Transferrin recognition based on a protein imprinted material prepared by hierarchical imprinting technique

A novel kind of transferrin imprinted polymer particles was synthesized by a hierarchical strategy. First, transferrin was immobilized on silica beads by non-covalent absorption. Then, a pre-polymerization mixture, composed of 1,4-bis(acryloyl)piperazine, methacrylamide, methacrylic acid, ammonium sulfate and polyoxyethylene sorbitan monolaurate, was irrigated into the pores of silica particles, and polymerized at 25 °C. Finally, the silica matrix was etched with ammonium hydrogen fluoride, not only to remove the template protein, but also to expose protein recognition sites on the surface of the imprinted polymer. The binding capacity of the transferrin-imprinted particles is 6.3 mg of protein per gram of material, and the time required to reach adsorption equilibrium was less than 10 min. The imprinting factor of transferrin is ca. 3.3 in the presence of ribonuclease B, cytochrome c and β-lactoglobulin. The results indicate that these imprinted polymer particles can recognize transferrin with good selectivity, high binding capacity and fast mass transfer. They may be applied as an artificial antibody to remove the high abundance proteins in plasma.

Simultaneous Spray Self‐Assembly of Highly Loaded ZIF‐8–PDMS Nanohybrid Membranes Exhibiting Exceptionally High Biobutanol‐Permselective Pervaporation

The ability to obtain a maximum loading of inorganic nanoparticles while maintaining uniform dispersion in the polymer is the key to the fabrication of mixed‐matrix membranes with high pervaporation performance in bioalcohol recovery from aqueous solution. Herein, we report the simultaneous spray self‐assembly of a zeolitic imidazolate framework (ZIF)–polymer suspension and a cross‐linker/catalyst solution as a method for the fabrication of a well‐dispersed ZIF‐8–PDMS nanohybrid membrane with an extremely high loading. The ZIF‐8–PDMS membrane showed excellent biobutanol‐permselective pervaporation performance. When the ZIF‐8 loading was increased to 40 wt %, the total flux and separation factor could reach 4846.2 g m⁻² h⁻¹ and 81.6, respectively, in the recovery of n‐butanol from 1.0 wt % aqueous solution (80 °C). This new method is expected to have serious implications for the preparation of defect‐free mixed‐matrix membranes for many applications.     

Synthesis and Crystal Structure ofp-tert-Butylcalix[4]arene 1,3-Distal and Monosubstituted Semicarbazones and Thiosemicarbazones

A series of p-tert-butylcalix[4]arene 1,3-distal and monosubstituted semicarbazones and thiosemicarbazones was preparedd by acid catalyzed condensation reaction of active calixarene aldehydes with semi- carbazide and thiocarbazide in methanol. One representative single crystal was determined by X-ray dirraction method, which shows that calixarene exists in cone configuration and intramolecular hydrogen-bands exist in the crystal.     

储存环束流Robinson不稳定性的分析和测量

探讨了储存环束流的Robinson不稳定性问题,提出用“等效失谐角大于零”取代“失谐角大于零”作为束流稳定的基本条件。在合肥光源电子储存环200 MeV注入状态下,对束流不稳定性与高频腔失谐之间的关系进行了实验测量。结果表明：当束流稳定条件不满足时,如果高频腔大失谐,束流将全部丢失;小失谐时束流容易部分丢失;当高频腔处于负失谐状态,束流流强将限制在较低水平。     

一种恒定束宽波束形成矩阵的加权正交化方法

提出了一种加权正交化恒定束宽波束形成矩阵。对正交后不同频率分量对应的波束形成矩阵进行不同程度的加权,可以得到无畸变的波束输出信号,保证检测能力;并且当信号源具有均匀谱的情况下,可以实现波束形成前后无能量损失,获得高的方位估计性能。计算机仿真和水池实验数据分析证实了加权正交化方法可同时获得高的检测性能和方位估计性能。     

Ni／丝光沸石覆盖物的特性

采用蒸气相法合成了Ｎｉ／丝光沸石覆盖物，用ＸＲＤ，ＳＥＭ，电子能谱证明了合成的材料为丝光沸石包覆于金属镍粉表面成的复合物。用二甲本异构化探针反应和ＮＨ３－ＴＰＤ考察了该包覆物的催化活性及酸性。结果表明，Ｎｉ／丝光沸石覆盖物具有良好的表面酸性，二甲苯异构化的活性均高于采用同样方法合成的Ｃｒ／丝光沸石覆盖物，间二甲苯异构化活性可以达到９７％。     

A weighting orthogonal method for constant beamwidth beamforming matrices

A weighting orthogonal method for constant beamwidth beamforming matrices is proposed. This method multiplies weighting factors to each orthogonal beamforming matrix corresponding to different frequency bins. The method proposed doesn't cause waveform aberration, and doesn't cause additional loss of array signal-to-noise ratio when the sources have uniform spectrum. The waveform aberration and additional loss of array signal-to-noise ratio can not be avoided simultaneously by ordinary orthogonal method. So we can get good detection and estimation performances at the same time by the weightmg method. Simulation results and water tank experiments are presented to confirm the conclusion above.     

MCP的动态范围与增益—调整MCP电压提高成像清晰度的讨论

本文分析了MCP的动态范围与增益之间的关系,指出两者是一对矛盾;增益越大,动态范围越小,反之亦然。而动态范围越大,灰度级分辨力越高,成像越清晰。应用MCP,应在保证足够增益的前提下,尽量使其在较大动态范围下运转,以便使成像更清晰。调整MCP工作电压提高成像清晰度的实质,正是由于牺牲部分增益提高了动态范围的结果。     

LF—11激光装置的高效率倍频系统

本文介绍了LF—11激光装置高效率倍频系统的原理和结构,阐述了实现高效率倍频的各种技术途径,给出了倍频的转换效率,晶体的调谐半宽度以及基频激光和倍频激光的远场发散角,近场分布和时间波形等实验结果,利用该系统进行了0.53μm波长激光的ICF实验。     

在水蒸气气氛中合成沸石分子筛及其特性

无定型硅铝凝胶－Ｎａ２Ｏ－Ａｌ２Ｏ３－ＳｉＯ２－Ｈ２Ｏ在水蒸气相中可以晶化合成出ＬＴＡ，ＦＡＵ和ＭＯＲ沸石晶体。本文重点研究了ＭＯＲ沸石的晶化条件和物理化学特性。