ISSR markers based on GA and AG repeats reveal genetic relationship among rice varieties tolerant to drought, flood, or salinity

Drought,flood,salinity,or a combination of these limits rice production.Several rice varieties are well known for their tolerance to specific abiotic stresses.We determined genetic relationship among 12 rice varieties including 9 tolerant to drought,flood,or salinity using inter-simple sequence repeat (ISSR) markers.Based on all markers,the nine tolerant varieties formed one cluster distinct from the cluster of three control varieties.The salt-tolerant varieties were closest to two flood-tolerant varieties,and together they were distinct from the drought-tolerant varieties.(GA)8 YG was the most informative primer,showing the highest polymorphic information content (PIC) and resolving power (Rp).The drought-,flood-,and salt-tolerant varieties grouped in three distinct clusters within the group of tolerant varieties,when (GA)8 YG was used.Sabita was the only exception.The two aus varieties,Nagina22 and FR13A,were separated and grouped with the drought-and flood-tolerant varieties,respectively,but they were together in dendrograms based on other primers.The results show that ISSR markers associated with (GA)8 YG delineated the three groups of stress-tolerant varieties from each other and can be used to identify genes/new alleles associated with the three abiotic stresses in rice germplasm.     

荧光光谱滴定法测定修饰环糊精与金刚烷衍生物的稳定常数

8-羟基喹啉修饰环糊精可发射8-羟基喹啉基团的荧光,环糊精和8-羟基喹啉基团存在自包结现象,当该修饰环糊精加入金刚烷衍生物后,金刚烷衍生物和修饰环糊精形成更稳定的包合物,可以把环糊精自包结的8-羟基喹啉基团顶出环糊精空腔,从而引起饰修环糊精荧光强度的变化。通过测定荧光强度的变化值,测得修饰环糊精与金刚烷衍生物配合物的稳定常数为LogKs=4.015。     

基于RBF神经网络的ZGMn13堆焊焊条的设计

提出了一种基于RBF神经网络的CaO—CaF2-SiO2渣系ZGMn13堆焊焊条配方优化设计方法．利用实验采集的数据对网络进行训练,以加工硬化后的硬度为优化目标,得到最优的焊条配方．实验结果表明：优化后熔敷金属的动载加工硬化性能和静载加工硬化性能良好。     

Molecular design and application of luminescent materials composed of group 13 elements with an aggregation-induced emission property

Complexation of π-conjugated ligands by metal or semimetal ions leads to the enhancement of the planarity and rigidity of π-conjugated systems. Boron, especially, has played a central role in the design of luminescent main-group complexes. However, these complexes still suffer the disadvantage of aggregation-caused quenching as well as typical organic fluorophores. It has recently been reported that some types of boron complexes exhibit the aggregation-induced emission (AIE) property. Moreover, AIE behavior from complexes and organometallic compounds composed of the other group 13 elements, such as aluminum and gallium, has emerged in this decade. These observations greatly encourage us to develop advanced functional materials based on the group 13 elements. Indeed, recent research has demonstrated that these classes of materials are potentially versatile scaffolds for constructing chromic luminophores, efficiently emissive π-conjugated polymers and so on. This review mainly describes AIE-active group 13 complexes with four-coordinate structures and their application as photo-functional materials. Proposed mechanisms of the origins of AIE behavior are briefly discussed.     

Periodic solutions for third order p-Laplacian equation with a deviating argument

By means of Mawhin's continuation theorem, we study a third-order p-Laplacian differential equation

(?_p(u^″(t)))^′+f(t,u^′(t),u^″(t))+g(t,u(t-τ(t)))=e(t).     

Resolving the knowledge paradox: Knowledge-spillover entrepreneurship and economic growth

The knowledge paradox suggests that high levels of investment in new knowledge do not necessarily and automatically generate the anticipated levels of competitiveness of growth. In particular, knowledge investments do not automatically translate into balanced growth and competitiveness. The purpose of this paper is to explain why knowledge investments are inherently unbalanced, so that the competitiveness and growth ensuing from knowledge are not equally spread across individuals, firms, and spatial units of observation, such as regions and countries. Based on a data set linking entrepreneurial activity to growth within the context of German regions, this paper shows that entrepreneurship serves a conduit of knowledge spillovers.     

Heusler合金Ni-Mn-Ga和NaZn13型化合物La（Fe,Co,M）13,M=Si,Al的巨大磁熵变（英）

在Heusler合金Ni Mn Ga和NaZn₁₃型化合物La(Fe,Co,M)₁₃,M =Si,Al中很宽温度区间发现巨大磁熵变△S。这两种材料在室温区的磁熵变△S均显著地超过单质稀土Gd并达到著名的磁热效应材料Gd₅Si₂Ge₂ 合金的磁熵变幅度.Heusler合金Ni Mn Ga中的巨大磁熵变来源于具有一级相变特征的马氏结构相变。NaZn₁₃型化合物La(Fe,Co,M)₁₃,M =Si,Al中异常巨大的磁熵变与合金中的强的磁晶耦合相关,表现为居里温度附近晶格的巨大负膨胀。材料的低价格和其巨大磁熵变表明,Heusler合金Ni Mn Ga和NaZn1 3型化合物La(Fe,Co,M)₁₃,M =Si,Al在很宽的高温区,尤其在室温区作为磁制冷工质非常有吸引力。     

ISBN-13对出版物种类的规定与分析

文章介绍了ISBN-13对出版物种类的规定、分配及其使用规则,分析了相关的出版物要素、出版物种类的变革与识别、图书馆注意事项等问题。     

我国战略高技术发展思路探讨

在对我国战略高技术思路的发展过程进行历史回顾的基础上,认为战略高技术仅是跟进能力较强,我国战 略高技术的潜力要想变成实力仍需解决投入力度仍不够大、积累时间仍不够长,以及高水平的战略高技术人才问题缺 乏和创新文化比较薄弱的三大问题。“十三五”期间我国战略高技术的发展思路要注重四点,即在战略思维上提出领跑 战略、在战略规划上强调长期思维、在具体执行上坚持分类实施、在经费保障上注意抓大放小。     

关于落实科技创新发展的战略思考

面对我国全面建设小康社会的关键时期,提高自主创新能力、建设创新型国家的攻坚阶段,文章在分析科 技创新在推进国家进步和发展中发挥重要作用的基础上,提出建设创新型国家、加快转变经济发展方式、实现科技创 新发展的战略思考：一要加强基础研究和原始创新,二要强化技术转移和科技成果转化,三要加强科学、技术与创新 的协同。