盐酸菜中降胆固醇、亚硝酸盐乳酸菌筛选及功能特性研究

以独山传统工艺制作盐酸菜液为研究对象,运用涂布法分离纯化乳酸菌。采用生理生化试验和分子生物学法,鉴定菌株Y-12为棉籽糖乳球菌（Lactococcus raffinolactis）。运用比色法测定其对胆固醇和亚硝酸盐清除能力,该菌株对胆固醇和亚硝酸盐的降解率分别为78.15%和75.17%。对菌株Y-12进行耐酸、耐盐和耐胆盐试验研究,结果表明,菌株Y-12在pH值为≥2.5的酸性环境中能正常生长,能够耐受5%NaCl和0.3%胆盐。     

Global warming potentials of Hydrofluoroethers

Global warming potentials are estimated for hydrofluoroethers, which are an emerging class of compounds for industrial use. Comparisons are made to the limited data previously available before observations about molecular design are discussed. We quantify how molecular structure can be manipulated to reduce environmental impacts due to global warming. We further highlight the need for additional research on this class of compounds so environmental performance can be assessed for green design.     

丙烯腈装置长周期运行的技术分析与对策

分析了影响丙烯腈装置长周期运行的关键因素，提出了相应的对策，并应用于生产实践之中，取得了显著的效果，对于指导同类型装置长周期运行有着积极的推广和应用价值。     

Exploring the influence of particle shape and air velocity on the flowability in the respiratory tract: a computational fluid dynamics approach

Dry powder inhalers (DPIs) are considered a main drug delivery system through pulmonary route. The main objective of this work is to study the flow of differently shaped microparticles in order to find the optimum shape of drug particles that will demonstrate the best flow to the deep lung. The flowability of particles in air or any fluid depends particularly on the drag force which is defined as the resistance of the fluid molecules to the particle flow. One of the most important parameters that affect the drag force is the particles’ shape. Computational simulations using COMSOL Multi Physics 5.2 software were performed for investigating the particles flow in the air pathways of lung, and the drag force was calculated for different particles shapes. This was accomplished by screening a set of 17 possible shapes that are expected to be synthesized easily in the micro-scale. In addition, the macro-scale behavior of the investigated shapes was also simulated so as to compare the behavior of the flowing particles in both cases. A very big difference was found between the behavior of particles’ flow in the micro and macro scales, but a similar behavior can be obtained if the flow velocity of the microparticles is very high. It was also found that the micro-triangle with aspect ratio 2:1 has the least drag force in both deep and upper lung; so, it should be the shape of choice during the process of particle synthesis for pulmonary drug delivery.