Comparative Proteomic Analysis of Arabidopsis thaliana Root in Response to Calcium under Aluminum Stress

近年来，酸雨已成为世界重大环境问题，它加速了土壤酸化，使土壤铝会以各种离子型态释放进入土壤溶液，对植物产生毒害。如今，铝毒已经成为一个世界性的限制酸性土壤上植物生长的主要因子。 钙对植物的生长具有重要的意义。许多的研究表明，钙能够缓解铝胁迫，但缓解的机制尚不清楚。目前对钙缓解铝胁迫机制的研究主要集中在Ca和Al的竞争性取代以及生理水平，但蛋白分子水平的研究几为空白。本实验以模式植物拟南芥（Arabidopsisthaliana）为材料运用差异蛋白组学的方法第一次从蛋白水平上全面地研究在钙的作用下受到铝胁迫的拟南芥蛋白的差异表达情况，初步探讨钙缓解铝毒害的机制。主要研究结果如下： （1）随着...Recent years, acid rain has become a major worldwide environmental issue. It accelerates the acidification of soils, and then makes Aluminum dissolve into soil in various ionic forms, toxic to plants. Now, Aluminum has been a major factor limiting plant growth in acid soils worldwide. Calcium plays a vital role in plant growth. Many studies show that Calcium can ameliorate the Aluminum toxicity, ...学位：理学硕士院系专业：生命科学学院生物学系_植物学学号：2172008115249

粉煤灰-矿粉-水泥三元胶凝材料对混凝土抗压强度的影响

为研究粉煤灰-矿粉-水泥三元胶凝材料对混凝土抗压强度的影响,测试混凝土标准养护3、7、14、28和56 d龄期的抗压强度,分析凝土抗压强度与胶凝材料各组分的关系。实验结果表明,混凝土抗压强度与粉煤灰-矿粉-水泥三元体系组分的掺量比例有密切关系。粉煤灰和矿粉双掺时,由于粒径不同会相互填充,从而产生超叠加效应,使掺加粉煤灰和矿粉的混凝土抗压强度得到明显改善。水泥、矿粉、水泥及粉煤灰的组合、粉煤灰和矿粉的组合对混凝土的抗压强度有增强作用,其中粉煤灰和矿粉的协同效应对混凝土抗压强度增强最为明显。随着龄期增加,粉煤灰和矿粉的协同效应对混凝土抗压强度的增强作用逐渐减弱,与28 d抗压强度相比,其对56 d抗压强度贡献降低了55.9%;粉煤灰及水泥-粉煤灰-矿粉的三元组合对混凝土抗压强度的影响逐渐降低,与28 d抗压强度相比,粉煤灰及水泥-粉煤灰-矿粉的三元组合对56 d抗压强度的降低效应分别减少了40.9%和67.3%。国家自然科学基金项目(51778551)福建省科技厅青年创新项目(2016J0514

石子级配对混凝土工作性的影响

基于研究石子级配对混凝土工作性的影响,对混料设计方法设计了10组三级配石子混凝土配合比,测试了不同石子级配的混凝土的坍落度和扩展度,并对测试结果进行优化。结果表明:石子级配对混凝土工作性有重要影响,良好的石子级配可有效改善混凝土的工作性。采用混料设计的方法设计的混凝土配合比,可在尽量少实验量的基础上快速有效得到满足工作性要求的石子比例

Experimental Investigations on Interaction of Two Drops by Thermocapillary-Buoyancy Migration

Experiments were performed, in a terrestrial environment, to study the migration and interaction of two drops with different diameters in matrix liquid under temperature gradient field. Pure soybean oil and silicon oil were used as matrix liquid and the drop liquid, respectively. The information on the motions of two drops was recorded by CCD camera system in the experiments to analyze the trajectories and velocities of the drops. Our experiments showed that, upon two drops approaching each other, the influence of the larger drop on the motion of the smaller one became significant. Meanwhile the smaller drop had a little influence on the larger one all the time. The oscillation of migration velocities of both drops was observed as they were approaching. For a short period the smaller drop even moved backward when it became side by side with the larger one during the migration. Although our experimental results on the behavior of two drops are basically consistent with the theoretical predictions, there are also apparent differences. 2006 Elsevier Ltd. All rights reserved. Keywords: Thermocapillary migration; Drop; Interaction; Oscillation 1. Introduction A bubble or drop will move when placed in another fluid with temperature gradient. This motion happens as a consequence of the variation of interfacial tension with temperature. Such a phenomenon is already known as Marangoni migration problem. With the development of microgravity science, bubble dynamics and droplet dynamics became a hot point problem of research because this investigation is very important for basic research as well as for applications in reduced gravity environment, such as space material science, chemical engineering and so on. Young et al. first investigated the thermocapillary migration o