http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Shimizu, Tomoko K.,Jung, Jaehoon,Otani, Tetsuya,Han, Young-Kyu,Kawai, Maki,Kim, Yousoo American Chemical Society 2012 ACS NANO Vol.6 No.3
<P>A two-dimensional fluorinated fullerene (C<SUB>60</SUB>F<SUB>36</SUB>) superstructure has been successfully formed on Au(111) and was investigated using scanning tunneling microscopy (STM) and density functional theory calculations. Although there exist three isomers (<I>C</I><SUB>3</SUB>, <I>C</I><SUB>1</SUB>, and <I>T</I>) in our molecular source, STM images of the molecules in the well-ordered region all appear identical, with 3-fold symmetry. This observation together with the differences in the calculated lowest unoccupied molecular orbital (LUMO) distribution among the three isomers suggests that a well-ordered monolayer consists of only the <I>C</I><SUB>3</SUB> isomer. Because of the strong electron-accepting ability of C<SUB>60</SUB>F<SUB>36</SUB>, the adsorption orientation can be explained by localized distribution of its LUMO, where partial electron transfer from Au(111) occurs. Intermolecular C–F···π electrostatic interactions are the other important factor in the formation of the superstructure, which determines the lateral orientation of C<SUB>60</SUB>F<SUB>36</SUB> molecules on Au(111). On the basis of scanning tunneling spectra obtained inside the superstructure, we found that the LUMO is located at 1.0 eV above the Fermi level (<I>E</I><SUB>F</SUB>), while the highest occupied molecular orbital (HOMO) is at 4.6 eV below the <I>E</I><SUB>F</SUB>. This large energy gap with the very deep HOMO as well as uniform electronic structure in the molecular layer implies a potential for application of C<SUB>60</SUB>F<SUB>36</SUB> to an electron transport layer in organic electronic devices.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2012/ancac3.2012.6.issue-3/nn300064x/production/images/medium/nn-2012-00064x_0009.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn300064x'>ACS Electronic Supporting Info</A></P>
Sakurai, Takeo,Kobayashi, Jun,Kinoshita, Kyoko,Ito, Nozomi,Serizawa, Shigeko,Shiraishi, Hiroaki,Lee, Jeong-Hoon,Horiguchi, Toshihiro,Maki, Hideaki,Mizukawa, Kaoruko,Imaizumi, Yoshitaka,Kawai, Toru,Suz Wiley Periodicals 2013 Environmental toxicology and chemistry Vol.32 No.9
<P>The authors investigated the kinetics of transfer of perfluorooctane sulfonate (PFOS) from water, suspended sediment, and bottom sediment to a marine benthic fish, the marbled flounder (<I>Pseudopleuronectes yokohamae</I>). Fish were exposed in 3 treatments to PFOS in combinations of these exposure media for 28 d and then depurated for 84 d. A major part (37–66%) of PFOS in the fish was in the carcass (i.e., whole body minus muscle and internal organs). Three first-order-kinetic models that differed in exposure media, that is, 1) sum of dissolved and particulate phases and sediment; 2) dissolved phase, particulate phase, and sediment; and 3) dissolved phase only, were fitted to the data assuming common rate constants among the treatments. The uptake efficiency of dissolved PFOS at the respiratory surfaces was estimated to be 3.2% that of oxygen, and the half-life of PFOS in the whole body to be 29 d to 31 d. The better fit of models 1 and 2 and the values of the estimated uptake rate constants suggested that the PFOS in suspended and bottom sediments, in addition to that dissolved in water, contributed to the observed body burden of the fish. Based on an evaluation of several possible contributing factors to the uptake of PFOS from suspended and bottom sediments, the authors propose that further investigation is necessary regarding the mechanisms responsible for the uptake. <I>Environ Toxicol Chem</I> 2013;32:2009–2017. © 2013 The Authors. <I>Environmental Toxicology and Chemistry</I> Published by Wiley Periodicals, Inc., on behalf of SETAC. This is an open access article under the terms of the Creative Commons Attribution Non-Commercial License, which permits use, distribution, and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.</P>
Mammalian Bax initiates plant cell death through organelle destruction
Yoshinaga, Keiko,Arimura, Shin-ich,Hirata, Aiko,Niwa, Yasuo,Yun, Dae-Jin,Tsutsumi, Nobuhiro,Uchimiya, Hirofumi,Yamada, Maki Kawai Plant molecular biology and biotechnology research 2005 Plant molecular biology and biotechnology research Vol.2005 No.
Mammalian Bax is known to cause cell death when expressed in plants. We examined transgenic plants expressing both Bax and oraganelle-targeted green fluorescent protein to determine the cellular changes that occur during Bax-induced cell death. The mitochondria changed morphologically from being bacilli-shaped to being round, eventually becoming swollen. Mitochondria streaming also stopped. The chloroplasts lost membrane function and their contents leaked out, followed by the disruption of the vacuole. Light was not essential for Bax-induced ion leakage or organelle disruption. These results indicate that Bax-induces temporal and spatial cell death events at the organelle level in the plant. A heterologous system, using Bax, would therefor be available to investigate cell death, which is commonly conserved in animals and plants
One-Dimensional Molecular Zippers
Kim, Hyo Won,Jung, Jaehoon,Han, Mina,Lim, Seongjoon,Tamada, Kaoru,Hara, Masahiko,Kawai, Maki,Kim, Yousoo,Kuk, Young American Chemical Society 2011 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.133 No.24
<P>We synthesized an azobenzene derivative to demonstrate a one-dimensional molecular zipper. The formation and underlying mechanism of the molecular zipper formed by combined hydrogen-bonding and van der Waals interactions between adjacent molecules were investigated on a Au(111) surface using scanning tunneling microscopy and density functional theory calculations.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jacsat/2011/jacsat.2011.133.issue-24/ja2031486/production/images/medium/ja-2011-031486_0003.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja2031486'>ACS Electronic Supporting Info</A></P>