手足口病型传染病的数学模型

将传染病流行区内的人群分成5类,根据人群之间的变化机制,应用动力学方法建立了含有潜伏期且在潜伏期、发病期和病愈期内均具有传染性的手足口病型传染病的数学模型.并在建立模型的基础上,讨论了手足口病模型的平衡点和稳定性,同时得出了阈值定理.     

小鼠精子微注射受精卵的体外发育与移植的研究

用显微注射方法,将精子注入小鼠卵母细胞卵周隙中,使精卵体外受精获得受精卵。并对精子注射后卵母细胞的成活率、受精率和受精卵的发育率以及移植后受胎率等方面进行了系统的研究,结果表明:卵子存活率为75.36％(1309/1737),其中264枚卵裂,受精率为20·17％(264/1309),卵裂卵经体外培养后有192枚发育到桑椹胚及胚泡期,发育率为72.73％(192/264)。将其中73枚(桑椹胚10枚,肛泡63枚)胚胎移植到10只假孕受体子宫中,一只受体妊娠产仔9只,仔鼠发育正常。     

低碳微量铌钢过冷奥氏体形变过程中的碳氮化物析出

利用透射电镜研究了低碳微量铌钢过冷奥氏体形变过程中的碳氮化物析出,运用Gladman晶粒粗化机制讨论了析出相颗粒的平均直径、体积分数和铁素体晶粒尺寸的关系.实验结果表明:实验用钢中的微量Nb在1 200℃时完全固溶,并在760℃变形前的冷却过程中无Nb(CN)析出.在形变过程中Nb(CN)的析出同样需要孕育期,但与等温过程相比大大提前.当变形量积累到一定值(本实验条件下ε=0.69)时,大量动态析出的Nb(CN)颗粒弥散分布在晶界以及位错线上.Nb(CN)析出随着应变量的增加而增加,但颗粒长大不明显,计算得到的铁素体晶粒平均截径与实际测得的铁素体晶粒吻合得较好.     

软畴段在面内磁场作用下的行为

实验研究发现Ｈｉｐ对软畴段的条泡转变场Ｈｓｂ和磁泡缩灭场ＨＯ有较大影响，而且Ｈｓｂ和ＨＯ随Ｈｉｐ的变化与样品晶向有关     

Biological effects of trilostane in vitro on oocyte maturation and fertilization in the hamster

Summary The effects of the inhibition of steroidogenesis by trilostane on oocyte maturation were examined by studying spontaneous maturation and fertilization in vitro. 10^–6 M trilostane had no influence on the meiotic process, whether the oocytes were naked or not. At a concentration of 10^–6 M and 10^–7 M trilostane, low normal pronuclear formation and high polyspermy were found during in vitro fertilization. However, no retarded male pronuclear development could be detected in the trilostane-treated group. Thus, steroid producing activity within ova is apparently necessary to prevent multiple sperm penetration, but it has no effect on meiosis or the action of the so-called male pronucleus growth factor (MPGF).     

Comparison of the time courses of luteinizing hormone (LH) secretion rates during continuous stimulation by LH-releasing hormone (LH-RH) in vivo and in vitro

Summary The patterns of LH secretion during constant stimulation of the pituitary glands of estradiol-treated ovariectomized rats with a maximally stimulating amount of LH-RH in vivo and in vitro correspond with each other qualitatively and quantitatively. In vitro the changes with time of the LH secretion rate are somewhat retarded, especially the occurrence of desensitization.     

In vitro systems in the study of peroxisomal protein import

Our level of understanding of peroxisome biogenesis in comparison with other cellular organelles is rudimentary, yet the fragments of information available indicate that the targeting and import of peroxisomal proteins occur by fundamentally different mechanisms. Genetic studies have identified a number of genes required for peroxisome assembly, but in most cases the functions of the gene products remain unknown. In vitro protein translocation systems have played a prominent role in unravelling the biochemistry of protein translocation into other organelles. This review considers some of the requirements for establishing a bona fide peroxisomal import assay and discusses the findings which have emerged as a result of using such experimental systems.     

工科大学生创业基本素质和能力教育的途径与形式

近年来,创业教育在世界各国高校已得到普遍重视,联合国教科文组织在其文件中也明确指出：“培养大学生创业技能与主动精神应成为高等教育主要关心的问题,大学生愈来愈不仅仅是求职者,而首先将成为工作岗位的创造者。”培养工科大学生的创业基本素质和能力是工科教育工作者的重要课题。“工科大学生创业教育模式的研究”课题组围绕工科的大学生更应该具备基本的创业素质和能力进行了调查研究,探索了培养工科大学生创业素质和能力的主要途径。     

从未改变的灵魂——《在人间》中作者的心灵体现

高尔基在其自传体三部曲中记录了他充满磨难的成长经历,也展现了一个革命者淳朴而坚韧的灵魂。《在人间》中阿廖沙的爱心、抗争、探索、选择及建设性的人生态度,体现着作者宽广的精神世界,这对身处现代和后现代文化语境中生存的人们具有十分重要的精神价值。     

Ba4In2O7纳米棒薄膜的制备与光催化性能

采用溶胶凝胶法在石英基体上制备Ba4（In0.95Cr0.05）2O7薄膜。通过X射线衍射，扫描电镜，紫外漫反射光谱，光照下水溶液中甲基橙降解实验表征材料性能。SEM结果表明薄膜由均匀纳米棒组成，紫外漫反射结果表明材料吸收边为450nm，具有较宽的光谱响应范围。光催化实验表明材料在2h内甲基橙降解率达到76％。由于该材料易于回收再利用，可重复使用，并且其光催化效率可通过材料和光催化反应体系的不断改性来继续提高，因而在光催化方面具有较理想的研究及应用前景。