The flagellar structure of the flame cell in fish tapeworm (Diphyllobothrium latum)

Summary The flame cell of the fish tapeworm (Diphyllobothrium latum) is investigated. In cross-section the flagella originating from the flame cell are hexagonal, except the incomplete ones facing the tubular wall. The function, as regards this unusual structure, is discussed. The axial filament complexes in one flame cell are arranged in opposite directions to each other. Thus the flame cell flagella seem to show many deviating characteristics as compared with those hitherto described. This investigation is supported by Oskar Öflunds Stifteise.It is a pleasure to acknowledge the skilful technical assistance of Miss Tellervo Huima.     

A simplified technique to measure respiration rates of aerobic heterotrophic populations

A simplified technique to trap respired carbon dioxide in a closed bottle system was developed from the technique introduced by Hobbie & Crawford in 1969. In this technique carbon dioxide was trapped in ethanolamine in a glass cup without the use of chromatographic paper. The results show that there is no need to enlarge the absorption surface with filter paper as practically complete recovery was achieved with ethanolamine alone in the cup.