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| 1 | Re-Os isotope geochemistry of three Chinese chondrites显示文摘Three Chinese ordinary chondrites,including Jilin (H5),Boxian (LL3.8) and Lujiang (LL6),have been studied for their Re and Os abundances and Os isotopic composition in whole-chondrite samples,separated magnetic and nonmagnetic fractions,and nodules. The results indicate that the Re and Os abundances of the whole-chondrite samples are in the ranges of corresponding H-and LL-Groups,respectively. The Re and Os abundances of magnetic fraction from Boxian and Lujiang are within the range of high-Os ⅡAB and ⅢAB irons,whereas those of nonmagnetic fractions of Boxian and Lujiang are lower than the whole-chondrite values. The Re and Os abundances of nodules in Jilin are in the range of the LL-Group. 187Re/188Os and 187Os/188Os ratios of the three whole chondrites are in the range of ordinary chondrites which locate around the isochron of ⅡAB+ⅢAB irons. 187Re/188Os and 187Os/188Os ratios of the magnetic and nonmagnetic fractions from Boxian have a larger difference. The nonmag-netic fraction of Lujiang may contain a recent addition of Re,which causes deviation of the 187Re/188Os ratio from the irons isochron. The Re and Os abundances of nodules in Jilin are lower than those of the whole-chondrite,but their 187Os/188Os ratios are higher than that of the whole chondrite. | ZHI XiaChen QIN Xie SHI RenDeng HONG JiAn | 2007 | Chinese Science Bulletin2007，52，16： | 0 |
| 2 | Binding and endocytosis of monoterbium transferrin by K562 cells显示文摘Using isotopic labeling of human serumapotransferrin, the binding and the endocytosis of monoter-bium transferrin (TbC-apotransferrin, TbC-apotransferrin-FeN) by K562 cells, a human leukemic cell line, have beeninvestigated. There are about (8.58±2.41)×105 binding sites per cell surface at 0℃. The association constant for TbC-apotransferrin binding is 4.1×107 mol-1·L, for TbC-apotransferrin-FeN 2.7×107 mol-1·L at 0℃. At pH 7.4, upon warming cells to 37℃, endocytosis starts. The rate constantsfor the endocytosis are about 0.97 min-1 and 0.31 min-1 and the endocytosis ratio reaches 56% and 80% for TbC-apotransferrin and TbC-apotransferrin-FeN, respectively. | ZHAO Chungui1, YANG Binsheng1,2, ZHANG Wei3, BAI Haijing2 & LIU Wen2 1. Institute of Biological Technology, Shanxi University, Taiyuan 030006, China 2. Institute of Molecular Science, Shanxi University, Taiyuan 030006, China 3. Chinese Institute of Radiation Protection, Taiyuan 030006, China Correspondence should be addressed to Yang Binsheng (e-mail: yangbs@sxu.edu.cn) | 2003 | Chinese Science Bulletin2003，48，2： | 0 |
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