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The role of water channel proteins and nitric oxide signaling in rice seed germination

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Cell Research 2007年第7期17卷 638-649页

作者： Sang-Soo Kwak Korea Research Institute of Bioscience and Biotechnology Oun-dong 52 yusong Taejon 305-333 South Korea

Previous studies have demonstrated the possible role of several aquaporins in seed germination. But systematic inves-tigation of the role of aquaporin family members in this process is lacking. Here, the developmental regulation of plasmamembrane intrinsic protein (PIP) expression throughout germination and post-germination processes in rice embryoswas analyzed. The expression patterns of the PIPs suggest these aquaporins play different roles in seed germination andseedling growth. Partial silencing of the water channel genes, OsPIP1;1 and OsPIP1;3, reduced seed germination whileover-expression of OsPIP1;3 promoted seed germination under water-stress conditions. Moreover, spatial expressionanalysis indicates that OsPIP1;3 is expressed predominantly in embryo during seed germination. Our data also revealedthat the nitric oxide (NO) donors, sodium nitroprusside (SNP) and S-nitrosoglutathione (GSNO), promoted seed germi-nation; furthermore, the NO scavenger, 2-(4-carboxyphenyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide, inhibitedgermination and reduced the stimulative effects of SNP and GSNO on rice germination. Exogenous NO stimulated thetranscription of OsPIP1;1, OsPIP1;2, OsPIP1;3 and OsPIP2;8 in germinating seeds. These results suggest that waterchannels play an important role in seed germination, acting, at least partly, in response to the NO signaling pathway.

关键词： germination nitric oxide Oryza sativa over-expression silencing water channel

Adaptation of Cu/ZnO/Al_2O_3 to Temperature Change in Methanol Synthesis from CO_2 Hydrogenation

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Journal of Natural Gas Chemistry 2002年第1期11卷 63-69页

作者： JialinTao Ki－WonJun 等 ChemicalTechnologyLab 1KoreaResearchInstituteofChemicalTechnologyP.O.Box107YusongTaejon305－600Korea ChemicalTechnologyLab 1KoreaResearchInstituteofChemicalTechnologyP.O.Box107YusongTaejon305－

The induction behavior in CO2 hydrogenation was studied by varying the reaction temperature to investigate the adaptation of the Cu/ZnO/Al2O3 catalyst to the temperature change. The results indicated that a used catalyst had a tendency to keep the last running state in new reaction conditions for MeOH formation, and that this tendency was related to the difference in Cu/Cun+ ratio caused by CO2 and CO produced at different reaction temperatures. However, the reverse water-gas shift reaction (RWGS) induced at four temperatures was completely different from that of methanol synthesis. It implied that the two so-called competitive reactions in CO2+H2, RWGS and methanol synthesis, have different active centers.

关键词： induction Cu/ZnO/Al_2O_3 catalyst methanol adaptation

Vertically Integrated Thermo-Optic Waveguide Switch Using Optical Polymers

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光学学报 2003年第S1期23卷 359-360页

作者： Ki-Hong Kim Sang-Yung Shin Doo-Sun Choi Dept. of EECS Korea Advanced Institute of Science and Technology 373-1 Kusong-dong Yusong-gu Daejeon Republic of Korea.Dept. of EECS Korea Advanced Institute of Science and Technology 373-1 Kusong-dong Yusong-gu Daejeon Republic of Korea.Dept of. Intelligence and precision machine Korea Institute of Machinery and Materials 171 Jang-dong Yusong-gu Daejeon Republic of Korea.

We propose and fabricate a vertically integrated thermo-optic waveguide switch. It controls the optical path between two vertically stacked waveguides using the thermo-optic effect of optical polymer. The measured cro... 详细信息

关键词： mode in heat it than Vertically Integrated Thermo-Optic Waveguide Switch Using Optical Polymers of

LiNbO_3 Self-Aligned Ridge Waveguide with Dielectric Side Buffers

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光学学报 2003年第S1期23卷 211-212页

作者： Young-Bo Cho Hyung-Gi Jung Sang-Yung Shin Dept. EECS Korea Advanced Institute of Science and Technology 373-1 Kusong-dong Yusong-gu Dae jeon. Republic of KoreaDept. EECS Korea Advanced Institute of Science and Technology 373-1 Kusong-dong Yusong-gu Dae jeon. Republic of KoreaDept. EECS Korea Advanced Institute of Science and Technology 373-1 Kusong-dong Yusong-gu Dae jeon. Republic of Korea

A simple fabrication method of self-aligned ridge waveguides with dielectric side buffers is demonstrated on +Z-cut LiNbO3. The ridge waveguide is fabricated by a combination of the annealed proton exchange process an... 详细信息

关键词： with of it In is LiNbO3 Self-Aligned Ridge Waveguide with Dielectric Side Buffers have Cr for been APE length

Tm^(3+)-Doped Oxyfluoride Silicate Glasses for TDFA

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光学学报 2003年第S1期23卷 84-85页

作者： Doo-Hee Cho Hong-Seok Seo Bong-Je Park Yong-Gyu Choi Optical Communication Device Dept. Electronic and Telecommunication Research Institute 161 Kajong-dong Yusong-gu Daejon 305-350 Korea

The fluorine doping along with heavy metal oxides was remarkably raised the lifetime and the quantum efficiency of 3H4 in silicate glasses. The fluorine doping changed the local structure around Tm3+ ions, then low energy vibrations related to fluorine are considered to largely reduce the multi-phonon relaxation rates in the oxyfluoride silicate glasses.

