Microalgal cultures were evaluated by bright-field and fluorescent microscopy. This was performed using a Leica DM2500 microscope (Leica Microsystems, Wetzlar, Germany), equipped with the attached Leica DFC 700T camera. Chlorophyll autofluorescence was excited by a UV-lamp HXP 120 of the same manufacturer, using the band-pass filter Y3 (565–610 nm). The fluorescence was excited by a UV-shutter.
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