目的用酪氨酸吸收系数 E 法测定多酶片中胃蛋白酶与胰蛋白酶的含量。方法用不同型号的紫外分光光度计测定不同浓度的酪氨酸吸收度,计算出 E 值,用 E 值法测定胃蛋白酶和胰蛋白酶的活力单位数 U。结果测定胃蛋白酶时,可采用酪氨酸 E_(1cm...目的用酪氨酸吸收系数 E 法测定多酶片中胃蛋白酶与胰蛋白酶的含量。方法用不同型号的紫外分光光度计测定不同浓度的酪氨酸吸收度,计算出 E 值,用 E 值法测定胃蛋白酶和胰蛋白酶的活力单位数 U。结果测定胃蛋白酶时,可采用酪氨酸 E_(1cm.275nm)^(1%)=76.6(0.065mol/L 盐酸溶液);测定胰蛋白酶时可采用酪氨酸 E_(1cm.275nm)^(1%)=75.3(0.2mol/L 盐酸溶液)。结论结果准确,精密席高,操作简便,适用胃蛋白酶和胰蛋白酶的活力测定。展开更多
We derived an equation for saturation in carbonate reservoirs based on the electrical efficiency model in the case of lacking core data. Owing to the complex pore structure and strong heterogeneity in carbonate reserv...We derived an equation for saturation in carbonate reservoirs based on the electrical efficiency model in the case of lacking core data. Owing to the complex pore structure and strong heterogeneity in carbonate reservoirs, the relation between electrical efficiency and water porosity is either complex or linear. We proposed an electrical efficiency equation that accounts for the relation between electrical efficiency and water porosity. We also proposed a power-law relation between electrical efficiency and deep-formation resistivity and analyzed the factors controlling the error in the water saturation computations. We concluded that the calculation accuracy of the electrical efficiency is critical to the application of the saturation equation. The saturation equation was applied to the carbonate reservoirs of three wells in Iraq and Indonesia. For relative rock electrical efficiency error below 0.1, the water saturation absolute error is also below 0.1. Therefore, we infer that the proposed saturation equation generally satisfies the evaluation criteria for carbonate reservoirs.展开更多
High-pressure vapor-liquid equilibrium data for the binary systems of methyl propionate＋carbon dioxide and propyl propionate＋carbon dioxide were measured at pressure from 1.00 MPa to 12.00 MPa and temperature in the...High-pressure vapor-liquid equilibrium data for the binary systems of methyl propionate＋carbon dioxide and propyl propionate＋carbon dioxide were measured at pressure from 1.00 MPa to 12.00 MPa and temperature in the range from 313 K to 373 K. Experimental results were correlated with the Peng-Robinson equation of state with the two-parameter van der Waals mixing rule. At the same time, the Henry＇s coefficient, partial molar enthalpy change and partial molar entropy change of CO2 during dissolution at different temperature were also calculated.展开更多
文摘目的用酪氨酸吸收系数 E 法测定多酶片中胃蛋白酶与胰蛋白酶的含量。方法用不同型号的紫外分光光度计测定不同浓度的酪氨酸吸收度,计算出 E 值,用 E 值法测定胃蛋白酶和胰蛋白酶的活力单位数 U。结果测定胃蛋白酶时,可采用酪氨酸 E_(1cm.275nm)^(1%)=76.6(0.065mol/L 盐酸溶液);测定胰蛋白酶时可采用酪氨酸 E_(1cm.275nm)^(1%)=75.3(0.2mol/L 盐酸溶液)。结论结果准确,精密席高,操作简便,适用胃蛋白酶和胰蛋白酶的活力测定。
基金supported by the National Science and Technology Major Project(2011ZX05030)
文摘We derived an equation for saturation in carbonate reservoirs based on the electrical efficiency model in the case of lacking core data. Owing to the complex pore structure and strong heterogeneity in carbonate reservoirs, the relation between electrical efficiency and water porosity is either complex or linear. We proposed an electrical efficiency equation that accounts for the relation between electrical efficiency and water porosity. We also proposed a power-law relation between electrical efficiency and deep-formation resistivity and analyzed the factors controlling the error in the water saturation computations. We concluded that the calculation accuracy of the electrical efficiency is critical to the application of the saturation equation. The saturation equation was applied to the carbonate reservoirs of three wells in Iraq and Indonesia. For relative rock electrical efficiency error below 0.1, the water saturation absolute error is also below 0.1. Therefore, we infer that the proposed saturation equation generally satisfies the evaluation criteria for carbonate reservoirs.
文摘High-pressure vapor-liquid equilibrium data for the binary systems of methyl propionate＋carbon dioxide and propyl propionate＋carbon dioxide were measured at pressure from 1.00 MPa to 12.00 MPa and temperature in the range from 313 K to 373 K. Experimental results were correlated with the Peng-Robinson equation of state with the two-parameter van der Waals mixing rule. At the same time, the Henry＇s coefficient, partial molar enthalpy change and partial molar entropy change of CO2 during dissolution at different temperature were also calculated.
