目的探讨氧糖剥夺并复氧培养后星形胶质细胞水肿及其水通道蛋白4(AQP4)表达的变化以及吡拉格雷(TSF)对其表达变化的影响。方法体外培养原代星形胶质细胞,建立氧糖剥夺/复氧细胞水肿模型,并随机分为正常组、氧糖剥夺/复氧损伤(OGD/Reox)...目的探讨氧糖剥夺并复氧培养后星形胶质细胞水肿及其水通道蛋白4(AQP4)表达的变化以及吡拉格雷(TSF)对其表达变化的影响。方法体外培养原代星形胶质细胞,建立氧糖剥夺/复氧细胞水肿模型,并随机分为正常组、氧糖剥夺/复氧损伤(OGD/Reox)组、奥扎格雷钠(Ozagrel)阳性对照组和TSF治疗组,在氧糖剥夺/复氧损伤后6、12、24和48 h 4个时间点测定细胞体积变化,乳酸脱氢酶(LDH)漏出率、MTT法检测细胞损伤及存活情况,Western blot法检测各组细胞膜AQP4蛋白的表达水平,RT-PCR法检测各组细胞AQP4 m RNA的转录水平。结果星形胶质细胞经缺氧再复氧处理,随着复氧时间的延长细胞损害加重(P<0.05,P<0.01);TSF治疗组的细胞体积明显低于OGD/Reox损伤组(P<0.05);给予TSF治疗后细胞在氧糖剥夺/复氧后的LDH漏出率较OGD/Reox损伤组明显降低(P<0.05);TSF治疗组与单纯氧糖剥夺/复氧相比较MTT检测细胞活力明显升高(P<0.05);给予TSF治疗组,AQP4表达明显降低(P<0.05);与Ozagrel相比较差异无显著性。Western blot及RT-PCR检测蛋白及m RNA的表达水平,给予TSF治疗组的AQP4蛋白及m RNA表达均明显降低(P<0.05)。结论TSF治疗能明显减轻体外氧糖剥夺/复氧损伤引起的星形胶质细胞水肿,可能是通过降低氧糖剥夺后AQP4的表达水平而实现。展开更多
The oxidative dehydrogenation （ODH） reactions of ethane and propane were investigated in a catalytic membrane reactor, incorporating oxygen-permeable membranes based upon La2Ni0.9V0.1O4＋δor Ba0.5Sr0.5Co0.8Fe0.2O3-...The oxidative dehydrogenation （ODH） reactions of ethane and propane were investigated in a catalytic membrane reactor, incorporating oxygen-permeable membranes based upon La2Ni0.9V0.1O4＋δor Ba0.5Sr0.5Co0.8Fe0.2O3-δ. As a compromise between the occurrence of a measureable oxygen flux and excessive homogenous gas phase reactions, the measurements were conducted at an intermediate temperature, either at 550 or 650 oC. The results show the dominating role of the oxygen flux across the membrane and available sites at the membrane surface in primary activation of the alkane and, hence, in achieving high alkane conversions. The experimental data of ODH of propane and ethane on both membrane materials can be reconciled on the basis of Mars-van Krevelen mechanism, in which the alkane reacts with lattice oxygen on the membrane surface to produce the corresponding olefin. It is further demonstrated that the oxygen concentration in the gas phase and on the membrane surface is crucial for determining the olefin selectivity.展开更多
The multi-stages humidifier semi-dry flue gas cleaning technology, the CRS plasma flue gas cleaning technology and oxidative additive flue gas cleaning technology were investigated for multi-pollutants removal. The se...The multi-stages humidifier semi-dry flue gas cleaning technology, the CRS plasma flue gas cleaning technology and oxidative additive flue gas cleaning technology were investigated for multi-pollutants removal. The semi-dry flue gas cleaning technology using multi-stages humidifier and additive can improve oxidation and absorption, and it can achieve high multi-pollutants removal efficiency. The CRS discharge can produce many OH radicals that promote NO oxidation. Combining NaOH absorption can achieve high deSO2 and deNO, efficiencies. It is fit for the reconstruction of primary wet flue gas desulfurization （WFGD）. In addition, using NaClO2 as additive in the absorbent of WFGD can obtain very high removal efficiency of SO2 and NOx.展开更多
The qualitative relationship between hydrogen concentration and notch tensile strength has been investigated for 5Ni-16Cr-Mo steel with different strength.The notch tensile strength was determined by means of slow str...The qualitative relationship between hydrogen concentration and notch tensile strength has been investigated for 5Ni-16Cr-Mo steel with different strength.The notch tensile strength was determined by means of slow strain rate test(SSRT)on circumferentially notched round bar specimens with the notch root radius of 0.15 mm after hydrogen charging.Meanwhile,the hydrogen diffusion behaviors of various strength steel were studied by thermal desorption spectroscopy(TDS)analysis.The SSRT results show that the T460 steel has higher susceptibility of hydrogen embrittlement in contrast with T520 steel.The activation energies and microstructure indicate that the dislocations and interfaces of martensitic laths are hydrogen traps in 5Ni-16Cr-Mo steel.By SSRT,the elastic limit of charged specimen loaded in air is higher than the flow stress without hydrogen charging before unloading,while the difference is defined as hydrogen-induced stress.The value of hydrogen-induced stress σ*increases linearly with hydrogen concentration:σ*=−0.622+2.015C0.The finite element analysis results of stress distributions near the notch tip have shown that the maximum principal stress increases with the notch root radius decreasing.展开更多
