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Malyhon

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2.5. Acridine Orange Staining. At the fifth day of culturing, cells
grown on different filmswerewashedwith PBS and stained with 0.1mg/mL
acridine orange (Sigma-Aldrich) at room temperature in darkness for
30 min. Then, all the samples were washed with PBS to remove the residual
dye and observed through an inverted fluorescencemicroscope (Nikon Ti).
2.6. Cell Viability Assay. Cell viability was measured with Cell
Counting Kit-8 (CCK-8, Dojindo, Japan) according to the manufacture¡¯s
protocol. The amount of the formazan dye generated by the activity of
dehydrogenases in cells on highly water-soluble tetrazolium salt is directly
proportional to the number of living cells. Cells were cultured on different
PHBVfilms in 48-well plates with six repeats. In brief, at 1, 3, and 5 days after
cell seeding, 20 ¦ÌL ofCCK-8 solution was added to each well and incubated
in the incubator for 3 h; then, 100 ¦ÌL of solution per well was transferred to
a 96-well plate and read at 450 nm with a microplate reader (Symergy HT,
Biotek). Cell viability can be continually tested in the same well without any
toxicity to the cells.

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