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Pattern of cerebral hypoperfusion according to the clinical staging in dementia with Lewy bodies
Park, Kyung Won,Hong, Yun Jeong,Park, Jong Hwan,Park, Hyuntae,Cheon, Sang Myung,Kim, Jae Woo,Kim, Byeong C,Jeong, Young Jin,Yoon, Hyun Jin,Kang, Do-Young Informa UK (TaylorFrancis) 2018 Neurocase Vol.24 No.2
<P>This study aimed to detect different patterns of cerebral hypoperfusion in DLB according to clinical staging. Thirty-three patients with DLB were recruited by clinical dementia rating (CDR) stage. Compared with control, cerebral hypoperfusion was mainly observed in the lingual gyrus, the cuneus, the occipital gyrus in CDR 0.5 group; the fusiform gyrus, the middle temporal gyrus, and the posterior cingulate in CDR 1; and the lingual gyrus, the cuneus, the hippocampus, the fusiform gyrus, and the inferior frontal gyrus in CDR 2. Our findings suggest that cerebral hypoperfusion spreads to the frontal cortex and temporal lobes as disease progresses.</P>
Park, Kyeng Min,Yang, Jeong-A,Jung, Hyuntae,Yeom, Junseok,Park, Ji Sun,Park, Keun-Hong,Hoffman, Allan S.,Hahn, Sei Kwang,Kim, Kimoon American Chemical Society 2012 ACS NANO Vol.6 No.4
<P>A facile <I>in situ</I> supramolecular assembly and modular modification of biocompatible hydrogels were demonstrated using cucurbit[6]uril-conjugated hyaluronic acid (CB[6]-HA), diaminohexane-conjugated HA (DAH-HA), and tags-CB[6] for cellular engineering applications. The strong and selective host–guest interaction between CB[6] and DAH made possible the supramolecular assembly of CB[6]/DAH-HA hydrogels in the presence of cells. Then, the 3D environment of CB[6]/DAH-HA hydrogels was modularly modified by the simple treatment with various multifunctional tags-CB[6]. Furthermore, we could confirm <I>in situ</I> formation of CB[6]/DAH-HA hydrogels under the skin of nude mice by sequential subcutaneous injections of CB[6]-HA and DAH-HA solutions. The fluorescence of modularly modified fluorescein isothiocyanate (FITC)-CB[6] in the hydrogels was maintained for up to 11 days, reflecting the feasibility to deliver the proper cues for cellular proliferation and differentiation in the body. Taken together, CB[6]/DAH-HA hydrogels might be successfully exploited as a 3D artificial extracellular matrix for various tissue engineering applications.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2012/ancac3.2012.6.issue-4/nn204123p/production/images/medium/nn-2011-04123p_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn204123p'>ACS Electronic Supporting Info</A></P>
Color Pure and Stable Blue Light Emitting Material Containing Anthracene and Fluorene for OLED
Hyuntae Park,Daehwan Oh,Jong-Won Park,김진학,Sung-Chul Shin,김윤희,권순기 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.7
A new blue light emitting anthracene derivative, 9,10-bis-(9',9'-diethyl-7'-t-butyl-fluoren-2'-yl)anthracene (BETF),has been designed and synthesized by a palladium catalyzed Suzuki cross-coupling. A theoretical calculation of the three-dimensional structure of BETF supports that it has a non coplanar structure and inhibited intermolecular interactions resulting in high luminescent efficiency and high color purity. BETF has good thermal stability with glass-transition temperature (Tg) of 131 oC. The PL maximum of BETF in solution and film were 438 nm and 440 nm, respectively,showing pure blue emission. A multilayer device using BETF as emitting material exhibits maximum luminescence efficiency of 2.2 cd/A and a pure blue emission (Commission Internationale de L’Eclairage (CIE) coordinates of x = 0.15,y = 0.10).
Jung, Hyuntae,Park, Ji Sun,Yeom, Junseok,Selvapalam, Narayanan,Park, Kyeng Min,Oh, Kyunghoon,Yang, Jeong-A,Park, Keun Hong,Hahn, Sei Kwang,Kim, Kimoon American Chemical Society 2014 Biomacromolecules Vol.15 No.3
<P>Despite a wide investigation of hydrogels as an artificial extracellular matrix, there are few scaffold systems for the facile spatiotemporal control of mesenchymal stem cells (MSCs). Here, we report 3D tissue engineered supramolecular hydrogels prepared with highly water-soluble monofunctionalized cucurbit[6]uril–hyaluronic acid (CB[6]-HA), diaminohexane conjugated HA (DAH-HA), and drug conjugated CB[6] (drug-CB[6]) for the controlled chondrogenesis of human mesenchymal stem cells (hMSCs). The mechanical property of supramolecular HA hydrogels was modulated by changing the cross-linking density for the spatial control of hMSCs. In addition, the differentiation of hMSCs was temporally controlled by changing the release profiles of transforming growth factor-β3 (TGF-β3) and/or dexamethasone (Dexa) from the hydrolyzable Dexa-CB[6]. The effective chondrogenic differentiation of hMSCs encapsulated in the monoCB[6]/DAH-HA hydrogel with TGF-β3 and Dexa-CB[6] was confirmed by biochemical glycosaminoglycan content analysis, real-time quantitative PCR, histological, and immunohistochemical analyses. Taken together, we could confirm the feasibility of cytocompatible monoCB[6]/DAH-HA hydrogels as a platform scaffold with controlled drug delivery for cartilage regeneration and other various tissue engineering applications.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/bomaf6/2014/bomaf6.2014.15.issue-3/bm401123m/production/images/medium/bm-2013-01123m_0010.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/bm401123m'>ACS Electronic Supporting Info</A></P>
Immobilized CuO hollow nanospheres catalyzed alkyne-azide cycloadditions.
Kang, Hyuntae,Jung, Hyun Seok,Kim, Jee Young,Park, Ji Chan,Kim, Mijong,Song, Hyunjoon,Park, Kang Hyun American Scientific Publishers 2010 Journal of Nanoscience and Nanotechnology Vol.10 No.10
<P>An approach for gram-scale synthesis of uniform Cu2O nanocubes by a one-pot polyol process was used. The CuO hollow nanostructures were prepared by adding aqueous ammonia solutions with Cu2O nanocube colloidal solutions. CuO hollow nanospheres on acetylene black (CuO/AB), were synthesized and used for the catalytic [3+2] cycloaddition of azides with terminal alkynes to provide products in good yields with high regioselectivity. The CuO/AB was readily separated by centrifugation and could be reused ten times under the present reaction conditions without any loss of catalytic activity. Transition metals loaded onto acetylene black are useful reagents for a wide variety of organic transformations. Moreover, these heterogeneous systems are promising industrial catalysts.</P>