A pot experiment was carried out on a marine saline soil to study the effect of initial soluble Na/Ca ratio of saline soil on the salinity tolerance of barley plant.The results showed that (1) the Na/Ca ratio affected...A pot experiment was carried out on a marine saline soil to study the effect of initial soluble Na/Ca ratio of saline soil on the salinity tolerance of barley plant.The results showed that (1) the Na/Ca ratio affected significantly the dry weight of the plant at an earlier stage of growth,the critical values of initial Na/Ca ratio at which the plant could grow normally on soils containing salts of 2.5,3.5 and 4.5g kg^-1 were 30,20 and 15,respectively;(2)smaller Na/Ca ratio resulted in a considerable decrease in Na accumulation but a great increase in K accumulation in the barley plant;and (3) the plasmallema of barley leaf were badly injured when the Na/Ca ratio was more than 30 and the increase of Na content of plant caused an exudation of K from the leaf cells.Some critical indexes were suggested for the cultivation of barley plant on marine saline soils and could be used as reference in the biological reclamation of marine saline soils.展开更多
Sec62/Sec63是位于内质网膜上的跨膜蛋白复合物,辅助新合成的前体蛋白或新生多肽链转运至内质网,进行后期的折叠加工。为研究Sec62/Sec63复合物对乙型脑炎病毒(JEV)复制的影响,本研究利用CRISPR/Cas9基因编辑技术分别构建SEC62、SEC63...Sec62/Sec63是位于内质网膜上的跨膜蛋白复合物,辅助新合成的前体蛋白或新生多肽链转运至内质网,进行后期的折叠加工。为研究Sec62/Sec63复合物对乙型脑炎病毒(JEV)复制的影响,本研究利用CRISPR/Cas9基因编辑技术分别构建SEC62、SEC63基因敲除的HEK-293细胞系,经测序鉴定以及western blot检测,获得两个基因敲除细胞系,分别命名为SEC62 KO HEK-293细胞和SEC63 KO HEK-293细胞。分别以MOI为1、0.05的JEV感染HEK-293、SEC62 KO HEK-293、SEC63 KO HEK-293细胞后,利用间接免疫荧光试验检测Sec62/Sec63复合物对JEV复制的影响。结果显示,不同剂量JEV感染SEC62 KO HEK-293细胞与SEC63 KO HEK-293细胞中荧光信号阳性细胞均少于HEK-293细胞对照组;以MOI为1的JEV感染HEK-293、SEC62 KO HEK-293、SEC63 KO HEK-293细胞后,经western blot检测,结果显示于感染后12 h、24 h和48 h,SEC62 KO HEK-293、SEC63 KO HEK-293细胞中均未检测出JEV E蛋白条带,而对照HEK-293细胞中JEV E蛋白的表达量逐渐增加。以MOI为1的JEV感染上述3种细胞后检测细胞培养液中病毒滴度,结果显示JEV感染12 h后SEC62 KO HEK-293、SEC63 KO HEK-293细胞与HEK-293细胞病毒滴度无差异(p>0.05),而感染后24 h与48 h时,SEC62 KO HEK-293、SEC63 KO HEK-293细胞培养液中病毒滴度均显著低于HEK-293细胞对照组(p<0.01)。以MOI为1、0.5、0.05的JEV感染上述3种细胞后检测48 h后细胞培养液中病毒滴度,结果显示SEC62 KO HEK-293、SEC63 KO HEK-293细胞培养液中病毒滴度均显著低于HEK-293细胞对照组(p<0.001)。以上结果表明,SEC62、SEC63基因敲除后均抑制了JEV的复制,也表明Sec62、Sec63是影响JEV在细胞内复制的重要宿主因子。本研究为进一步探究Sec62、Sec63等宿主因子对JEV复制的影响机制提供了参考依据。展开更多
An innovative technology,nitric acid pressure leaching of limonitic laterite ores,was proposed by our research team.The HNO3 regeneration is considerable significance for the improvement of the proposed technology and...An innovative technology,nitric acid pressure leaching of limonitic laterite ores,was proposed by our research team.The HNO3 regeneration is considerable significance for the improvement of the proposed technology and its commercial application,but it has not been systematically investigated.Herein,regenerating HNO3 from Ca(NO3)2 solution with low-cost H2SO4,and simultaneous synthesis of fibrous CaSO4·2H2O by-products were studied.As a theoretical basis,the solubility of CaSO4·2H2O in HNO3 medium is studied.It is concluded that the solubility of CaSO4·2H2O increases with increasing temperature or increasing HNO3 