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石墨炉原子吸收法测定十年人指甲中铅含量
摘要 用十年时间按季度收集了同一人指甲样品36 份，用石墨炉原子吸收光谱法测定了其铅的含量。此方法具有良好的精密度和准确度，相对标准偏差RSD4.1%；回收率91.3-107%。
关键词 石墨炉原子吸收光谱法；铅；指甲
铅作为有害元素对人体的危害早已引起国内外的关注。铅在环境中广泛存在，人类铅摄入量及铅负荷的升高主要是环境铅污染造成的。铅是亲和性毒物，可以干扰人体许多功能，其中明显的有影响及损害中枢神经及造血系统，1996 年世界卫生组织有关专家提出防止铅对儿童的危害将成为21 世纪的重要公共卫生问题。因此，一种取材容易、简便、快速准确的测定方法是此实验的目的。本方法使用最为普遍的湿法消化分解样品，石墨炉原子吸法测定了指甲中铅的含量，取得了满意的结果。
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上海纳锘实业有限公司
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驱动形状记忆泡沫塑料中速度场,速度矢量场检测方案(粒子图像测速)
Shape memory polymer foams may be used to treat vascular aneurysms through thermal actuation of the foam from a compacted to an expanded configuration within the aneurysm structure, thereby alleviating blood pressure on the weakened aneurysm walls and reducing potential for rupture. After delivery to the aneurysm site, fiber-delivered laser light absorbed by the foam structure is converted into thermal energy, and actuation of the foam results. Introduction of nonphysiological energy into the body during foam actuation necessitates an evaluation of potential thermal damage to nearby tissue.
In the present investigation, the foam is idealized as a heat-dissipating, volumetrically static object centered in a straight tube of flowing water. Velocity profiles around the heat-dissipating device are acquired experimentally with particle image velocimetry. A computational fluid dynamics package is then used to predict the experimental velocity profiles and temperature distributions by numerical solution of the Navier-Stokes and energy equations, and agreement between the computational solution and experimental results is assessed. Discussion of this assessment, as well as several preliminary procedures leading up to the creation of the heat-dissipating device and critical analysis of the methods employed, is also given. PIV and CFD are found to be in reasonable agreement with one another. Using laser-induced fluorescence as a temperature measurement modality, which is discussed in the text insofar as the technique was attempted several times and failed, together with PIV and CFD provides a formidable array of techniques exists to characterize flow around a heated device.
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速度场,速度矢量场
北京欧兰科技发展有限公司
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蛋白中双栖小泡蛋白和N-WASP调节肌蛋白组装的相互作用动力学检测方案(CCD相机)
Amphiphysin 1, an endocytic adaptor concentrated at synapses
that couples clathrin-mediated endocytosis to dynamin-dependent
fission,wasalsoshownto have a regulatory role in actindynamics.
Here, we report that amphiphysin 1 interacts with N-WASP
and stimulates N-WASP- and Arp2/3-dependent actin polymerization.
Both the Src homology 3 and the N-BAR domains are
requiredforthisstimulation.Acidicliposome-triggered,N-WASPdependent
actin polymerization is strongly impaired in brain
cytosol of amphiphysin 1 knock-out mice. FRET-FLIM analysis of
Sertoli cells, where endogenously expressed amphiphysin 1 colocalizes
with N-WASP in peripheral ruffles, confirmed the
association between the two proteins in vivo. This association
undergoes regulation and is enhanced by stimulating phosphatidylserine
receptors on the cell surface with phosphatidylserine-
containing liposomes that trigger ruffle formation.
These results indicate that actin regulation is a key function of
amphiphysin 1 and that such function cooperates with the endocytic
adaptor role and membrane shaping/curvature sensing
properties of the protein during the endocytic reaction.
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双栖小泡蛋白和N-WASP调节肌蛋白组装的相互作用动力学
北京欧兰科技发展有限公司
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