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Lee, Kimoon,Oh, Min Suk,Mun, Sungx2010,jin,Lee, Kwang H.,Ha, Tae Woo,Kim, Jae Hoon,Park, Sangx2010,Hee Ko,Hwang, Chix2010,Sun,Lee, Byoung H.,Sung, Myung M.,Im, Seongil WILEY‐VCH Verlag 2010 Advanced Materials Vol.22 No.30
<P><B>Direct quantitative mapping of the density‐of‐states</B>, named the photo‐excited charge‐collection technique, for the interface traps at the n‐ZnO and/or p‐pentacene thin‐film transistor channel is implemented by using monochromatic photons which are carried by optical fibers and are probed onto thin‐film transistors. </P>
Kennerson, Marina L.,Kim, Eun J.,Siddell, Anna,Kidambi, Aditi,Kim, Sung M.,Hong, Young B.,Hwang, Sun H.,Chung, Ki W.,Choi, Byungx2010,Ok Wiley Periodicals, Inc. 2016 Journal of the peripheral nervous system Vol.21 No.1
<P><B>Abstract</B></P><P>Charcot‐Marie‐Tooth disease (CMT) is the most common inherited peripheral neuropathy. Mutations in the pyruvate dehydrogenase kinase isoenzyme 3 (<I>PDK3</I>) gene have been found to cause X‐linked dominant CMT type 6 (CMTX6). This study identified the p.R158H <I>PDK3</I> mutation after screening 67 probable X‐linked CMT families. The mutation fully segregated with the phenotype, and genotyping the family indicated the mutation arose on a different haplotype compared with the original Australian CMTX6 family. Results of bisulphite sequencing suggest that methylated deamination of a CpG dinucleotide may cause the recurrent p.R158H mutation. The frequency of the p.R158H <I>PDK3</I> mutation in Koreans is very rare. Magnetic resonance imaging revealed fatty infiltration involving distal muscles in the lower extremities. In addition, fatty infiltrations were predominantly observed in the soleus muscles, with a lesser extent in tibialis anterior muscles. This differs from demyelinating CMT1A patients and is similar to axonal CMT2A patients. The clinical, neuroimaging, and electrophysiological findings from a second CMTX6 family with the p.R158H <I>PDK3</I> mutation were similar to the axonal neuropathy reported in the Australian family.</P>
Park, Kyung Sun,Salunkhe, Sonali M.,Lim, Iseul,Cho, Cheonx2010,Gyu,Han, Sungx2010,Hwan,Sung, Myung Mo WILEY‐VCH Verlag 2013 Advanced Materials Vol.25 No.24
<P><B>A new indolocabazole derivative possessing an extended aromatic core and solubilizing long aliphatic chains</B> effectively self‐assembles and crystallizes within the nanoscale channels to form single‐crystal nanowires via a direct printing method from an ink solution. Single‐crystal organic nanowire transistor arrays based on the <I>π</I>‐extended indolocarbazole derivative exhibit an excellent hole mobility of 1.5 cm<SUP>2</SUP> V<SUP>−1</SUP> s<SUP>−1</SUP> and outstanding environmental stability.</P>
Gao, Yan,Yip, Hinx2010,Lap,Chen, Kungx2010,Shih,O’Malley, Kevin M.,Acton, Orb,Sun, Ying,Ting, Guy,Chen, Hongzheng,Jen, Alex K.x2010,Y. WILEY‐VCH Verlag 2011 Advanced Materials Vol.23 No.16
<P><B>Surface doping of conjugated polymers</B> is realized by depositing a thin layer of graphene oxide (GO) on top of the polymers. The high proton density and the unique 2D structure of GO facilitate the protonic surface doping of conjugated polymers to achieve high conductivities. This finding represents a new strategy for improving charge transport across the metal/conjugated polymer interface to achieve much improved performance in organic solar cells. </P>
Ohtomo, M.,Yamauchi, Y.,Sun, X.,Kuzubov, A.,Mikhaleva, N.,Avramov, P.,Entani, S.,Matsumoto, Y.,Naramoto, H.,Sakai, S. Royal Society of Chemistry 2017 Nanoscale Vol.9 No.6
