1. Articles from Raymond E. Goldstein

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    1. Feature Of The Week 9/27/09: Collective Dynamics of Swimming Bacteria: OCT Studies

      Feature Of The Week 9/27/09: Collective Dynamics of Swimming Bacteria: OCT Studies

      Feature Of The Week 9/27/09: Physical mechanisms governing large-scale organization of self-propelled biological microparticles, such as motor proteins, swimming bacteria, and other motile cells, attract significant attention among physicists and biologists. Scientists from Argonne National Laboratory, Imalux, and Cambridge University, discovered that commonly found bacteria such as Bacillus Subtilis are in fact highly efficient mixers for the liquid they live in. Thanks to original non-invasive optical coherence tomography developed by Imalux Corporation, OH, the scientists observed with unprecedented precision the phenomena unfolding in the liquid containing the bacterial suspension. The measurements revealed up to 100-fold increase of mixing ...

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    2. Enhanced mixing and spatial instability in concentrated bacterial suspensions

      High-resolution optical coherence tomography is used to study the onset of a large-scale convective motion in free-standing thin films of adjustable thickness containing suspensions of swimming aerobic bacteria. Clear evidence is found that beyond a threshold film thickness there exists a transition from quasi-two-dimensional collective swimming to three-dimensional turbulent behavior. The latter state, qualitatively different from bioconvection in dilute bacterial suspensions, is characterized by enhanced diffusivities of oxygen and bacteria. These results emphasize the impact of self-organized bacterial locomotion on the onset of three-dimensional dynamics, and suggest key ingredients necessary to extend standard models of bioconvection to incorporate effects of ...
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  2. Topics in the News

    1. (2 articles) Argonne National Laboratory
    2. (2 articles) Imalux
    3. (1 articles) University of Cambridge
    4. (1 articles) Princeton University
    5. (1 articles) Kyoto University Graduate School of Medicine
    6. (1 articles) Carl Zeiss Meditec
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    Feature Of The Week 9/27/09: Collective Dynamics of Swimming Bacteria: OCT Studies Quantification of biomechanical properties of human corneal scar using acoustic radiation force optical coherence elastography Longitudinal changes in complete avascular area assessed using anterior segmental optical coherence tomography angiography in filtering trabeculectomy bleb Quantitative Analysis of Radial Peripapillary Capillary Network in Patients With Papilledema Compared with Healthy Subjects Using Optical Coherence Tomography Angiography Reproducibility of Retinal Nerve Fiber Layer and Macular Thickness Measurements Using Spectral Domain Optical Coherence Tomography Analysis of Parainflammation in Chronic Glaucoma Using Vitreous-OCT Imaging Impact of Epiretinal Membrane on Optical Coherence Tomography Tools Used for Monitoring Glaucoma An Improved Analytical Model of a Spectrometer for Optical Coherence Tomography Comparison of similar Mueller and Jones matrix method in catheter based polarization sensitive optical coherence tomography Optical coherence tomography and visual evoked potential and its relationship with neurological disability in patients with relapsing-remitting multiple sclerosis Circular functional analysis of OCT data for precise identification of structural phenotypes in the eye Combined anterior segment OCT and wavefront-based autorefractor using a shared beam