http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Qin, L.,Wei, D.,Huang, Y.,Kim, S.I.,Yu, Y.M.,Seo, H.J. Elsevier Sequoia 2013 Journal of alloys and compounds Vol.574 No.-
Eulytite-type orthophosphates M<SUB>7</SUB>Zr(PO<SUB>4</SUB>)<SUB>6</SUB> (M=Ca, Sr, Ba) were prepared by conventional high temperature solid-state reaction. Sr<SUB>7</SUB>Zr(PO<SUB>4</SUB>)<SUB>6</SUB> and Ba<SUB>7</SUB>Zr(PO<SUB>4</SUB>)<SUB>6</SUB> crystallize in the pure eulytite-type phase with cubic space group (I4@?3d). The impurity phase β-Ca<SUB>3</SUB>(PO<SUB>4</SUB>)<SUB>2</SUB> was inevitably coexisted with the Ca<SUB>7</SUB>Zr(PO<SUB>4</SUB>)<SUB>6</SUB> phase. The luminescence properties are investigated by UV-VUV excitation and emission spectroscopy and X-ray-excited luminescence (XEL) spectroscopy. The broad excitation and emission bands are observed due to the charge transfer transition from Zr<SUP>4+</SUP> to O<SUP>2-</SUP> in M<SUB>7</SUB>Zr(PO<SUB>4</SUB>)<SUB>6</SUB> (M=Ca, Sr, Ba) eulytite. The characteristics of the phosphors including the luminescence mechanism are explained by Stokes shift, decay curves, and CIE color coordinates. The Sr<SUB>7</SUB>Zr(PO<SUB>4</SUB>)<SUB>3</SUB> and Ba<SUB>7</SUB>Zr(PO<SUB>4</SUB>)<SUB>3</SUB> phosphors exhibit unusual spectral features with the emission bands at 470 and 480nm, respectively. The weak luminescence centered at 495nm is observed in the Ca<SUB>7</SUB>Zr(PO<SUB>4</SUB>)<SUB>6</SUB> eulytite with lifetime of 4.67μs. The unusual self-activated luminescence is discussed on the base of the crystal structure of eulytite.
Synthesis and biological activity of new phthalimides as potential anti-inflammatory agents
Bach, D.H.,Liu, J.Y.,Kim, W.K.,Hong, J.Y.,Park, S.H.,Kim, D.,Qin, S.N.,Luu, T.T.T.,Park, H.J.,Xu, Y.N.,Lee, S.K. Elsevier/Pergamon 2017 Bioorganic & medicinal chemistry Vol.25 No.13
The overproduction of nitric oxide (NO) plays an important role in a variety of pathophysiological processes, including inflammation. Therefore, the suppression of NO production is a promising target in the design of anti-inflammatory agents. In the present study, a series of phthalimide analogs was synthesized, and their anti-inflammatory activities were evaluated using lipopolysaccharide (LPS)-stimulated NO production in cultured murine macrophage RAW264.7 cells. A structure-activity relationship study showed that the free hydroxyl group at C-4 and C-6 and the bulkiness of the N-substituted alkyl chain are associated with biological activity. Among the series of phthalimide derivatives, compound IIh exhibited potent inhibitory activity, with an IC<SUB>50</SUB> value of 8.7@?g/mL. Further study revealed that the inhibitory activity of compound IIh was correlated with the down-regulation of the mRNA and protein expression of LPS-stimulated inducible nitric oxide synthase (iNOS). Compound IIh also suppressed the induction of the pro-inflammatory cytokines tumor necrosis factor-α and interleukin-1β in LPS-stimulated RAW 264.7 cells. The anti-inflammatory activity of compound IIh was also found to be associated with the suppression of the Toll-like receptor (TLR)4 signaling pathway by down-regulating the activation of interferon regulatory factor 3 (IRF-3) and interferon-β and signal transducer expression. These findings demonstrate that novel phthalimides might be potential candidates for the development of anti-inflammatory agents.
Xie, H.,Xu, L.,Qin, L.,Huang, Y.,Wei, D.,Kim, S.I.,Seo, H.J. North-Holland 2014 Materials letters Vol.115 No.-
A novel orange-emitting tungstate of Eu<SUP>3+</SUP>-doped Ba<SUB>4</SUB>R<SUB>2</SUB>ZrWO<SUB>12</SUB> (R=La, Gd, Y) was successfully synthesized. The samples were characterized by X-ray powder diffraction (XRD) and scanning electron microscope (SEM). The luminescence properties such as photoluminescence (PL) excitation and emission spectra, decay curves, CIE color coordinates and quantum efficiency (QE) were investigated. The thermal stability was discussed from the luminescence decay and lifetimes. The <SUP>5</SUP>D<SUB>0</SUB>→<SUP>7</SUP>F<SUB>0</SUB> transition of Eu<SUP>3+</SUP> is abnormally stronger than the <SUP>5</SUP>D<SUB>0</SUB>→<SUP>7</SUP>F<SUB>1,2</SUB> transitions. The tungstate can be efficiently excited by UV and near-UV light and exhibits a bright orange luminescence. The luminescence mechanism was briefly discussed.
X. Qin,S. D. Zhang 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.12
The six doublet and the two quartet electronic states (2+(2), 2−, 2(2), 2, 4−, and 4)of the OH radical have been studied using the multi-reference configuration interaction (MRCI)method where the Davidson correction, core-valence interaction and relativistic effect are consideredwith large basis sets of aug-cc-pv5z, aug-cc-pcv5z, and cc-pv5z-DK, respectively. Potential energycurves (PECs) and dipole moment functions are also calculated for these states for internucleardistances ranging from 0.05 nm to 0.80 nm. All possible vibrational levels and rotational constantsfor the bound state X2 and A2+ of OH are predicted by numerical solving the radial Schr¨odingerequation through the Level program, and spectroscopic parameters, which are in good agreementswith experimental results, are obtained. Transition dipole moments between the ground state X2and other excited states are also computed using MRCI, and the transition probability, lifetime,and Franck-Condon factors for the A2+-X2 transition are discussed and compared with existingexperimental values.
Photo-induced environmental depletion processes of b-blockers in river waters
Liu, Qin-Tao,Cumming, Rob I.,Sharpe, Alan D. Korean Society of Photoscience 2009 Photochemical & photobiological sciences Vol.8 No.6
In order to improve the understanding of the fate and behaviour of pharmaceuticals in the environment there is a need to investigate in-stream depletion mechanisms, e.g. phototransformation of active pharmaceutical ingredients (APIs) in natural surface waters. In this study, abiotic and biotic degradation of selected $\beta$-blockers was measured simultaneously in non-sterilised and sterilised river waters and deionised water (DIW) under simulated sunlight ($\lambda$: 295.800 nm) and dark conditions, and at environmentally relevant concentrations, i.e. $\leq$ ppb levels. Results suggested that the overall degradation followed pseudo first order kinetics under the solar simulation conditions and was between two and ten times faster in river waters than in DIW. There was a significant correlation (p < 0.07) between dissolved organic carbon (DOC) and overall first order degradation rate constants for the tested b-blockers (n = 4-6), suggesting coloured DOC triplet-induced or reactive transient mediated oxidation mechanisms in river waters. Phototransformation was the main depletion mechanism for the b-blockers tested over a 2 to 7 day period. Slow hydrolysis was observed for metoprolol only. Loss due to biodegradation in river waters was not observed for propranolol but was found for metoprolol and atenolol at a very slow rate within the study period. However, biodegradation of metoprolol was accelerated under the light conditions, implying that photo-induced intermediates could be more easily biodegraded in river waters.