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Al-Doping Effect on the Photoluminescence Behaviors of CaTiO3:Pr3+ Powder Phosphors
Yang HyunKyoung,Jeong Jung Hyun,Kim Jung Hwan,Kim Pyoung,Moon Byung kee,Yi Soung Soo 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.1
The correlation between the crystallization, the surface morphology, and the luminescent properties of Al-doped CaTiO3:Pr3+ powder phosphors has been investigated. Al doping in the host lattice improves the crystallization and enhances the luminescent properties. The grains of Al-doped CaTiO3:Pr3+ powder were larger and well-defined with orthorhombic shapes compared with those of a CaTiO3:Pr3+ powder. According to the cathodoluminescence(CL) and photoluminescence(PL) results, the red emission peaks from the 1D2!3H4 transition were increased by more than about 1.5 and 1.8 times with Al-doping. The red emission peaks at 610, 612, 614, 626, and 637 nm are assigned to 4f-5d transitions from the 1D2 states to the ground state. As the temperature was increased from 12 to 300 K, the shape of PL spectra remained the same, and the PL intensity uniformly increased for both the CaTiO3:Pr3+ and the Al-doped CaTiO3:Pr3+ powders. The PL intensity was increased by more than 3 times with Al-doping. For the CL spectra, Al-doped CaTiO3:Pr3+ was stable, and no change in crystal field was seen under a low acceleration voltage.P
Isolation and identification of canine adenovirus type 2 from a naturally infected dog in Korea
Yang, Dong-Kun,Kim, Ha-Hyun,Yoon, Soon-Seek,Lee, Hyunkyoung,Cho, In-Soo The Korean Society of Veterinary Science 2018 大韓獸醫學會誌 Vol.58 No.4
Canine adenovirus type 2 (CAV-2) infection results in significant respiratory illness in dogs. Isolating and culturing CAV-2 allows for investigations into its pathogenesis and the development of vaccines and diagnostic assays. In this study, we successfully isolated a virus from a naturally infected dog in Gyeonggi-do, Korea. The virus was propagated in Madin-Darby canine kidney (MDCK) and Vero cells and showed a specific cytopathic morphology that appeared similar to a bunch of grapes. The virus was first confirmed as CAV-2 based on these cytopathic effects, an immunofluorescence assay, hemagglutination assay, and electron microscopy. The viral titer of the isolate designated APQA1601 reached $10^{6.5}$ 50% tissue culture infections dose per mL in MDCK cells and exhibited no hemagglutination units with erythrocytes from guinea pig. The virus was also confirmed by polymerase chain reaction and next-generation sequencing. The APQA1601 strain had the highest similarity (~99.9%) with the Toronto A26/61 strain, which was isolated in Canada in 1976 when the nucleotide sequences of the full genome of the APQA1601 strain were compared with those of other CAV strains. Isolating CAV-2 will help elucidate the biological properties of CAV-2 circulating in Korean dogs.
