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Biochim Biophys Acta. 2003 Dec 5;1624(1-3):76-80.

Growth and membrane polarization in Pseudomonas aeruginosa UG2 grown in randomized microgravity in a high aspect ratio vessel.

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Laboratory of Microbial Technology, Department of Environmental Biology, University of Guelph, Guelph, ON, Canada N1G 2W1.


Growth and membrane polarization of Pseudomonas aeruginosa UG2 cells grown under randomized microgravity (RMG) and 1xg were measured in a high aspect ratio vessel (HARV) and also in batch cultures mixed at 12 and 150 rpm in Erlenmeyer shake flasks. Membrane polarization was measured using the fluorescent probe, 1,6-diphenyl-1,3,5-hexatriene (DPH). No differences were observed in the growth curves or membrane polarization values (about 0.300) under all three culture conditions. However, the net effect of RMG at the single cell level may be still unknown. It may be possible that RMG effects are species-dependent or bacterial cells with a small mass and volume may be near the threshold where RMG exerts a minimal effect.

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