Biological and physico-chemical properties of an atypical mutant of tobacco mosaic virus

1973 ◽  
Vol 121 (1) ◽  
pp. 15-34 ◽  
Author(s):  
O. P. Sehgal
Keyword(s):  
Tobacco Mosaic Virus ◽  
Mosaic Virus ◽  
Chemical Properties ◽  
Physico Chemical

THE IDENTITY OF A SEED-BORNE MOSAIC VIRUS OF CHENOPODIUM AMARANTICOLOR AND C. QUINOA

1967 ◽  
Vol 45 (8) ◽  
pp. 1285-1295 ◽  
Author(s):  
Humberto F. Dias ◽  
Howard E. Waterworth
Keyword(s):  
Mosaic Virus ◽  
Environmental Conditions ◽  
Chemical Properties ◽  
Latent Virus ◽  
Mottle Virus ◽  
Chenopodium Amaranticolor ◽  
Physico Chemical ◽  
The Usa ◽  
Systemic Symptoms ◽  
Erratic Behavior

Seedlings of Chenopodium amaranticolor and C. quinoa were found to contain a highly infectious, seed-borne virus that may remain latent. Under certain environmental conditions and following abrasion of the leaves with carborundum and water, infected, symptomless young plants develop visible systemic symptoms. The presence and erratic behavior of the virus in these species can lead to erroneous identification of the causal agent of diseases of other crops. The virus is restricted to the Chenopodiaceae and is similar to Chenopodium mosaic virus (= sowbane mosaic virus) in morphology and in physico-chemical properties. It is serologically related to Chenopodium star mottle virus, to a latent virus isolated from apple in the USA and, by inference, to Chenopodium mosaic virus.

Decoration of specific sites on freeze-fractured membranes

1978 ◽  
Vol 36 (2) ◽  
pp. 140-141
Author(s):  
H. Gross ◽  
H. Moor
Keyword(s):  
Pure Water ◽  
Freeze Fracture ◽  
Chemical Properties ◽  
Surface Forces ◽  
Sulfate Pentahydrate ◽  
Copper Sulfate Pentahydrate ◽  
Physico Chemical ◽  
Water Of Hydration ◽  
Small Container ◽  
Binding Forces

Fracturing under ultrahigh vacuum (UHV, p ≤ 10-9 Torr) produces membrane fracture faces devoid of contamination. Such clean surfaces are a prerequisite foe studies of interactions between condensing molecules is possible and surface forces are unequally distributed, the condensate will accumulate at places with high binding forces; crystallites will arise which may be useful a probes for surface sites with specific physico-chemical properties. Specific “decoration” with crystallites can be achieved nby exposing membrane fracture faces to water vopour. A device was developed which enables the production of pure water vapour and the controlled variation of its partial pressure in an UHV freeze-fracture apparatus (Fig.1a). Under vaccum (≤ 10-3 Torr), small container filled with copper-sulfate-pentahydrate is heated with a heating coil, with the temperature controlled by means of a thermocouple. The water of hydration thereby released enters a storage vessel.

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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