Application of the stain-fixative nigrosin-HgCl2-formalin to fragile or contractile ciliates.
D016798:Ciliophora / Q000166:cytology*; D005557:Formaldehyde; D008628:Mercury; D008722:Methods; D013194:Staining and Labeling
D005557:Formaldehyde; D008628:Mercury