被引排行
Treatment of Wastewater Containing Lead by Ferrite Precipitation
JIN Yan~(1),LI Dun-shun~(2),CAO Yang~(1)(1.Environment Monitoring Station of Huangshi City,Huangshi 435002,China;2.Daye Non-ferrous Metals Company Limitted,Huangshi 435002,China)In this paper,the removal of Pb2+from water with ferrite is studied.The effects of pH,temperature,dosage of material,precipitation time have been discussed.The results show that it is effective with ferrite to remove Pb2+ at room temperature with pH 8.
Progress on Synthesis and Application of Polycaprolactone
WANG Yong-liang,YI Guo-bin,KANG Zheng,XIONG Fu-hua,ZHOU Ping,CUI Yi-hua(Faculty of Chemical Engineering and Light Industry,Guangdong University of Technology,Guangzhou 510006,China)The properties,synthesis and application of polycaprolactone are reviewed.Main initiation systems,auxiliary means for the ring-opening polymerization of ε-caprolactone to obtain polycaprolactone and their application as biomedical materials are focused on and the developing direction is respected.
Research Progress of Influence of Impurities on Solution Crystallization
GONG Hai-yan,LI Cai-hong,WANG Pei-pei,WANG Hong-qiang (College of Chemical Engineering,Inner Mongolia University of Technology,Hohhot 010051,China)In the process of solution crystallization,impurities have dramatic effects on the status of solution and processes of nucleation,crystal growth and agglomeration,and then exert influences on the crystal growth habit,particle size and particle size distribution.The influence of impurities on crystallization process and properties of products has been reviewed.The effect of impurities on the step growth rate of crystalline surface is analyzed at the microcosmic level.The importance of impurities′ effects on crystallization process,the problems in this field and the future research direction are also discussed.
Study on Partition and Purification of Protein by Aqueous Two-phase Technology
ZHENG Nan,LIU Jie(College of Environmental Science and Engineering,Nanchang University,Nanchang 330029,China)The fundamental extraction mechanism of aqueous two-phase system is explained.And the factors which influence partition and purification of protein are researched in detail.In the end,The application and expectation of aqueous two-phase technology in protein partition and purification are discussed.
Study on Treatment of Emulsified Oil Wastewater
YAN Li, YANG Chang-zhu (School of Environmental Science & Engineering, Huazhong University of Science & Technology , Wuhan 430074,China)Recent techniques in the treatment are fully discussed in the paper, recommend domestic and international emerging techniques and devices in the research of emulsified oil wastewater treatment.
Density Functional Theory Investigation on Antioxidant Activity of Flavonoids fromAstragalus
LIU Jingli;YU Haidong;LIANG Yanni;In order to investigate the antioxidant activity of flavonoids fromAstragalus,we performed quantum chemical calculations for four flavonoids including calycosin,calycosin-7-glucoside,formononetin,ononin by density functional theory(DFT)B3 LYP method at the 6-31+G**level,and obtained the optimum geometric structures of the four flavonoids and their corresponding free radicals.Moreover,we analyzed the relationship between the structure and antioxidant activity of flavonoids on the basis of the quantum chemical parameters,the bond length of phenolic hydroxyl,the natural bond order(NBO)charges,the bond dissociation energy(BDE)of phenolic hydroxyl,and adiabatic ionization potential(IP).The results show that the sequence of antioxidant activity of the four flavonoids is as follows:calycosin>calycosin-7-glucoside>formononetin>ononin,which is consistent well with the experimental conclusions.Among them,the site of C3′-OH of calycosin is more active than the site of C7-OH.Meanwhile,we investigated the influences of different polar solvents on antioxidant activity.The results indicate that the antioxidant activity decreases with the increasing of solvent polarity in the hydrogen abstraction mechanism.While the antioxidant activity increases with the increasing of solvent polarityin the single electron transfer mechanism.
Research Progress on Polysaccharide Containing Selenium
WANG Yan-yu,WU Hai-ge,GAO Da-bin,YIN Jing-mei,YAO Zi-ang (Liaoning Key Laboratory of Bioorganic Chemistry,Dalian University,Dalian 116622,China)Polysaccharide containing selenium is a type of organoselenium compounds.It has many kinds of bioactivities,such as anticancer activity,antioxidation,decreasing the levels of blood glucose and lipids,etc.In the health care and medicine fields,it shows exciting prospects.This review mainly summarizes the origin,structure and bioactivities of polysaccharide containing selenium.
Study on Methodology of Lentinan by Ultrasonic Extracted and Ultra-filtration
NIAN Bao-yi,WANG Zheng-min,HUANG He-ning (Department of Chemistry & Biological Engineering, Sanming College, Sanming 365004, China)Ultrasonic extraction by water, ultra-filter separation and methodology process of lentinan were studied. The results showed that extraction rate increased, and extraction time, stock-extract ratio, viscosity of extract decreased; then concentration polarization of ultra-filter separation decreased, curing rate increased. Extraction rate of lentinan is 6. 62%, the main indexing are follows:2 h accessory ultrasonic extracted by water, 1 : 15( V : V) stock-extract ratio, 80 W ultrasonic power, 13 min cutting times. In view of economic effectiveness and methodology feasibility that ultrasound can decrease production load and cost.
Researching and Application of Superoxide Dismutase
YANG Dong-sheng (Bioengineering Department of Technology College , Ha nan University, Haikou 570228, China )This paper have introduced the developing of superoxide dismutase(SOD). The conclusion was basing on the structure and activity of SOD, expatiating the mechanism about SOD fights cellular damage from free radicals and the principle of modified SOD. Also telled the lastest discovers about SOD that applied in medical field and health care field.