Effect of Nitrous Acid on Tobacco Mosaic Virus: Mutation or Selection?

Nature ◽  
1959 ◽  
Vol 184 (4688) ◽  
pp. BA27-BA29 ◽  
Author(s):  
F. C. BAWDEN
Keyword(s):  
Tobacco Mosaic Virus ◽  
Mosaic Virus ◽  
Nitrous Acid

Inactivation of Naturally Occurring Variants of Tobacco Mosaic Virus with Nitrous Acid

Nature ◽  
1962 ◽  
Vol 195 (4845) ◽  
pp. 1029-1030 ◽  
Author(s):  
IRVING RAPPAPORT ◽  
S. G. WILDMAN
Keyword(s):  
Tobacco Mosaic Virus ◽  
Mosaic Virus ◽  
Nitrous Acid ◽  
Naturally Occurring

Die Reaktionsweise der Desoxyribonucleinsäure mit salpetriger Säure

1960 ◽  
Vol 15 (5) ◽  
pp. 298-304 ◽  
Author(s):  
Heinz Schuster
Keyword(s):  
Hydrogen Bonds ◽  
Tobacco Mosaic Virus ◽  
Mosaic Virus ◽  
Ribonucleic Acid ◽  
Nitrous Acid ◽  
Deoxyribonucleic Acid ◽  
Ion Concentration ◽  
Different Sources

The reaction of nitrous acid with deoxyribonucleic acid (DNA) isolated from different sources was investigated. Contrary to the results found with ribonucleic acid from tobacco mosaic virus, in which all the aminobases are deaminated with about the same velocity, in native DNA the aminobases react with very different reaction velocities. In this case adenine and cytosine react much slower than does the guanine, also the ratios of velocities of the bases vary with the H-ion concentration of the solution. These results confirm the existence of hydrogen bonds involving only the aminogroups of adenine and cytosine in native DNA, whereas in denaturated DNA the aminogroups of all the bases are exposed to nitrous acid deamination.

Die primäre Proteinstruktur Temperatur-sensitiver Mutanten des Tabakmosaikvirus

1965 ◽  
Vol 20 (12) ◽  
pp. 1235-1249 ◽  
Author(s):  
B. Wittmann-Liebold ◽  
J. Jauregui-Adell ◽  
H. G. WlTtmann
Keyword(s):  
Protein Structure ◽  
Spatial Structure ◽  
Tobacco Mosaic Virus ◽  
Mosaic Virus ◽  
Nitrous Acid ◽  
Preceding Paper ◽  
Temperature Sensitive ◽  
Temperature Sensitive Mutants

The protein structure of temperature-sensitive mutants of tobacco mosaic virus isolated after treatment with nitrous acid has been determined. The results obtained for 15 mutants, presented in this and the preceding paper, are discussed with relation to the spatial structure of the virus rod.

Quantitative Measurements on the Ion Etching of TMV

1973 ◽  
Vol 31 ◽  
pp. 336-337
Author(s):  
Irwin Bendet ◽  
Nabil Rizk
Keyword(s):  
Electron Microscope ◽  
Tobacco Mosaic Virus ◽  
Mosaic Virus ◽  
Ion Current ◽  
Beam Diameter ◽  
Ion Etching ◽  
Preliminary Results ◽  
Quantitative Measurements ◽  
Monitoring Devices

Preliminary results reported last year on the ion etching of tobacco mosaic virus indicated that the diameter of the virus decreased more rapidly at 10KV than at 5KV, perhaps reaching a constant value before disappearing completely.In order to follow the effects of ion etching on TMV more quantitatively we have designed and built a second apparatus (Fig. 1), which incorporates monitoring devices for measuring ion current and vacuum as well as accelerating voltage. In addition, the beam diameter has been increased to approximately 1 cm., so that ten electron microscope grids can be exposed to the beam simultaneously.

Tobacco Mosaic Virus-Infected Tissue

1985 ◽  
Vol 43 ◽  
pp. 510-511
Author(s):  
Egbert W. Henry
Keyword(s):  
Nicotiana Tabacum ◽  
Tobacco Mosaic Virus ◽  
Chlorogenic Acid ◽  
Mosaic Virus ◽  
Host Resistance ◽  
Oxidative Metabolism ◽  
Leaf Tissue ◽  
Vein Clearing ◽  
Basal Septum ◽  
Concentration Levels

Tobacco mosaic virus (TMV) infection has been studied in several investigations of Nicotiana tabacum leaf tissue. Earlier studies have suggested that TMV infection does not have precise infective selectivity vs. specific types of tissues. Also, such tissue conditions as vein banding, vein clearing, liquification and suberization may result from causes other than direct TMV infection. At the present time, it is thought that the plasmodesmata, ectodesmata and perhaps the plasmodesmata of the basal septum may represent the actual or more precise sites of TMV infection.TMV infection has been implicated in elevated levels of oxidative metabolism; also, TMV infection may have a major role in host resistance vs. concentration levels of phenolic-type enzymes. Therefore, enzymes such as polyphenol oxidase, peroxidase and phenylalamine ammonia-lyase may show an increase in activity in response to TMV infection. It has been reported that TMV infection may cause a decrease in o-dihydric phenols (chlorogenic acid) in some tissues.

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