Crop yield and quality are often limited by the amount of phosphate fertilizer added to infertile soils,a key limiting factor for sustainable development in modern agriculture.The polyphosphate kinase(ppk)gene-express...Crop yield and quality are often limited by the amount of phosphate fertilizer added to infertile soils,a key limiting factor for sustainable development in modern agriculture.The polyphosphate kinase(ppk)gene-expressing transgenic rice with a single-copy line(ETRS)is constructed to improve phosphate fertilizer utilization efficiency for phosphorus resource conservation.To investigate the potential mechanisms of the increased biomass in ETRS in low phosphate culture,ETRS was cultivated in a low inorganic phosphate(Pi)culture medium(15μmol/L Pi,LP)and a normal Pi culture medium(300μmol/L Pi,CP),respectively.After 89 d of cultivation in different concentrations of phosphate culture media,the total phosphorus,polyphosphate(polyP),biomass,photosynthetic rate,nonstructural carbohydrate(NSC)contents,related enzyme activities,and related gene expression levels were analyzed.The results showed that ETRS had a high polyP amount to promote the photosynthetic rate in LP,and its biomass was almost the same as the wild type(WT)in CP.The NSC content of ETRS in LP was higher than that of WT in LP,but slightly lower than that of WT in CP.PolyP notably promoted the sucrose phosphate synthase activities of ETRS and significantly down-regulated the expression levels of sucrose transporter genes(OsSUT3 and OsSUT4),resulting in inhibiting the transport of sucrose from shoot to root in ETRS.It was concluded that polyP can stimulate the synthesis of NSCs in LP,which improved the growth of ETRS and triggered the biological activities of ETRS to save phosphate fertilizer.Our study provides a new way to improve the utilization rate of phosphate fertilizer in rice production.展开更多
目的研究原发性高血压(essential hypertension,EH)患者11β-类固醇脱氢酶2(11 beta-hydroxysteroid dehydrogenase type 2,11β-HSD2)基因甲基化表达,探讨原发性高血压的发病机制。方法选取2018年1月至2019年6月在佳木斯医学院第一附...目的研究原发性高血压(essential hypertension,EH)患者11β-类固醇脱氢酶2(11 beta-hydroxysteroid dehydrogenase type 2,11β-HSD2)基因甲基化表达,探讨原发性高血压的发病机制。方法选取2018年1月至2019年6月在佳木斯医学院第一附属医院未经治疗的EH患者71例为EH组,选取我院体检的50例健康志愿者为正常对照组,应用甲基化特异性PCR(methylation specific PCR,MSP)方法检测所有入选研究对象11β-HSD2基因甲基化表达。结果EH组和对照组11β-HSD2基因甲基化表达比较,差异具有统计学意义(P<0.05)。结论11β-HSD2基因甲基化参与EH的发生。展开更多
Evaluation of hydrocracking catalyst CHC- l showed superior qualities of catalyst CHC- 1.When it was used for hydrocracking reaction, the yield of middle distillates (jet fuel and diesel fuel)can reach more than 71 m%...Evaluation of hydrocracking catalyst CHC- l showed superior qualities of catalyst CHC- 1.When it was used for hydrocracking reaction, the yield of middle distillates (jet fuel and diesel fuel)can reach more than 71 m%. When it was used for medium-pressure hydro-upgrading of Daqing FCC diesel fuel, diesel density was decreased by 0.0284-0.0365 g/cm3 (20℃). Cetane number increased by 7.8-10.5 and the contents of sulphur and nitrogen were remarkably reduced. The storage stability of the upgraded diesel was improved.展开更多
The effect of crystal size of USY zeolite on the performance of hydro-upgrading catalysts for treating catalytically cracked(FCC) LCO(light cycle oil) was studied.Three W-Ni catalysts supported on USY zeolites with di...The effect of crystal size of USY zeolite on the performance of hydro-upgrading catalysts for treating catalytically cracked(FCC) LCO(light cycle oil) was studied.Three W-Ni catalysts supported on USY zeolites with different crystal sizes and Al2O3 were prepared by impregnation method.The catalysts were characterized by XRD and BET methods,and evaluated in a micro-reactor using tetralin as the model compound and in an 100-mL hydrogenation test unit using FCC LCO as the feedstock.By contrast,catalyst made from smaller crystal-size USY zeolite had higher external surface area and shorter pore length,having more hydrogenation activity sites and short contact time of reactant molecules with acidity sites.The evaluation results showed that the catalyst prepared on the basis of small crystal-size USY zeolite had higher tetralin conversion and better hydro-upgrading performance for treating FCC LCO.展开更多
基金supported by the National Natural Science Foundation of China(Grant No.41871082)the Scientific Research Project of Ecological Environment Department of Jiangsu Province,China(Grant Nos.2020019 and 2021005)the National Special Program of Water Environment,China(Grant No.2017ZX07204002).
