A 1 846 bp cDNA is isolated from a human tonsil cell λgt 11 cDNA library (ATCC No. 37546) with mAb 5D4 reactive strongly with human B cell line 3D5, but weakly with human B cell line Daudi and human T cell line Jurka...A 1 846 bp cDNA is isolated from a human tonsil cell λgt 11 cDNA library (ATCC No. 37546) with mAb 5D4 reactive strongly with human B cell line 3D5, but weakly with human B cell line Daudi and human T cell line Jurkat as a probe. RT-PCR also shows a strong reaction in 3D5 cell and a weak reaction in Daudi and Jurkat cell for 5D4 mRNA. There is an open reading frame from 88 to 1 209 bp in 5D4 cDNA encoding a 374 AA protein. Both the Northern blot analysis and the two consecutive stop codens before start coden demonstrate that the cDNA is a full-length cDNA. Secondary structure prediction suggests that there are a region from 295 to 334 AA in the protein with strong hydrophobicity and a transmembrane helix region with high score from 313 to 334 AA with an orientation from the inside to the outside of the cell.展开更多
The vacuum ultraviolet (VUV) spectroscopic properties of praseodymium (Pr3+, 1at%) doped LaF3 nanocrystals/glass at room temperature and 20 K are reported. Two types of Pr3+ ions, those in LaF3 nanocrystals and those ...The vacuum ultraviolet (VUV) spectroscopic properties of praseodymium (Pr3+, 1at%) doped LaF3 nanocrystals/glass at room temperature and 20 K are reported. Two types of Pr3+ ions, those in LaF3 nanocrystals and those in the glass host, were excited to 4f 5d band by VUV using synchrotron radiation as an excitation source, and emissions of 1S0 → 1D2 (336 nm), 1S0 → 1I6 (397 nm ) of Pr3+ in the nanocrystals and emissions of 4f 5d → 3HJ, 3FJ of Pr3+ in the glass appeared at the same time. But unlike in the bulk sample crystals, emission of 3P0 → 3HJ, 3FJ as the second step of the quantum splitting (QS) of Pr3+ in the LaF3 nanocrystals was not observed at room temperature, which could be explained that Pr3+ ions in the glass absorbed the energy of 3P0 → 3H4 of Pr3+ in the nanocrystals. Two types of excitation spectra monitoring different emissions were also measured, so it could be observed that the lowest energy of 4f 5d band of Pr3+ in the nanocrystals was about 53 500 cm-1 (186 nm) and in the glass about 33 800 cm-1(295 nm), respectively. These emission and excitation spectra were contrasted to those of bulk sample crystals LaF3∶Pr3+.展开更多
We have investigated properties of the compound LuAlO3：Ce^3＋ associated with the Ce^3＋ 4f-5d transition by using the periodic density functional theory. A hybrid functional has been used for the 4f states and a con...We have investigated properties of the compound LuAlO3：Ce^3＋ associated with the Ce^3＋ 4f-5d transition by using the periodic density functional theory. A hybrid functional has been used for the 4f states and a constrained approach has been employed for the excited 5d state. It is found that the average distance between Ce^3＋ and the eight nearest-neighbor O atoms decrease by 0.05 A on going from 4f to 5d state. The calculated Stokes shift is in good agreement with experiment. Based on the optimized structure around Ce^3＋, the energy level scheme of the 5d states has been evaluated using the angular overlap model, in reasonable agreement with experiment.展开更多
基金The cDNA sepquence reported in this paper been accessd by GenBank with an accession numbeg FA043290
文摘A 1 846 bp cDNA is isolated from a human tonsil cell λgt 11 cDNA library (ATCC No. 37546) with mAb 5D4 reactive strongly with human B cell line 3D5, but weakly with human B cell line Daudi and human T cell line Jurkat as a probe. RT-PCR also shows a strong reaction in 3D5 cell and a weak reaction in Daudi and Jurkat cell for 5D4 mRNA. There is an open reading frame from 88 to 1 209 bp in 5D4 cDNA encoding a 374 AA protein. Both the Northern blot analysis and the two consecutive stop codens before start coden demonstrate that the cDNA is a full-length cDNA. Secondary structure prediction suggests that there are a region from 295 to 334 AA in the protein with strong hydrophobicity and a transmembrane helix region with high score from 313 to 334 AA with an orientation from the inside to the outside of the cell.
文摘The vacuum ultraviolet (VUV) spectroscopic properties of praseodymium (Pr3+, 1at%) doped LaF3 nanocrystals/glass at room temperature and 20 K are reported. Two types of Pr3+ ions, those in LaF3 nanocrystals and those in the glass host, were excited to 4f 5d band by VUV using synchrotron radiation as an excitation source, and emissions of 1S0 → 1D2 (336 nm), 1S0 → 1I6 (397 nm ) of Pr3+ in the nanocrystals and emissions of 4f 5d → 3HJ, 3FJ of Pr3+ in the glass appeared at the same time. But unlike in the bulk sample crystals, emission of 3P0 → 3HJ, 3FJ as the second step of the quantum splitting (QS) of Pr3+ in the LaF3 nanocrystals was not observed at room temperature, which could be explained that Pr3+ ions in the glass absorbed the energy of 3P0 → 3H4 of Pr3+ in the nanocrystals. Two types of excitation spectra monitoring different emissions were also measured, so it could be observed that the lowest energy of 4f 5d band of Pr3+ in the nanocrystals was about 53 500 cm-1 (186 nm) and in the glass about 33 800 cm-1(295 nm), respectively. These emission and excitation spectra were contrasted to those of bulk sample crystals LaF3∶Pr3+.
基金ACKNOWLEDGMENTS This work was supported by the National Natural Science Foundation of China （No.10804001 and No.11074003）, the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry, and the program for innovative research team in Anhui Normal University of China.
文摘We have investigated properties of the compound LuAlO3：Ce^3＋ associated with the Ce^3＋ 4f-5d transition by using the periodic density functional theory. A hybrid functional has been used for the 4f states and a constrained approach has been employed for the excited 5d state. It is found that the average distance between Ce^3＋ and the eight nearest-neighbor O atoms decrease by 0.05 A on going from 4f to 5d state. The calculated Stokes shift is in good agreement with experiment. Based on the optimized structure around Ce^3＋, the energy level scheme of the 5d states has been evaluated using the angular overlap model, in reasonable agreement with experiment.
