Beishan region in Gansu was the preselected area for China's high-level radioactive waste(HLW) repository. In selecting and evaluating a new dump site, the tritium study is of great significance. The Xinchang-Xian...Beishan region in Gansu was the preselected area for China's high-level radioactive waste(HLW) repository. In selecting and evaluating a new dump site, the tritium study is of great significance. The Xinchang-Xiangyangshan preselected area in the Beishan area was taken as an example. This paper selects typical unit and tries to use the distribution characteristics of tritium in the soil to study the atmospheric precipitation infiltration recharge in this area. The results show: In this region, the spatial variability of the tritium content in surface soil is large; it is feasible to use bound tritium tracer method to study the theory of atmospheric precipitation infiltration recharge; the atmospheric precipitation infiltration has close relationship with the soil particle composition, salt content, mineral composition, water content and organic matter content. These results can provide important basis for developing the atmospheric precipitation infiltration recharge, groundwater numerical simulation, nuclide migration study and so on.展开更多
基于Hill动力学与Michaelis-Menten方程,建立理论模型研究发状分裂相关增强子1(Hairy and enhancer of split 1,Hes1)调控蛋白激酶B(Protein Kinase B,AKT)-鼠双微体2(Murine Double Minute2,MDM2)-抗癌基因p53(p53)-第10号染色体缺失...基于Hill动力学与Michaelis-Menten方程,建立理论模型研究发状分裂相关增强子1(Hairy and enhancer of split 1,Hes1)调控蛋白激酶B(Protein Kinase B,AKT)-鼠双微体2(Murine Double Minute2,MDM2)-抗癌基因p53(p53)-第10号染色体缺失的磷酸酶及张力蛋白同源的基因(Phosphatase and tensin homolog deleted on chromosome ten,PTEN)通路的一种物理机制.研究发现,Hes1通过与PTEN结合抑制PTEN表达,并调控AKT信号.表明了Hes1蛋白的合成,以及Hes1与PTEN相互作用调控AKT-MDM2-p53-PTEN通路信号,将会有效地控制细胞结果.Hes1作为AKT-MDM2-p53-PTEN信号通路中上游调节的重要因素,还可以在一定程度上通过影响p53蛋白功能,改变p53对肿瘤的抑制性.理论结果可用于预测Notch通路信号异常诱导的致癌性,并进一步揭示了Notch信号通路影响细胞AKT-MDM2-p53-PTEN通路的激活机制.展开更多
目的通过主动模拟肺(ASL5000)模拟吸气努力,评价肌肉压力指数(pressure muscle index,PMI)与反映吸气努力水平指标包括吸气肌肉呼吸做功比例(percent of inspiratory muscle work of breathing,WOBmus%)和吸气肌肉压力-时间积分比例(per...目的通过主动模拟肺(ASL5000)模拟吸气努力,评价肌肉压力指数(pressure muscle index,PMI)与反映吸气努力水平指标包括吸气肌肉呼吸做功比例(percent of inspiratory muscle work of breathing,WOBmus%)和吸气肌肉压力-时间积分比例(percent of inspiratory muscle pressure time product,PTPmus%)之间的相关性。方法基于ASL5000平台进行实验设计,模拟50个不同肺模型参数以及25个不同的压力支持(pressure support,PS)水平,共模拟1250例具有不同自主呼吸水平的患者。通过软件对采集到的流速、气道压和食道压-时间波形数据进行线下分析。使用Spearman相关性分析对PMI和WOBmus%、PTPmus%进行分析。结果不同PMI分组患者之间的PS水平、WOBmus%和PTPmus%差异均有统计学意义。并且随着PMI数值增加,PS水平以及驱动压力逐步下降,呼吸机做功也随之减小。PMI与WOBmus%的Spearman相关系数为0.874(P<0.001),PMI与PTPmus%的Spearman相关系数为0.875(P<0.001)。结论PMI与WOBmus%、PTPmus%之间具有良好相关性,PMI可能是指导PS水平设置的一种无创、有效的指标。关于PMI在不同临床情境下的适用性,及其指导PS水平设置的有效性,未来需要更多的研究进行调查。展开更多
基金supported by special project on decommission of nuclear facilities and disposal of radioactive wastes(SASTIND No.2 Department No.[2014]305)
文摘Beishan region in Gansu was the preselected area for China's high-level radioactive waste(HLW) repository. In selecting and evaluating a new dump site, the tritium study is of great significance. The Xinchang-Xiangyangshan preselected area in the Beishan area was taken as an example. This paper selects typical unit and tries to use the distribution characteristics of tritium in the soil to study the atmospheric precipitation infiltration recharge in this area. The results show: In this region, the spatial variability of the tritium content in surface soil is large; it is feasible to use bound tritium tracer method to study the theory of atmospheric precipitation infiltration recharge; the atmospheric precipitation infiltration has close relationship with the soil particle composition, salt content, mineral composition, water content and organic matter content. These results can provide important basis for developing the atmospheric precipitation infiltration recharge, groundwater numerical simulation, nuclide migration study and so on.
文摘基于Hill动力学与Michaelis-Menten方程,建立理论模型研究发状分裂相关增强子1(Hairy and enhancer of split 1,Hes1)调控蛋白激酶B(Protein Kinase B,AKT)-鼠双微体2(Murine Double Minute2,MDM2)-抗癌基因p53(p53)-第10号染色体缺失的磷酸酶及张力蛋白同源的基因(Phosphatase and tensin homolog deleted on chromosome ten,PTEN)通路的一种物理机制.研究发现,Hes1通过与PTEN结合抑制PTEN表达,并调控AKT信号.表明了Hes1蛋白的合成,以及Hes1与PTEN相互作用调控AKT-MDM2-p53-PTEN通路信号,将会有效地控制细胞结果.Hes1作为AKT-MDM2-p53-PTEN信号通路中上游调节的重要因素,还可以在一定程度上通过影响p53蛋白功能,改变p53对肿瘤的抑制性.理论结果可用于预测Notch通路信号异常诱导的致癌性,并进一步揭示了Notch信号通路影响细胞AKT-MDM2-p53-PTEN通路的激活机制.
文摘目的通过主动模拟肺(ASL5000)模拟吸气努力,评价肌肉压力指数(pressure muscle index,PMI)与反映吸气努力水平指标包括吸气肌肉呼吸做功比例(percent of inspiratory muscle work of breathing,WOBmus%)和吸气肌肉压力-时间积分比例(percent of inspiratory muscle pressure time product,PTPmus%)之间的相关性。方法基于ASL5000平台进行实验设计,模拟50个不同肺模型参数以及25个不同的压力支持(pressure support,PS)水平,共模拟1250例具有不同自主呼吸水平的患者。通过软件对采集到的流速、气道压和食道压-时间波形数据进行线下分析。使用Spearman相关性分析对PMI和WOBmus%、PTPmus%进行分析。结果不同PMI分组患者之间的PS水平、WOBmus%和PTPmus%差异均有统计学意义。并且随着PMI数值增加,PS水平以及驱动压力逐步下降,呼吸机做功也随之减小。PMI与WOBmus%的Spearman相关系数为0.874(P<0.001),PMI与PTPmus%的Spearman相关系数为0.875(P<0.001)。结论PMI与WOBmus%、PTPmus%之间具有良好相关性,PMI可能是指导PS水平设置的一种无创、有效的指标。关于PMI在不同临床情境下的适用性,及其指导PS水平设置的有效性,未来需要更多的研究进行调查。