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. 2012 Jun 19;7(6):e38895. doi: 10.1371/journal.pone.0038895

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Furlan et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Photo-movement assay conducted using bright field microscopy (left). A lateral green light source is used to obtain a photophobic response from an algae population swimming in the PDMS microfluidic channel. (right) PIV velocity field (red arrows) extracted from two consecutive frames, superimposed on the correspondening movie snapshot showing the spatial distribution of the algae (scale bar = 200 ). The polar angle represents the orientation of the velocity field vectors with respect to the phototaxis gradient direction

Inline graphic — Photo-movement assay conducted using bright field microscopy (left). A lateral green light source is used to obtain a photophobic response from an algae population swimming in the PDMS microfluidic channel. (right) PIV velocity field (red arrows) extracted from two consecutive frames, superimposed on the correspondening movie snapshot showing the spatial distribution of the algae (scale bar = 200 ). The polar angle represents the orientation of the velocity field vectors with respect to the phototaxis gradient direction