PREPARATION OF STRIPE-SHAPED DOMAIN STRUCTURE IN FERROELECTRIC LIQUID CRYSTAL AND THE FABRICATION OF SPATIAL LIGHT MODULATOR

The stripe-shaped domain (SSD) structure was prepared in the initial ferroelectric liquid crystal (FLC) alignment without the application of an external electric field, which was realized by the aligning layer modification through the doping of tin tetra-2, 4-dimethyl phenoxy phthalocyanine (SnPc) into the rubbed polyimide films. Atomic force microscopy was used to investigate the alignment films and the corresponding aligning ability was evaluated through the pre-tilt angle measurement. The memory capability and the contrast ratio of thus aligned SSFLC cells have been enhanced and improved with the appearance of the SSD structure. The electrically controlled 64×64 FLC spatial light modulator was fabricated using the improved ligning method, which proves valuable for the practical device fabrication.     

空洞型肺错构瘤1例并文献复习

@@肺错构瘤的发生率在肺部良性肿瘤中居于第1位,根据发生部位可分为肺实质型和支气管内型,后者易与肺癌及肺结核球混淆。近年我院收治1例,并结合文献进行分析,现报道如下。     

新型含醚结构噻唑类化合物的合成及其抑菌活性

根据活性基团拼接原理,以对羟基硫代苯甲酰胺和4,4,4-三氟-2-氯乙酰乙酸乙酯为原料,经环化反应制得中间体2-(4'-羟基)苯基-4-三氟甲基-5-噻唑甲酸乙酯(3);3与取代苄基氯或氯乙酸反应合成了5个新型的含醚结构噻唑类化合物(5a~5e),其结构经1H NMR,ESI-MS和元素分析表征。用离体平皿法考察了5a~5e对小麦赤霉病和纹枯病细菌的抑菌活性。结果表明,5a~5e均有一定的抑制活性。其中2-(4'-间氟苄氧基苯基)-4-三氟甲基噻唑-5-甲酸乙酯5c抑菌活性最好,对小麦赤霉病和纹枯病细菌的抑菌活性分别为37.8%和53.3%。