MACBETH与PROMETHEE在废弃物再生利用系统评价中的应用

利用特尔菲法确定废弃物再生利用系统评价指标体系,综合考虑经济、技术和环境等属性,应用MACBETH(Measuring Attractiveness by Categorical Based Evaluation Technique)确定属性权重,再借助于PROMETHEE(Preference Ranking Organization Method for Enrichment Evaluation)对再生利用系统的绩效进行综合评价,并应用多元统计方法建立GAIA(Geometric Analysis for Interactive Aid)平面,分析决策结果的灵敏度.最后给出MACBETH和PROMETHEE多属性决策方法在废弃物再生利用系统绩效评价中的具体应用.     

Zum Nachweis von Aminosäuren im 10−10-Mol-Maßstab. Trennung von 1-Dimethylamino-naphthalin-5-sulfonyl-aminosäuren auf Dünnschichtchromatogrammen

Summary Some solvent systems are described for the separation of 1-dimethyl-amino-naphthalene-5-sulphonylamino acids on thin layer chromatograms. 10^–10 mole per amino acid can be detected on a two-dimensional chromatogram, when the yellow fluorescence of these compounds is excited by a UV-lamp.     

Wza the translocon for E. coli capsular polysaccharides defines a new class of membrane protein

Many types of bacteria produce extracellular polysaccharides (EPSs). Some are secreted polymers and show only limited association with the cell surface, whereas others are firmly attached to the cell surface and form a discrete structural layer, the capsule, which envelopes the cell and allows the bacteria to evade or counteract the host immune system. EPSs have critical roles in bacterial colonization of surfaces, such as epithelia and medical implants; in addition some EPSs have important industrial and biomedical applications in their own right. Here we describe the 2.26 A resolution structure of the 340 kDa octamer of Wza, an integral outer membrane lipoprotein, which is essential for group 1 capsule export in Escherichia coli. The transmembrane region is a novel alpha-helical barrel. The bulk of the Wza structure is located in the periplasm and comprises three novel domains forming a large central cavity. Wza is open to the extracellular environment but closed to the periplasm. We propose a route and mechanism for translocation of the capsular polysaccharide. This work may provide insight into the export of other large polar molecules such as DNA and proteins.