A stereo-μ -PIV system for the measurement of all three components of the velocity vector in ameasurement plane (2D-3C) in a closed microchannel has been developed and first test measurements have beenperformed on the three-dimensional laminar flow in a T-shaped micromixer. Stereo-μ -PIV measurements in closedmicrochannels require a calibration based on the self-calibration of the tracer particle images. In order to include theeffects of different refractive indices of the water in the microchannel, the glass of the entrance window, and thesurrounding air a three-media-model is included in the triangulation procedure of the self calibration. A preliminarytest case shows that the stereo-μ -PIV results deviate less than 5% from theoretical values. First measurements in themixing zone of a T-shaped micromixer show that three-dimensional flow in a microchannel can be resolved,however, the accuracy of the measurements needs to be improved.
离子交换是温和条件下分离蛋白质混合物的一个非常有用的技术,最常见的是应用增加盐浓度的缓梯度溶液进行洗脱。pH 梯度洗脱使用频率较低(除专属应用外,例如色谱聚焦),并且需要复杂的缓冲液体系。尽管如此,如今的四元液相色谱系统完全能够利用常规缓冲盐实现pH 梯度洗脱。本篇应用报告中,我们展示了pH 梯度洗脱在分离单克隆抗体带电异构体时的优势。本文的工作使用了Agilent Bio mAb 色谱柱、安捷伦1260 Infinity 生物惰性四元液相色谱系统和安捷伦缓冲液顾问软件。
在瑞典西南部的莫恩达尔,地质年代学研究的重点是霍西卡湖附近的一种具有基性层和横切伟晶岩脉的混合岩。本研究利用锆石LA-ICPMS U-Pb测年法获得的年份即岩石的地质历史,并将混合岩与波罗的海地盾西段的Kallebä ck Suite相联系起来。岩浆结晶时代确定为1598± 13Ma,其混合岩化年龄与挪威西部段变质峰的1030Ma相匹配。