Optimizing highly porous fibrous ceramics, like bird’s nest structure, were obtained by vacuum impregnation method with mullite fibers and alumina sol as raw material. The influences of impregnation cycles on the pro...Optimizing highly porous fibrous ceramics, like bird’s nest structure, were obtained by vacuum impregnation method with mullite fibers and alumina sol as raw material. The influences of impregnation cycles on the property of the sample, such as porosity, compressive strength and room-temperature thermal conductivity were explored. The experimental results show that the 3D skeleton structure of the sample was constructed by the randomly arranged mullite fibers and inorganic particles. The content of alumina can be adjusted effectively by impregnation times and it increases with increasing impregnation cycles. The thermal conductivity and compressive strength can also be controlled via tailored impregnation cycles. The compressive strength of fibrous ceramic ranged from 1.03 MPa to 5.31 MPa, while the porosity decrease slightly from 85.3% to 73.8%. In the same time, the thermal conductivity increase from 0.037 W/(m·K) to 0.217 W/(m·K), indicating that the fibrous ceramic with high impressive and low thermal conductivity can be fabricated by impregnation method.展开更多
为探究诺尼果多糖对长期高脂膳食引起的代谢紊乱和肥胖的预防作用及其可能机制,该研究分别通过饲以高脂饲料建立高脂膳食小鼠模型和灌胃广谱抗生素建立伪无菌小鼠模型,分析比较诺尼果多糖干预对高脂膳食小鼠体质量、粪便总胆汁酸含量(To...为探究诺尼果多糖对长期高脂膳食引起的代谢紊乱和肥胖的预防作用及其可能机制,该研究分别通过饲以高脂饲料建立高脂膳食小鼠模型和灌胃广谱抗生素建立伪无菌小鼠模型,分析比较诺尼果多糖干预对高脂膳食小鼠体质量、粪便总胆汁酸含量(Total Bile Acid,TBA)和肠道菌群组成的影响。结果表明与高脂膳食组相比,诺尼果多糖组小鼠体质量降低11.91%,粪便总胆汁酸含量增加29.58%。但在伪无菌高脂膳食小鼠中,诺尼果多糖的上述作用未能有效发挥,说明肠道菌群在诺尼果多糖抑制高脂膳食小鼠体质量增长,促进小鼠粪便总胆汁酸排出中发挥关键作用。Spearman相关性分析结果表明,粪杆菌(Faecalibaculum)、杜氏乳杆菌(Dubosiella)、鼠杆菌(Muribaculaceae)等是在第4周和第12周均发挥促进TBA排出,抑制小鼠体质量增长作用的菌属。该研究结果表明,诺尼果多糖通过促进上述有益肠道菌的增殖,发挥促进高脂膳食小鼠TBA排出,抑制高脂膳食小鼠体质量增长的作用。展开更多
基金Funded by the National Natural Science Foundation of China(No.51772139)
文摘Optimizing highly porous fibrous ceramics, like bird’s nest structure, were obtained by vacuum impregnation method with mullite fibers and alumina sol as raw material. The influences of impregnation cycles on the property of the sample, such as porosity, compressive strength and room-temperature thermal conductivity were explored. The experimental results show that the 3D skeleton structure of the sample was constructed by the randomly arranged mullite fibers and inorganic particles. The content of alumina can be adjusted effectively by impregnation times and it increases with increasing impregnation cycles. The thermal conductivity and compressive strength can also be controlled via tailored impregnation cycles. The compressive strength of fibrous ceramic ranged from 1.03 MPa to 5.31 MPa, while the porosity decrease slightly from 85.3% to 73.8%. In the same time, the thermal conductivity increase from 0.037 W/(m·K) to 0.217 W/(m·K), indicating that the fibrous ceramic with high impressive and low thermal conductivity can be fabricated by impregnation method.
文摘为探究诺尼果多糖对长期高脂膳食引起的代谢紊乱和肥胖的预防作用及其可能机制,该研究分别通过饲以高脂饲料建立高脂膳食小鼠模型和灌胃广谱抗生素建立伪无菌小鼠模型,分析比较诺尼果多糖干预对高脂膳食小鼠体质量、粪便总胆汁酸含量(Total Bile Acid,TBA)和肠道菌群组成的影响。结果表明与高脂膳食组相比,诺尼果多糖组小鼠体质量降低11.91%,粪便总胆汁酸含量增加29.58%。但在伪无菌高脂膳食小鼠中,诺尼果多糖的上述作用未能有效发挥,说明肠道菌群在诺尼果多糖抑制高脂膳食小鼠体质量增长,促进小鼠粪便总胆汁酸排出中发挥关键作用。Spearman相关性分析结果表明,粪杆菌(Faecalibaculum)、杜氏乳杆菌(Dubosiella)、鼠杆菌(Muribaculaceae)等是在第4周和第12周均发挥促进TBA排出,抑制小鼠体质量增长作用的菌属。该研究结果表明,诺尼果多糖通过促进上述有益肠道菌的增殖,发挥促进高脂膳食小鼠TBA排出,抑制高脂膳食小鼠体质量增长的作用。