<P>We report the structural analysis and spin-dependent band structure of hydrogenated boron nitride adsorbed on Ni(111). The atomic displacement studied by using the normal incidence X-ray standing wave (NIXSW) technique supports the H-B(fcc):N(top) model, in which hydrogen atoms are site-selectively chemisorbed on boron atoms and N atoms remain on top of Ni atoms. The distance between the Ni plane and nitrogen plane did not change after hydrogenation, which implies that the interaction between Ni and N is 3d-pi orbital mixing (donation and back-donation) even after hydrogenation of boron. The remaining pi* peaks in near-edge X-ray absorption fine structure (NEXAFS) spectra are a manifestation of the rehybridization of sp(2) into sp(3) states, which is consistent with the N-B-N bonding angle derived from NIXSW measurement. The SPMDS measurement revealed the spin asymmetry appearing on hydrogenated h-BN, which was originated from a p related orbital with back donation from the Ni 3d state. Even though the atomic displacement is reproduced by the density functional theory (DFT) calculation with the H-B(fcc):N(top) model, the experimental spin-dependent band structure was not reproduced by DFT possibly due to the self-interaction error (SIE). These results reinforce the site-selective hydrogenation of boron and pave the way for efficient design of BN nanomaterials for hydrogen storage.</P>
Dependence of the properties of hydrothermally grown ZnO on precursor concentration
Zhao, X.,Lee, J.Y.,Kim, C.-R.,Heo, J.,Shin, C.M.,Leem, J.-Y.,Ryu, H.,Chang, J.-H.,Lee, H.C.,Jung, W.-G.,Son, C.-S.,Shin, B.C.,Lee, W.-J.,Tan, S.T.,Zhao, J.,Sun, X. North-Holland 2009 Physica E, Low-dimensional systems & nanostructure Vol.41 No.8
This study evaluated the effects of precursor concentration ranging from 0.06 to 1.5M on the properties of hydrothermally grown ZnO on annealed ZnO buffered Si substrates. At relatively low concentrations (no more than 0.5M), well-aligned ZnO arrays were grown on ZnO/Si(100) due to heterogeneous nucleation. As the concentration was increased to 1.0M, the morphologies changed to randomly accumulated particles as a result of homogeneous nucleation. The crystal and optical properties of the materials were investigated by X-ray diffractometer (XRD) and photoluminescence (PL) measurement, respectively. It was found that the best crystal and optical properties were obtained with concentrations of 0.5 and 0.3M, respectively. These properties were observed to degrade when the concentration was raised to more than 1.0M.
Essential role of clusterin in pancreas regeneration
Lee, Song,Hong, Seokx2010,Woo,Min, Bonx2010,Hong,Shim, Youngx2010,Jun,Lee, Kix2010,Up,Lee, Inx2010,Kyu,Bendayan, M.,Aronow, Bruce J.,Park, Inx2010,Sun Wiley‐Liss, Inc. 2011 Developmental dynamics Vol.240 No.3
<P><B>Abstract</B></P><P>Based on our previous observations that clusterin induction accompanies pancreas regeneration in the rat, we sought to determine if regeneration might be impaired in mice that lacked clusterin. We studied the impact of absent clusterin on morphogenic and functional features of regenerating pancreas. Clusterin induction was accompanied in the regenerating pancreas by a robust development of new lobules with ductules, acini, and endocrine islets in wild type after partial pancreatectomy. In clusterin knock‐out mice, however, pancreatectomy resulted in a poor formation of regenerating lobule. In particular, regeneration of beta‐cells was also significantly reduced and was associated with persistent hyperglycemia. Duct cells obtained from pancreatectomized clusterin knock‐out mice exhibited impaired beta‐cell formation in vitro; this was restored by administration of exogenous clusterin. We suggest that clusterin plays a critical role to promote both exocrine and endocrine regeneration following pancreas injury, as well as for in vitro beta‐cell regeneration. Developmental Dynamics 240:605–615, 2011. © 2011 Wiley‐Liss, Inc.</P>
