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Shin, Hyeong-Seob,Jung, Yong-Geun,Cho, Hyun-Kyu,Park, Yong-Gyu,Cho, Cheon-Gyu American Chemical Society 2014 ORGANIC LETTERS Vol.16 No.21
<P>A new synthetic route to (+/-)-lycorine, starting from the endo-cycloadduct of 3,5-dibromo-2-pyrone and (E)-beta-borylstyrene, is reported. Boronate oxidation and a set of reactions including face-selective epoxidation provided the pivotal C1-OH group and C3/C3a double bond.</P>
Cho, Sung-Gook,Go, Ho Yeon,Park, Jeong-Su,Jung, Ki-Yong,Sun, Seung-Ho,Choi, You-Kyung,Song, Yun-Kyung,Park, Jong-Hyeong,Jun, Chan-Yong,Ko, Seong Gyu Hindawi Publishing Corporation 2014 Evidence-based Complementary and Alternative Medic Vol.2014 No.-
<P>Herbal prescription, Danggui-Sayuk-Ga-Osuyu-Saenggang-tang (DSGOST), has long been used to treat Raynaud's phenomenon (RP) in traditional Chinese medicine (TCM). However, a biological mechanism by which DSGOST ameliorates RP is yet deciphered. In this study, we demonstrate that DSGOST inhibits cold-induced activation of RhoA, in both vascular smooth muscle cells (VSMC) and endothelial cells (EC), and blocks endothelin-1-mediated paracrine path for cold response on vessels. While cold induced RhoA activity in both cell types, DSGOST pretreatment prevented cold-induced RhoA activation. DSGOST inhibition of cold-induced RhoA activation further blocked <I><I>α</I></I>2c-adrenoreceptor translocation to the plasma membrane in VSMC. In addition, DSGOST inhibited endothelin-1-mediated RhoA activation and <I><I>α</I></I>2c-adrenoreceptor translocation in VSMC. Meanwhile, DSGOST inhibited cold-induced or RhoA-dependent phosphorylation of FAK, SRC, and ERK. Consistently, DSGOST inhibited cold-induced endothelin-1 expression in EC. Therefore, DSGOST prevents cold-induced RhoA in EC and blocks endothelin-1-mediated paracrine path between EC and VSMC. In conclusion, our data suggest that DSGOST is beneficial for treating RP-like syndrome.</P>
Hyeong-Do Kim,Chul-Hee Min,Boyoun Kang,Beong Ki Cho,En-Jin Cho,Byeong-Gyu Park 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.2
Temperature-dependent angle-resolved photoemission spectroscopy (ARPES) was carried out on single-crystalline EuB6 samples. By measuring ARPES spectra in an extended Brillouin zone, we clearly observed a B 2p hole pocket centered at the X point as shown in Fig. 1, thus proving the semimetallic nature of EuB6. Below the Curie temperature TC, ARPES spectra show two B 2p bands of which separation is due to an exchange interaction between local Eu 4f and itinerant B 2p electrons. The exchange splitting becomes smaller as the temperature increases and disappears well above TC. Additionally, a diffuse structure near the Fermi level survives at temperatures just above TC. Such behavior is well described by using Monte Carlo simulations of a Kondo lattice model, thus supporting the formation of magnetic polarons in EuB6, which accounts for the resistivity upturn slightly above TC as the temperature is lowered. 〈그림 본문참조〉