电脉冲激活猪卵母细胞的研究

通过对猪卵母细胞的电激活进行系统研究,结果表明：对于体外成熟卵母细胞,电场强度为 １ ２５０ Ｖ／ｃｍ ,脉冲时程为４０、６０ μｓ时,效果较好,一次脉冲激活率可达８５．３％ 和８７．１％ ;而对于体内成熟卵母细胞,电场强度为１ ５００ Ｖ／ｃｍ ,脉冲时程为４０、６０ μｓ 时,效果较好,一次脉冲激活率达８５．７％ 和８８．２％ ;增加脉冲次数并不能显著提高激活率,反而使卵母细胞裂解率显著增加;激活液选用０．３ ｍ ｏｌ／ Ｌ甘露醇（含０．１ ｍ ｍ ｏｌ／ Ｌ Ｍｇ Ｓ Ｏ４ ）时,添加 ０．１ ｍ ｍ ｏｌ／ Ｌ Ｃａ Ｃｌ２ ,获得较好的激活率（８７．８％ ）电脉冲激活卵母细胞后进一步培养,体内和体外成熟卵母细胞的发育率并无显著差异     

Effects of Density and Thickness of Interlayer on RT Instability of Interfaces

This work focuses on the characteristics of the Rayleigh-Taylor Instability （RTI） of the interfaces formed by two semi-infinitely distributed fluids and one interlayer. In consideration of the coupling effects between the interfaces, the expression of the growth rate is obtained. The result reveals that the instability growth rate depends on the density and thickness of the interlayer. It is found that /f the interlayer thickness is less than 0.6 times of the disturbing wavelength, the coupling effects should be considered.     

利用宇宙线直接测量结果对初级宇宙线能谱参数的调整

由JACEE?,RUNJOB和SOKOL等宇宙线直接测量结果和刚度截断模型,对于10¹⁴—10¹⁶eV能区的初级宇宙线微分能谱参数进行调整.利用调整后的能谱与选取QGSJET模型的CORSIKA程序进行EAS模拟,同HD,PD谱进行对比研究.采用相同的标准对模拟数据与实验数据进行分析.结果表明,调整后的谱和HD谱的模拟结果与甘巴拉山乳胶室实验结果符合较好,而PD谱的模拟结果与实验结果偏离较大.     

关于$\omega$-Smash余积Hopf代数的$(f,\omega)$相容对$(B,,H)$

In this paper we introduce the notion of （f,ω）-compatible pair （B,H）, by which we construct a Hopf algebra in the category HHYD of Yetter-Drinfeld H-modules by twisting the comultiplication of B. We also study the property of ω-smash coproduct Hopf algebras Bω H.     

A New Glucuronidated Metabolite of Andrographolide in Human

A new andrographolide metabolite 1 was isolated from human urine samples after oral administration. The structure was determined to be 3-carbonylandrographolide-19-O-β-D-glucuronide on the basis of chemical evidences and spectral analysis, especially by 2D-NMR techniques.     

Crosslinked Aspartic Acids as Helix‐Nucleating Templates

Described is a facile helix‐nucleating template based on a tethered aspartic acid at the N‐terminus [terminal aspartic acid (TD)]. The nucleating effect of the template is subtly influenced by the substituent at the end of the side‐chain‐end tether as indicated by circular dichroism, nuclear magnetic resonance, and molecular dynamics simulations. Unlike most nucleating strategies, the N‐terminal amine is preserved, thus enabling further modification. Peptidomimetic estrogen receptor modulators (PERMs) constructed using this strategy show improved therapeutic properties. The current strategy can be regarded as a good complement to existing helix‐stabilizing methods.     

Alkaloids from the root barks of Goniothalamus cheliensis

（3S）-2-Oxo-5,12-dimethoxy-3-hydroxy-3-methylbenz[f]indoline （1）, a new benzoxindole alkaloid, along with two known alkaloids, was isolated from the root barks of Goniothalamus cheliensis Hu. The structure was elucidated by spectroscopic evidences, and the absolute configuration was determined by CD spectrum.     

纳米粒子TiO2/Ti膜的表征及其光催化活性

以钛酸四丁酯为原料，采用溶胶－凝胶法，在600℃焙烧制备了纳米粒子TiO2/Ti膜，并利用TG－DTA，XRD、SEM、XPS、PL、SPS和EFISPS测试技术，对膜样品进行了表征。结果表明，纳米粒子TiO2/Ti膜表面为高密度的均匀碎片结构，TiO2纳米粒子具有与国际P-25TiO2粒子相类似的组成、结构以及微晶尺寸；在纳米粒子TiO2/Ti膜的表面，Ti主要以＋4价化学态存在。而O主要以晶格氧、羟基氧和吸附氧3种化学态存在。以纳米粒子TiO2／Ti膜的PL光谱测试中，以260nm为激发波长，观察到了峰位在380nm处的PL光谱，该值与SPS信号的响应阈值是一致的，此PL光谱峰可能与导带低的电子向价带顶的能级跃迁有关，同时说明了TiO2纳米粒子的量子尺寸效应的影响要大于库仑作用能和表面极化能的影响。以310nm为激发波长，分别观察到了与锐钛矿和金红石相关的发光信号；以450nm为激发波长，观察到了与表面态相关的弱的发光信号。此外，在光催化降解苯酚实验中，当涂膜3次时，TiO2粒子膜达到最高的光催化活性。     

Design and preparation of high-aspect-ratio zinc borate whiskers and their effects on mechanical properties of PP nanocomposite

Well-dispersed, high-aspect-ratio 4ZnO·B₂O₃·H₂O whiskers (4ZnO·B₂O₃·H₂O_HARw) were synthesized by a facile hydrothermal method with the aid of ZnSO₄·7H₂O. The formation mechanism was investigated, and the results showed that Zn²⁺ and SO ₄ ^2? ions played a crucial role in the control of 4ZnO·B₂O₃·H₂O_HARw extended along [010] direction. X-ray diffraction (XRD) analysis, high-resolution transmission electron microscopy (HR-TEM), X-ray photoelectron spectroscopy (XPS), and thermogravimetry (TG)-differential scanning calorimetry (DSC) results confirmed that the powder was 4ZnO·B₂O₃·H₂O. Scanning electron microscopy (SEM) and TEM showed that the average aspect ratio of the product was about 100. Nanocomposites of surface-modified 4ZnO·B₂O₃·H₂O_SM-HARw/PP were prepared and their mechanical properties measured. The results suggested that the mechanical properties of 4ZnO·B₂O₃·H₂O_SM-HARw/PP composites were superior to composites made with low-aspect-ratio whiskers (4ZnO·B₂O₃·H₂O_SM-LARw), which displayed poorer mechanical properties even at low addition.     

新型双功能复合电极的制备及其加速水中有机污染物降解作用的研究

介绍了新型复合电极的制备方法、其双功能特性以及在提高水中有机污染物(如苯胺)降解速度所起的作用,并对其作用机制进行了讨论.实验结果表明,由空气电极和TiO₂光催化剂组成的复合电极,当其工作电位控制在0.05V(vs.SCE)左右时,既具有良好的光电效应,又具有以较高效率合成H₂O₂的特性,使溶液中的有机分子获得来自光催化氧化与光化学氧化两方面的联合降解作用,从而显著地提高了有机分子的氧化降解速度.