Genome sequence and analysis of the tuber crop potato

Potato (Solanum tuberosum L.) is the world's most important non-grain food crop and is central to global food security. It is clonally propagated, highly heterozygous, autotetraploid, and suffers acute inbreeding depression. Here we use a homozygous doubled-monoploid potato clone to sequence and assemble 86% of the 844-megabase genome. We predict 39,031 protein-coding genes and present evidence for at least two genome duplication events indicative of a palaeopolyploid origin. As the first genome sequence of an asterid, the potato genome reveals 2,642 genes specific to this large angiosperm clade. We also sequenced a heterozygous diploid clone and show that gene presence/absence variants and other potentially deleterious mutations occur frequently and are a likely cause of inbreeding depression. Gene family expansion, tissue-specific expression and recruitment of genes to new pathways contributed to the evolution of tuber development. The potato genome sequence provides a platform for genetic improvement of this vital crop.     

长江水质评价和预测的模型研究

本文研究长江水质的评价与预测的模型。对长江近两年水质总体情况和地区分布进行了定性和定量分析。根据近10年(水文年)的主要统计数据进行分析,给出了I—V类、劣V类水无量纲百分比发展趋势和污水排放量发展趋势的超越函数混合模型和趋势图,由此预测未来长江水污染的情势。最后对解决长江水质污染问题提出了几点建议。     

冷链运输装备开门渗风试验及温度场分析

冷藏运输与配送过程中开、关门进行装卸作业易造成货物温度波动,从而影响食品质量,亟待规范.研究对30℃/-18℃条件下冷链配送过程中存在问题进行分析,对装卸时间、是否安装门帘、装卸时是否开启循环风机等状况进行对比试验.在此基础上有针对性地提出完善及规范化的操作方案.认为开门时间长短是影响运输装备内部温度最重要的因素之一,在装卸作业时对大门开启处进行适当的保护则能大大降低冷量的损失,此外,装卸作业时车内循环风机以关闭为宜.     

构建农村经济安全体系的思考

近年来农村经济的发展出现了减缓趋势,农村面临的经济安全问题,必须引起我们高度重视。全面建设小康社会重点在农村,关键是发展农村经济。为了保证农村经济安全、健康、持续的发展,必须构建农村经济安全保障体系。     

论和谐社会构建中体育之促进作用

采用文献资料、逻辑推理、理论等方法,分析了和谐社会的构建拓宽了体育的功能范围,并对体育在和谐社会构建中的作用进行了论述,旨在更新观念,树立“和谐”意识。