Lee, Beom H.,Kim, Joo H.,Lee, Sun Y.,Jin, Hye Y.,Kim, Kwix2010,Joo,Lee, Jinx2010,Joo,Park, Jungx2010,Young,Kim, Gux2010,Hwan,Choi, Jinx2010,Ho,Kim, Kyung M.,Yoo, Hanx2010,Wook Blackwell Publishing Ltd 2011 Liver International Vol.31 No.6
<P><B>Abstract</B></P><P><B>Introduction and aims: </B> Wide phenotypic and genotypic heterogeneities in Wilson's disease (WD) have been reported, hampering the study of their correlations. The goal of this study was to identify the factors related to these diversities.</P><P><B>Methods: </B> Clinical courses and molecular genetic characteristics were analysed in 237 unrelated Korean WD families. The average follow‐up period was 8.2 ± 5.8 years.</P><P><B>Results: </B> Presenting phenotypes were classified as H1 (12.2%), H2 (42.4%), N1 (21.6%), N2 (0.4%), NX (0.4%), presymptomatic (22.4%) and other (0.4%), modifying the guidelines by Ferenci and colleagues. Age at presentation was youngest and cirrhosis was rarest in the presymptomatic group. Decompensated cirrhosis was the highest in the H1 group. Favourable outcome was rarest in the N1 group. Forty‐seven (11 novel) <I>ATP7B</I> mutations were identified in 85% of the 474 alleles. Multiplex ligation‐dependent probe amplification assays in <I>ATP7B</I> and analyses of <I>ATOX1</I> and <I>COMMD1</I> genes identified no additional mutations. Yeast complementation assays demonstrated functional perturbation of the seven novel missense mutants. Five major mutations, p.Arg778Leu, p.Ala874Val, p.Asn1270Ser, p.Lys838SerfsX35 and p.Leu1083Phe, accounted for 63% of the alleles. H1 was more common, age at presentation was younger and N1+N2+NX tended to be less common in patients with nonsense, frame shifting or splicing mutations than in those with missense mutations alone. Patients with both mutations in the transduction (Td) or the ATP hinge domain showed presymptomatic or hepatic manifestations but no neurological manifestation.</P><P><B>Conclusions: </B> The presenting phenotype strongly affects the clinical outcome of WD, and is related to the <I>ATP7B</I> mutation type and location, providing an evidence for genotype–phenotype correlations in WD.</P>
Memon, M. A.,Sun, J. h.,Jung, H. T.,Yan, S. k.,Geng, J. x. SPRINGER VERLAG 2017 Chinese journal of polymer science Vol.35 No.3
<P>In this study, we demonstrate a novel method for fabricating polythiophene patterns, i.e., cylindrical holes and cylinders, through blending of a thermally curable polythiophene carrying with tertiary ester groups (PT-tert-ESTER) and poly(methyl methacrylate) (PMMA), followed by thermal conversion of the PT-tert-ESTER to an insoluble polythiophene via low-temperature cleavage of the tertiary ester groups and removal of the PMMA component via ultraviolet degradation. We show that the surface polarity of substrates, the mass ratio of PT-tert-ESTER to PMMA in the blend solutions as well as the concentration of the blend solutions strongly influence the formation of the polythiophene patterns. Cylindrical holes are more readily formed on less polar substrates when a PT-tert-ESTER dominated blend solution is used, while cylinders are more readily formed on more polar substrates when a PMMA dominated blend solution is used. Moreover, the diameters of both the cylindrical holes and the cylinders decrease as the PT-tert-ESTER concentration is increased in the respective ranges of the PT-tert-ESTER/PMMA ratios where the patterns are formed. Grazing incident X-ray diffraction data have indicated that the patterning of the PT-tert-ESTER component in the blend films improves the crystallinity of PT-tert-ESTER as well as the molecular packing of the insoluble polythiophene in the resultant patterned polythiophene films.</P>