Acta Biologica 12. (1961)

1. szám

Áros, В.—Vigh, В.: Neurosecretory activity of the central and peripheral nervous system in the earthworm ................................................................................................................................... 169 Szabó, I.—Németh, G.: Effect of penicillin of Tetrahymena pyriformis, strain Gl. II. Changes in DNA/RNA ratio............................................................................................................. 187 Montskó, T.—Tigyi, A.—Arnold, I.—Tarján, J.: The effect of the parathyroid on the changes of serum proteins ................................................................................................................ 191 Minker, E. — Koltai, M.: Untersuchungen an isolierten Gastropodenorganen......................... 199 Baranyi, I. B.—Tokodi, I.: Effect of antibiotics on the development of Dugesia lugubris 211 Hámori, J.: Innervation of insect leg muscle....................................................................................... 219 Kulcsár, G. —Benkő, К, —Hernádi, F.—Valu, G. —Kiss, S.: Electron microscopic stu­dies of Streptomyces spores.................................................................................................................. 231 SaláNKI, J.: Interoceptive stimuli in the regulation of rhythmicity and periodic activity in fresh water mussels (Anodonta cygnea)................................................................................ 243 Székely, G.—Szentágothai, J.: Experiments with “model nervous systems”.................... 253 Csaba, G.—Török, L. J.—Török, G.—Ács, T.—Bierbauer, J.—Mold, K. —Horváth, J.: Destabilizing effect of heparin on biological systems..................................................... 271 Balázs, A. — Burg, M.: Quantitative data to the changes of propagation according to age. I. Cocoon production of Dugesia lugubris .................................................................... 287 Balázs, A. —Burg, M.: Quantitative data to the changes of propagation according to age. II. Fertility and number of embryos in Dugesia lugubris........................................... 297 Burch, J. B. — Heard, W. H.: Chromosome numbers of two species of Vallonia (Mollusca, Stylommatophora, Orthurethra)..................................................................................................... 305 BÁCSY, E.—Török, L. J.: Contributions to the regenerative capacity of Dendrocoelum lacteum.......................................................................................................................................................... 31 3

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