文摘目的探讨氧糖剥夺并复氧培养后星形胶质细胞水肿及其水通道蛋白4(AQP4)表达的变化以及吡拉格雷(TSF)对其表达变化的影响。方法体外培养原代星形胶质细胞,建立氧糖剥夺/复氧细胞水肿模型,并随机分为正常组、氧糖剥夺/复氧损伤(OGD/Reox)组、奥扎格雷钠(Ozagrel)阳性对照组和TSF治疗组,在氧糖剥夺/复氧损伤后6、12、24和48 h 4个时间点测定细胞体积变化,乳酸脱氢酶(LDH)漏出率、MTT法检测细胞损伤及存活情况,Western blot法检测各组细胞膜AQP4蛋白的表达水平,RT-PCR法检测各组细胞AQP4 m RNA的转录水平。结果星形胶质细胞经缺氧再复氧处理,随着复氧时间的延长细胞损害加重(P<0.05,P<0.01);TSF治疗组的细胞体积明显低于OGD/Reox损伤组(P<0.05);给予TSF治疗后细胞在氧糖剥夺/复氧后的LDH漏出率较OGD/Reox损伤组明显降低(P<0.05);TSF治疗组与单纯氧糖剥夺/复氧相比较MTT检测细胞活力明显升高(P<0.05);给予TSF治疗组,AQP4表达明显降低(P<0.05);与Ozagrel相比较差异无显著性。Western blot及RT-PCR检测蛋白及m RNA的表达水平,给予TSF治疗组的AQP4蛋白及m RNA表达均明显降低(P<0.05)。结论TSF治疗能明显减轻体外氧糖剥夺/复氧损伤引起的星形胶质细胞水肿,可能是通过降低氧糖剥夺后AQP4的表达水平而实现。
文摘The oxidative dehydrogenation （ODH） reactions of ethane and propane were investigated in a catalytic membrane reactor, incorporating oxygen-permeable membranes based upon La2Ni0.9V0.1O4＋δor Ba0.5Sr0.5Co0.8Fe0.2O3-δ. As a compromise between the occurrence of a measureable oxygen flux and excessive homogenous gas phase reactions, the measurements were conducted at an intermediate temperature, either at 550 or 650 oC. The results show the dominating role of the oxygen flux across the membrane and available sites at the membrane surface in primary activation of the alkane and, hence, in achieving high alkane conversions. The experimental data of ODH of propane and ethane on both membrane materials can be reconciled on the basis of Mars-van Krevelen mechanism, in which the alkane reacts with lattice oxygen on the membrane surface to produce the corresponding olefin. It is further demonstrated that the oxygen concentration in the gas phase and on the membrane surface is crucial for determining the olefin selectivity.
基金supported by NSF of Zhejiang (Y507079)EOP of Zhejiang (Y200702725)PSF of China (20080431325)
文摘The multi-stages humidifier semi-dry flue gas cleaning technology, the CRS plasma flue gas cleaning technology and oxidative additive flue gas cleaning technology were investigated for multi-pollutants removal. The semi-dry flue gas cleaning technology using multi-stages humidifier and additive can improve oxidation and absorption, and it can achieve high multi-pollutants removal efficiency. The CRS discharge can produce many OH radicals that promote NO oxidation. Combining NaOH absorption can achieve high deSO2 and deNO, efficiencies. It is fit for the reconstruction of primary wet flue gas desulfurization （WFGD）. In addition, using NaClO2 as additive in the absorbent of WFGD can obtain very high removal efficiency of SO2 and NOx.
基金Project(3220024018)supported by the Fundamental Research Funds for the Luoyang Sunrui Special Equipment Co.,Ltd.,China。
文摘The qualitative relationship between hydrogen concentration and notch tensile strength has been investigated for 5Ni-16Cr-Mo steel with different strength.The notch tensile strength was determined by means of slow strain rate test(SSRT)on circumferentially notched round bar specimens with the notch root radius of 0.15 mm after hydrogen charging.Meanwhile,the hydrogen diffusion behaviors of various strength steel were studied by thermal desorption spectroscopy(TDS)analysis.The SSRT results show that the T460 steel has higher susceptibility of hydrogen embrittlement in contrast with T520 steel.The activation energies and microstructure indicate that the dislocations and interfaces of martensitic laths are hydrogen traps in 5Ni-16Cr-Mo steel.By SSRT,the elastic limit of charged specimen loaded in air is higher than the flow stress without hydrogen charging before unloading,while the difference is defined as hydrogen-induced stress.The value of hydrogen-induced stress σ*increases linearly with hydrogen concentration:σ*=−0.622+2.015C0.The finite element analysis results of stress distributions near the notch tip have shown that the maximum principal stress increases with the notch root radius decreasing.
