[Effect of the isolation method and staining procedure on the morphology of the virion ribonucleoprotein of Sendai virus].

Electron microscopic examinations of morphology of Sendai virus ribonucleoprotein (RNP) isolated from purified virions by two methods and simultaneous staining of the preparations with uranyl acetate and phosphotungstate acid (PTA) were carried out. The staining method was shown not to influence the kind of nucleoproteins which had been isolated from disrupted virions by sucrose density gradient centrifugation. With both strains RNP appeared as strongly helixed filaments. The staining method, however, strongly influenced morphology of RNP isolated from disrupted virions by equilibrium centrifugation in cesium chloride density gradient. After uranyl acetate staining RNP had an appearance of hard filaments whereas in the same preparation stained with PTA partially and completely unwound spirals of nucleocapsid were found alongside with strongly spiralized structures.