Biomaterial Database

Determination of the buoyant density of canine distemper virus by radioassay. 1975

A M Armitage, and H J Cornwell, and N G Wright, and A R Weir

Canine distemper virus was labelled with tritiated uridine and, following precipitation with saturated ammonium sulphate solution, was concentrated 66-fold by centrifugation through a discontinuous sucrose gradient. When this preparation was centrifuged to equilibrium in density gradients of potassium tartrate or sucrose, radioactivity was distributed over the density range 1.218 to 1.180 with a pronounced peak at around 1.195. This corresponded closely to the distribution of infectivity and also to that of virus particles revealed by electron microscopy. In density gradients of caesium chloride, a plateau of radioactivity was present over the density range 1.26 to 1.24 with a peak at around 1.240 but most of the infectivity was limited to the range of 1.24 to 1.22. Since the amount of infectious virus recovered from potassium tartrate was greater than that recovered from the other two materials and the radioactive peak occurred over a narrower density range, it was concluded that potassium tartrate was the material of choice for the isopycnic centrifugation of canine distemper virus.

UI	MeSH Term	Description	Entries
D007668	Kidney	Body organ that filters blood for the secretion of URINE and that regulates ion concentrations.	Kidneys
D008854	Microscopy, Electron	Microscopy using an electron beam, instead of light, to visualize the sample, thereby allowing much greater magnification. The interactions of ELECTRONS with specimens are used to provide information about the fine structure of that specimen. In TRANSMISSION ELECTRON MICROSCOPY the reactions of the electrons that are transmitted through the specimen are imaged. In SCANNING ELECTRON MICROSCOPY an electron beam falls at a non-normal angle on the specimen and the image is derived from the reactions occurring above the plane of the specimen.	Electron Microscopy
D011232	Chemical Precipitation	The formation of a solid in a solution as a result of a chemical reaction or the aggregation of soluble substances into complexes large enough to fall out of solution.	Precipitation, Chemical
D002460	Cell Line	Established cell cultures that have the potential to propagate indefinitely.	Cell Lines,Line, Cell,Lines, Cell
D002499	Centrifugation, Density Gradient	Separation of particles according to density by employing a gradient of varying densities. At equilibrium each particle settles in the gradient at a point equal to its density. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)	Centrifugations, Density Gradient,Density Gradient Centrifugation,Density Gradient Centrifugations,Gradient Centrifugation, Density,Gradient Centrifugations, Density
D002586	Cesium	A member of the alkali metals. It has an atomic symbol Cs, atomic number 55, and atomic weight 132.91. Cesium has many industrial applications, including the construction of atomic clocks based on its atomic vibrational frequency.	Caesium,Caesium-133,Cesium-133,Caesium 133,Cesium 133
D002712	Chlorides	Inorganic compounds derived from hydrochloric acid that contain the Cl- ion.	Chloride,Chloride Ion Level,Ion Level, Chloride,Level, Chloride Ion
D003588	Cytopathogenic Effect, Viral	Visible morphologic changes in cells infected with viruses. It includes shutdown of cellular RNA and protein synthesis, cell fusion, release of lysosomal enzymes, changes in cell membrane permeability, diffuse changes in intracellular structures, presence of viral inclusion bodies, and chromosomal aberrations. It excludes malignant transformation, which is CELL TRANSFORMATION, VIRAL. Viral cytopathogenic effects provide a valuable method for identifying and classifying the infecting viruses.	Cytopathic Effect, Viral,Viral Cytopathogenic Effect,Cytopathic Effects, Viral,Cytopathogenic Effects, Viral,Effect, Viral Cytopathic,Effect, Viral Cytopathogenic,Effects, Viral Cytopathic,Effects, Viral Cytopathogenic,Viral Cytopathic Effect,Viral Cytopathic Effects,Viral Cytopathogenic Effects
D004217	Distemper Virus, Canine	A species of MORBILLIVIRUS causing distemper in dogs, wolves, foxes, raccoons, and ferrets. Pinnipeds have also been known to contract Canine distemper virus from contact with domestic dogs.	Canine Distemper Virus,Canine Distemper Viruses,Distemper Viruses, Canine
D004285	Dogs	The domestic dog, Canis familiaris, comprising about 400 breeds, of the carnivore family CANIDAE. They are worldwide in distribution and live in association with people. (Walker's Mammals of the World, 5th ed, p1065)	Canis familiaris,Dog