Fritz Runge

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Vitamin A is very sensitive to chemical degradation caused by oxygen, light, heat, and other stress factors. If light and oxygen are excluded, the dominant degradation reaction for vitamin A derivatives is heat-induced formation of kitols, that is, dimers or higher oligomers. In this study vitamin A esters were used as model systems to evaluate(More)
The vegetation of a permanent quadrat situated in a Northwest German Calluno-Genistetum typicum community has been analysed every year from 1955 to 1959 (cf. Vegetatio X, p. s53–56, 1961) and again from 1960 to 1964. In the winter of 1955/56, when there were temperatures of −27° and an incomplete snow-cover, Calluna vulgaris had died in large amount.(More)
I n d e r t r o c k e n e n H e i d e ( C a l l u n o G e n i s t e t u m t y p i c u m ) d e s im Kreise Tecklenburg gelegenen Naturschutzgebietes ,,Heiliges Meer" stellte sich, genau wie in den weitaus meisten Zwergstrauchheiden Nor& westdeutschlands, innerhalb der letzten Jahrzehnte ein starker Jungwuchs aus Eichen (Quercus robur), Birken (Betula(More)
Das Dürrejahr 1959 verursachte in einem Melico-Fagetum des Drübels bei Brilon erhebliche Schäden an mehreren Buchen. Diese Schäden und die folgende Abholzung der erkrankten Bäume lösten, wie 8jährige Untersuchungen in einem Dauerquadrat ergaben, folgenden Vegetationsyklus aus: Reiner oder fast reiner Buchen-Hochwald — Absterben bzw. Schlag einzelner Buchen(More)
The vegetation of a permanent quadrat situated in a Calluno-Genistetum typicum community has been analysed every year from 1955–1964 (cf. Vegetatio Vol. X, Fasc. 1, 1961 and Vol. XIII, Fasc. 4, 1966) and again from 1965 to 1969. Calluna vulgaris, which from 1955 to 1959 still covered 85–95% of the area, decreased to 30–55%. This was due to disease or(More)
In a Gentiano-Koelerietum of the Beckumer Berge (Westfalen) a permanent quadrat of 3 sq. metres was constructed. Sample plot analyses (see table), noticed during 5 years (1957–1961), gave the following results: Many species, especially the perennials, nearly do not fluctuate in quantity during many years. Some plants continuously decrease or increase in(More)
We report investigations on the percolation of the aqueous phase in water-in-oil microemulsions, comparing systems stabilized by ionic AOT and non-ionic Igepal amphiphiles. First, we briefly review the opposite effect of temperature on the two systems and compare electric conductivity with viscosity data. In the second part, we show that percolation can be(More)
A permanent quadrat of 3 sq metres was laid down in a Gentiano-Koelerietum stand located in the Beckumer mountains (Westphalia) in 1957 (cf.Vegetatio, Vol. XI, 1963, Fasc. 4; 237–40). The relevés made each year from 1957–61 as also from 1962–66 (see table) gave the following results: Many species, especially the perennials, fluctuate little in their(More)
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