Homogeneous, high concentrated ceramic suspensions wi th low viscosity are the key controlling factors for the production of ceramic c omponents through colloidal processing. A well-dispersed suspension can be obta in...Homogeneous, high concentrated ceramic suspensions wi th low viscosity are the key controlling factors for the production of ceramic c omponents through colloidal processing. A well-dispersed suspension can be obta ined by choosing suitable dispersant, solvent, particle size distribution etc. B esides these factors, the homogenizing procedure is also a key step. In this paper, reaction sialon suspensions were prepared using 3-wt% KD1 as dis persant in organic media composed of 60-vol% methyletheylketone and 40-vol% et hanol. Different homogenizing procedures have been used and compared, including planetary milling, low energy ball milling and ultrasonic disaggregation. The ef fects of different homogenizing routes and mixing times on the rheology and stab ility of suspensions, and on the microstructure of slip casting green bodies, ha ve been studied. The varying dispersion efficiencies observed could be attribute d to differences in deagglomeration degrees achieved and in adsorption amount of dispersant onto the surface of reaction sialon powders.展开更多
本文研究了三七叶总皂苷酶解产物EP-3的抗抑郁药效。采用强迫游泳、悬尾、获得性无助、利血平拮抗等行为模型以及甩头实验、奔跑实验、打斗实验进行评价。强迫游泳实验，EP-3可以使强迫游泳小鼠的不动时间缩短43.39~52.00%，具有明显的...本文研究了三七叶总皂苷酶解产物EP-3的抗抑郁药效。采用强迫游泳、悬尾、获得性无助、利血平拮抗等行为模型以及甩头实验、奔跑实验、打斗实验进行评价。强迫游泳实验，EP-3可以使强迫游泳小鼠的不动时间缩短43.39~52.00%，具有明显的抗抑郁活性。获得性无助实验，EP-3能显著减少获得性无助小鼠的逃避失败次数，测定的第2 d EP-3给药组逃避失败次数减少了16.56~29.96%，测定的第3 d减少了20.06~35.28%，第4 d为29.63~62.82%，呈现出随给药时间延长，作用增强的特点。EP-3可以明显逆转利血平诱导的小鼠肛温下降和拮抗小鼠眼睑下垂，一定程度上缓解小鼠运动不能症状。此外，EP-3显著增加5-HTP诱导的小鼠甩头次数，减少可乐定诱导的小鼠打斗行为，提高L-Dopa诱导的小鼠奔跑速度。但是EP-3对悬尾实验小鼠的不动时间没有影响（P〉0.05）。EP-3具有良好的抗抑郁作用，其作用机制可能与5-HT、NE和DA等单胺能神经递质或其受体有关。展开更多
文摘Homogeneous, high concentrated ceramic suspensions wi th low viscosity are the key controlling factors for the production of ceramic c omponents through colloidal processing. A well-dispersed suspension can be obta ined by choosing suitable dispersant, solvent, particle size distribution etc. B esides these factors, the homogenizing procedure is also a key step. In this paper, reaction sialon suspensions were prepared using 3-wt% KD1 as dis persant in organic media composed of 60-vol% methyletheylketone and 40-vol% et hanol. Different homogenizing procedures have been used and compared, including planetary milling, low energy ball milling and ultrasonic disaggregation. The ef fects of different homogenizing routes and mixing times on the rheology and stab ility of suspensions, and on the microstructure of slip casting green bodies, ha ve been studied. The varying dispersion efficiencies observed could be attribute d to differences in deagglomeration degrees achieved and in adsorption amount of dispersant onto the surface of reaction sialon powders.
文摘本文研究了三七叶总皂苷酶解产物EP-3的抗抑郁药效。采用强迫游泳、悬尾、获得性无助、利血平拮抗等行为模型以及甩头实验、奔跑实验、打斗实验进行评价。强迫游泳实验，EP-3可以使强迫游泳小鼠的不动时间缩短43.39~52.00%，具有明显的抗抑郁活性。获得性无助实验，EP-3能显著减少获得性无助小鼠的逃避失败次数，测定的第2 d EP-3给药组逃避失败次数减少了16.56~29.96%，测定的第3 d减少了20.06~35.28%，第4 d为29.63~62.82%，呈现出随给药时间延长，作用增强的特点。EP-3可以明显逆转利血平诱导的小鼠肛温下降和拮抗小鼠眼睑下垂，一定程度上缓解小鼠运动不能症状。此外，EP-3显著增加5-HTP诱导的小鼠甩头次数，减少可乐定诱导的小鼠打斗行为，提高L-Dopa诱导的小鼠奔跑速度。但是EP-3对悬尾实验小鼠的不动时间没有影响（P〉0.05）。EP-3具有良好的抗抑郁作用，其作用机制可能与5-HT、NE和DA等单胺能神经递质或其受体有关。
