The Eu 3+ doped Na 24 As 2Mo 22 O 83 phosphor was prepared by solid state reaction from Na 3AsO 4·12H 2O?Na 2MoO 4·2H 2O and MoO 3,and characterized by using elemental analysis,infrared spectroscopy and powd...The Eu 3+ doped Na 24 As 2Mo 22 O 83 phosphor was prepared by solid state reaction from Na 3AsO 4·12H 2O?Na 2MoO 4·2H 2O and MoO 3,and characterized by using elemental analysis,infrared spectroscopy and powder X ray diffractometry.According to our measurements with X ray diffraction,this material belongs to orthorhombic system with its lattice contants:a=1.4824nm,b=1.1902nm,c=1.1042nm,that are consistent with space group D 4 2 P2 12 12 1(No.19).The emission and excitation spectra were also measured.The luminescence properties of Eu 3+ doped Na 24 As 2Mo 22 O 83 and energy transfer mechanism were discussed.展开更多
The blood-brain barrier permeability of 20（S） and 20（R）-protopanaxatriol epimers and dammar-20（22）E,24-diene- 313,6α,12β-triol were investigated using the MDCK-pHaMDR cell monolayer model. The bidirectional pe...The blood-brain barrier permeability of 20（S） and 20（R）-protopanaxatriol epimers and dammar-20（22）E,24-diene- 313,6α,12β-triol were investigated using the MDCK-pHaMDR cell monolayer model. The bidirectional permeability tests were carried out, and the apparent permeability coefficients （Papp） were calculated. The two protopanaxatriol epimers showed good permeability with Papp values of-10^-5 cm/s, whereas dammar-20（22）E,24-diene-3β,6α, 12β-triol showed poor permeability with Papp of 〈1 × 10^-7 cm/s. The three compounds showed differences in intracellular accumulations due to their different structures. Inhibition of P-gp with verapamil showed that the transport mechanisms in MDCK-pHaMDR cell monolayer for compounds 1 and 2 epimers were not only simple passive diffusion but also involving an effiux way mediated by P-gp. These findings provided new basis for the further study of compounds 1 and 2 acting on the brain.展开更多
文摘The Eu 3+ doped Na 24 As 2Mo 22 O 83 phosphor was prepared by solid state reaction from Na 3AsO 4·12H 2O?Na 2MoO 4·2H 2O and MoO 3,and characterized by using elemental analysis,infrared spectroscopy and powder X ray diffractometry.According to our measurements with X ray diffraction,this material belongs to orthorhombic system with its lattice contants:a=1.4824nm,b=1.1902nm,c=1.1042nm,that are consistent with space group D 4 2 P2 12 12 1(No.19).The emission and excitation spectra were also measured.The luminescence properties of Eu 3+ doped Na 24 As 2Mo 22 O 83 and energy transfer mechanism were discussed.
基金The National New Drug R&D Program(Grant No.2011BAI07B082009ZX09301-010)of China
文摘The blood-brain barrier permeability of 20（S） and 20（R）-protopanaxatriol epimers and dammar-20（22）E,24-diene- 313,6α,12β-triol were investigated using the MDCK-pHaMDR cell monolayer model. The bidirectional permeability tests were carried out, and the apparent permeability coefficients （Papp） were calculated. The two protopanaxatriol epimers showed good permeability with Papp values of-10^-5 cm/s, whereas dammar-20（22）E,24-diene-3β,6α, 12β-triol showed poor permeability with Papp of 〈1 × 10^-7 cm/s. The three compounds showed differences in intracellular accumulations due to their different structures. Inhibition of P-gp with verapamil showed that the transport mechanisms in MDCK-pHaMDR cell monolayer for compounds 1 and 2 epimers were not only simple passive diffusion but also involving an effiux way mediated by P-gp. These findings provided new basis for the further study of compounds 1 and 2 acting on the brain.
