SAM Mtases是从多种植物中分离到的一类S-腺苷-L-甲硫氨酸依赖性氧位甲基转移酶基因,该基因对植物体内木质素、类苯基丙烷、类黄酮类、生物碱和脂肪族化合物等许多次生代谢产物合成有直接的影响,并且在植物抗病、抗紫外线、杀虫、抗菌...SAM Mtases是从多种植物中分离到的一类S-腺苷-L-甲硫氨酸依赖性氧位甲基转移酶基因,该基因对植物体内木质素、类苯基丙烷、类黄酮类、生物碱和脂肪族化合物等许多次生代谢产物合成有直接的影响,并且在植物抗病、抗紫外线、杀虫、抗菌、植物激素生长和信号调节、植物共生、花粉管伸长和花粉生长等生理过程中起重要作用.该文总结了国内外已经克隆到的SAM Mtases同源基因的分离、分类及其功能,为进一步研究SAM Mtases基因在植物生理代谢调控中的地位及在植物抗性及药用成分育种上的应用提供参考.展开更多
A six-member cyclic carbonate with protected functional groups was synthesized from tetramethylolmethane,benzaldehyde and ethyl choroformate.Coplymerization of（D,L-lactide） with cyclic carbonate was carried out thro...A six-member cyclic carbonate with protected functional groups was synthesized from tetramethylolmethane,benzaldehyde and ethyl choroformate.Coplymerization of（D,L-lactide） with cyclic carbonate was carried out through conventional ring-opening polymerization using Sn（Oct）2 as the catalyst.The effects of different catalysts,polymerization time and monomer-to-catalyst molar ratio on the molecular weight were investigated.The methods of removing protected groups were studied.Results showed the protected groups were effectively removed via catalytic hydrogenation.（Poly（D,L-lactide-co-cycliccarbonate）s） with hydroxyl pendant functional groups was obtained.展开更多
文摘A six-member cyclic carbonate with protected functional groups was synthesized from tetramethylolmethane,benzaldehyde and ethyl choroformate.Coplymerization of（D,L-lactide） with cyclic carbonate was carried out through conventional ring-opening polymerization using Sn（Oct）2 as the catalyst.The effects of different catalysts,polymerization time and monomer-to-catalyst molar ratio on the molecular weight were investigated.The methods of removing protected groups were studied.Results showed the protected groups were effectively removed via catalytic hydrogenation.（Poly（D,L-lactide-co-cycliccarbonate）s） with hydroxyl pendant functional groups was obtained.
