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Kim, Haeri,Moon, Seon Young,Kim, Shin-Ik,Baek, Seung-Hyub,Jang, Ho Won,Kim, Dong-Wook American Chemical Society 2014 ACS APPLIED MATERIALS & INTERFACES Vol.6 No.16
<P>We investigated the influences of charge writing on the surface work function (<I>W</I>) and sheet resistance (<I>R</I>) of the LaAlO<SUB>3</SUB>/SrTiO<SUB>3</SUB> (LAO/STO) heterointerface in several gas environments: H<SUB>2</SUB>(2%)/N<SUB>2</SUB>(98%), air, N<SUB>2</SUB>, and O<SUB>2</SUB>. The decrease in <I>W</I> and <I>R</I> due to charge writing was much larger in air (Δ<I>W</I> = −0.45 eV and Δ<I>R</I> = −40 kΩ/<I>S</I>) than in O<SUB>2</SUB> (Δ<I>W</I> = −0.21 eV and Δ<I>R</I> = −19 kΩ/<I>S</I>). The reduced <I>R</I> could be maintained more than 100 h in H<SUB>2</SUB>/N<SUB>2</SUB>. Such distinct behaviors were quantitatively discussed, based on the proposed charge-writing mechanisms. Such analyses showed how several processes, such as carrier transfer via surface adsorbates, surface redox, electronic state modification, and electrochemical surface reactions, contributed to charge writing in each gas.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2014/aamick.2014.6.issue-16/am503367f/production/images/medium/am-2014-03367f_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am503367f'>ACS Electronic Supporting Info</A></P>
YoungJong Kim,JinKyung Park,WonSub Kang,SuKang Kim,Changsu Han,HaeRi Na,HaeJeong Park,JongWoo Kim,YoungYoul Kim,MoonHo Park,JongWoo Paik 대한신경정신의학회 2017 PSYCHIATRY INVESTIGATION Vol.14 No.1
Objective-Mitochondrial dysfunction is a prominent and early feature of Alzheimer’s disease (AD). The morphologic changes observed in the AD brain could be caused by a failure of mitochondrial fusion mechanisms. The aim of this study was to investigate whether genetic polymorphisms of two genes involved in mitochondrial fusion mechanisms, optic atrophy 1 (OPA1) and mitofusin 2 (MFN2), were associated with AD in the Korean population by analyzing genotypes and allele frequencies. Methods-One coding single nucleotide polymorphism (SNP) in the MFN2, rs1042837, and two coding SNPs in the OPA1, rs7624750 and rs9851685, were compared between 165 patients with AD (83 men and 82 women, mean age 72.3±4.41) and 186 healthy control subjects (82 men and 104 women, mean age 76.5±5.98). Results-Among these three SNPs, rs1042837 showed statistically significant differences in allele frequency, and genotype frequency in the co-dominant 1 model and in the dominant model. Conclusion-These results suggest that the rs1042837 polymorphism in MFN2 may be involved in the pathogenesis of AD.
( Min Su Kim ),( Gi Woong Nam ),( Dong Wan Kim ),( Ha Eun Kim ),( Haeri Kang ),( Wook Bin Lee ),( Hyon Kwang Choi ),( Yang Soo Kim ),( Jae Young Leem ) 대한금속재료학회(구 대한금속학회) 2015 대한금속·재료학회지 Vol.53 No.2
ZnO nanorods were hydrothermally grown on R-plane sapphire substrates coated with an as-grown ZnO seed layer and with ZnO seed layers annealed at different temperatures. The effects of the seed-layer annealing temperature on the structural and optical properties of the ZnO nanorods were investigated using scanning electron microscopy, X-ray diffraction, and photoluminescence. ZnO nanorods and nanosheets grew on the as-prepared seed layer. Only ZnO nanorods grew on the ZnO seed layer annealed above 700 ℃. The structural and optical properties of the ZnO nanorods were significantly enhanced when the seed layers were annealed at 700 ℃. A cubic equation was used to establish the non-linear exciton radiative lifetime of the free exciton emission peak. Varshni’s empirical equation fitting parameters were α = 4 × 10.3 eV/K, β = 1 × 104 K, and Eg(0) = 3.335 eV; the activation energy was ~94.6 meV.
Kim, Haeri,Yang, Gi Hoon,Choi, Chang Hyun,Cho, Yong Suk,Kim, GeunHyung Elsevier 2018 INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES Vol.120 No.1
<P><B>Abstract</B></P> <P>Tissue engineering aims to repair or replace damaged tissues or organs using biomedical scaffolds cultured with cells. The scaffolds composed of biomaterials should guide the cells to mature into functional tissues or organs. An ideal scaffold to regenerate hard tissues should have mechanical stability as well as biocompatibilities. It has been well known that gelatin can provide outstanding biological activities, but its low mechanical stability can be one of obstacles to be used in hard tissue regeneration. To overcome the issue, we used PVA, which can reinforce the low mechanical stability of the gelatin. The gelatin/PVA scaffolds have been fabricated using a low temperature 3D-printing process. By manipulating various weight fractions of PVA/gelatin, we can obtain the optimal mixture ratio in aspect of the physical and biological properties of the scaffolds. As a result, a weight fraction of 5:5 showed appropriate mechanical strength and enhanced cell activities, such as cell proliferation and differentiation. The gelatin/PVA scaffold showed potential for future application as biomedical scaffold in soft and hard tissue regeneration.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A hybrid scaffold composed of gelatin and PVA was fabricated using direct printing employed with low temperature system. </LI> <LI> PVA was used to reinforce the shortcoming of gelatin which is low mechanical strength. </LI> <LI> A mixture ratio of 5:5 showed reasonable mechanical strength and enhanced cellular activities. </LI> </UL> </P>
A thiourea-based fluorescent chemosensor for bioimaging hypochlorite
Haeri So,Hangyul Lee,Gyu Dong Lee,Mingeun Kim,Mi Hee Lim,Ki-Tae Kim,Cheal Kim 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.89 No.-
A thiourea-basedfluorescent turn-off chemosensor FHC was developed for recognizing hypochlorite. With the addition of hypochlorite to FHC, FHC displayed a specific desulfurization reaction of thethiourea group followed by thefluorescent quenching response. Thefluorescent turn-off response of FHCto hypochlorite was very fast tofinish within a few seconds. Detection limit of hypochlorite wasdetermined to be 0.43 mM. FHC can be applied for the bioimaging of hypochlorite in both HeLa cells andzebrafish. Response process of FHC to hypochlorite, via the desulfurization of the thiourea moiety, wasdemonstrated, based on 1H NMR titrations, ESI-mass,fluorescent and UV–vis titrations and DFTcalculations.