致孔剂对HP（MA—VAc—MMA）载体孔结构的影响

以二乙烯苯和双丙烯酸多缩乙二醇酯为交联剂、聚醋酸乙烯酯（ＰＶＡｃ）或它与醋酸丁酯（ＢＡＣ）的混合物为致孔剂、ＢＰＯ为引发剂，用悬浮聚合随后水解的方法制得了部分水解聚（丙烯酸甲酯－醋酸乙烯酯－甲基丙烯酸甲酯）［ＨＰ（ＭＡ－ＶＡｃ－ＭＭＡ）］多孔载体，研究了ＰＶＡｃ及（ＰＶＡｃ＋ＢＡＣ）用量、分子量及混合比对ＨＰ（ＭＡ－ＶＡｃ－ＭＭＡ）孔结构的影响。结果表明，当ＰＶＡｃ的Ｍ＞２．５×１０５，ＰＶＡｃ／ＢＡＣ为２．３，用量为１０～２０％时，可制得孔隙率较高，孔径分布较窄，孔表面积较大的多孔载体。这种载体适用于微生物固定化。     

Using Carrier Fringes to Study the High Temperature Deformation Behavior of a BGA Package Under Extended Dwell Times

There is a compelling need to experimentally understand solder joint deformation behavior at high temperatures over an extended period of time. Accordingly, the deformation behavior of solder joints in a Ceramic Ball Grid Array (CBGA) package mounted on an organic FR4 board under extended dwell time at a high temperature has been studied using laser moiré interferometry. The warpage and the in-plane horizontal deformation of the ceramic substrate and the organic board as a function of time were determined. The variation of the normal strains and shear strains in the solder joints with time were also investigated. It was found that increased sensitivity was necessary to accurately determine the strains in the small sized solder joints. A new method utilizing carrier fringes to increase the sensitivity of the moiré interferometry system is proposed and has been used to determine the strains in the small sized solder joints. Increased sensitivity can be obtained merely by changing the incident angle of the laser light on the surface of the specimen, thereby making it unnecessary to use expensive phase shifting apparatus with the traditional laser moiré system.     

Beiträge zur Chemie der Pyrrolpigmente, 80. Mitt. Synthese,Struktur und Transporteigenschaften von Hexapyrrinanaloga

Summary A 15-thia- and a 15-nor hexapyrrin derivative were prepared. Their structural features were analyzed by¹H-NMR and absorption spectroscopy. All-(Z) configurations and all-syn conformations were found throughout. Carrier mediated transport efficiencies of these compounds in bulk membranes were studied and compared with those of a recently synthesized pentapyrrin-dione and their tripyrrinone partial structure. The pentapyrrin-dione derivative turned out to be one of the most efficient Hg(II) carriers known so far.

     

Viscosity of gases used as the mobile phase in gas chromatography

The vicosity-temperature relationship of the three gases (helium, nitrogen and hydrogen) most frequenly used as the carrier gas in gas chromatography is studied. Based on available data, equaitions are derived to describe this relationship. Using these equations viscosity data are tabulated for the chromatographically important temperature range.Dedicated to Professor A. Zlatkis on the occasion of his 60th birthday.     

Beiträge zur Chemie der Pyrrolpigmente, 47. Mitt.

Carrier mediated transport of bilirubin, biliverdin, their dimethylesters and aetiobiliverdin-IV- is measured using a variety of potential carriers like proteins, peptides, tensides and -cyclodextrin in a bulk membrane model. A strong dependence of the transport flux densities on structural details of the carriers as well as of the bile pigments themselves is observed.

     

Carrier dynamics in CsPbI3 perovskite microcrystals synthesized in solution phase

Carrier diffusion and recombination kinetics in all-inorganic CsPbI₃ perovskite microcrystals directly synthesized in solution phase are reported.     

基于透明质酸的刺激响应纳米给药系统的研究进展

透明质酸(Hyaluronic acid, HA)是一种天然多糖,具有良好的生物相容性和生物降解性,利用 HA 构建的纳米载体自身就具有肿瘤靶向功能,可以作为抗癌药物载体将药物传递到肿瘤细胞内从而实现精准到达病患处。近年来透明质酸在应用于肿瘤靶向给药系统中的关注越来越多,成为了靶向治疗肿瘤的一大研究热点。基于透明质酸的基本特性和肿瘤靶向的生理学基础,在不同的刺激响应下,透明质酸型纳米给药系统能将药物集中释放于肿瘤的微环境内,更好地杀死肿瘤细胞,同时避免其他正常的组织受到药物损害。本文主要综述了透明质酸型纳米药物输送系统在各种刺激响应下释放药物的最新研究进展。     

Tin(II)-Based Metal–Organic Frameworks Enabling Efficient,Selective Reduction of CO2 to Formate under Visible Light

Certain metal complexes are known as high-performance CO₂ reduction photocatalysts driven by visible light. However, most of them rely on rare, precious metals as principal components, and integrating the functions of light absorption and catalysis into a single molecular unit based on abundant metals remains a challenge. Metal-organic frameworks (MOFs), which can be regarded as intermediate compounds between molecules and inorganic solids, are potential platforms for the construction of a simple photocatalytic system composed only of Earth-abundant nontoxic elements. In this work, we report that a tin-based MOF enables the conversion of CO₂ into formic acid with a record high apparent quantum yield (9.8 % at 400 nm) and >99 % selectivity without the need for any additional photosensitizer or catalyst. This work highlights a new MOF with strong potential for photocatalytic CO₂ reduction driven by solar energy.     

多肽自组装技术及其在生物医学上的应用

多肽分子自组装广泛存在于自然界中。多肽具有良好的生物相容性和可调控的降解性能,并且利用多肽自组装技术,可以在分子水平上设计并调控聚集态的形状和结构,这在生物医学材料方面具有巨大的应用潜力。近年来关于多肽自组装的研究成为材料学、医学等领域中研究热点之一,并且在药物缓释载体、组织工程支架研究方面取得进展。本文介绍多肽分子自组装技术的概念,综述了多肽自组装技术在药物缓释载体材料、组织工程支架材料方面的应用。