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Apoptosis and necrosis are among several types of cell death. We stained the nuclei of Aspergillus nidulans grown in micro-colonies with ethidium bromide and acridine orange to detect in situ apoptosis. Suspensions of conidia from 5-day-old colonies of the A. nidulans strains biA1methG1, G422, CLC100, and CLB3 were each put into two tubes. The suspension of one tube was irradiated with ultraviolet light for 20 s, whereas the other tube was not exposed to irradiation. The two suspensions were inoculated in complete liquid medium and 50-µL samples were placed on sterilized cover slips, spread on the surface of solid culture media on Petri dishes. After the micro-colonies were formed, the material on the cover slips was stained with ethidium bromide and acridine orange, placed on the lamina and observed under a fluorescence microscope. This staining method was efficient in discriminating normal nuclei from those going apoptosis and necrosis. Results have shown that irradiation provokes apoptosis but does not induce necrosis. There were no differences between the three strains and all data were considered to be statistically significant.

In situ analysis of apoptosis in Aspergillus nidulans with ethidium bromide and acridine orange