The BF3/n-BuOH complexes were investigated as active species in catalyzing n-decene polymerization reaction.The structures of BF3/n-BuOH complexes were characterized not only by modern spectrum but also by calculation...The BF3/n-BuOH complexes were investigated as active species in catalyzing n-decene polymerization reaction.The structures of BF3/n-BuOH complexes were characterized not only by modern spectrum but also by calculation at theoretical level. The results confirmed that BF3/n-BuOH complexes changed from BF3·(n-BuOH)2 complexes to BF3·n-BuOH complexes with the mass fraction of BF3 increasing. These two complexes have different catalytic activity, but BF3·n-BuOH was superior. The highest n-decene conversion could reach 99% and the most excellent selectivity of n-decene trimer and tetramer could reach up to 80% yield by a series of controlled conditions. This work can help to understand the catalytic active species of n-decene polymerization and provide support for industrialization of poly-alpha-olefins(PAOs).展开更多
To editor:Hypertriglyceridemia is a major risk factor for cardiovascu-lar disease and acute pancreatitis.1Accordingly,during preg-nancy,the growing serum lipid levels have potentially critical implications.2,3However,...To editor:Hypertriglyceridemia is a major risk factor for cardiovascu-lar disease and acute pancreatitis.1Accordingly,during preg-nancy,the growing serum lipid levels have potentially critical implications.2,3However,the management of gestational hypertriglyceridemia is further complicated because of the lackof safety data for most of the lipid-lowering agents.展开更多
Preeclampsia(PE)is a principal cause of maternal and newborn mortality that poses financial and physical burdens to tens of thousands of families each year.Unfortunately,there is no effective management to arrest the ...Preeclampsia(PE)is a principal cause of maternal and newborn mortality that poses financial and physical burdens to tens of thousands of families each year.Unfortunately,there is no effective management to arrest the progression of this disease unless delivery.Therefore,standardized management or preventive treatments are needed urgently.PE is closely associated with placental hypoxia,which increases the secretion of soluble fms-like tyrosine kinase 1(sFlt-1)as well as soluble endoglin(sEng)into the maternal circulation.Metformin has been found to inhibit those anti-angiogenic factors so it might be a candidate to prevent or treat PE.Women who are diagnosed with gestational diabetes mellitus(GDM)are more likely to have complications of hypertension or PE,so this review aims to demonstrate that the application of metformin in GDM might prevent the onset or progression of PE complicated with GDM.展开更多
基金Support by National Key Research and Development Program of China(2017YFB0306701)State Key Laboratory Opening Project Foundation of Jilin University(2018-16).
文摘The BF3/n-BuOH complexes were investigated as active species in catalyzing n-decene polymerization reaction.The structures of BF3/n-BuOH complexes were characterized not only by modern spectrum but also by calculation at theoretical level. The results confirmed that BF3/n-BuOH complexes changed from BF3·(n-BuOH)2 complexes to BF3·n-BuOH complexes with the mass fraction of BF3 increasing. These two complexes have different catalytic activity, but BF3·n-BuOH was superior. The highest n-decene conversion could reach 99% and the most excellent selectivity of n-decene trimer and tetramer could reach up to 80% yield by a series of controlled conditions. This work can help to understand the catalytic active species of n-decene polymerization and provide support for industrialization of poly-alpha-olefins(PAOs).
文摘To editor:Hypertriglyceridemia is a major risk factor for cardiovascu-lar disease and acute pancreatitis.1Accordingly,during preg-nancy,the growing serum lipid levels have potentially critical implications.2,3However,the management of gestational hypertriglyceridemia is further complicated because of the lackof safety data for most of the lipid-lowering agents.
文摘Preeclampsia(PE)is a principal cause of maternal and newborn mortality that poses financial and physical burdens to tens of thousands of families each year.Unfortunately,there is no effective management to arrest the progression of this disease unless delivery.Therefore,standardized management or preventive treatments are needed urgently.PE is closely associated with placental hypoxia,which increases the secretion of soluble fms-like tyrosine kinase 1(sFlt-1)as well as soluble endoglin(sEng)into the maternal circulation.Metformin has been found to inhibit those anti-angiogenic factors so it might be a candidate to prevent or treat PE.Women who are diagnosed with gestational diabetes mellitus(GDM)are more likely to have complications of hypertension or PE,so this review aims to demonstrate that the application of metformin in GDM might prevent the onset or progression of PE complicated with GDM.
