太湖土著菌MC-LTH11的筛选及其对藻毒素-RR和-LR的生物降解(英文)

从太湖中成功筛选出一株能够同时降解微囊藻毒素-RR(MC-RR)和微囊藻毒素-LR(MC-LR)的土著细菌MC-LTH11.经鉴定,该菌属寡养单胞菌属,并含有mlrA基因.在含有藻毒素粗提物的培养基中,MCLTH11能够在6 d内将初浓度分别为37.13 mg/L的MC-RR和18.49 mg/L的MC-LR完全降解,并且降解速度受到pH值、温度、初始微囊藻毒素浓度和培养基种类的影响.此外,MC-LTH11能够在1 d内完全降解太湖水样中的微囊藻毒素.研究结果表明,寡养单胞菌MC-LTH11具备对微囊藻毒素污染水体的修复能力,并可能是太湖水华爆发后微囊藻毒素降解的重要因素.     

项目教学法的应用探讨

针对生搬硬套项目教学法在实际应用中可能出现的问题,提出五种具体的做法,并结合课程实践说明这些做法的有效性.     

指示剂有机试剂铬天青S的纯化研究

报告了铬天青S的硅胶干柱层析法的纯化方法,探讨了固定相、淋洗液、洗脱剂对纯化产物的影响,确定了以层析硅胶为固定相,以正丁醇：吡啶：氨水=2：1：1为淋洗剂,以蒸馏水为洗脱剂的纯化条件,经过红外光谱和液相色谱表证,使用本方法可获得纯度大于98.59%的产品,结果令人满意。     

高效液相色谱法测定废水中痕量酚

研究了用甲醇、水、磷酸二氩钾,醋酸作流动相,从Ｚｏｒｂａｘ－ＯＤＳ色谱柱上分离并直接测定酚类的诸条件,方法的回收率在９２％￣９８％之间,最低检出限为０．００５μｇ。本方法适于测定工业废水,地表水及自来水中的酚类。     

安徽对我国古代印刷史的贡献

本从活字印刷术的运用和完善,套印术的产生和创新。“短版”、“拱花”技能的研创和应用这三个方面,概述了安畿对我国印刷史的杰出贡献。     

钨酸纳结晶水合物的低压气相色谱特性研究

研究了钨酸钠结晶水合物的低压色谱柱的色谱行为 ,并与常压色谱特征进行了比较 .低压下该柱的柱效有较大的提高 ,且分析速度加快 ,检测灵敏度 ,分离度、拖尾因子等都得到了较好的改善 .对极性较弱的有机化合物 ,特别是对于烷烃有良好的分离效果     

福州地区外墙渗水的对策

作者通过对福州地区外墙渗水情况的调查分析,着重介绍外墙渗漏的成因及其防治措施,并从设计、施工等方面提出建议。     

Removal of Organic Acids from Indoor Air in Museum Storage Rooms by Active and Passive Sorption Techniques

ABSTRACT

Adsorbent materials can be used for the removal of organic acids from air in storage rooms with heritage collections. The organic acid removal efficiency of two commercially available activated carbon air-filters were tested in situ in two unoccupied stores with densely packed collections. One filter was designed for outdoor type pollutants (Filter A), while the other was designed for organic acids in indoor air (Filter B). Furthermore, the acetic acid removal efficiency of a desiccant silica gel rotor used for dehumidification was measured in a laboratory at different relative humidity levels. Finally, passive removal of acetic acid by silica gel and unfired clay brick were tested in a chamber, and for clay brick at room level as well. Filter B had the highest removal efficiency. The removal efficiency of both filter types depended on the airflow and the filter performance varied considerably in situ from the values reported from standard laboratory tests. Increasing the filter airflow reduced the removal efficiency from 77% and down to 7% for Filter A, and from 92% to 24% for Filter B. There was almost no effect of active air filtration on the concentration of organic acids when this was measured in the middle and in the corner of the storage rooms away from the ventilation inlets. The desiccant dehumidifier removed 98–100% of the acetic acid from the air, independently of the relative humidity. The desiccant rotor will, however, only be running when there is a need for dehumidification and as a result will only periodically remove pollutants. The high acid removal efficiency by dry silica gel was furthermore demonstrated in a chamber test. A clay brick wall in a test room established a concentration gradient across the room and reduced the concentration of organic acids by 56% compared to close to the emission source.     

杯[4]芳烃聚硅氧烷固定相分离芳香异构体

近20年来的研究表明,各种杯芳烃在模拟酶催化、物质的分离和检测、功能材料等领域有着广阔的应用前景.本文选用难分离的位置异构体对所制备的杯[4]芳烃聚硅氧烷固定相色谱柱进行了应用研究.结果表明,含有杯芳烃衍生物的混合固定相,对多数芳香族位置异构体化合物均有良好的选择和分离能力.     

核桃软糖防粘结初步研究

针对核桃软糖在气温稍高、温度较大的环境中容易粘结,造成质量下降和贮藏期缩短的现象,通过改进配方和工艺防止和延缓核桃软糖粘结,延长了产品的贮藏时间.