STUDY ON BURDOCK STUNT VIROID (BSV)——THE DENATURING BEHAVIOR AND OCCURRENCE IN SEPARATE PLANT OF BSV RNA-1 AND RNA-2

By two-dimensional electrophoretic technique, it was confirmed that BSV RNA-1 and RNA-2 contained circular molecules and that they Were more stable than the ether viroids in thermodynamics. BSV RNAs extracted from individual diseased plants gave only one specific band on analytical polyacrylamide gel, either BSV RNA-1 or RNA-2. No plant which has yet been detected contained both. No variation whatever was observed in the electrophoresis mobility, even over a period of two and a half years for BSV RNA-1 and RNA-2.The calli developed from diseased leaves grew rather slowly compared with healthy ones. The replication of BSV RNA-1 in calli which had continuously grown for 6—8 months was evidenced by the distinct band of BSV RNA-1 on file gels.     

牛蒡矮化类病毒(BSV)的研究——BSV-RNAs的变性行为和在植株中的分别存在

本文用双向聚丙烯酰胺凝胶电泳技术,研究了BSV—RNAs的变性行为,进一步证实了它们具有环状分子结构。1980—1983年对BSV—RNAs在不同植株中分布的电泳分析证明,BSV—RNA—1和BSV—RNA—2分别存在于不同的植株中。从含BSV—RNA—1的病叶诱导的愈伤组织的生长比健叶的缓慢。BSV—RNA—1可在愈伤组织中连续复制8个月以上,表明它具有类病毒复制的特征。     

Co/C3N4 NTs复合纳米材料的制备及光催化性能

采用化学还原法将非贵金属钴纳米颗粒沉积到氮化碳纳米管（C₃N₄ NTs）内外管壁,制备了Co/C₃N₄ NTs复合光催化剂。使用多种分析表征手段对Co/C₃N₄ NTs的形貌和结构进行分析,并比较Co负载量对复合材料可见光光催化产氢性能的影响。结果表明,该金属-半导体异质结可有效增强光生电子-空穴的分离速率。经可见光照射2 h后,当Co负载量为质量分数5%时具有最佳产氢量,且产氢速率为纯C₃N₄ NTs的1.7倍。     

浅谈密度测定中的人为误差和习惯养成

实验课是高校培养高层次人才的重要手段,是学生把理论和实践相结合的重要通道.认真上好每一堂实验课,有意识地培养良好的实验习惯,对保证实验的正常进行、确保安全、防止差错有着不可忽视的作用.