摘要：采用Sanders公司的四打印头快速成型机进行了陶瓷部件的浆料打印成型实验 ,实际测试了所用四打印头快速成型机的打印工作条件 ,考察了石蜡和挥发性介质两种浆料技术路线 ,并采用石蜡为介质制备了钛酸钡陶瓷浆料 ,研究了其流变性能 .实验表明 ,虽然偶联剂的加入可以降低石蜡介质浆料的粘度 ,但是粘度足够低的可打印浆料的固相含量太低 [约 3 % (involume)以下 ] ,打印成型后不能完全烧结 ,因此 ,要通过打印成型出可完全烧结的陶瓷部件便只能采用挥发性液体作为浆料介质 。

摘要：Reproducibility of clinical output is important when investigating therapeutic efficacy in pre-clinical animal *** to its physiological relevance,a swine myocardial infarction(MI)model has been widely used to evaluate the effectiveness of stem cells or tissue-engineered constructs for ischemic heart *** methods are used to induce MI in the swine ***,it is difficult,using these approaches,to obtain a similar level of functional outcomes from a group of animals due to interpersonal variation,leading to increased experimental ***,in order to minimize human intervention,we developed an approach to use a customized occluder that has dimensional similarities with that of the coronary artery of animals in the case of the swine *** carried out angiography to measure the diameter of the middle left anterior descending artery of each individual animal to fabricate the customized occluder using a 3D-printing *** fabricated occluder contained a central hole smaller than that of the targeted middle left anterior descending artery to mimic an atherosclerotic coronary artery that has an approximately 20%blocked ***,the 3D-printed occluder can provide continuous blood flow through the central pore,indicating a high survival rate(88%)of up to 28 days *** method showed the possibility of creating consistent myocardial infarction induction as compared to the conventional representative closed-chest method(50%survival rate),thus highlighting how our method can have a profound effect on accelerating reliable experiments for developing new therapeutic approaches to ischemic heart diseases.

摘要：试验旨在评估产蛋鸡日粮中添加δ-氨基乙酰丙酸（ALA）和维生素C（VC）对蛋鸡生产性能、铁营养状况和蛋品质的影响。试验选择252只海兰褐色商品蛋鸡（57~63周龄）,采用2×3因子设计,饲喂2个水平VC（0和500mg·kg-1）、3个水平ALA（0、5和10mg·kg-1）。每个处理含7个重复,每个重复6只母鸡。试验结果表明,4～6周,日粮添加ALA和VC可显著提高产蛋量（P〈0.05）。红细胞压积（hCT）、总铁结合力（TIBC）、白细胞（WBC）、总蛋白和白蛋白浓度不受日粮处理组的影响。不过,观察到ALA和ALA与VC的交互影响,可提高红细胞、血红蛋白和血清铁浓度（P〈0.05）。此外,与不添加ALA的母鸡相比,添加ALA和VC可提高母鸡血淋巴细胞的百分比（P〈0.05）。而且,3～6周,ALA或VC有改善（P〈0.05）蛋黄颜色单位和白蛋白高度的单个效果。受ALA的影响,蛋壳颜色加深（P〈0.05）。试验结束时,添加VC也可提高（P〈0.05）哈夫单位。不过,ALA和VC都不能对蛋重、蛋壳断裂强度和蛋壳厚度产生影响。试验结果表明,日粮添加ALA和VC可改善产蛋母鸡铁营养状况和蛋品质。