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Localization of the PR4 (pK4-EL2-1) strain in two phase cultures containing alkanes of various carbon chain lengths (upper series). The lower series shows phase-contrast micrographs of hydrocarbon droplets illustrating differences in bacterial localization. “AL” and “AQ” indicate the alkane phase and aqueous supernatant phase, respectively. All photographs show the same magnification. Scale bar=5 μm.
