2.6. Fluorescence microscopy
PHB granules in Synechocystis cells were visualized by staining
with the fluorescent dye Nile red. The 20 lL of cell culture was
added with 100 lL of 0.9% (w/v) NaCl and 0.3 lL of Nile red solution
(1.0 lg/mL in ethanol), mixed and incubated overnight under
darkness before observation under fluorescence microscope
equipped with a digital camera (Olympus DP72, Japan), using a filter
cube with 535 excitation wavelength.