文摘Crop yield and quality are often limited by the amount of phosphate fertilizer added to infertile soils,a key limiting factor for sustainable development in modern agriculture.The polyphosphate kinase(ppk)gene-expressing transgenic rice with a single-copy line(ETRS)is constructed to improve phosphate fertilizer utilization efficiency for phosphorus resource conservation.To investigate the potential mechanisms of the increased biomass in ETRS in low phosphate culture,ETRS was cultivated in a low inorganic phosphate(Pi)culture medium(15μmol/L Pi,LP)and a normal Pi culture medium(300μmol/L Pi,CP),respectively.After 89 d of cultivation in different concentrations of phosphate culture media,the total phosphorus,polyphosphate(polyP),biomass,photosynthetic rate,nonstructural carbohydrate(NSC)contents,related enzyme activities,and related gene expression levels were analyzed.The results showed that ETRS had a high polyP amount to promote the photosynthetic rate in LP,and its biomass was almost the same as the wild type(WT)in CP.The NSC content of ETRS in LP was higher than that of WT in LP,but slightly lower than that of WT in CP.PolyP notably promoted the sucrose phosphate synthase activities of ETRS and significantly down-regulated the expression levels of sucrose transporter genes(OsSUT3 and OsSUT4),resulting in inhibiting the transport of sucrose from shoot to root in ETRS.It was concluded that polyP can stimulate the synthesis of NSCs in LP,which improved the growth of ETRS and triggered the biological activities of ETRS to save phosphate fertilizer.Our study provides a new way to improve the utilization rate of phosphate fertilizer in rice production.
文摘目的研究原发性高血压(essential hypertension,EH)患者11β-类固醇脱氢酶2(11 beta-hydroxysteroid dehydrogenase type 2,11β-HSD2)基因甲基化表达,探讨原发性高血压的发病机制。方法选取2018年1月至2019年6月在佳木斯医学院第一附属医院未经治疗的EH患者71例为EH组,选取我院体检的50例健康志愿者为正常对照组,应用甲基化特异性PCR(methylation specific PCR,MSP)方法检测所有入选研究对象11β-HSD2基因甲基化表达。结果EH组和对照组11β-HSD2基因甲基化表达比较,差异具有统计学意义(P<0.05)。结论11β-HSD2基因甲基化参与EH的发生。
文摘Evaluation of hydrocracking catalyst CHC- l showed superior qualities of catalyst CHC- 1.When it was used for hydrocracking reaction, the yield of middle distillates (jet fuel and diesel fuel)can reach more than 71 m%. When it was used for medium-pressure hydro-upgrading of Daqing FCC diesel fuel, diesel density was decreased by 0.0284-0.0365 g/cm3 (20℃). Cetane number increased by 7.8-10.5 and the contents of sulphur and nitrogen were remarkably reduced. The storage stability of the upgraded diesel was improved.
基金support from the China National Petroleum Corporation (CNPC) (2011B-2304-0305)
文摘The effect of crystal size of USY zeolite on the performance of hydro-upgrading catalysts for treating catalytically cracked(FCC) LCO(light cycle oil) was studied.Three W-Ni catalysts supported on USY zeolites with different crystal sizes and Al2O3 were prepared by impregnation method.The catalysts were characterized by XRD and BET methods,and evaluated in a micro-reactor using tetralin as the model compound and in an 100-mL hydrogenation test unit using FCC LCO as the feedstock.By contrast,catalyst made from smaller crystal-size USY zeolite had higher external surface area and shorter pore length,having more hydrogenation activity sites and short contact time of reactant molecules with acidity sites.The evaluation results showed that the catalyst prepared on the basis of small crystal-size USY zeolite had higher tetralin conversion and better hydro-upgrading performance for treating FCC LCO.
