Polyphenoloxidase activity in healthy maize plants and in those infected by the maize rough dwarf virus (MRDV)

Zusammenfassung Der Wirkungsgrad der Polyphenoloxydase gesunder Maispflanzen blieb während der Gesamtdauer ihres Wachstums praktisch unverändert. Er verdreifachte sich hingegen in jungen Pflanzen, die mit dem Virus der Rauhverzwergung des Maises systematisch infiziert wurden.

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This work was supported in part by a grant from the Agricultural Research Service of the United States Department of Agriculture, under Public Law 480.     

Intracellular inclusions associated with maize mosaic virus infection

Zusammenfassung Die Epidermiszellen von mit Mais-Mosaik-Virus infizierten Maisblättern enthalten runde oder längliche Einschlusskörper, welche meist dem Kern anhaften oder nahe bei diesem liegen. Sie erscheinen nach Giemsa-Färbung rosa bis purpurn gefärbt. Die Abmessungen der länglichen Einschlüsse betragen 3,0–4,6 · 14–26, der Durchmesser der rundlichen 2,0–7,7.     

Behavior of some microorganisms cultivated in the presence of irradiated maize starch]

The bactericidal effect of water soluble radiolysis products of Maize starch on Escherichia coli cultures declines when the initial population grows. This toxicity varies with the culture environment and the bacterial species: Bacillus subtilis, Lactobacillus plantarum, Streptococcus faecalis, Enterobacter sp. Moreover, for the eucaryote cell Saccharomyces cerevisiae, wild strain or muting "small colonies", only the generating time is altered by the active parts of radiolysis products. The results are analysed with regard to the hypothesis that the hydrogen peroxide is responsible for this toxicity.     

Changes in photoelectron transport of chloroplasts isolated from dark stressed leaves of maize seedlings

Summary Transfer of light-grown maize seedlings to dark causes a loss in the contents of chlorophyll, protein and RNA of leaves, and a decline in DCPIP photoreduction by isolated chloroplasts. The loss in DCPIP-Hill reaction is attributed to the dark stress-induced damage of O₂ evolving system of thylakoid membranes.Acknowledgment. We thank Prof. M.C. Dash, School of Life Sciences, for encouragement and providing the facilities.     

Changes in photoelectron transport of chloroplasts isolated from dark stressed leaves of maize seedlings.

Transfer of light-grown maize seedlings to dark causes a loss in the the contents of chlorophyll, protein and RNA of leaves, and a decline in DCPIP photoreduction by isolated chloroplasts. The loss in DCPIP-Hill reaction is attributed to the dark stress-induced damage of O2 evolving system of thylakoid membranes.     

Response of maize to different inoculum densities of vesicular arbuscular mycorrhizal endophytes

Summary The effect of the inoculum density of vesicular arbuscular mycorrhizal endophytes on growth and development in maize was investigated in sterilized soil under glass-house conditions. Mycorrhizal plants grew robust and produced three times more dry weight than non-mycorrhizal plants. 40 or more endophytes per plant produced the highest mycorrhizal association and the maximum growth in maize. The uninoculated plants exhibited the symptoms of chlorosis.     

Accumulation of 2,3,7,8-tetrachlorodibenzo-p-dioxin from soil and nutrient solution by bean and maize plants

Summary Maize and bean plants grown on soil polluted with³H-2,3,7,8-tetrachlorodibenzo-p-dioxin (³H-TCDD) accumulated the toxin in the aerial parts progressively with the time and with the soil contamination. Plants in hydroponic solution polluted with³H-TCDD accumulated the toxin in the aerial parts in the light and not in the dark; the concentration of TCDD accumulated was not proportional to the surface area of plant organs; the distribution of³H-TCDD in the leaves suggested that TCDD was translocated through the vessels to the aerial parts by the transpiration stream.     

Formation of proviruses in acute infection in vitro and in vivo

Summary Formation of DNA proviruses of RNA viruses, Sendai and Newcastle disease, was studied. DNA provirus of NDV was shown to be formed in mouse L-cells and Sendai DNA provirus in Ehrlich ascites carcinoma cells within 2–3 days post infection.     

New intermediates in phaeomelanogenesis in vitro

Riassunto Mediante esperimenti in vitro, è stato accertato che i primi stadi della biosintesi delle feomelanine conducono alla formazione di derivati diidrobenzotiazinici, ai quali sono state assegnate le strutture III e IV.

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This investigation was supported by a grant from the Laboratorio di Chimica e Fisica per lo Studio delle Molecole di Interesse Biologico del C.N.R., Napoli.     

Periodicity in body temperature in man

Summary Body temperatures and self-assessed mood scales were recorded for 7 weeks or more by male volunteers. Auto-correlations of temperatures from the 21 subjects show evidence of a significant peak at the 20-day-interval. The self-assessed measure of Alertness (from 18 of them) also shows some evidence of rhythmicity, at the 22-day-period.     

Hairiness in wool in relation to blood potassium types in Marwari sheep

Zusammenfassung Schafe mit geringem Kaliumgehalt im Blut haben an mehreren Körperstellen weniger markhaltige Haare als Tiere mit höherem K-Gehalt.