Fabrication of tunable colloid crystals from amine-terminated polyamidoamine dendrimers

A pH-responsive colloidal crystal was assembled using core-shell composite spheres, poly(styrene-methyl methacrylate-acrylic acid) (P(St-MMA-AA)) spheres covered by generation 4 amine-terminated polyamidoamine dendrimers. The light reflection of the colloidal crystal film can be tuned at different pH due to different protonation level of the dendrimers. The method shows a facile way to fabricate diffraction-based chemical and biological sensors by exploiting the effect of photonic crystal cooperated with tunable nanoparticles.     

NBR/ORGANOMODIFIED BENTONITE INTERCALATED HYBRIDS AND THEIR EFFECTS ON THE TOUGHNESS OF PVC

Hybrids of intercalative nitrile-butadiene rubber/organomodified bentonite (NBR/OMB) were prepared by thelatex intercalation technique. Investigation of their mechanical properties and the microstructore of NBR/OMB showed thatthe organomodified bentonite is an effective toughener for NBR. Transmission electronic microscopy (TEM) and X-rnydiffraction (XRD) tests showed that the NBR macromolecule could be intercalated into the galleries of bentonite.Incorporation of NBR/OMB hybrids as tougheners into poly(vinyl chloride) (PVC) results in a substantial increase in theimpact strength of PVC, but little decrease in its tensile strength and flexural strength, compared to the unmodified PVC.     

Simultaneous determination of magnesium lithospermate B, rosmarinic acid, and lithospermic acid in beagle dog serum by liquid chromatography/tandem mass spectrometry

A rapid, sensitive and specific isocratic liquid chromatography/tandem mass spectrometry (LC/MS/MS) method was developed for the simultaneous quantitative determination of magnesium lithospermate B (MLB), rosmarinic acid (RA), and lithospermic acid (LA) in beagle dog serum, with silibinin as internal standard. The serum samples were treated by liquid-liquid extraction and analyzed using LC/MS/MS with a TurboIonSpray source. A short run-time (3 min) fulfilled the need for monitoring serum levels of MLB, RA, and LA in large-scale studies. The calibration curves for MLB, RA, and LA were linear over the ranges 8-2048, 4-1024, and 4-1024 ng/mL, respectively, with coefficients of correlation >0.999. The intra- and inter-day precision (CV) of analysis was <10%, and accuracy ranged from 90-104%. This quantitation method was successfully applied to a pharmacokinetic study of salvianolate administrated by intravenous infusion with dosage of 6 mg/kg in beagle dogs.     

REDUCTION OF C=C DOUBLE BOND WITH BOROHYDRIDE EXCHANGE RESIN-TRANSITION METAL COMPOUND SYSTEMS

Borohydride exchange resin-transition metal(Co,Ni,Cu,)compoundsystems reduced C=C double to C-C single bond in ethanol.     

铁形态分析进展

本文对Fe（Ⅱ）、Fe（Ⅲ）形态分析在1990－2000年间的发展概况作了综述，内容包括分光光度法、色谱法、流动注射分析法等。引用文献53篇。     

The preparation of nano‐scope chitosan‐oligomer copper complexes and their interaction with DNA

Water‐soluble low molecular weight chitosan of nanometer level and its copper complexes were prepared, and characterized by IR spectra, elemental analysis and gel permeation chromatography (GPC). The modes and mechanism of these copper complexes interaction with DNA were studied by a fluorescent probe method and electrophoresis analysis. It is suggested that there are electrostatic and intercalation modes of copper complexes interacting with DNA. At first, the cationic complex electrostaticly binds to the negatively charged phosphate backbone of DNA, and then a portion of the complex intercalates between the base pairs on the DNA duplex strand. Copyright © 2005 John Wiley & Sons, Ltd.     

VA族元素对阳极铅(Ⅱ)氧化物膜半导体性质的影响(Ⅱ)

用光电化学电流法研究了铅、铅砷、铅锑和铅铋合金在4．5mol·L－1H2SO4溶液（22℃）中，以0．9V（vs．Hg／Hg2SO4）极化7h而形成的阳极膜中的氧化铅的半导体性质，合金添加剂砷、锑和铋对t－PbO（四方氧化铝）和o-PbO（斜方氧化铝）的禁带宽度没有影响，从量子效率和电位的关系可求Pb，Pb－lat％As（at％表示原子百分比，全文同），Pb-lat％Sb和Sb－lat％Bi上膜中t－Pbo的施主密度（ND）分别为9．3×1015，1．0×1016，3．1×1016和1．3×1017cm-3，平带位分别为-0．20，－0．22，－0．28和-0．08V（vs．Hg／Hg2SO4）．比较VA元素砷、锑和铋对上述膜中t－Pbo的ND（从而自由电子密度）和膜中t－Pbo的生长速率的影响，可认为法添加剂砷、锑和铋对阳极膜中t-Pbo的作用符合Hauffe规则．     

壳聚糖负载贵金属催化剂的研究进展

壳聚糖负载的贵金属催化剂显示了高催化活性和高选择性，已被用于氧化反应、氢化反应、烯丙基取代反应、羰基化反应、Suzuki和Heck偶联反应、烯烃的不对称二羟基化反应及有机醛、酮的合成反应体系中。本文对其制备方法、可能结构及其在各种反应体系中的催化性能进行了综述。     

碱性二苯基萘基甲烷染料褪色分光光度法测定肝素

肝素(Heparin, Hep)由葡萄糖胺磺酸、葡萄糖醛酸和艾杜糖醛酸组成, 在水溶液中由于其酸性基团的离解而成为带多个负电荷的大阴离子[1].肝素具有广泛的生物学功能, 在人体内由肥大细胞分泌而自然存在于血液中, 在体内外均有延缓或阻止血液凝固的作用. 肝素或其衍生物还可用于调血脂、抗血栓、改善血液流变学指标、抗炎、抗过敏及免疫调节等, 是重要的生化药物之一 [2]. 对不同的疾病, 肝素有不同的最适剂量, 临床上常采用生物方法 [3]来进行监控. 但由于受生物个体的影响较大, 故使其应用受到限制. 此外, 分光光度法 [1,4,5]、荧光法[6]、HPLC法[7]、细管电泳法[8]及电化学传感器[9]已用于肝素的测定, 其中分光光度法由于操作简便、快速、仪器价廉和灵敏度较高等优点而得到重视.