concentration,which has considerable guiding significance for the subsequent experimental research and analysis.Then,the effects of various factors on the residual Ca^2+ concentration of filtrate,the regenerated HNO3 concentration and the morphology of synthesized products are investigated using ICP-AES and SEM.And the effect mechanism is also analyzed.The results indicate the regenerated HNO3 concentration reaches 116 g/L with the residual Ca^2+ concentration being 9.7 g/L at the optimum conditions.Moreover,fibrous CaSO4·2H2O by-products with high aspect ratios(length,406.32μm;diameter,14.71μm;aspect ratio,27.62)can be simultaneously synthesized.展开更多
The pc—pH diagrams of the CaSO4-Ca(OH)2-H2O system and its two subsystems at 298.15 K were constructed according to the theory of thermodynamic equilibrium. The interaction characteristics between the solubility of C...The pc—pH diagrams of the CaSO4-Ca(OH)2-H2O system and its two subsystems at 298.15 K were constructed according to the theory of thermodynamic equilibrium. The interaction characteristics between the solubility of CaSO4(s) and Ca(OH)2(s) can be found out from the diagrams. CaSO4(s), Ca(OH)2(s) and solution coexist when the pH value of solution is about 13.2. CaSO4(s) with the minimum solubility of 0.411 g/L is in equilibrium with solution when the pH value is lower than 13.2, and Ca(OH)2(s) with the minimum solubility of 2.749 g/L is in equilibrium with solution at the pH value over 13.2, which provides a theoretical basis for the treatment and reuse of industrial wastewater, especially for the wastewater containing sulfate which can be treated by lime-milk neutralization.展开更多
Solubility of Ca in manganese and manganese alloys was measured under sealed conditions at 1350℃.The interaction coefficients of Al and Fe on Ca in Mn were evaluated with the exper- imental data.The standard free ene...Solubility of Ca in manganese and manganese alloys was measured under sealed conditions at 1350℃.The interaction coefficients of Al and Fe on Ca in Mn were evaluated with the exper- imental data.The standard free energy of liquid Ca in liquid Mn based on the 1 wt-% solu- tion standard was estimated as well.展开更多
文摘A pot experiment was carried out on a marine saline soil to study the effect of initial soluble Na/Ca ratio of saline soil on the salinity tolerance of barley plant.The results showed that (1) the Na/Ca ratio affected significantly the dry weight of the plant at an earlier stage of growth,the critical values of initial Na/Ca ratio at which the plant could grow normally on soils containing salts of 2.5,3.5 and 4.5g kg^-1 were 30,20 and 15,respectively;(2)smaller Na/Ca ratio resulted in a considerable decrease in Na accumulation but a great increase in K accumulation in the barley plant;and (3) the plasmallema of barley leaf were badly injured when the Na/Ca ratio was more than 30 and the increase of Na content of plant caused an exudation of K from the leaf cells.Some critical indexes were suggested for the cultivation of barley plant on marine saline soils and could be used as reference in the biological reclamation of marine saline soils.
