The Physiological Response of Synsepalum dulcifcum Denill Leaves to NaCl Stress

为明确神秘果(Synsepalum dulcifcum Denill)的耐盐能力,研究其在NaCl胁迫下的适应机制并丰富果树的耐盐机理,通过盆栽试验法,以0、2‰、4‰、6‰、8‰NaCl溶液分别对幼苗进行胁迫处理,测定叶片叶绿素、渗透调节物质、抗氧化物酶、丙二醛含量及土壤实际盐度。结果表明:在NaCl胁迫下,神秘果叶片的叶绿素合成受到明显抑制;超氧化物歧化酶(SOD)和过氧化物酶(POD)的活性随浓度增加而显著升高,过氧化氢酶(CAT)活性则是先升后降,在4‰时达到最高;可溶性蛋白含量与处理浓度呈负相关;脯氨酸、可溶性糖含量和对照相比有显著增加,推测脯氨酸和可溶性糖在胁迫过程中起着重要的渗透调节作用。To clear the tolerance and adaptive mechanism of S. dulcifcum and to rich the theory about the salt tolerance mechanism of fruit trees. The potted plants were watered with 0, 2‰, 4‰, 6‰, 8‰ NaCl and the physiological characteristics including the changes about chlorophyll, soluble protein, soluble proline, soluble sugar,SOD, POD, CAT, MDA of NaCl stress in S. dulcifcum leaves were measured. The result showed that the chlorophyll synthesis was significantly restricted under NaCl stress. The activity of SOD or POD increased clearly with the NaCl concentration, and the CAT activity increased to a peak under 4‰ NaCl and then dropped. The content of soluble protein dropped under NaCl stress while that of proline, soluble sugar increased significantly. It was deduced that proline or soluble sugar working as osmotic potentials in cells played a key role in salt tolerance of S. dulcifcum.厦门市科技计划项目(No.3502Z20092023

一种亚微米压电柔性微动系统设计及性能分析

为获得精密直线运动输出，设计一种压电柔性微驱动系统，系统由压电致动器及柔性微动机构组成，在压电致动器驱动下系统具有亚微米级定位精度。基于柔性铰链导向、传动原理，设计了一种精密柔性微动机构，在此基础上提出了压电柔性微驱动系统设计方案。采用有限元法对系统进行了运动学分析、强度分析、动态分析，分析结果显示，系统具有定位精度高（最大定位误差为0.24 μm）、强度性能好、动态性能优良等优势。研究对微驱动系统研究及应用具有一定的参考价值