基于企业微信平台和在线教育综合平台的线上教学实践

In order to achieve "postponement of school without suspension of learning" during the prevention and control of new coronavirus pneumonia, the online teaching strategy was constructed based on Enterprise WeChat and Integrated Online Education Platform for the online teaching of Separation Science and Technology. The student-centered teaching methods were applied in online teaching process.     

铒离子及其阳离子卟啉配合物对金黄色葡萄球菌生长的抑制和刺激作用

用微量热法研究了Er³⁺、TMP{TMP=5，10，15，20-四(4-甲氧基苯基)卟啉}及其阳离子铒卟啉配合物[Er(TMP)(H₂O)₃]Cl对金黄色葡萄球菌生长作用的生物热动力学特征，求算了在Er³⁺、TMP和[Er(TMP)(H₂O)₃]Cl作用下，金黄色葡萄球菌生长的热动力学参数。实验结果表明：TMP对金黄色葡萄球菌生长的作用表现为单向的抑制作用，而Er³⁺和[Er(TMP)(H₂O)₃]Cl对金黄色葡萄球菌的生长有双向调节作用。在低浓度下，Er³⁺对金黄色葡萄球菌生长的刺激作用强于[Er(TMP)(H₂O)₃]Cl；在较高浓度下，[Er(TMP)(H₂O)₃]Cl对金黄色葡萄球菌生长的抑制作用显著强于Er³⁺。对金黄色葡萄球菌的抗菌活性为：[Er(TMP)(H₂O)₃]Cl>>TMP>Er³⁺。对相互作用机理做了初步探讨。     

Monitoring the Hydrolysis of p—Nitrophenyl Acetate Catalyzed by Seryl—histidine with Electrospray Ionization Mass Spectrometry

ＩｎｔｒｏｄｕｃｔｉｏｎＩｎｔｈｅｐａｓｔｄｅｃａｄｅ ,ｉｔｗａｓｆｏｕｎｄｔｈａｔｔｗｏａｍｉｎｏａｃｉｄｒｅｓｉｄｕｅｓ ,ＳｅｒａｎｄＨｉｓ ,ｗｏｒｋａｓｔｈｅａｃｔｉｖｅｓｉｔｅｓｉｎｔｈｅｓｅｒ ｉｎｅｐｒｏｔｅａｓｅ .1 3 Ｉｎｏｕｒｐｒｅｖｉｏｕｓｗｏｒｋ ,ａｄｉｐｅｐｔｉｄｅｓｅｒｙｌ ｈｉｓｔｉｄｉｎｅ (Ｓｅｒ Ｈｉｓ)ｗａｓｆｏｕｎｄｔｏｈａｖｅｔｈｅｐｒｏｔｅｉｎａｎｄｎｕ ｃｌｅｏｓｉｄｅｓｃｌｅａｖａｇｅａｃｔｉｖｉｔｙ .4 7ｐ Ｎｉｔｒｏｐｈｅｎｙｌａｃｅｔａｔｅ (ｐ ＮＰＡ)ｗ…     

~(19)F-NMR法测定聚醚多元醇中伯羟基的相对含量

<正> 聚醚多元醇是聚氨酯材料的主要原料之一.多元醇中伯羟基含量的多少对反应活性有着直接的影响,因此,准确地测定伯羟基含量已成为许多研究者关心的课题,并已报道了不少测定方法,其中主要包括化学动力学方法、~1H-核磁共振(NMR)法和~(19)F-NMR法,~1H-NMR法系利用不同的酰化剂,将聚醚多元醇酰化后测其酰化物的~1H-NMR谱,从伯、仲羟基相应的酯基氢的积分比例来计算伯羟基的相对含量,但由于体系中存在其它含氢基因,且是大量的,使测量困难或应用受到限制.~(19)F-NMR法测伯羟     

磷脂液相二次离子质谱分析中的分子离子簇

对3种极性头不同的磷脂DMPG、DMPC、DMPE的液相二次离子质谱分析中出现 的分子离子簇现象进行了系统的研究。结果表明，虽然分子离子簇的形成与许多因素有关， 如PH值、离子强度等，但起决定作用的是样品在底物中的浓度，浓度增大有利于分子离子簇 的形成。研究还发现，由不同种类磷脂分子形成的分子离子簇峰明显高于由同种磷脂分子所 形成的分子离子簇峰，指出异种磷脂分子间的簇离子形成能力高于同种磷脂分子。此外还讨 论了磷脂分子在离子源条件下的稳定性、裂解规律及相互作用等。结果表明，本实验所选用 的磷脂分子在LSIMS条件下是稳定的，均能得到较强的分子离子峰，其主要碎片峰是磷酰键断裂而产生的碎片离子峰。     

Diffusion characteristics of a T-type microchannel with different configurations and inlet angles.

A series of symmetrical and asymmetrical microfluidic T-sensors with different inlet angles were fabricated to study the mixing characteristics of a T-type microstructure for generating concentration gradient. Computational fluid dynamics (CFD) simulations showed that the concentration gradient, transition zone and diffusion length were different for various configurations and inlet angles. Quick mix and sharp concentration gradient occurred in the asymmetrical structure with large inlet angle. The observed concentration gradients in the fabricated microchannel were consistent with the theoretical prediction. In this microstructure, stagnant zone and z-direction diffusion also affected the concentration gradient. Based on the simulation results, the microfluidic structure was optimized to generate desired concentration gradient for a cell-based study.     

铜离子交换改性的沸石催化剂上甲烷的非氧芳构化

已有研究表明，ＭｏＯ３／ＨＺＳＭ５是甲烷非氧芳构化的优良催化剂，在９７３Ｋ下甲烷转化率达６％～８％，苯选择性高于８０％，这为非氧气氛下甲烷的芳构化反应展示了非常诱人的前景［１～１２］．但是，该催化剂的活性和稳定性尚有待进一步提高，目前已有使用Ｐｔ，...     

C9‐Iridoids from Scrophularia buergeriana

Four new iridoids, buergerinins B–E ( 1 – 4 ), along with three known iridoids, were isolated from the roots of Scrophularia buergeriana. Their structures were identified on the basis of spectroscopic analysis.     

交联聚磷酸酯的合成及其释药性能研究

以（ｉ－Ｂｕ）３Ａｌ为引发剂研究了２－氢－２－氧－１，３，２二氧五环磷酸酯，２－氢－２－氧－１，３，２－二氧六联药物载体，要用单层骨架片、双层骨架片和夹心片 药方式，对抗肿瘤药物５－氟尿嘧啶进行了控制释放，获得了较好的释药效果。     

Dynamic Study of Gemini Surfactant and Single-chain Surfactant at Air／Water Interface

Molecular dynamics (MD) simulation are used to study the properties of gemini surfactant of ethyl-α,ω-bis(dodecyldimethylammonium bromide) (C12C2C12) and dodecyl-trimethylammonium bromide (DTAB) at the air/water interface, respectively. In the two systems,t he surfactant concentrations are both 28 wt.%, and other conditions are also the same. After reaching the thermodynamic equilibrium, the concentration profiles, the radial distributions functions (RDF) and the mean squared displacement (MSD) are investigated. The results reveal that the surface activity of C12C2C12 surfactant is higher than DTAB surfactant.