• Title/Summary/Keyword: Brain Korea 21

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Effect of the LiF anode interfacial layer on polymer light emitting diodes

  • Sohn, Sun-Young;Lee, Dae-Woo;Park, Keun-Hee;Jung, Dong-Geun;Kim, H.M.;Manna, U.;Yi, J.
    • 한국정보디스플레이학회:학술대회논문집
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    • 2005.07b
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    • pp.1056-1058
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    • 2005
  • Electrical and optical characteristics of MEH-PPV-based PLEDs with the LiF anode interfacial layer were investigated. The maximum luminance efficiency of the device with a LiF anode interfacial layer of 1-nm-thick was 3.0 lm/W, which is higher than 1.97 lm/W of the device without a LiF layer. By inserting LiF, excess injected holes from ITO anode can be blocked and hence the recombination ratio of electrons and holes can be increased in the emitting layer to improve device efficiency.

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Synthesis and Antibacterial Activity of Novel 2-Oxo-pyrrolidinyl Oxazolidinones

  • Bhattarai, Deepak;Lee, Sun-Hee;Kim, Hyeong-Kyu;Kang, Soon-Bang;Pae, Ae-Nim;Kim, Eunice Eun-Kyeong;Oh, Taeg-Won;Cho, Sang-Nae;Keum, Gyo-Chang
    • Bulletin of the Korean Chemical Society
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    • v.33 no.4
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    • pp.1310-1316
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    • 2012
  • Novel antibacterial oxazolidinones bearing pyrrolidinone ring system at the C-5 side chain were synthesized and their in vitro antibacterial activities were evaluated. Most of the synthesized oxazolidinones showed good antibacterial activity against the Gram-positive and Gram-negative bacteria tested.

Age- and Area-Dependent Distinct Effects of Ethanol on Bax and Bcl-2 Expression in Prenatal Rat Brain

  • Lee, Hae-Young;Naha, Nibedita;Kim, Jong-Hun;Jo, Mi-Ja;Min, Kwan-Sik;Seong, Hwan-Hoo;Shin, Dong-Hoon;Kim, Myeong-Ok
    • Journal of Microbiology and Biotechnology
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    • v.18 no.9
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    • pp.1590-1598
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    • 2008
  • Cell proliferation and differentiation are critical processes in a developing fetal rat brain, during which programmed cell death (PCD) also plays an important role. One of the decisive factors for PCD is Bcl-2 family proteins, where Bax induces cell death, whereas Bcl-2 acts as an inhibitor of PCD. As maternal drinking is known to cause fetal alcohol syndrome (FAS) or malformation of the fetal brain during pregnancy, the objective of the present study was to investigate whether maternal ethanol exposure alters the PCD-related Bax and Bcl-2 protein expression during fetal brain development. Pregnant female rats were orally treated with 10% ethanol and the subsequent expressions of the Bax and Bcl-2 proteins examined in the fetal brain, including the forebrain, midbrain, and hindbrain, from gestational day (GD) 15.5 to GD 19.5, using Western blots, in situ hybridization, and immunohistochemistry. With regard to the ratio of Bcl-2 to Bax proteins (Bcl-2/Bax), the Bax protein was dominant in the forebrain and midbrain of the control GD 15.5 fetuses, except for the hindbrain, when compared with the respective ethanol-treated groups. Moreover, Bcl-2 became dominant in the midbrain of the control GD 17.5 fetuses when compared with the ethanol-treated group, representing an alternation of the natural PCD process by ethanol. Furthermore, a differential expression of the Bcl-2 and Bax proteins was found in the differentiating and migrating zones of the cortex, hippocampus, thalamus, and cerebellum. Thus, when taken together, the present results suggest that ethanol affects PCD in the cell differentiation and migration zones of the prenatal rat brain by modulating Bax and Bcl-2 expression in an age- and area-dependent manner. Therefore, this is the first evidence that ethanol may alter FAS-associated embryonic brain development through the alteration of Bax and Bc1-2 expression.