山海关林场灌丛的聚类与排序

本文应用模糊聚类分析和主成分分析的方法对山海关林场的灌丛进行分类。经过分析和比较,划分出11个群系,17个群丛组。     

山杨,大青杨,毛白杨组织培养的研究

以辽宁大学校园栽培的毛白杨和铁岭县山区栽培的山杨、大青杨嫩叶、新梢为材料，经消毒接种到相应的培养基上。材料经初代培养、继代培养和生根培养，最后，形成再生植株，其新梢接种在生根培养基上，经培养直接生根，形成完整植株，生根率可达９５％以上。     

Functional metagenomic profiling of nine biomes

Microbial activities shape the biogeochemistry of the planet and macroorganism health. Determining the metabolic processes performed by microbes is important both for understanding and for manipulating ecosystems (for example, disruption of key processes that lead to disease, conservation of environmental services, and so on). Describing microbial function is hampered by the inability to culture most microbes and by high levels of genomic plasticity. Metagenomic approaches analyse microbial communities to determine the metabolic processes that are important for growth and survival in any given environment. Here we conduct a metagenomic comparison of almost 15 million sequences from 45 distinct microbiomes and, for the first time, 42 distinct viromes and show that there are strongly discriminatory metabolic profiles across environments. Most of the functional diversity was maintained in all of the communities, but the relative occurrence of metabolisms varied, and the differences between metagenomes predicted the biogeochemical conditions of each environment. The magnitude of the microbial metabolic capabilities encoded by the viromes was extensive, suggesting that they serve as a repository for storing and sharing genes among their microbial hosts and influence global evolutionary and metabolic processes.