Feulgen staining of rat liver fixed in different fixatives.

In the present study rat liver pieces fixed in 1) 10 per cent buffered neutral formalin, 2) 4 per cent glutaraldehyde, 3) Heidenhain's-Susa fixative and 4) Flemming's fluid, and following hydrolysis in 1-0 N HC1 at 60degreesC for varying time periods have been stained with the UV Feulgen procedure. The results of this study reveal that following hydrolysis for different time periods the tissue material fixed in formalin show the same staining pattern as those fixed in glutaraldehyde. The material fixed in Heidenhain's-Susa displays an intense Feulgen staining after two different times of hydrolysis, and that fixed in Flemming's fluid shows particular staining intensity for a prolonged time period thus indicating better preservation of DNA than in the materials fixed in the other three fixtatives.