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.     

L-白氨酸拆分手性药物的毛细管电泳实验

将教学与科研相结合，以科研成果充实和更新实验教学内容．借助一个快速、、简单、实用的毛细管电泳实验，帮助学生了解毛细管电泳分析技术中的一些基本概念及其实际应用情况．     

精浆糖蛋白分析及其临床应用

本文报告了测定精浆糖蛋白总量及聚丙烯酰胺凝胶电泳分析糖蛋白组分的实验方法。对99例正常生育男性的精浆和96例男性不育症患者的精浆糖精浆糖蛋白总量蛋白总量进行了统计学处理。正常精浆糖蛋白总量为2.60±0.73g/dl,不育症患者为3.02±0 64g/dl,t=4.15.P<0.01。在96例不育症中有36例前列腺炎,18例小睾丸,10例副睾炎和6例精索静脉曲张,其糖蛋白总量分别为3.07±0.67g/dl,2.93±0.65g/dl,3.11±0.52g/dl 和2.63±0.92g/dl。与正常精浆相比,t 值显著性检验)分别为3.379(P<0.001),2.481(P<0.02),2.15(P<0.05)和0.095(P<0.05)。本文还对1例正常精浆和4例临床病因不同引起不育者的精浆进行了聚丙烯酰胺凝胶电脉分析,结果提示正常人与不育者在精浆糖蛋白组分上有很大差异,这种差异的临床意义还待进一步研究。     

超声透析CE—ICP—AES分析大鼠全血中镁的形态

将超声波应用于微透析与CE—ICP—AES联用技术,自行设计了超声透析装置,并将该联用技术用于大鼠全血中Mg的形态分析。实验优化条件为：融熔毛细管120cm×100μm（I．D．）;缓冲溶液50mmol·L^-1 Tris—HCI（pH7．4）;电泳电压18KV。在该条件下分析出镁以四种形态存在于大鼠血液透析液中,并通过标准Mg的迁移时间及加标后迁移时间对透析液中游离镁形态进行了表征,峰面积定量透析液中游离镁的含量为24．2mg·L^-1,RSD〈5％,该方法加标回收率为96．0％-103．6％。     

Utility of serum indices in a particular case of serum protein electrophoresis

Screening and measurement of monoclonal (M) proteins are commonly performed using capillary zone electrophoresis (CZE). The identification of M-protein or monoclonal component (CM) is an essential requirement for diagnosis and monitoring of monoclonal gammopathies. The detection of CM has been largely improved by CZE. Capillary electrophoresis estimates CM more accurately, because absence of variation due to different dye binding affinities of proteins as instead seen with agarose gel electrophoresis. However, interferences can be present in CZE. This occurs because all substances absorbing at 200 nm can be identified. Recognition and handling of specimens exhibiting such interferences is essential to ensure accurate diagnostic and patient safety. We herein report on an unusual case of serum protein electrophoresis, to highlight that laboratory staff must be aware of and familiarise with the information provided by laboratory instruments. For example, in the case of serum indices, about specimen quality.     

碳纳米管在VFD场发射阴极中的应用研究

将碳纳米管运用电泳的方法沉积在图形化阴极电极,制备了碳纳米管场发射阴极．并对封装了这种阴极的三极型VFD进行了电子发射性能和发光特性的测试．实验表明用本文方法制备的碳纳米管阴极做电子场发射源的三极型VFD连续点亮了20小时,在15小时内电流波动性不大于7％,并且有良好的发光均匀性和发光亮度。     

突显程度的“这／那个＋V／A”

“这／那个＋V／A”是现代汉语尤其是口语中表示突显程度义的常用结构之一,这一结构经常与人称代词和感叹语气词搭配,不仅凸显了焦点“V／A”,而且注入了说话人的主观情感和态度,具有强烈的主观化色彩。这一结构形成和发展的主要原因是“这／那个”指称性下降、陈述性上升。     

单细胞凝胶电泳技术及其用途

单细胞凝胶电泳技术经历了一个产生、发展的过程,在环境毒理学研究与疾病检测方面有着广泛的运用.     

毛细管电泳手性拆分研究及应用进展

对毛细管电泳在手性拆分领域的应用和发展进行了综述，包括手性添加剂的选择和可能的拆分机理，并对该领域未来的发展方向作出展望，显示出毛细管电泳是手性拆分的一种高效、快速、简便的分离手段。     

蛋白质组学研究进展及展望

蛋白质组从蛋白质整体水平上研究其作用模式、功能机理、调节调控以及蛋白质组群内的相互作用，从而为临床诊断、病理研究、药物筛选、新药开发、新陈代谢途径研究等提供理论依据和基础。蛋白质组的研究手段主要有2DE、质谱技术以及研究蛋白质之间相互作用的酵母双杂交、表面等离子技术等。本简单地回顾了近年来蛋白质组学研究的一些成果及该领域近年来的发展动态。