A QTL for rice grain width and weight encodes a previously unknown RING-type E3 ubiquitin ligase

Grain weight is one of the most important components of grain yield and is controlled by quantitative trait loci (QTLs) derived from natural variations in crops. However, the molecular roles of QTLs in the regulation of grain weight have not been fully elucidated. Here, we report the cloning and characterization of GW2, a new QTL that controls rice grain width and weight. Our data show that GW2 encodes a previously unknown RING-type protein with E3 ubiquitin ligase activity, which is known to function in the degradation by the ubiquitin-proteasome pathway. Loss of GW2 function increased cell numbers, resulting in a larger (wider) spikelet hull, and it accelerated the grain milk filling rate, resulting in enhanced grain width, weight and yield. Our results suggest that GW2 negatively regulates cell division by targeting its substrate(s) to proteasomes for regulated proteolysis. The functional characterization of GW2 provides insight into the mechanism of seed development and is a potential tool for improving grain yield in crops.     

针对苯胺装置制氢单元再生塔底再沸器泄露问题的创新性技术改进

对兰州石化公司7万吨/年苯胺生产装置制氢单元再生塔底再沸器的腐蚀泄露问题进行了技术改进,改造后该设备使用寿命延长,装置运行良好,达到了预期的目的。     

中国金边瑞香研究进展

综述了我国近二十年来金边瑞香主要研究,包括扦插、离体快繁、花期调控等科研现状以及生产应用概况,并对其育种、无土栽培等研究领域进行了展望。     

道路交通安全违法分析领域知识图谱构建方法

为有效处理海量庞杂、动态变化的公安交通管理数据,深度挖掘数据中隐藏的交通安全违法线索,利用知识图谱技术,对公安交通集成指挥平台中汇聚的多源数据进行了梳理整合,基于自顶向下的方法完成了支撑道路交通安全违法分析的知识图谱构建。首先根据交通安全违法分析专业知识和数据资源基础,确定知识图谱模式层结构,其次研究实体、属性、关系抽取及知识存储方法,最后基于构建的道路交通安全违法分析领域知识图谱开展应用探索。研究结果将有助于实现公安交通管理大数据的知识化,提高交通安全违法行为智能研判水平。     

Rapid reductive degradation of azo dyes by a unique structure of amorphous alloys

An Fe-based amorphous alloy was found to significantly enhance the reductive degradation of an azo dye in aqueous solution. The surface-area normalized rate constant was up to 2.0 L m-2 min-1 at room temperature,an order of magnitude larger than any previously reported value. The activation energy of the degradation process was calculated according to the Arrhenius equation,and a much lower value than those previously reported was obtained. Valence band measurement indicated that a depressed valence band maximum and a widened empty band were established in the amorphous ribbon. The unique structure of the amorphous alloy is important-it may reduce the activation energy of the degradation process and enhance the activity of the electrons,thus accelerating the degradation process.     

多媒体网络下的大学英语自主学习

随着网络多媒体技术的发展,教学方式和学习方式的改变,培养大学生的自主学习能力已成为外语教学的根本目标之一。成为外语素质教育的重要体现。     

中国乒乓球运动“海外兵团”问题的理性思考

参阅相关文献资料,述评中国乒乓球运动海外兵团问题的理论研究现状,分别选取历史与近期发生的何智丽事件和唐娜事件所呈现的典型事件,引发对冠军的稀缺性、体制的不完善性、人生价值实现、治理模式、基本生活保障等深层次问题的理性思考;最后,从媒介表达、以人为本、理论建设、体制改革4个方面提出了解决策略.     

活性炭电化学性能与液相吸附性能间的关系

表征了以典型商品活性炭及几种自制掺锰活性炭为原料制备的双电层电容器电极的循环伏安及定电流充放电特性,测定了活性炭对KOH水溶液中钾离子的吸附等温线,并根据拟合的Temkin方程计算了在KOH水溶液(w=30%)中活性炭对钾离子的平衡吸附量,在此基础上关联了活性炭对电解质的平衡吸附量与电化学性能之间的关系。结果表明:活性炭电极的比电容量随其对电解质平衡吸附量的增大而增大,平衡吸附量与比电容量成较好的线性关系,线性相关系数为0.970 5。     

广西高校大学生化学论文设计竞赛的实践与研究

该文立足于项目广西高校大学生化学化工类论文设计竞赛的研究与实践,阐述了竞赛实施的背景、特点以及对大学生创新能力、高校化学教学科研、课程设置方面所起的作用.     

对媒体娱乐化倾向的反思

当前媒体的娱乐化发展愈演愈烈,我们的媒介似乎患上了＂娱乐综合征＂,娱乐有演变成媒体最主要功能的倾向。这种发展倾向带给大众娱乐的同时,也会给我们的社会和个人带来诸多困惑。