中国科协所属学会、协会和研究会的组织力：概念内涵与构成要素

 对学会、协会和研究会组织力概念和内涵进行了界定，提出了学会、协会和研究会组织力的构成要素，并采用循证研究方法，以中国药学会等参与应对新冠疫情的6个学会为分析对象，收集证据验证了组织力构成要素的合理性。研究结果表明，学会、协会和研究会的组织力由知识引导、价值实现等内向作用要素，创新发展、服务动员等外向作用要素，以及具有双重性质的执行监督、领导规范、凝聚协作和资源配置等要素构成。     

基于线粒体COI基因对5种切梢小蠹种间关系的研究

切梢小蠹属各种之前形态差异很小,种类鉴定困难.采用线粒体DNA细胞色素c氧化酶亚单位I(COI基因)部分序列,对5种切梢小蠹进行PCR扩增和测序.研究分析发现:华山松切梢小蠹与其他4种切梢小蠹存在明显的遗传分化,再次证明华山松切梢小蠹是1个新种;云南切梢小蠹与华山松切梢小蠹在各种分析数据结果都显示出很小的差异,但二者的寄主完全不同,这暗示着二者最初可能起源于同1个祖先,产生分化的原因可能是寄主的差异所致.通过探索5种切梢小蠹之间的关系,为其防控提供科学数据.     

基于Leslie矩阵模型对二斑叶螨与山楂叶螨种间竞争研究

对山楂叶螨与二斑叶螨种群数量动态及内禀增长力进行了室内试验,结果表明,山楂叶螨单种种群在试验环境条件下具有更好的存活率、平均生育力、发育速率,二斑叶螨再此环境条件下,不能维持种群的延续;山楂叶螨混合种群的内禀增长力大于二斑叶螨,山楂叶螨在竞争中生殖繁衍取得优势,具有更强的竞争能力.Leslie种群增长矩阵模型预测结果表明,Leslie矩阵模型对山楂叶螨单种种群和混合种群的预测结果拟和优度均较高,可以短期内预测其种群数量,而Leslie种群增长矩阵模型仅对二斑叶螨混合种群的预测结果精度很高,可以用作短期预测.     

论高校学生社团在思想政治教育工作中的意义

高校社团的蓬勃发展,开辟了大学生思想政治教育载体的新领域.实现学生社团建设与高校思想政治教育的有机融合,是提高大学生思想政治教育实效性的内在要求和必然选择.本文分析了学生社团建设与高校思想政治教育结合的可能性及意义,提出了新时期加强学生社团建设,提高高校思想政治教育实效性应采取的具体措施.     

部分李属植物种间杂交不亲和性的研究

通过常规杂交及荧光显微镜观测等方法,对李、杏种间杂交不亲和性进行了研究.研究结果表明,铃铛花期授粉的坐果率显著高于初花期授粉的坐果率;同一杂交组合,正反交坐果率差异显著;母本对远缘杂交亲和性影响很大,父本对远缘杂交亲和性的影响较小;通过具备正常活力及萌芽率的花粉授粉后,李杏杂交存在一定程度的花粉和柱头不亲和及＂拒绝＂反应,以李为母本的杂交不亲和性部位在柱头表面和花柱上部,而以杏为母本的不亲和部位则在花柱中下部.研究结果可为阐释李、杏种间杂交不亲和机制提供理论依据.     

Spiking threshold and overarousal effects in serial learning

Possible dependencies of serial learning data on physiological parameters such as spiking thresholds, arousal level, and decay rate of potentials are considered in a rigorous learning model. Influence of these parameters on the invertedU in learning, skewing of the bowed curve, primacy vs. recency, associational span, distribution of remote associations, and growth of associations is studied. A smooth variation of parameters leads from phenomena characteristic of normal subjects to abnormal phenomena, which can be interpreted in terms of increased response interference and consequent poor paying attention in the presence of overarousal. The study involves a type of biological many-body problem including dynamical time-reversals due to macroscopically nonlocal interactions.Supported in part by the A. P. Sloan Foundation (71609), the NSF (GP-13778), and the ONR (N00014-67-A-0204-00-0051).Supported in part by the ONR 4102 (02).     

Expression of LIF,VEGF, CD57 and CD68 after the transfer of rat embryos to mouse uteri

The high failure rate of interspecific preganacy is a major obstacle to the successful interspectific cloning of mammals,To in vestigate the reasons for the failure of inter-specfic pregnancy between rats and mice,we transferred rat blastocysts into mouse uteri on the third day of pseudopreg -nancy (D3),oure previous study showed that intact rat embryos could still be observed in mouse uteri on D9.In the present study ,we found that expression of CD57 and CD68 increased significantly at the maternal -fetal interface fol-lowing the transfer of rat embryos,Similarly ,Leukaemia inhibitory factor(LIF) expression increased ,but vascular endothelial growth factor(VEGF) expession decreased,In a co-culture system ,the percentage of rat ectoplacental cones (EPCs) with adhesion and outgrowth and outgrowth area on mouse uterine decidual cells were less than that of mouse EPCs,These results indicate that an increase in the immunological rejection response and a decrease in the in vasiveness of rat embryos may be important reasons for the failure of interspecific pregnancy between rat and mouse.     

社会中介组织的兴起与依法治国--一个价值维度的考察

二十世纪以来在社会生活领域涌现出了大量的介于政府与社会个体成员之间的社会中介组织,不仅对社会生活产生了重大的影响,同时也有力地推动了法治进程的现代化。在结社自由制度保障之下大量涌现的社会中介组织,是支撑法治运行的社会基础,形成了有效制约国家权力的社会公共力量,改变了弱势群体的力量对比关系,为实现社会实质正义、促进人权保障提供了现实有效的途径。     

Evaluation of the introgressed lines and screening for elite germplasm in Gossypium

THERE ARE 51 SPECIES IN THE GENUS OF GOSSYPIUM[1]. EXCEPT UPLAND COTTON CULTIVARS, WILD CULTIVARS, SPECIES AND RACE HAVE ABUNDANT GENETIC POLYMORPHISMS DUE TO THEIR VARIOUS ENVIRONMENTAL DISTRIBUTION AND LONG-TERM NATURAL SELECTION. THEREFORE, THEY POSSESS LOTS OF EXCEL- LENT GENES THAT CAN BE USED TO EXPLOIT POTENTIAL TRAITS, SUCH AS DROUGHT RESISTANCE, DISEASE AND INSECT …