A comparison of ^99mTc-CQDO and ^99mTc-CQDO-MeB has been made for biodistribution and pharmacokinetics,^99mTc-CQDO and its adducts of methaneboronic acid^99mTc-CQDO-MeB were prepared by the reduction of Na ^99mTcO4 wi...A comparison of ^99mTc-CQDO and ^99mTc-CQDO-MeB has been made for biodistribution and pharmacokinetics,^99mTc-CQDO and its adducts of methaneboronic acid^99mTc-CQDO-MeB were prepared by the reduction of Na ^99mTcO4 with SnCl2.2H2O in aqueous solution,Radiochemical purity of ^99mTc-CQDO and ^99mTc-CQDO-MeB determined by TLC were over 95% after extraction.Biodistributions of ^99mTc-CQDO and ^99mTc-CQDOMeB in mice demonstrated that both of them could be easily absorbed by myocardium,and the peak uptake of each were 10.83±2.2% ID/g and 11.84±1.69%ID/g,respectively.^99mTc-CQDO showed rapid clearance from myocardial tissue while ^99mTc-CQDO-MeB had long retention in heart muscle.The myocardial uptake of ^99mTc-CQDO was only 5.88±1.66%/g at 10min and the uptake of ^99mTc-CQDO-MeB was 7.42±0.17%ID/g at 60min.The elimination of each from blood has a biexponential pattern.the first T1/2 is 1.38 and 1.5min,pespectively.The partition coefficient of ^99mTc-CQDO and ^99mTc-CQDO-MeB were 20 and 25 at pH 7.40,respectively.展开更多
The synthesis for glasses series xFe<sub>2</sub>O<sub>3</sub>-(45-x)PbO-55P<sub>2</sub>O<sub>5</sub>, (with 0 ≤ x ≤ 20;mol%) carried out in a temperature (1050 ± ...The synthesis for glasses series xFe<sub>2</sub>O<sub>3</sub>-(45-x)PbO-55P<sub>2</sub>O<sub>5</sub>, (with 0 ≤ x ≤ 20;mol%) carried out in a temperature (1050 ± 10)°C, leads to obtaining transparent glasses, brown in color and with a non-hygroscopic appearance. The study of glasses dissolution rate, immersed in distilled water at 90°C for 24 days, indicates a considerable chemical durability. The increase in the Fe<sub>2</sub>O<sub>3</sub> content in the vitreous network to the detriment of PbO is a favorable factor for the chemical durability improvement. Different techniques have been used such as X-ray diffraction, infrared spectroscopy, DSC, SEM and density for the study of these glasses. These techniques have led to establish correlations between chemical and structural properties. Thus the results obtained confirmed the creation of P-O-M bonds (M = Pb, Fe) with a strongly covalent nature to the detriment of the hydrated P-O-P bonds and led to the formation, mainly, of pyrophosphate groups. The low melting point of Pb-O makes it possible to play an important role, at the same time, on the viscosity, on the equilibrium between the vitreous bath and the crystallites formed. The dissolution rate obtained is 100 times smaller than that of silicate glasses used as an alternative form for the vitrification of radioactive waste.展开更多
相同应用领域,不同时间、地点或设备检测到的数据域不一定完整.文中针对如何进行数据域间知识传递问题,提出相同领域的概率分布差异可用两域最小包含球中心点表示且其上限与半径无关的定理.基于上述定理,在原有支持向量域描述算法基础上...相同应用领域,不同时间、地点或设备检测到的数据域不一定完整.文中针对如何进行数据域间知识传递问题,提出相同领域的概率分布差异可用两域最小包含球中心点表示且其上限与半径无关的定理.基于上述定理,在原有支持向量域描述算法基础上,提出一种数据域中心校正的领域自适应算法,并利用人造数据集和KDD CUP 99入侵检测数据集验证该算法.实验表明,这种领域自适应算法具有较好的性能.展开更多
文摘A comparison of ^99mTc-CQDO and ^99mTc-CQDO-MeB has been made for biodistribution and pharmacokinetics,^99mTc-CQDO and its adducts of methaneboronic acid^99mTc-CQDO-MeB were prepared by the reduction of Na ^99mTcO4 with SnCl2.2H2O in aqueous solution,Radiochemical purity of ^99mTc-CQDO and ^99mTc-CQDO-MeB determined by TLC were over 95% after extraction.Biodistributions of ^99mTc-CQDO and ^99mTc-CQDOMeB in mice demonstrated that both of them could be easily absorbed by myocardium,and the peak uptake of each were 10.83±2.2% ID/g and 11.84±1.69%ID/g,respectively.^99mTc-CQDO showed rapid clearance from myocardial tissue while ^99mTc-CQDO-MeB had long retention in heart muscle.The myocardial uptake of ^99mTc-CQDO was only 5.88±1.66%/g at 10min and the uptake of ^99mTc-CQDO-MeB was 7.42±0.17%ID/g at 60min.The elimination of each from blood has a biexponential pattern.the first T1/2 is 1.38 and 1.5min,pespectively.The partition coefficient of ^99mTc-CQDO and ^99mTc-CQDO-MeB were 20 and 25 at pH 7.40,respectively.
文摘The synthesis for glasses series xFe<sub>2</sub>O<sub>3</sub>-(45-x)PbO-55P<sub>2</sub>O<sub>5</sub>, (with 0 ≤ x ≤ 20;mol%) carried out in a temperature (1050 ± 10)°C, leads to obtaining transparent glasses, brown in color and with a non-hygroscopic appearance. The study of glasses dissolution rate, immersed in distilled water at 90°C for 24 days, indicates a considerable chemical durability. The increase in the Fe<sub>2</sub>O<sub>3</sub> content in the vitreous network to the detriment of PbO is a favorable factor for the chemical durability improvement. Different techniques have been used such as X-ray diffraction, infrared spectroscopy, DSC, SEM and density for the study of these glasses. These techniques have led to establish correlations between chemical and structural properties. Thus the results obtained confirmed the creation of P-O-M bonds (M = Pb, Fe) with a strongly covalent nature to the detriment of the hydrated P-O-P bonds and led to the formation, mainly, of pyrophosphate groups. The low melting point of Pb-O makes it possible to play an important role, at the same time, on the viscosity, on the equilibrium between the vitreous bath and the crystallites formed. The dissolution rate obtained is 100 times smaller than that of silicate glasses used as an alternative form for the vitrification of radioactive waste.
文摘相同应用领域,不同时间、地点或设备检测到的数据域不一定完整.文中针对如何进行数据域间知识传递问题,提出相同领域的概率分布差异可用两域最小包含球中心点表示且其上限与半径无关的定理.基于上述定理,在原有支持向量域描述算法基础上,提出一种数据域中心校正的领域自适应算法,并利用人造数据集和KDD CUP 99入侵检测数据集验证该算法.实验表明,这种领域自适应算法具有较好的性能.