The Hair Growth-Promoting Effect of <i> Rumex japonicus</i> Houtt. Extract
Lee, Hyunkyoung,Kim, Na-Hyun,Yang, Hyeryeon,Bae, Seong Kyeong,Heo, Yunwi,Choudhary, Indu,Kwon, Young Chul,Byun, Jae Kuk,Yim, Hyeong Jun,Noh, Byung Seung,Heo, Jeong-Doo,Kim, Euikyung,Kang, Changkeun Hindawi Publishing Corporation 2016 Evidence-based Complementary and Alternative Medic Vol.2016 No.-
<P><I>Rumex japonicus </I>Houtt. is traditionally used as a medicinal plant to treat patients suffering from skin disease in Korea. However, the beneficial effect of<I> Rumex japonicus </I>Houtt. on hair growth has not been thoroughly examined. Therefore, the present study aims to investigate the hair growth-promoting effect of<I> Rumex japonicus </I>(RJ) Houtt. root extract using human dermal papilla cells (DPCs), HaCaT cells, and C57BL/6 mice model. RJ induced antiapoptotic and proliferative effects on DPCs and HaCaT cells by increasing Bcl-2/Bax ratio and activating cellular proliferation-related proteins, ERK and Akt. RJ also increased <I>β</I>-catenin via the inhibition of GSK-3<I>β</I>. In C57BL/6 mice model, RJ promoted the anagen induction and maintained its period. Immunohistochemistry analysis demonstrated that RJ upregulated Ki-67 and <I>β</I>-catenin expressions, suggesting that the hair growth effect of RJ may be mediated through the reinforcement of hair cell proliferation. These results provided important insights for the possible mechanism of action of RJ and its potential as therapeutic agent to promote hair growth.</P>
Lee, Hyunkyoung,Bae, Seong Kyeong,Kim, Munki,Pyo, Min Jung,Kim, Minkyung,Yang, Sujeoung,Won, Chung-kil,Yoon, Won Duk,Han, Chang Hoon,Kang, Changkeun,Kim, Euikyung Hindawi 2017 Evidence-based Complementary and Alternative Medic Vol.2017 No.-
<P>Various kinds of animal venoms and their components have been widely studied for potential therapeutic applications. This study evaluated whether<I> Nemopilema nomurai </I>jellyfish venom (NnV) has anticancer activity. NnV strongly induced cytotoxicity of HepG2 cells through apoptotic cell death, as demonstrated by alterations of chromatic morphology, activation of procaspase-3, and an increase in the Bax/Bcl-2 ratio. Furthermore, NnV inhibited the phosphorylation of PI3K, PDK1, Akt, mTOR, p70S6K, and 4EBP1, whereas it enhanced the expression of p-PTEN. Interestingly, NnV also inactivated the negative feedback loops associated with Akt activation, as demonstrated by downregulation of Akt at Ser473 and mTOR at Ser2481. The anticancer effect of NnV was significant in a HepG2 xenograft mouse model, with no obvious toxicity. HepG2 cell death by NnV was inhibited by tetracycline, metalloprotease inhibitor, suggesting that metalloprotease component in NnV is closely related to the anticancer effects. This study demonstrates, for the first time, that NnV exerts highly selective cytotoxicity in HepG2 cells via dual inhibition of the Akt and mTOR signaling pathways, but not in normal cells.</P>
Oh, Minsoo,Kim, Hangun,Yang, Ilhwan,Park, Ja-Hye,Cong, Wei-Tao,Baek, Moon-Chang,Bareiss, Sonja,Ki, Hyunkyoung,Lu, Qun,No, Jinhyung,Kwon, Inho,Choi, Jung-Kap,Kim, Kwonseop American Society for Biochemistry and Molecular Bi 2009 The Journal of biological chemistry Vol.284 No.42
<P>Delta-catenin was first identified because of its interaction with presenilin-1, and its aberrant expression has been reported in various human tumors and in patients with Cri-du-Chat syndrome, a form of mental retardation. However, the mechanism whereby delta-catenin is regulated in cells has not been fully elucidated. We investigated the possibility that glycogen-synthase kinase-3 (GSK-3) phosphorylates delta-catenin and thus affects its stability. Initially, we found that the level of delta-catenin was greater and the half-life of delta-catenin was longer in GSK-3beta(-/-) fibroblasts than those in GSK-3beta(+/+) fibroblasts. Furthermore, four different approaches designed to specifically inhibit GSK-3 activity, i.e. GSK-3-specific chemical inhibitors, Wnt-3a conditioned