文摘Sec62/Sec63是位于内质网膜上的跨膜蛋白复合物,辅助新合成的前体蛋白或新生多肽链转运至内质网,进行后期的折叠加工。为研究Sec62/Sec63复合物对乙型脑炎病毒(JEV)复制的影响,本研究利用CRISPR/Cas9基因编辑技术分别构建SEC62、SEC63基因敲除的HEK-293细胞系,经测序鉴定以及western blot检测,获得两个基因敲除细胞系,分别命名为SEC62 KO HEK-293细胞和SEC63 KO HEK-293细胞。分别以MOI为1、0.05的JEV感染HEK-293、SEC62 KO HEK-293、SEC63 KO HEK-293细胞后,利用间接免疫荧光试验检测Sec62/Sec63复合物对JEV复制的影响。结果显示,不同剂量JEV感染SEC62 KO HEK-293细胞与SEC63 KO HEK-293细胞中荧光信号阳性细胞均少于HEK-293细胞对照组;以MOI为1的JEV感染HEK-293、SEC62 KO HEK-293、SEC63 KO HEK-293细胞后,经western blot检测,结果显示于感染后12 h、24 h和48 h,SEC62 KO HEK-293、SEC63 KO HEK-293细胞中均未检测出JEV E蛋白条带,而对照HEK-293细胞中JEV E蛋白的表达量逐渐增加。以MOI为1的JEV感染上述3种细胞后检测细胞培养液中病毒滴度,结果显示JEV感染12 h后SEC62 KO HEK-293、SEC63 KO HEK-293细胞与HEK-293细胞病毒滴度无差异(p>0.05),而感染后24 h与48 h时,SEC62 KO HEK-293、SEC63 KO HEK-293细胞培养液中病毒滴度均显著低于HEK-293细胞对照组(p<0.01)。以MOI为1、0.5、0.05的JEV感染上述3种细胞后检测48 h后细胞培养液中病毒滴度,结果显示SEC62 KO HEK-293、SEC63 KO HEK-293细胞培养液中病毒滴度均显著低于HEK-293细胞对照组(p<0.001)。以上结果表明,SEC62、SEC63基因敲除后均抑制了JEV的复制,也表明Sec62、Sec63是影响JEV在细胞内复制的重要宿主因子。本研究为进一步探究Sec62、Sec63等宿主因子对JEV复制的影响机制提供了参考依据。
基金Project(2182040)supported by the Beijing Natural Science Foundation,ChinaProjects(51674026,51974025,U1802253)supported by the National Natural Science Foundation of ChinaProject(FRF-TT-19-001)supported by the Fundamental Research Funds for the Central Universities,China。
文摘An innovative technology,nitric acid pressure leaching of limonitic laterite ores,was proposed by our research team.The HNO3 regeneration is considerable significance for the improvement of the proposed technology and its commercial application,but it has not been systematically investigated.Herein,regenerating HNO3 from Ca(NO3)2 solution with low-cost H2SO4,and simultaneous synthesis of fibrous CaSO4·2H2O by-products were studied.As a theoretical basis,the solubility of CaSO4·2H2O in HNO3 medium is studied.It is concluded that the solubility of CaSO4·2H2O increases with increasing temperature or increasing HNO3 concentration,which has considerable guiding significance for the subsequent experimental research and analysis.Then,the effects of various factors on the residual Ca^2+ concentration of filtrate,the regenerated HNO3 concentration and the morphology of synthesized products are investigated using ICP-AES and SEM.And the effect mechanism is also analyzed.The results indicate the regenerated HNO3 concentration reaches 116 g/L with the residual Ca^2+ concentration being 9.7 g/L at the optimum conditions.Moreover,fibrous CaSO4·2H2O by-products with high aspect ratios(length,406.32μm;diameter,14.71μm;aspect ratio,27.62)can be simultaneously synthesized.
基金Project(2007BAC25B01) supported by the National Key Project of Scientific and Technical Supporting Programs Funded by Ministry of Science and Technology of China during the 11th Five-year Plan
文摘The pc—pH diagrams of the CaSO4-Ca(OH)2-H2O system and its two subsystems at 298.15 K were constructed according to the theory of thermodynamic equilibrium. The interaction characteristics between the solubility of CaSO4(s) and Ca(OH)2(s) can be found out from the diagrams. CaSO4(s), Ca(OH)2(s) and solution coexist when the pH value of solution is about 13.2. CaSO4(s) with the minimum solubility of 0.411 g/L is in equilibrium with solution when the pH value is lower than 13.2, and Ca(OH)2(s) with the minimum solubility of 2.749 g/L is in equilibrium with solution at the pH value over 13.2, which provides a theoretical basis for the treatment and reuse of industrial wastewater, especially for the wastewater containing sulfate which can be treated by lime-milk neutralization.
文摘Solubility of Ca in manganese and manganese alloys was measured under sealed conditions at 1350℃.The interaction coefficients of Al and Fe on Ca in Mn were evaluated with the exper- imental data.The standard free energy of liquid Ca in liquid Mn based on the 1 wt-% solu- tion standard was estimated as well.
