塔里木盆地12000年来的环境变迁

本文综合分析了地层、考古、树轮等方面的考察资料，认为新疆塔里木盆地在最近１２０００年中，一直是在干旱的荒漠环境控制之下，与现代自然环境的特征基本相似。尽管塔里木盆地干旱多风、水源短缺、植被稀少等环境条件是生存环境恶化的潜在因素，但历史时期发生的河水断流、湖泊变干、沙漠扩张等环境劣变主要是人类活动改变了地表水的地域分配造成的。因此，合理用水、平衡水土是我们今后开发塔里木盆地自然资源应当吸取的历史教训。     

Empirical data decomposition and its applications in image compression

A nonlinear data analysis algorithm, namely empirical data decomposition (EDD) is proposed, which can perform adaptive analysis of observed data. Analysis filter, which is not a linear constant coefficient filter, is automatically determined by observed data, and is able to implement multi-resolution analysis as wavelet transform. The algorithm is suitable for analyzing non-stationary data and can effectively wipe off the relevance of observed data. Then through discussing the applications of EDD in image compression, the paper presents a 2-dimension data decomposition framework and makes some modifications of contexts used by Embedded Block Coding with Optimized Truncation EBCOT . Simulation results show that EDD is more suitable for non-stationary image data compression.     

利用傅里叶变换求解无标度网络的幂指数

复杂网络中无标度网络的显著特点是其度分布呈现幂律尾部,已经有很多学者从不同角度推导证明了大多数无标度网络的度分布函数幂指数大于2,但是最近也发现有一少部分无标度网络的幂指数小于2.现通过利用数学中的傅里叶变换来求解这2类无标度网络的幂指数的值.     

基于Madaline网络敏感性的主动学习算法研究

提出一种基于Madaline网络敏感性的主动学习算法。首先用部分样本训练Madaline网络,然后以Madaline网络输出对其输入在给定样本点附近变化的敏感性为尺度,主动从未参与训练的样本中挑选敏感性相对大的样本继续进行训练,循环反复这个过程直到满足训练要求为止。实验验证了该主动学习算法处理离散分类问题的有效性和可行性。     

地方本科院校食品安全专业应用型课程的构建

在介绍了应用性课程体系特点的基础上,结合绥化学院实际,针对食品安全专业的培养目标,构建应用性课程体系,以期通过应用性课程的构建为地方培养食品安全领域的应用型、复合型人才。     

水稻叶色突变研究进展

水稻叶色突变体表型变异明显,易于观察、利用和鉴别。叶色相关基因在水稻叶绿体形成与发育、叶绿素代谢等过程中,具有极其重要的作用。目前,在水稻所有的染色体中都发现了控制叶色相关的基因。文章从叶绿素合成、降解、水稻叶色突变表型以及叶色变化的分子机制等方面阐述了水稻叶色突变形成的机制。     

抗松材线虫病赤松组培苗的生根与移栽研究

以抗病性较好但不易生根的抗松材线虫病赤松无性系为试验材料,对影响组培苗生根移栽的因素进行了研究。结果表明：将待生根的丛生芽置于17 ℃条件下处理5 d后,不定根诱导率最高达93 %;在生根培养基中添加3050 mg/L香蕉汁有利于不定根诱导;对移栽基质进行高温灭菌或0.2 %高锰酸钾消毒2次的处理均可有效提高组培苗移栽成活率;喷施营养液对组培苗的长势具有促进作用。     

刚竹秆褐腐病病原形态及分子鉴定

刚竹秆褐腐病在南京地区发生较普遍,影响竹林生长。其主要危害刚竹属的淡竹(Phyllostachys glauca)、黄槽刚竹(Ph. viridis f. houzeauana),其中以淡竹受害最为严重。笔者通过对刚竹秆褐腐病病组织分离培养、人工接种试验、分离菌形态学观察及采用通用引物ITS1/ITS4扩增,对扩增出的约559 bp的片段进行ITS序列分子鉴定,最终将在淡竹和黄槽刚竹等上发生的病原鉴定为木贼镰刀菌(Fusarium equiseti (Corda) Sacc.)。     

Probing cellular protein complexes using single-molecule pull-down

Proteins perform most cellular functions in macromolecular complexes. The same protein often participates in different complexes to exhibit diverse functionality. Current ensemble approaches of identifying cellular protein interactions cannot reveal physiological permutations of these interactions. Here we describe a single-molecule pull-down (SiMPull) assay that combines the principles of a conventional pull-down assay with single-molecule fluorescence microscopy and enables direct visualization of individual cellular protein complexes. SiMPull can reveal how many proteins and of which kinds are present in the in vivo complex, as we show using protein kinase A. We then demonstrate a wide applicability to various signalling proteins found in the cytosol, membrane and cellular organelles, and to endogenous protein complexes from animal tissue extracts. The pulled-down proteins are functional and are used, without further processing, for single-molecule biochemical studies. SiMPull should provide a rapid, sensitive and robust platform for analysing protein assemblies in biological pathways.