Microscopic techniques were employed to investigate element enrichment characteristics in the vicinity of the interracial transition zone （[TZ） of MgO concrete. Results indicated that the morphology of products of h...Microscopic techniques were employed to investigate element enrichment characteristics in the vicinity of the interracial transition zone （[TZ） of MgO concrete. Results indicated that the morphology of products of hydration in 1TZ was similar to the cement matrix but different by amount, size and crystal features. Elements Ca, Si, AI and Mg were obviously enriched in ITZ and uniformity of their distribution grew with age. MgO was non- uniformly distributed in concrete, accounting for 8.47% and 4.53% respectively in paste and ITZ area despite of fully mixture in construction, yet MgO showed inclination of migrating towards ITZ area with in-depth hydration and the gap in between was mit- igated from 3.94% at 7 d to 1.31% at 240 d so far as 5% of light- burnt MgO was incorporated.展开更多
利用毕赤酵母GS115表达白地霉的脂肪酶基因,以离子交换法纯化的重组脂肪酶催化菜籽油水解,确定了最佳水解条件为温度42℃,水油比为1.5∶1,p H 8.0,酶用量为250 U/g,反应18 h水解率可达到40.1%。以水解得到的混合脂肪酸为原料,建立一种...利用毕赤酵母GS115表达白地霉的脂肪酶基因,以离子交换法纯化的重组脂肪酶催化菜籽油水解,确定了最佳水解条件为温度42℃,水油比为1.5∶1,p H 8.0,酶用量为250 U/g,反应18 h水解率可达到40.1%。以水解得到的混合脂肪酸为原料,建立一种尿素包合法富集α-亚麻酸的工艺。通过单因素试验对影响尿素包合富集效果的包合温度、时间、溶剂配比进行研究,由正交试验得到包合过程的最佳工艺条件为m(脂肪酸)∶m(尿素)∶V(乙醇)为1∶4∶20,包合温度-20℃、包合时间14 h,此条件可使其中α-亚麻酸的含量由8.03%提高至19.24%。展开更多
基金Supported by the Twelfth Five-year Science and Technology Support Program (2011BAE27B01)the National Natural Science Foundation of China(51139001, 51209022)China Central Non-profit Research Funds for Institutes (CKSF2012035/CL)
文摘Microscopic techniques were employed to investigate element enrichment characteristics in the vicinity of the interracial transition zone （[TZ） of MgO concrete. Results indicated that the morphology of products of hydration in 1TZ was similar to the cement matrix but different by amount, size and crystal features. Elements Ca, Si, AI and Mg were obviously enriched in ITZ and uniformity of their distribution grew with age. MgO was non- uniformly distributed in concrete, accounting for 8.47% and 4.53% respectively in paste and ITZ area despite of fully mixture in construction, yet MgO showed inclination of migrating towards ITZ area with in-depth hydration and the gap in between was mit- igated from 3.94% at 7 d to 1.31% at 240 d so far as 5% of light- burnt MgO was incorporated.
