Zur Kenntnis desSaruma Henryi Oliv

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Ultrastructural differences between the myelin sheaths of peripheral nerve fibres and CNS white matter

Summary Electron microscopic studies of peripheral nerves and spinal cord white matter of adult mice, as prepared by the freeze-etching method, show distinct differences in the periodicity of the myelin lamellae as well as of the ultrastructural lamellar pattern. A periodicity of 185 Å is to be determined for peripheral myelin whereas it is 160 Å in the myelin of central origin.In contrast to the appearance in the peripheral myelin the lamellar structure in the central myelin sheath is less pronounced and tends towards a fundamental repeating unit of 80 Å.This work was supported by the Swiss National Foundation (Nr. 4065).     

Bemerkungen zu den Lehren vom Knochenschwund

Ohne ZusammenfassungDieser Vortrag war für die (unter dem Druck der Verhältnisse abgesagte) Gesellschaftstagung vom 4. und 5. IX. d. J. zu München bestimmt.     

Bodenbewohnende Schädlinge und Seitenwurzelfäule der Zuckerrübe in Abhängigkeit von der Rotation – Ergebnisse eines Fruchtfolgeversuches

Soil inhabiting pests and rot of feeding roots of sugar beet depending on rotation - Results of a long-term trial Over a period of 17 years a trial was carried out with sugar beet, cereals and oilseed rape in different crop rotations on a field near Göttingen (Lower Saxony). The frequency of sugar beet in the rotation was 17, 25, 33 and 67 %. In absence of beet nematodes, root and sugar yield of the beet decreased after repeated growing of sugar beet in short rotations compared to variants with long rotations. Sugar content and beet quality were only slightly influenced. By applying a bioassay (BW-Test) with young beet plants in the greenhouse it was shown that increasing infections on the tips of rootlets of the beet plants were the cause for decreasing beet yield in close rotations. Mortality of young beet plants and progress of infection in the test indicated roughly the quantity of pathogenic fungi in the soil. In the roots of the bait platits the parasitic fungus Aphanomyces cochlioides predominated. Rate of infection and yield reduction in the field were decisively influenced by weather conditions. Differences in yield between sugar beet grown in a three-year and a four-year rotation, however, were not significant. An occurrence of beet pests depending on crop rotation was stated only for Atomaria linearis and this only in a few years.     

Bemerkungen überAsplenium Forsteri Sadl

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Zur Flora von Böhmen

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