Factors influencing changes in ploidy and nuclear DNA levels in cells from normal, crown-gall and habituated cultures ofHelianthus annuus L. D. N. ButcherA. K. SogekeI. C. Tommerup OriginalPaper Pages: 295 - 308
Observations of the penetration of the phloem in leaves ofNerium oleander (Linn.) by stylets of the aphid,Aphis nerii (B. de F.) C. E. J. BothaR. F. EvertR. D. Walmsley OriginalPaper Pages: 309 - 319
A radioisotopic and morphological study of the uptake of materials into food vacuoles byTetrahymena pyriformis GL-9 T. R. RickettsAngela F. Rappitt OriginalPaper Pages: 321 - 337
Some ultrastructural aspects of spermatogenesis inLycopodium complanatum Zane B. CarothersRobert R. RobbinsDavid L. Haas OriginalPaper Pages: 339 - 350
Multinuclear stages of the life cycle ofAcetabularia mediterranea H. -U. Koop OriginalPaper Pages: 351 - 362
Filament formation in the diatomSkeletonema costatum Harold L. HousleyRaymond W. ScheetzGeorge F. Pessoney OriginalPaper Pages: 363 - 369
Gleichzeitiger Nachweis von phenolarmen und phenolreichen Phasen in den Blattepidermiszellen vonSalix alba L. Birgit Kartusch OriginalPaper Pages: 371 - 379
Evidence for structural units in chloroplast thylakoids Margaret E. van SteveninckR. F. M. van Steveninck OriginalPaper Pages: 381 - 389
The fine structure of the zoospores ofFritschiella tuberosa Iyeng.(Chaetophorineae, Chlorophyceae) with special reference to the flagellar apparatus Michael Melkonian OriginalPaper Pages: 391 - 404
Isolation, culture, and induction of embryogenesis in protoplasts from cell-suspensions ofAtropa belladonna G. GoschY. P. S. BajajJ. Reinert Brief Report Pages: 405 - 410