目的:通过Meta分析方法定量评估甘油三酯-葡萄糖(TyG)指数与脑卒中发病风险之间的关系。方法:计算机检索中国知网、万方数据库、维普网、中国生物医学文献数据库、PubMed、Embase和Web of Science等数据库中公开发表的TyG指数与脑卒中...目的:通过Meta分析方法定量评估甘油三酯-葡萄糖(TyG)指数与脑卒中发病风险之间的关系。方法:计算机检索中国知网、万方数据库、维普网、中国生物医学文献数据库、PubMed、Embase和Web of Science等数据库中公开发表的TyG指数与脑卒中发病风险关系的前瞻性队列研究,检索时间为自建库至2024年11月7日。由两位研究员使用纽卡斯尔-渥太华量表(NOS)进行文献质量评价后提取纳入文献的相关数据。应用Stata 17.0软件进行统计分析。结果:共纳入17项前瞻性队列研究,449210例研究对象,其中包括28506例脑卒中患者。Meta分析结果显示,TyG指数与脑卒中发病风险呈正相关(HR=1.60,95%CI:1.45~1.76,P<0.05)。剂量-反应Meta分析结果显示,TyG指数与脑卒中发病风险呈线性正相关,TyG指数每升高1个单位,脑卒中发病风险增加20.2%。本研究所纳入文献不存在发表偏倚(Egger's检验P值为0.962,Begg's检验P值为0.967)。结论:TyG指数与脑卒中发病风险呈线性剂量-反应关系,较高的TyG指数增加脑卒中发病风险。展开更多
The new nanosolid superacid catalyst SO42-/TiO2 is compounded with nanometer chemical technology. This catalyst SO42-/TiO2 has good catalytic effects on esterificational reactions of ethylic acid and ethyl alcohol. It...The new nanosolid superacid catalyst SO42-/TiO2 is compounded with nanometer chemical technology. This catalyst SO42-/TiO2 has good catalytic effects on esterificational reactions of ethylic acid and ethyl alcohol. It has many other advantages such as strong water proof quality, being able to be used repeatedly, being easy to be reclaimed, non corroding, non polluting. So it is a green industrial catalyst which is helpful to the environment and possesses wide prospect of applications. The crystallo process, specific surface area and sulphur content of the SO42-/TiO2 system have been studied with the method of XRD, XPS and the chemical analysis, the result of which indicates that catalytic activity and acid strength of SO42-/TiO2 is affected by the H2SO4 saturant concentration, baking temperature, precipitating condition, specific surface area and sulphur content. The best preparation conditions of SO42-/TiO2 are: ageing temperature at 0℃, 0.5mol·L-1 of H2SO4 concentration, baking temperature at 500℃and 3 hours of baking time.展开更多
文摘目的:通过Meta分析方法定量评估甘油三酯-葡萄糖(TyG)指数与脑卒中发病风险之间的关系。方法:计算机检索中国知网、万方数据库、维普网、中国生物医学文献数据库、PubMed、Embase和Web of Science等数据库中公开发表的TyG指数与脑卒中发病风险关系的前瞻性队列研究,检索时间为自建库至2024年11月7日。由两位研究员使用纽卡斯尔-渥太华量表(NOS)进行文献质量评价后提取纳入文献的相关数据。应用Stata 17.0软件进行统计分析。结果:共纳入17项前瞻性队列研究,449210例研究对象,其中包括28506例脑卒中患者。Meta分析结果显示,TyG指数与脑卒中发病风险呈正相关(HR=1.60,95%CI:1.45~1.76,P<0.05)。剂量-反应Meta分析结果显示,TyG指数与脑卒中发病风险呈线性正相关,TyG指数每升高1个单位,脑卒中发病风险增加20.2%。本研究所纳入文献不存在发表偏倚(Egger's检验P值为0.962,Begg's检验P值为0.967)。结论:TyG指数与脑卒中发病风险呈线性剂量-反应关系,较高的TyG指数增加脑卒中发病风险。
文摘The new nanosolid superacid catalyst SO42-/TiO2 is compounded with nanometer chemical technology. This catalyst SO42-/TiO2 has good catalytic effects on esterificational reactions of ethylic acid and ethyl alcohol. It has many other advantages such as strong water proof quality, being able to be used repeatedly, being easy to be reclaimed, non corroding, non polluting. So it is a green industrial catalyst which is helpful to the environment and possesses wide prospect of applications. The crystallo process, specific surface area and sulphur content of the SO42-/TiO2 system have been studied with the method of XRD, XPS and the chemical analysis, the result of which indicates that catalytic activity and acid strength of SO42-/TiO2 is affected by the H2SO4 saturant concentration, baking temperature, precipitating condition, specific surface area and sulphur content. The best preparation conditions of SO42-/TiO2 are: ageing temperature at 0℃, 0.5mol·L-1 of H2SO4 concentration, baking temperature at 500℃and 3 hours of baking time.
文摘采用改性技术合成了新型的纳米固体超强酸催化剂S2O82-/ZrO2,该催化剂对醋酸和脂肪醇的酯化反应具有很好的催化作用,并且具有耐水性强、稳定性好、再生容易、可重复使用、不腐蚀设备、不污染环境等优点,是对环境友好的很有应用前景的绿色工业催化剂.用X射线衍射分析、X光电子能谱、TEM、红外光谱和化学分析等手段对S2O82-/ZrO2进行了表征.结果表明,浸渍液(NH4)2S2O8浓度、陈化温度、焙烧温度、沉淀条件、比表面积和含硫量均明显影响S2O82-/ZrO2的酸强度及催化活性.S2O82-/ZrO2最佳制备条件:陈化温度为-15℃,浸渍液(NH4)2S2O8浓度为0.5 mol/L,焙烧温度为600℃,焙烧时间为3 h.
