白菜核不育两用系与玻里马胞质不育系及其保持系的性状比较分析

用比较分析的方法,对白菜核不育两用系与玻里马胞质不育系及其保持系的植株性状、育性、花器结构和花粉扫描电镜形态等进行观察研究.结果表明,玻里马不育系及其保持系的生长势强于核不育两用系,其中不育株的生长势强于可育株,且分枝数也较可育株多.两用系不育株的花蕾松软,花朵花冠较小,花丝短缩,花药戟形、褐色无粉,花粉粒空瘪畸形.玻里马不育系花蕾瘦瘪,花瓣皱缩,花色较淡,花粉粒多瘦瘪.两用系不育株花粉败育比玻里马不育系要明显,而花药败育则相反.两用系可育株与玻里马保持系花粉粒都比较饱满,保持系的网脊细,网眼大.实验还表明,该玻里马不育系转育容易,在大白菜、塌菜中可以找到恢复系.     

雏鸡谷胱甘肽水平对硒利用及胱甘肽过氧化物酶活性的影响

试验用谷胱甘肽(GSH)合成抑制剂—丁硫氨酸亚砜亚胺(B.S.O)降低雏鸡体内GSH水平,研究了GSH水平对亚硒酸钠硒利用的影响,及其与GSH—Px活性之间的关系。B.S.O经腹腔注入雏鸡体内后,明显地抑制了细胞内GSH的合成。血浆、肝脏GSH—Px活性随GSH降低而升高,肝脏GSH含量与血浆、肝脏GSH—Px活性呈负相关。注射不同硒水平硒和2mM/kg体重B.S.O组雏鸡肝脏GSH—Px活性高于相应硒水平组。在6ppmse水平,注射2mM/kg体重B.S.O,雏鸡肝、硒心聚集,呈多个小灶性坏死,表现出硒中毒症状和死亡(2/6)。GSH水平的降低似乎提高亚硒酸钠硒(se~(+4))生成GSH—Px的效能。     

Development of LVL frame structures using glued metal plate joints I: bond quality and joint performance of LVL-metal joints using epoxy resins

Bond quality and joint performance between laminated veneer lumber (LVL) and metal plates were investigated. Commercially fabricated LVL made of Douglas fir veneer and bonded with phenol-formaldehyde resin as well as three types of epoxy adhesives were used. Various surface preparations and treatments were applied to ordinary steel, stainless steel, and aluminum plates to remove the weak boundary layer that is incompatible with the resin and form a stable adherend layer that is chemically and mechanically compatible with the resin. Small specimens were tested in shear to search the most suitable metal surface for bonding with LVL. Generally, shear strength obtained for the specimens bonded with aluminum plates was lower than those bonded with ordinary steel plates. Among them chemically treated (ChT) and roughened (R) surfaces have demonstrated superior performance. To investigate strength performance and bond quality, LVL beams jointed with metal plates were tested while bending. The best results were obtained for specimens bonded with zinccoated metal plates, though good results were obtained also for ChT and R plates. However, the fracture proved to be fragile when no drift pins were used, even for high-performance surface treatments. The usage of drift pins was necessary to add toughness and avoid the brittle status of the fracture.     

大白菜隐性核不育材料9203A育性遗传的初步研究

从大白菜河头早自交系９２０３中发现的一株不育株,用该系中的可育株与之兄妹交育成的一个核不育两用系定名的９２０３ＡＢ,９２０３Ｂ自交Ｓ１代表现３（可）：１（不）育性比;用大白菜自交系９２０９与９２０３Ａ测交,Ｆ１代人武部植株恢复可育,Ｆ２代出现１５（可）１（不）育性比。这一遗传现象表明其育性与呈相对显隐性关系的３个育性基因Ｍｆ（可）〉ｍｆ（可）〉ｍｓ（不）或２个育性基因Ｍｆ（或）ｍｆ）〉ｍｓ和两对非     

藤壶幼虫附着的分子机理研究进展：转录组和蛋白质组

藤壶是一种重要的海洋污损生物,其在海洋工程设备表面的附着严重地影响着设备的使用,造成巨大的经济损失。发展环境友好的藤壶防除技术离不开对藤壶附着机理的深刻理解,而目前对于藤壶附着变态过程的调控机理尚未研究清楚。藤壶幼虫的附着涉及幼虫的生长发育、基底的探索、变态过程以及藤壶胶的分泌等多个复杂过程,传统的细胞生物学和分子生物学方法难以对这些过程进行详尽的分析。近年来,基于高通量测序技术的转录组学和蛋白质组学成为研究污损生物附着过程的重要手段,在揭示藤壶幼虫附着机理方面积累了大量的数据。本文综述了近年来国内外对于藤壶附着机理的研究,总结了利用组学方法研究藤壶幼虫的附着和变态过程、藤壶胶的成分和固化机理方面的研究进展,对未来防污技术的研究方向提出建议。