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41.
KEE WOONG PARK SUNG HWAN CHOI JAE YOUNG AHN YOUNG GEOL SOHN CHANG‐GI KIM JEUNG JOO LEE 《Weed Biology and Management》2011,11(4):235-240
The herbicidal action of clove oil on cucumber seedlings was characterized under light and dark conditions. Paraquat showed herbicidal activity only under the light condition, whereas the clove oil displayed herbicidal activity in both the light and the dark condition. Specifically, wilting and water content reduction progressed rapidly under both the light and the dark condition 1 h after the clove oil treatment, whereas the paraquat damage occurred only under the light condition 5 h after treatment. The malondialdehyde concentration increased more with the clove oil treatment than with the paraquat treatment under the light and dark conditions. The superoxide dismutase (SOD) activity was stimulated, but the catalase activity decreased in the clove oil treatment. In contrast, both the SOD and catalase activity decreased in the paraquat treatment. These results suggest that clove oil exerts herbicidal effects through a mechanism that is different from that of paraquat. 相似文献
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Owing to unique structure and characteristic of carbon nanotubes, much more are attracted attentions since they were discovered .In recent years, carbon nanotubes have been successfully synthesized by various methods. Especially, highly aligned carbon nanotubes were grown by chemical vapor deposition (CVD). In the work, it is studied that different thickness of catalyst affects the diameters of carbon nanotubes. Carbon nanotubes were grown on silicon substrate coated with different thick NiFe films by bias-enhanced hot filament chemical vapor deposition and their growth was investigated by scanning electron microscopy,Onset of analyzing of deformation of different thick catalyst films during heating the filament. The results indicate that catalyst particles encapsulate the top ends of carbon nanotubes, and that the catalyst thickness greatly affects the diameters of carbon nanotubes, which increas with increment of the thickness of NiFe films. 相似文献
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Ji-Yei CHOI Jung-Taek KANG Sol-Ji PARK Su-Jin KIM Joon-Ho MOON Islam M. SAADELDIN Goo JANG Byeong-Chun LEE 《The Journal of reproduction and development》2013,59(5):450-456
One of the factors that impairs in vitro produced porcine embryos
is the oxidative stress that is mainly caused by the imbalance between reactive
oxygen species (ROS) generation and antioxidants activity, especially that of
glutathione (GSH). Here, we examined the effect of 7,8-dihydroxyflavone (7,8-DHF), a
kind of flavonoid antioxidant, on porcine oocyte maturation and its developmental
competence. Porcine oocytes were cultured in media supplemented with 0, 1, 5 and 10
μM 7,8-DHF during both in vitro maturation (IVM) and in
vitro culture (IVC) after parthenogenetic activation. Maturation of
oocytes was evaluated based on first polar body (PB) extrusion and intracellular GSH
level, and developmental competence was assessed through observing cleavage and
blastocyst formation. In each step, the levels of intracellular GSH and ROS were
assessed by fluorescence intensity, and the apoptosis-related gene expression was
examined using semiquantitative RT-PCR. The group treated with 1 μM 7,8-DHF during
IVM and IVC showed increased cytoplasmic maturation and reached the blastocysts stage
(36.1%) at a higher rate than the other groups (24.7, 16.0 and 10.3% for 0, 5 and 10
μM, P<0.05). In that group, the intracellular GSH level was significantly
increased while ROS generation was significantly decreased after IVM and IVC
(P<0.05). Moreover, it showed high expression of an anti-apoptotic gene
(BCL2L1) and low expression of a pro-apoptotic gene
(BAK1) (P<0.05). In conclusion, treatment with 1 μM 7,8-DHF
during IVM and IVC showed an anti-apoptotic effect by increasing intracellular GSH
synthesis and scavenging ROS and therefore improved the developmental competence of
porcine embryos. 相似文献
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We compare and analyze the total factor productivity of the manufacturing industries in the major metropolitan areas of South Korea, China, and Japan. This study can contribute to the economic cooperation among these countries by analyzing their productivity growth and evaluating their relative competitiveness. Statistical data from manufacturing industries are used to analyze five metropolitan areas. The manufacturing industries are classified into 10 sectors, and two different time periods (before and after 1997, when the foreign currency crisis began in Korea) are examined. The results in terms of the development and competitiveness of the manufacturing industries in Korea, China, and Japan will be useful in establishing promotional strategies. 相似文献
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