Zaaijer-Zwi 



a. Cartilage and bone formation in vitro. Gallus gallus (Aves), Homo 

 sapiens (Primates) 



b. Muscle fibre development. Homo sapiens (Primates) 



c. Toe development. Homo sapiens (Primates) 



ZAHND. J. P. Dr. en Med., Lie. es Sci. — Inst. d'Embryol., Fac. de Med., 

 1 Place de l'Hopital, STRASBOURG, France 



a. Developpement du squelette. Facteurs influencant le developpement. 

 Anas spec. (Aves) 



b. Formation de l'oeuf. (Pisces, Reptilia) 



c. Recherches sur le determinisme de la symetrie bilaterale. (Pisces, Reptilia) 

 ZAWISCH, Miss C. Dr., Prof. — Histol.-embryol. Inst, der Univ., Univer- 



sitatsplatz 4, GRAZ, Oesterreich 

 (no embyological work in progress) 

 ZELENA, Mr. J. MUDr., Cand.Med.Sci. (= M.D.) — Inst, of Physiol., 

 Czechoslovak Acad, of Sci., Na cvicisti 2, PRAHA 6, Czechoslovakia 



a. Effect of innervation on the development of muscle end-organs. Orycto- 

 lagus cuniculus (Lagomorpha) , Rattus norvegicus (Rodentia) 



b. Development of reinnervated muscles devoid of proprioceptors after 

 crushing the nerve in early ontogenesis. Rattus norvegicus (Rodentia) 



ZENKER, W. Dr.med. — Anat. Inst., Wahringerstr. 13, WIEN 9, Oester- 

 reich 



ZEUTHEN, E. Dr.phil., M.I. I.E. — Biol. Inst, of the Carlsberg Founda- 

 tion, 16, Tagensvej, COPENHAGEN N., Denmark 



a. Study with Cartesian divers of mitotic rhythm in oxygen uptake and in 

 carbon dioxyde output during cleavage period. (Echinoidea, Ciliata) 



b. Studies on the biochemistry and physiology of synchronized cell systems. 

 Tetrahymena pyriformis (Holotricha, Ciliata) (in collaboration with K. 

 HAMBURGER and P. PLESNER) 



c. Studies on growth and division injure cultures. Acanthamoeba spec. 

 (Amoebidae) (in collaboration with L. RASMUSSEN) 



ZIMMERMAN, A. A. M.I.I.E., Prof. — Dept. of Anat., Coll. of Med., Bay- 

 lor Univ., HOUSTON, Texas, U.S.A. 



ZOTIN, A. I. Cand.Biol.Sci. — Inst, of Animal Morphol. of the Acad, of Sci. 

 of the U.S.S.R., Lenin Avenue 33, MOSCOW V-71, U.S.S.R. 

 a. Study of water metabolism in embryonic development. Huso huso, Aci- 

 penser guldenst'adti, A. stellatus (Acipenseriformes, Chondrostei) , Salmo 

 salar, Coregonus lavaretus (Clupeiformes, Teleostei) 



ZUCKERMAN, S. M.A., M.D., D.Sc, M.R.C.S., L.R.C.P., F.R.S., Prof. 

 — Dept of Anat., The Med. School, Birmingham Univ., Edgbaston, BIR- 

 MINGHAM 1, England 

 (no embryological work in progress) 



ZWAN, A. van der Med.cand. — Anat.-Embryol. Lab., Free Calvinistic 

 Univ., Pr. Hendriklaan 27, AMSTERDAM Z., Holland 



f ZWEIBAUM, J. Dr., Prof . — Zaklad Histol. i Embriol., Ak. Med., ul. 

 Chahibinskiego 5, WARSZAWA, Poland 

 (deceased) 



ZWILLING, E. Ph.D., M.I. I.E. — Dept. of Biol., Brandeis Univ., WALT- 

 HAM 54, Mass. U.S.A. 



a. Disaggregation and reaggregation of early embryos. Effects on differen- 

 tiation. Gallus domesticus (Aves) 



b. Culture behaviour of early embryonic tissues. Gallus domesticus (Aves) 



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