高压下DPP-11超分子结构中的π-π相互作用

通过金刚石对顶砧(DAC)高压装置产生高压,利用原位高压同步辐射能量色散X射线衍射(EDXD)和同步辐射远红外光谱研究了压力对DPP-11[2,5-二-(11-十一醇基)-3,6-二-(2-噻吩基)-1,4-二酮吡咯并[3,4-c]吡咯]固体及其在水溶液中胶束体系的影响.实验结果表明,在准静水压条件下,DPP-11固体没有发生相变,但随着压力的增加,分子间的π-π相互作用明显增强.在DPP-11胶束中发现了DPP-11固体中新的远红外吸收峰,此峰随着压力的增加而蓝移,这是由于胶束中π共轭染料基团的π-π相互作用增强所致.

非小细胞肺癌组织中丝苏氨酸激酶11与细胞死亡调解子抗体表达检测的临床意义

目的探讨非小细胞肺癌组织中丝苏氨酸激酶11（STK11）、细胞死亡调解子抗体（BIM）表达检测的临床意义。方法选取2014年3月至2015年3月河北省胸科医院接收的非小细胞肺癌患者65例，收集切除后的非小细胞肺癌组织标本及癌旁正常组织。采用免疫组织化学技术对标本中STK11、BIM的表达进行研究。结果非小细胞肺癌组织中的STK11阳性表达率低于旁癌组织[63．08％（41／65）比92．31％（60／65）]（x^2=16．022，P〈0．05），非小细胞肺癌组织中的BIM的阳性表达率高于旁癌组织[61．54％（40／65）比21．54％（14／65）]（x^=21．413，P〈0．05）。淋巴结转移患者非小细胞肺癌组织中STK11阳性表达率显著低于未转移淋巴结患者[41．38％（12／29）比80．56％（29／36）]（P〈0．05）；Ⅰ～Ⅱ期患者非小细胞肺癌组织中STK11的阳性表达率显著高于Ⅲ～Ⅳ期[72．55％（37／51）比28．57％（4／14）]（P〈0．05）；高分化患者的非小细胞肺癌组织中STK11阳性表达率显著高于中分化、低分化[89．47％（17／19）比51．61％（16／31）、53．33％（8／15）]（P〈0．05）。腺癌患者非小细胞肺癌组织中STK11阳性率显著高于鳞癌[78．13％（25／32）比48．48％（16／33）]（P〈0．05）。Ⅰ～Ⅱ期的BIM阳性表达率显著高于Ⅲ～Ⅳ期[70．59％（36／51）比28．27％（4／14）]（P〈0．05）；高分化患者非小细胞肺癌组织阳性表达率显著高于中分化、低分化[89．47％（17／19）比45．16％（14／31）、60．oo％（9／15）]（P〈0．05）。腺癌BIM阳性率高于鳞癌[75．oo％（24／32）比48．48％（16／33）]（P〈O．05）。结论STK11、BIM表达水平可作为判定非小细胞肺癌转移及预后的生物学指标。

Interaction of {11■2} twin variants in hexagonal close-packed titanium

As multiple{11■2}twin variants are often formed during deformation in hexagonal close-packed (hcp)titanium, the twin-twin interaction structure has a profound influence on mechanical properties. In this paper, the twin-twin interaction structures of the{11■2}contraction twin in cold-rolled commercial purity titanium were studied by using electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM). Formation of the{11■2}twin variants was found to deviate the rank of Schmid factor,and the non-Schmid behavior was explained by the high-angle grain boundary nucleation mechanism.All the observed twin-twin pairs manifested a quilted-looking structure, which consists of the incoming twins being arrested by the obstacle twins. Furthermore, the quilted-looking{11■2}twin-twin boundary was revealed by TEM and high resolution TEM observations. De-twinning, lattice rotation and curved twin boundary were observed in the obstacle twin due to the twin-twin reaction with the impinging twin. A twin-twin interaction mechanism for the{11■2}twin variants was proposed in terms of the dislocation dissociation, which will enrich the understanding for the propagation of twins and twinning-induced hardening in hcp metals and alloys.