media, small interfering RNAs, and GSK-3alpha and -3beta kinase dead constructs, consistently showed that the levels of endogenous delta-catenin in CWR22Rv-1 prostate carcinoma cells and primary cortical neurons were increased by inhibiting GSK-3 activity. In addition, it was found that both GSK-3alpha and -3beta interact with and phosphorylate delta-catenin. The phosphorylation of DeltaC207-delta-catenin (lacking 207 C-terminal residues) and T1078A delta-catenin by GSK-3 was noticeably reduced compared with that of wild type delta-catenin, and the data from liquid chromatography-tandem mass spectrometry analyses suggest that the Thr(1078) residue of delta-catenin is one of the GSK-3 phosphorylation sites. Treatment with MG132 or ALLN, specific inhibitors of proteosome-dependent proteolysis, increased delta-catenin levels and caused an accumulation of ubiquitinated delta-catenin. It was also found that GSK-3 triggers the ubiquitination of delta-catenin. These results suggest that GSK-3 interacts with and phosphorylates delta-catenin and thereby negatively affects its stability by enabling its ubiquitination/proteosome-mediated proteolysis.</P>
김지현 ( Ji-hyeon Kim ),이현경 ( Hyunkyoung Lee ),이경현 ( Kyunghyun Lee ),백강현 ( Kanghyun Baek ),최은진 ( Eunjin Choi ),소병재 ( Byungjae So ),양시연 ( Siyeon Yang ) 한국동물위생학회 2016 한국동물위생학회지 (KOJVS) Vol.39 No.3
A 16 year-old female grey pony was presented to Animal and Plant Quarantine agency for diagnosis in Feb 2, 2015. At necropsy, multiple pigmented masses, likely melanomas, were detected peri-anally and under the tail. Further metastatic spread to the spleen, liver, lung and lymph nodes was also identi-fied. Histopathologically, anaplastic and pleomorphic melanocytes were observed in the mass. By im-munohistochemistry, PNL2, S100 and PGP 9.5 protein were detected, but Melan A was not expressed in the neoplastic melanocytes. Based on the pathological and immunohistochemical examination, we di-agnosed this case as malignant melanoma in a grey pony. To the authors` knowledge, this is the first report of equine malignant melanoma in republic of Korea.
Park, Ji Chan,Jang, Sanha,Rhim, Geun Bae,Lee, Jin Hee,Choi, Hyunkyoung,Jeong, Heon-Do,Youn, Min Hye,Lee, Dong-Wook,Koo, Kee Young,Kang, Shin Wook,Yang, Jung-Il,Lee, Ho-Tae,Jung, Heon,Kim, Chul Sung,Ch Elsevier 2018 Applied catalysis. A, General Vol.564 No.-
<P><B>Abstract</B></P> <P>Improvement of activity, selectivity, and stability of the catalyst used in Fischer-Tropsch synthesis (FTS) to produce targeted hydrocarbon products has been a major challenge. In this work, the potassium-doped iron-carbide/alumina (K-Fe<SUB>5</SUB>C<SUB>2</SUB>/Al<SUB>2</SUB>O<SUB>3</SUB>), as a durable nanocatalyst containing small iron-carbide particles (∼ 10 nm), was applied to high-temperature Fischer-Tropsch synthesis (HT-FTS) to optimize the production of linear alpha olefins. The catalyst, suitable under high space velocity reaction conditions (14–36 N L g<SUB>cat</SUB> <SUP>−1</SUP> h<SUP>−1</SUP>) based on the well-dispersed potassium as an efficient base promoter on the active iron-carbide surface, shows very high CO conversion (up to ∼90%) with extremely high activity (1.41 mmol<SUB>CO</SUB> g<SUB>Fe</SUB> <SUP>−1</SUP> s<SUP>−1</SUP>) and selectivity for C<SUB>5</SUB>–C<SUB>13</SUB> linear alpha olefins.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The potassium-doped iron-carbide/alumina nanocatalyst was prepared for effective production of linear alpha olefins. </LI> <LI> The active iron-carbide nanoparticles (∼10 nm) with potassium on gamma-alumina could enhance catalytic performance. </LI> <LI> The catalyst showed high stability and activity for high-temperature Fischer-Tropsch synthesis. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>A potassium-doped iron-carbide/alumina nanocatalyst shows very high CO conversion (∼90%) and significant productivity for C<SUB>5</SUB>–C<SUB>13</SUB> linear alpha olefins in Fischer-Tropsch synthesis under high space velocity conditions.</P> <P>[DISPLAY OMISSION]</P>