高校基层学院功能性学生社团标准化建设研究

高校基层学院依据本学院学生工作特色和学生实际情况,在学院范围内建设直属辅导员管理的各类功能性学生社团,有利于提高学生自我管理、自我教育的能力.在实践基础上,提出一套功能性学生社团建设的标准化方案,以提升高校学生事务管理工作科学化水平.     

长白山红松针阔混交林种内、种间竞争关系研究

根据野外调查数据,运用Hegyi单木竞争指数模型,定量分析了长白山红松针阔混交林中红松的种内、种间竞争关系.结果表明:长白山红松针阔混交林内,红松的平均种内竞争强度为0.269 9,竞争强度随着红松林木径级的增大而减小.总体来说,红松的种内竞争强度高于种间竞争.     

草地植物功能性状变异的程度和来源

分析了内蒙古草地植物的6个功能性状在种间、种内不同种群间和同一种群内不同个体间的变异.结果表明,除株高外其余5个功能性状的变异主要来自种间,但种内变异占总体变异的比例不能被忽视.不同功能性状的种内和种间变异的程度和来源不同,说明不同物种、不同性状对环境变化的响应不同.因此利用功能性状进行各种研究时,应该充分考虑种内变异的影响.     

体育行政与体育社团良性互动实现机制的探索——以江苏省体育社团改革发展为例

运用文献资料法、专家访谈法和实证分析等方法,阐述了体育社团的发展现状,对江苏省体育社团在社会化实体化改革过程中取得的成果进行认真探讨和总结,发现存在的问题和不足,努力探索体育社团与体育行政之间有效衔接和良性互动得以实现的长效机制,为促进体育社团科学发展,为全国体育社团的改革和发展提供有益的理论支持和实践路径。     

桉属种间杂种生长和抗青枯病的联合选择

为了培育速生、抗病的桉树杂种,通过苗期病原菌接种和大田试验,对以尾叶桉作母本、细叶桉等8个树种作父本的81个桉树种间杂种进行了生长和抗青枯病的联合选择研究.结果表明:尾叶桉与不同父本树种间杂种的存活率介于44.4%(尾叶桉×柳桉)～74.3%(尾叶桉×赤桉);树高、胸径和材积3个生长性状在父本树种间差异不显著,父本树种内杂种间差异达0.05或0.01显著水平;抗病指数在父本树种间和父本树种内杂种间差异均达0.01显著水平;经选择,评选出13个速生、抗病的桉树种间杂种,平均材积为对照(母本尾叶桉的自由授粉家系)的101.58%～212.65%,平均抗病指数为对照的123.08%～184.60%.     

Management of Associations in the IRBAC 2000 Model

0 IntroductionThe secure interaction between two or more administra-tive domainsis a major concern.There are many differ-ent schemes to resolve the problem, such as DRBAC[1],RT[2],SPKI[3],and KeyNote[4]. Kapadiaet al[5]proposedthe IRBAC (Interoperable Role-Based Access Control) 2000model ,whichcanaccomplishthe secureinteraction by dynam-ic role translations between administrative domains that utilizethe RBAC(role-based access control) model[6]. An adminis-trative domainis defined as…     

闽北米槠天然次生林乔木层群落竞争关系分析

在顺昌县典型米槠天然次生林林分中进行树种调查,在计算群落乔木层优势树种重要值的基础上,运用V-Hegyi竞争指数分析米槠天然次生林群落优势种群竞争关系,从而为闽北米槠天然林的更新与保护提供理论参考.结果表明:在米槠天然次生林中,米槠占据优势主导地位.群落中主要树种米槠、木荷、榉木表现出强烈的种内与种间竞争关系,而其他如拟赤杨、青冈栎、槠木、红楠、黄瑞木、黄楠等次要树种的种内与种间竞争关系均较微弱.     

Modification of supramolecular assemblies based on C4H7(CH3)Te heterocycle and cooperative participation of intermolecular I···I, Te···I, Te···O secondary bonds; C(sp3)–H···O and C(sp2)–H···O hydrogen bonds

2-Methyl-1,1-dicarboxylato-1-telluracyclopentanes C₄H₇(CH₃)Te(OCOR)₂ (R=OCO, C₆H₅, 4-NO₂C₆H₄, 3,5-(NO₂)₂C₆H₃, C₆H₅CH=CH, 4-OCH₃C₆H₄) (2–7) were synthesised from the reactions of 2-methyl-1,1-diiodo-1-telluracyclopentane (1) and corresponding silver salts and characterised by (IR &¹HNMR) spectroscopy. The structures of C₄H₇(CH₃)TeI₂ (1), C₄H₇(CH₃)Te(OCOC₆H₅)₂ (3) and C₄H₇(CH₃)Te(4-NO₂C₆H₄OCO)₂ (4) were established by single crystal X-ray diffraction studies. The structures of 1, 3 & 4 (the immediate environment about tellurium is that of distorted trigonal bipyramidal geometry with a stereochemically active electron lone pair) are described in the context of their ability to generate intermolecular I···I, Te···I, Te···O secondary bonds; C(sp³)–H···O and C(sp²)–H···O hydrogen bonds leading to the formation of polymeric, tetrameric and trimeric supramolecular assemblies. The modification of supramolecular assembly present in the precursor 1 is demonstrated and the cooperative participation of C(sp²)–H···O & C(sp³)–H···O hydrogen bonds, probably, helpful in strengthening the supramolecular assembly is discussed.

Testes and chromosomes in interspecific hybrids betweenHelicoverpa armigera (Hübner) andHelicoverpa assulta (Guenée)

The interspecific hybridization betweenHelicoverpa armigera females andHelicoverpa assulta males yieldedF ₁ hybrids (RS), fertile males and sterile individuals with abnormal genitals. The reverse hybridization betweenH. assulta females andH. armigera males yielded F₁ hybrids (SR)-fertile males and fertile females. The morphology of testes and the karyotype of chromosomes of larvae in the hybrids were investigated. Among the 2d old fifth-instar SR larvae, individuals without testes were fertile females and those with testes were fertile males. The length and breadth of testes between SR and parental species were not significantly different (p>0.05). Among the 2d old fifth-instar RS larvae, the testes were observed in all the individuals, but it could be classified into two types. The length and the breadth of testes in Type 1 larvae were not significantly different from those of their parental species (p>0.05), while those in Type 2 were significantly less than those of their parental species (p<0.01). Mitotic metaphase I of brain cells showed the diploid chromosomes number of both reciprocal hybrids was 2n=62, as many as their parents. The haploid number of 31 was confirmed by counts from spermatocytes at meiotic metaphase from SR male larvae and Type 1 larvae of RS. Meiosis was not observed in spermatocytes of Type 2 larvae of RS. Considering the characteristics of adult hybrids of RS, it was concluded that Type 1 individuals in RS were fertile and those of Type 2 were sterile. The sterility of Type 2 individuals in RS is attributed to the abnormity in development of testes and the failing meiosis of spermatocytes. As a result, the normal spermatozoon could not been produced.     

两种柑橘盾蚧种间竞争可能性探讨

从生态位理论上探讨了两种盾蚧生态位重叠与种间竟争的关系:两种盾蚧的现实生态位重叠时,并不伴随着种间竟争的出现.