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RISS 인기검색어
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- 저자 : Inhoe Kim (검색결과 724 건)
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Kim, Jin-Seong,Kim, Jae-Han,Lee, Wonho,Yu, Hojeong,Kim, Hyeong Jun,Song, Inho,Shin, Minkwan,Oh, Joon Hak,Jeong, Unyong,Kim, Taek-Soo,Kim, Bumjoon J. American Chemical Society 2015 Macromolecules Vol.48 No.13
<P>While the regioregularity (RR) of conjugated polymers is known to have a strong influence on their inherent properties, systematic study of the RR effect has been limited due to the lack of a synthetic methodology. Herein, we successfully produced a series of poly(3-hexylthiophene)s (P3HTs) having a wide range of RR from 64 to 98%. Incorporation of controlled amounts of head-to-head (H-H) coupled dimer in modified Grignard metathesis polymerization allows a facile tuning of the RR of the P3HTs with comparable molecular weight and low polydispersity. Then, we investigated the effect of RR on structural, electrical, and mechanical properties of P3HTs in which a higher content of H-H regio-defects, namely lower RR, systematically lowered the degree of crystallinity. Although high RR P3HT (98%) had higher charge carrier mobility (1.81 x 10(-1) cm(2) V-1 s(-1)), its strong crystallinity induced high brittleness and stiffness, resulting in device failure under a very small strain, as shown in tensile and bending tests. The tensile modulus was reduced significantly from 287 MPa (RR 98%) to 13 MPa (RR 64%), and also the RR 64% P3HT film had much better mechanical resilience with an order of magnitude higher elongation at break than that of the RR 98% polymer. Our findings suggest that the mechanical and electrical properties of conjugated polymers can be systematically tuned by controlling the RR to meet the purposes of various organic electronic applications, i.e., flexible portable devices vs high-performance panels.</P>
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Kim, Inho,Seo, Myung-gi,Choi, Changhyeok,Kim, Jin Soo,Jung, Euiyoung,Han, Geun-Ho,Lee, Jae-Chul,Han, Sang Soo,Ahn, Jae-Pyoung,Jung, Yousung,Lee, Kwan-Young,Yu, Taekyung American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.44
<P>The catalytic properties of materials are determined by their electronic structures, which are based on the arrangement of atoms. Using precise calculations, synthesis, analysis, and catalytic activity studies, we demonstrate that changing the lattice constant of a material can modify its electronic structure and therefore its catalytic activity. Pd/Au core/shell nanocubes with a thin Au shell thickness of 1 nm exhibit high H<SUB>2</SUB>O<SUB>2</SUB> production rates due to their improved oxygen binding energy (Δ<I>E</I><SUB>O</SUB>) and hydrogen binding energy (Δ<I>E</I><SUB>H</SUB>), as well as their reduced activation barriers for key reactions.</P> [FIG OMISSION]</BR>
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Common <i>CYP7A1</i> promoter polymorphism associated with risk of neuromyelitis optica
Kim, Ho Jin,Park, Hyun-Young,Kim, Eunkyung,Lee, Kwang-Soo,Kim, Kwang-Kuk,Choi, Byung-Ok,Kim, Seung Min,Bae, Joon Seol,Lee, Soo Ok,Chun, Ji Yong,Park, Tae Joon,Cheong, Hyun Sub,Jo, Inho,Shin, Hyoung Do Elsevier 2010 Neurobiology of disease Vol.37 No.2
<P><B>Abstract</B></P><P>Neuromyelitis optica (NMO) is a severe idiopathic inflammatory disease of the central nervous system primarily affecting the optic nerves and spinal cord. In this study, we generated genome-wide SNP data from NMO patients and normal controls (53 cases and 240 controls), and followed up on the association signals with samples from a larger number of inflammatory demyelinating diseases, including NMO (<I>n</I>=93), multiple sclerosis (MS, <I>n</I>=71), idiopathic recurrent transverse myelitis (IRTM, <I>n</I>=57), and normal controls (<I>n</I>=240). Statistical analyses revealed that a common promoter SNP in <I>CYP7A1</I> has a protective/gene dose-dependent effect on the risk of NMO (<I>P</I>=0.0004). A stronger association between the variables and subsequently, a higher protective effect (lower OR) on the risk of NMO were observed among patients carrying the “G/G” genotype of <I>rs3808607</I> than those with the “T/G” genotype (OR=0.38/<I>P</I>=0.01 vs. OR=0.12/<I>P</I>=0.0004, respectively). The associations which were only observed in patients with NMO suggest that there are differences in the genetic etiology of the inflammatory demyelinating diseases (NMO, classical MS, and IRTM).</P>
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일렬 자가조혈모세포이식을 받은 다발성 골수종 환자에서 발생한 뇌 톡소포자충증 1례
김계형,송경호,전재현,박완범,박상원,김홍빈,김남중,김인호,오명돈 대한감염학회 2010 감염과 화학요법 Vol.42 No.3
Toxoplasmosis is a rare but fatal complication in hematopoietic stem cell transplant recipients, usually associated with allogeneic hematopoietic stem cell transplantation (HSCT). We report a case of cerebral toxoplasmosis in a patient with multiple myeloma, following tandem autologous stem cell transplantation. A 55-year-old Korean male presented with weakness in both legs that had progressed to both arms. A magnetic resonance imaging scan of the brain revealed multiple, variablesized ring-enhancing lesions with surrounding edema in the cerebral hemispheres and brain stem. Stereotactic biopsy revealed bradyzoites of Toxoplasma gondii in the brain tissue. The patient received trimethoprim-sulfamethoxazole, followed by pyrimethamine and sulfadiazine, accompanying treatment for progressive multiple myeloma. Cerebral toxoplasmosis should be considered as one of the differential diagnoses in patients with neurologic signs following autologous HSCT.
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Kim, Jin-Soo,Kim, Hong-Kyu,Kim, Sung-Hoon,Kim, Inho,Yu, Taekyung,Han, Geun-Ho,Lee, Kwan-Young,Lee, Jae-Chul,Ahn, Jae-Pyoung American Chemical Society 2019 ACS NANO Vol.13 No.4
<P>Despite its effectiveness in improving the properties of materials, strain engineering has not yet been employed to endow catalytic characteristics to apparently nonactive metals. This limitation can be overcome by controlling simultaneously lattice strains and charge transfer originated from the epitaxially prepared bimetallic core-shell structure. Here, we report the experimental results of the direct H<SUB>2</SUB>O<SUB>2</SUB> synthesis enabled by a strained Au layer grown on Pd nanoparticles. This system can benefit the individual catalytic properties of each involved material, and the heterostructured catalyst displays an improved productivity for the direct synthesis of H<SUB>2</SUB>O<SUB>2</SUB> by ∼100% relative to existing Pd catalysts. This is explained here by exploring the individual effects of lattice strain and charge transfer on the alteration of the electronic structure of ultrathin Au layers grown on Pd nanoparticles. The approach used in this study can be viewed as a means of designing catalysts with multiple catalytic functions.</P> [FIG OMISSION]</BR>
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