关键词： quantum efficiency heavy metal

Directly Modulated 10 Gb/s Signal Transmission over 320 km of Negative Dispersion Fiber for Regional Metro Network

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光学学报 2003年第S1期23卷 533-534页

作者： H. S. Chung Y. G. Jang Y. C. Chung 1 Korea Advanced Institute of Science and Technology 373-1 Gusong-dong Yusong-gu Daejon 305-701 Korea2 Samsung Electronics 94-1 Imsudong Gumi KyungBuk 730-350 KoreaKorea Advanced Institute of Science and Technology 373-1 Gusong-dong Yusong-gu Daejon 305-701 Korea

We demonstrate the transmission of directly modulated 10-Gb/s WDM signals over 320 km of negative dispersion fiber (dispersion: -2.5 ps/km/nm @1550 nm) without dispersion compensation. The results indicate that a regional metro WDM network could be implemented cost-effectively by using the proposed negative dispersion fiber and direct modulated lasers.

关键词： of in et over Directly Modulated 10 Gb/s Signal Transmission over 320 km of Negative Dispersion Fiber for Regional Metro Network WDM for

Integrated On-line Instrumentation System of Magnetic Properties Measurement

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Journal of Materials Science & Technology 2000年第2期16卷 248-249页

作者： D.G.Park, Y.Y.Song. H.Song and J.H.Hong (Korea Atomic Energy Research Institute, yusong P.O.Box 105, Taejon, 305-600 Korea) C.G.Kim (Department of Physics, Sun Moon Univ., Asan-si, Chungnam, 336840 Korea) Korea Atomic Energy Research Institute Taejon 305-600 Yusong P.O.Box 105 South Korea Department of Physics Sun Moon Univ. Asan-si Chungnam 336-840 South Korea

A portable microcomputer-controlled inspection system has been developed for detection of magnetic properties of soft magnetic materials. It incorporates custom designed software for control of the magnetic field during operation such as demagnetization, field sweeping, and for data logging and analysis. Results are recorded using a 12-bit analog to digital converter and are then stored on disk. The magnetic hysteresis loop and Barkhausen noise data can be converted into important magnetic parameters: coecivity, remanence, and hysteresis loss, Barkhausen amplitude, and Barkhausen noise energy. This system incorporated with the magnetostriction, and magnetoacoustic emission, is then related with the nondestructive detection of material degradation.

关键词： line Integrated On-line Instrumentation System of Magnetic Properties Measurement

Alteration of the p53 gene during tree shrews' hepatocarcinogenesis

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Hepatobiliary & Pancreatic Diseases International 2003年第4期2卷 612-616页

作者： Young Ik Lee Bioscience Research Division Korea Research Institute of Bioscience and Biotechnology P. O. Box 115 Yusong Taejon 305-600 South Korea

OBJECTIVE: To detect the expression and variation of the p53 gene in hepatocarcinogenesis of tree shrews induced by hepatitis B virus (HBV) and aflatoxin B_1(AFB_1). METHODS: Tree shrews were divided into four groups: group A, infected with HBV and fed with AFB_1; group B, only infected with HBV; group C, fed with AFB_1 alone; and group D normal control. The tree shrews underwent liver biopsy every. 15 weeks. Liver and tumor tissues were detected by immunohistochemistry and molecular biotechnologies. RESULTS: The incidence of hepatocellular carcinoma (HCC) was higher in group A (66.7%) than in groups B (0) and C (30%). HCC occurrence was earlier in group A than in group C (120.0±16.6 wk vs 153.3±5.8 wk, t=3.336, P<0.01). Mutated p53 protein was not found in all groups before 75 weeks of experiment. At the 105th week, the expression rates of mutated p53 protein were 78.6%, 60.0% and 71.4% in groups A, B and C respectively, which were significantly higher than that in group D (10%) (X^2≥5.03, P<0.05). An abnormal band of the p53 gene was detected in groups A and C. The mutational points of the p53 gene in liver cancer of tree shrews were at codon 275, 78 and 13. Nucleotide sequence and amino acids sequence of tree shrew's wild-type p53 were 91.7% and 93.4% in homology, compared with those of human p53, respectively. CONCLUSIONS: Remarkable synergistic effect on HCC exists between HBV and AFB_1. Mutated p53 protein expressed before occurrence of HCC promotes the development of HCC. HBV and AFB_1 may synergistically induce p53 gene mutation.

关键词： hepatocellular carcinom gene p53 hepatitis B virus aflatoxin B_1 tree shrew

Compact Low-energy E-beam Irradiator

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Compact Low-energy E-beam Irradiator