http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Park, Changwon,Kim, Sung Wng,Yoon, Mina American Physical Society 2018 Physical Review Letters Vol.120 No.2
<P>We introduce a new class of electrides with nontrivial band topology by coupling materials database searches and first-principles-calculations-based analysis. Cs3O and Ba3N are for the first time identified as a new class of electrides, consisting of one-dimensional (1D) nanorod building blocks. Their crystal structures mimic beta-TiCl3 with the position of anions and cations exchanged. Unlike the weakly coupled nanorods of beta-TiCl3, Cs3O and Ba3N retain 1D anionic electrons along the hollow interrod sites; additionally, a strong interrod interaction in Cs3O and Ba3N induces band inversion in a 2D superatomic triangular lattice, resulting in Dirac-node lines. The new class of electrides can serve as a prototype for new electrides with a large cavity space that can be utilized for various applications such as gas storage, ion transport, and metal intercalation.</P>
Injury-Mediated Vascular Regeneration Requires Endothelial ER71/ETV2
Park, Changwon,Lee, Tae-Jin,Bhang, Suk Ho,Liu, Fang,Nakamura, Rei,Oladipupo, Sunday S.,Pitha-Rowe, Ian,Capoccia, Benjamin,Choi, Hong Seo,Kim, Tae Min,Urao, Norifumi,Ushio-Fukai, Masuko,Lee, Dongjun,Mi American Heart Association, Inc. 2016 Arteriosclerosis, thrombosis, and vascular biology Vol.36 No.1
<P>Objective Comprehensive understanding of the mechanisms regulating angiogenesis might provide new strategies for angiogenic therapies for treating diverse physiological and pathological ischemic conditions. The E-twenty six (ETS) factor Ets variant 2 (ETV2; aka Ets-related protein 71) is essential for the formation of hematopoietic and vascular systems. Despite its indispensable function in vessel development, ETV2 role in adult angiogenesis has not yet been addressed. We have therefore investigated the role of ETV2 in vascular regeneration. Approach and Results We used endothelial Etv2 conditional knockout mice and ischemic injury models to assess the role of ETV2 in vascular regeneration. Although Etv2 expression was not detectable under steady-state conditions, its expression was readily observed in endothelial cells after injury. Mice lacking endothelial Etv2 displayed impaired neovascularization in response to eye injury, wounding, or hindlimb ischemic injury. Lentiviral Etv2 expression in ischemic hindlimbs led to improved recovery of blood perfusion with enhanced vessel formation. After injury, fetal liver kinase 1 (Flk1), aka VEGFR2, expression and neovascularization were significantly upregulated by Etv2, whereas Flk1 expression and vascular endothelial growth factor response were significantly blunted in Etv2-deficient endothelial cells. Conversely, enforced Etv2 expression enhanced vascular endothelial growth factor-mediated endothelial sprouting from embryoid bodies. Lentiviral Flk1 expression rescued angiogenesis defects in endothelial Etv2 conditional knockout mice after hindlimb ischemic injury. Furthermore, Etv2(+/-); Flk1(+/-) double heterozygous mice displayed a more severe hindlimb ischemic injury response compared with Etv2(+/-) or Flk1(+/-) heterozygous mice, revealing an epistatic interaction between ETV2 and FLK1 in vascular regeneration. Conclusions Our study demonstrates a novel obligatory role for the ETV2 in postnatal vascular repair and regeneration.</P>
Park, Seonghwan,Kim, Jeongmi,Park, Younghyun,Son, Suyoung,Cho, Sunja,Kim, Changwon,Lee, Taeho Elsevier 2017 Bioresource technology Vol.234 No.-
<P><B>Abstract</B></P> <P>Two competitive strategies, fed-batch and sequencing-batch cultivation, were compared in cost-effective biomass production of a high lipid microalgae, <I>Micractinium inermum</I> NLP-F014 using a blended wastewater medium. For fed-batch cultivations, additional nutrient was supplemented at day 2 (FB1) or consecutively added at day 2 and 4 (FB2). Through inoculum size test, 1.0g-DCWL<SUP>−1</SUP> was selected for the sequencing-batch cultivation (SB) where about 65% of culture was replaced with fresh medium every 2days. Both fed-batch cultivations showed the maximum biomass productivity of 0.95g-DCWL<SUP>−1</SUP> d<SUP>−1</SUP>, while average biomass productivity in SB was slightly higher as 0.96±0.08g-DCWL<SUP>−1</SUP> d<SUP>−1</SUP>. Furthermore, remained concentrations of organics (426mg-CODL<SUP>−1</SUP>), total nitrogen (15.4mg-NL<SUP>−1</SUP>) and phosphorus (0.6mg-PL<SUP>−1</SUP>) in SB were much lower than those of fed-batch conditions. The results suggested that SB could be a promising strategy to cultivate <I>M. inermum</I> NLP-F014 with the blended wastewater medium.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A valuable strategy for cost-effective production of <I>M. inermum</I> was determined. </LI> <LI> Two batch cultivation strategies, fed-batch and sequencing-batch mode, were tested. </LI> <LI> Culture medium was a mixture of domestic WW and aerobically digested swine WW. </LI> <LI> The highest biomass productivity was obtained from the sequencing-batch mode. </LI> <LI> The sequencing-batch mode also showed low environmental impacts. </LI> </UL> </P>
Park, Changwon,Atalla, Viktor,Smith, Sean,Yoon, Mina American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.32
<P>Charge transfer between an electron donor and an electron acceptor is widely accepted as being independent of their relative configurations if the interaction between them is weak; however, the limit of this concept for an interacting system has not yet been well established. Our study of prototypical electron donor–acceptor molecules, tetrathiafulvalene–tetracyanoquinodimethane, using density functional theory based on an advanced functional, clearly demonstrates that for interacting molecules, their configurational arrangement is as important as their individual electronic properties in the asymptotic limit to determine the charge transfer direction. For the first time, we demonstrate that by changing their relative orientation, one can reverse the charge transfer direction of the pair, causing the molecules to exchange roles as donor and acceptor. Our theory has important implications for understanding the interfacial charge-transfer mechanism of hybrid systems and related phenomena.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2017/aamick.2017.9.issue-32/acsami.7b04148/production/images/medium/am-2017-04148e_0002.gif'></P>