RUI: Molecular Tracer Diffusion Measurements Within the Biomixing Generated by Swimming E. Coli

RUI：游动大肠杆菌产生的生物混合内的分子示踪剂扩散测量

• 批准号: 1205313
• 负责人: Daniel Spiegel
• 金额: $ 15.17万
• 依托单位: Trinity University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-09-01 至 2015-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1205313&HistoricalAwards=false
• 关键词: RUI; Molecular; Tracer; Diffusion; Measurements

In this project the PI will work with Trinity undergraduates to employ the laser-induced-grating experimental technique, forced Rayleigh scattering (FRS), for measurements of molecular-tracer diffusion coefficients within E. coli baths to see if the diffusion coefficients on micron length scales increase with the bacterial concentration. The PI will also show using simple Fourier concepts that FRS can be uniquely employed to directly measure and quantify Lévy deviations from Gaussian diffusion if the tracer molecules are indeed driven into Lévy flights by the swimmers. This work on molecular transport at the very small Reynolds number will help significantly in a complete comprehension of swimmer-driven small-molecule flux over ranges of swimmer length scales and Reynolds numbers that describe all marine organisms. The PI will also collaborate with a Trinity microbiologist to develop an undergraduate laboratory experiment in which students investigate the manner in which E. coli have evolved so that they outrun molecular diffusion during chemotaxis.

在该项目中，PI与三位一体一起使用激光激光晶粒实验技术，迫使Rayleigh rs），用于测量大肠杆菌浴中分子跟踪扩散系数的测量，如果微米长度尺度的差异会增加。 Will Will Will Will Will will对游泳者的体长度尺度和描述Allinesms的雷诺数字的理解也将与三位一体的dergradgradebal Laboratory实验合作，学生会研究大肠杆菌的演变方式趋化过程中的分子扩散。