Inhibitory effect of some heteropolyanions on potato virus X

Summary Heteropolyanions like 12-tungstozincic acid (i.i.), potassium 13-vanadomanganate (i.v.), potassium 13-vanadonickelate (i.v.) and sodium tungstoborate produced an inhibitory effect on potato virus X. Amongst these, tungstozincic acid was found to be the most potent.The authors are thankful to Prof. R. P. Rastogi, Head of the Chemistry Department, University of Gorakhpur for providing necessary facilities. The financial support by Council of Science and Technology, U.P., Lucknow is gratefully acknowledged.     

The effect of potato virus X on the nitrogenous constituents of potatoes

Summary Infection with potato virus X (PVX) increased the total nitrogen and non-protein nitrogen contents of Katahdin tubers. Protein nitrogen remained unchanged, but a 22% increase in free amino acid content accompanied infection. No differences were observed in the number or composition of protein fractions in infected tubers.     

Effect of actinomycin D on the multiplication of the infectious pancreatic necrosis virus of trout

Résumé La croissance du virus de la nécrose infectieuse pancréatique dans les cultures des cellules de la truite est arrêtée dans une proportion de plus de 99% par l'actinomycine D, à toutes les concentrations essayées. La réaction sensible à l'actinomycine a lieu dans les premières phases du processus infectieux.     

Serological studies on tomato mosaic virus

Résumé La souche du virus en mosaique de la tomate et celle du virus en mosaique du tabac se sont trouvées alliées comme l'ont montré les résultats des expériences de précipitation et d'aglutination.     

Quaternary ammonium bases in the tomato plant

Zusammenfassung Im Hinblick auf die Untersuchung der Wirkung von Chlorcholinchlorid im Stoffwechsel der Quartärammoniumverbindungen in Pflanzen wurden deren natürlich vorhandene Substanzen in wässrigen Extrakten von Tomatenpflanzen papierchromatographisch in vier Lösungsmitteln untersucht.In den Extrakten überwog eine Substanz, die sich von Cholin chromatographisch unterscheidet, die aber dieselbe Farbreaktion mit einem modifizierten Dragendorffschen Reagens gibt. Während der Papierelektrophorese bei pH 6 wird diese Substanz in zwei andere umgewandelt. Eine von diesen entspricht chromatographisch Cholin. Keine von den unbekannten Substanzen aber scheint ein phosphoryliertes Derivat von Cholin zu sein.     

Effect of daminozide on tomato fruit ripening

Summary Fruits of tomato (Lycopersicon esculentum Mill. cv. Fireball) were harvested 32 and 37 days after anthesis and dipped for 30 min in 10,000 ppm daminozide. Ripening of treated fruits, as manifested by an advancement in ethylene production and the respiratory climacteric, was accelerated by up to 7 days over control fruit.Acknowledgment. This investigation was supported by Agriculture Canada and the Ontario Ministry of Agriculture and Food.     

The inhibitory effect of 6-azauracil riboside on the multiplication of vaccinia virus

Zusammenfassung Die Hemmwirkung von 6-Azauracilribosid auf die Vermehrung des Vaccina-Virus in Gewebekulturen wurde festgestellt. Die Substanz blieb gegen andere Viren (Influenza A, NDV, EEE) wirkungslos.     

Studies on yellow mosaic disease of soybean. I. Effect of virus infection on plant pigments

Zusammenfassung Es wird gezeigt, dass die Abnahme des Chlorophyllgehalts in den von der gelben Mosaik-Krankheit befallenen Soyabohnenblättern auf eine Stimulierung der Chlorophyllase-Aktivität im Frühstadium der Erkrankung zurückzuführen ist.     

RNA fragments, in vivo inhibitors of Shope fibroma and vaccinia virus multiplication]

RNA-fragments rich in purine nucleotides and resulting from degradation of ribosomal RNA from E. coli M 500 Sho-R with pancreatic RNase exhibit only in vivo an inhibitory effect on Shope fibroma and vaccinia virus multiplication.     

Inhibition of virus multiplication and alteration of cyclic AMP level in cell cultures by flavonoids

The inhibitory effect of four flavonoid compounds on virus multiplication and their influence on the intracellular cyclic AMP (cAMP) level were studied in cell cultures. Quercetin and quercitrin reduced the yields of Human (alpha) herpesvirus 1 (HSV-1) and Suid (alpha) herpesvirus 1 (pseudorabies virus), but hesperidin and rutin had no effect. Further, quercetin and quercitrin elevated the intracellular level of cAMP, whereas hesperidin and rutin did not alter the cAMP level. Both antiviral activity and cAMP-enhancing effect were dependent on the concentrations of the flavonoids, and these effects turned out to be parallel. This study suggests that a relation exists between the antiviral effect and the cAMP-enhancing activity of flavonoids.     

Inhibition of virus multiplication and alteration of cyclic AMP level in cell cultures by flavonoids

Summary The inhibitory effect of four flavonoid compounds on virus multiplication and their influence on the intracellular cyclic AMP (cAMP) level were studied in cell cultures. Quercetin and quercitrin reduced the yields ofHuman (alpha) herpesvirus 1 (HSV-1) andSuid (alpha) herpesvirus 1 (pseudorabies virus), but hesperidin and rutin had no effect. Further, quercetin and quercitrin elevated the intracellular level of cAMP, whereas hesperidin and rutin did not alter the cAMP level. Both antiviral activity and cAMP-enhancing effect were dependent on the concentrations of the flavonoids, and these effects turned out to be parallel.This study suggests that a relation exists between the antiviral effect and the cAMP-enhancing activity of flavonoids.