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Temporary micro-lens effect. (a) Timecourse of the intensity and (b) images of E.coli bacteria during a complete evaporation of a 1µL droplet. The bacteria, at first undetectable (1), is revealed when in the meniscus (2) and disappears back when evaporation is complete (3). The three graphs represent three independent trials. The cover glass is here slightly hydrophobic, no thin wetting film remains after the evaporation.
