一种新型纺锤状α-Fe_2O_3纳米晶的合成、表征及其表面性能(英文)

合成了一种新型的具有单晶结构的α-Fe2O3纳米晶(NFO-1).在我们的合成方法中,样品的形貌和结构在低反应浓度体系中运用无机盐和有机模板进行双重调控,同时用溶剂挥发诱导自组装(EISA)来加速反应和在不改变形貌结构的前提下获得高产率样品.所得α-Fe2O3纳米晶的形貌和结构对其表面修饰功能有明显的影响,NFO-1因其特殊的纺锤状形貌而与表面功能试剂(多巴胺)之间的化学作用有明显的增强.并且,本文所描述的合成方法同样适用于其他过渡金属氧化物纳米单晶的合成.我们预期,这种方法可为新型纳米材料的合成提供新的途径.     

暗能量:观测证据和理论研究

自1998年发现宇宙的加速膨胀以来,大量的天文观测显示宇宙中存在压强为负的暗能量成分.暗能量已经成为目前宇宙学和理论物理的最重要的研究课题之一.文章介绍了暗能量存在的天文观测证据和理论研究现状与展望.     

Linearity relationship between solvatochromic shifts of stilbazolium-like dyes and modified reaction field function

We analyzed statistically the linear correlation of the solva-tochromic shifts of the stilbazolium-like dyes in the nonselected solvents with the reaction field function, L(εr) - bL( n2), and the solvent polarity parameter, ETN, respectively, and observed that there were not perfectly linearity relationships between them, so we introduced ETN into L(εr) - bL(n2) to form a new reaction field function, L(εr) - bL(n2) g ETN, called as the modified reaction field function, which can be perfectly linearly correlated with the solvatochromic shifts of the stilbazolium-like dyes in the nonselected solvents.     

成分和过渡金属对FeZr基非晶态合金晶化温度的影响

本文系统研究了Fe_100-xZr_x,(Fe_1-xZr_x)₈₄B₁₆和Fe_90-xM_xZr₁₀(M=V,Cr,Mn,Co,Ni,Si,B)非晶态合金的晶化温度与成分的关系。主要结果有:用Zr替代Fe使晶化温度明显提高;在FeMZr非晶态合金系列中,晶化温度依M=Mn,Cr,V元素的顺序和M含量x的增大而提高,而依 关键词：     

Cyclin A-Cdk2 Phosphorylates BH3 only Protein Bad in vitro and in vivo

Increasing evidence suggests that Cyclin A-Cdk2 activity is required in the apoptosis process induced by various stimuli. To determine a specific substrate of Cyclin A-Cdk2 for apoptosis, in this study, we carried out anin vitro kinase assay using immunoprecipitated complex Cyclin A-Cdk2 as an enzyme source, and recombinant protein GST-Bad as a substrate. Our study showed that Bad was clearly phosphorylated by Cyclin A-Cdk2 in vitro. To examine whether protein Bad can also be phosphorylated by Cyclin A-Cdk2 kinase in vivo, we transiently overexpressed protein Bad with Cyclin A or Cdk2-dn, a dominant negative version of Cdk2, in Hela cells and determined the phosphorylation status of protein Bad. The test showed that protein Bad was clearly phosphorylated in Cyclin A overexpressed cells,but not in Cdk2-dn or mock transfectent. Moreover, etoposide also caused the phosphorylation of endogenetic Bad. In conclusion, here we provide first time evidence that protein Bad can be a substrate of Cyclin A-Cdk2 apoptosis for in vitro and in vivo.     

区间值直觉模糊超子群

在K.Atanassov引进区间值直觉模糊集的基础上,给出了区间值直觉模糊超子群的定义,刻画了其特征结构,研究了这类区间值直觉模糊超群的同态像及原像等问题.同时,讨论了区间值直觉模糊超子群与区间值直觉模糊子群的关系.     

Rugate光学薄膜通带内反射次峰的抑制

本文探讨了抑制Rugate光学薄膜通带内反射次峰的各种方法。以五次函数匹配和正弦调制相结合的方法获得了在宽光谱范围内能很好抑制反射次峰并能保持其截止带反射率的Rugate膜系。     

Dipole-Dipole Interaction and the Directional Motion of Brownian Motors

The electric field of the microtubule is calculated according to its dipole distribution. The conformationalchange of a molecular motor is described by the rotation ofa dipole which interacts with the microtubulc. The mricalsimulation for the particle current shows that this interaction helps to produce a directional motion along the microtubule.And tte average displacement executes step changes that resemble the experimental result for kinesin motors.