Negative staining of viruses.
D000447:Aldehydes; D005374:Filtration; D005612:Freeze Drying; D006652:Histological Techniques; D006863:Hydrogen-Ion Concentration; D008854:Microscopy, Electron; D009975:Orthomyxoviridae; D010222:Parainfluenza Virus 1, Human; D010772:Phosphotungstic Acid; D013194:Staining and Labeling; D014780:Viruses
D000447:Aldehydes; D010772:Phosphotungstic Acid