_3COONa{\cdot}3H_2O$ (유기잠열재, $C_{28}H_{58}$과 무기잠열재, $CH_3COONa{\cdot}3H_2O$의 잠열특성연구)

  • Song, Hyun-Kap;Ryou, Young-Sun
    • Solar Energy
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    • v.11 no.3
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    • pp.53-61
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    • 1991
  • In this research, Octacosane($C_{28}H_{58}$) and Sodium Acetate Trihydrate($CH_3COONa{\cdot}3H_2O$) were selected as latent heat storage materials to store off-peak electricity or waste heat of an industrial plant. Experimental analyses were performed in terms of the variation of phase change temperature and latent heat, phase change stability for the long term utilization. The results were as follows. 1. The phase change temperatures of industrial grade Octacosane and Sodium Acetate Trihydrate were $60.7^{\circ}C$ and $57.4^{\circ}C$, the latent heat were 60.6kcal/kg and 51.1kcal/kg respectively. 2. The latent heat quantity of Octacosane was decreased with the increasing number of phase change cycles. It decreased from 60.6kcal/kg to 47.2kcal/kg upto 200 cycles and then no variation was observed after 200 cycles. 3. To prevent the supercooling of Sodium Acetate Trihydrate, the nucleating agent, Sodium Pyrophosphate Decahydrate of 3 wt% was added, and then the supercooling temperature (Tm-Tsc) was decreased from $25.7^{\circ}C$ to $1^{\circ}C$. The phase separation was disappeared by the addition of CMC-Na of 3 wt% as a thickener. It was found that the optimal quantity of nucleating agent and thickener was 4wt% considering the stability of SAT as a latent heat storage material. 4. The phase change temperature of Sodium Acetate Trihydrate($CH_3COONa{\cdot}3H_2O$) was adjusted from 57.4 to $46.2^{\circ}C$ by the addition of UREA. And then the latent heat quantity was decreased from 51.1 to 38.3kcal/kg. 5. When the heat storage capacities between the sensible and latent heat storage materials were analyzed and compared in heating process from 30 to $90^{\circ}C$, the heat storage capacity of Octacosane was 2.45 times larger than water and 12.5 times than granite at $60.7^{\circ}C$, and the heat storage capacity of Sodium Acetate Trihydrate was 2.53 times larger than water and 12.91 times than granite at $57.4^{\circ}C$.

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