b Changes in nucleic acids and some other phosphorus fractions of tissues during late 

 embryonic and early postnatal development. I^attus norvegicus (Rodentia) 



NANNEY, D. L. Ph.D., Prof. — Dept. of Zool., Univ. of Illinois, URBANA, 111. 61801, 

 U.S.A. 



a Genetic and developmental studies on cortical variations. Tetrahymena pyriformis (Ciliafa) 



b Regulation of gene action in clonal cultures. Tetrahymena pyriformis (Ciliata) 



NARAIN (GUPTA), Mrs. B. Ph.D. — Dept. of Zool., Univ. of Gorakhpur, GORAKHPUR 

 (U.P.). India 



a In vitro development of the life cycle stages of a parasitic species. Bunostomum tru 

 gonocephalum (Nematoda) 



h Effect of temperature, light (visible and otherwise), and chemicals on in vitro devel- 

 opment of the life cycle stages of some parasites of domesticated animals. (Nematoda) 



NARAYANAN, C. H. Ph.D. — Dept. of Biol., Washington Univ., ST. LOUIS, Mo. 63130, 

 U.S.A. 



a Degenerative changes in the motor column at the lumbosacral level under normal and 

 experimental conditions. Gallus domesticus (Aves) 



b Peripheral-central relationship with reference to the development of certain nuclear centers 

 in the embryonic brain. Coturnix coturnix, Gallus domesticus (Aves) 



c Heterotopic transplantation of spinal cord segments in the embryo and its effect on 

 motility and action pattern of the hind limbs. Gallus domesticus (Aves) 



d Experimental analysis of motility in fetuses. Rattus norvegicus (Rodentia) 



NASH, D. Ph.D. — Dept. of Genet., Univ. of Alberta, EDMONTON, Alta., Canada 



NAVAGIRI, Mrs. S. S. M.S. — Dept. of Anat., Med. Coll., NAGPUR-3, M.S., India 



a Histochemistry of apical ectodermal ridge and the distal developing system of the limb; 

 localization of enzyme responsible for early phase of differentiation. Gallus domesticus 

 (Aves) 



NAVARATNAM, V. Ph.D. — Anat. School, Univ. of Cambridge, Downing St., CAM- 

 BRIDGE CB2 3DY, England 



a Ontogenesis of cholinesterase and mono-amine activity in cardiac innervation. (Mammalia, 

 incl. Homo sapiens) 



h Ultrastructure of the yolk sac. Homo sapiens (Primates) 



NAYLOR, E. Ph.D. — Dept. of Zool., Univ. Coll. of Swansea, Singleton Park, SWAN- 

 SEA, Glamorganshire, Wales, U.K. 



NEBEL, L. A. M.D., Prof. — Dept. of Embryol. and Teratol., Tel-Hashomer Hosp., Tel- 

 Aviv Univ. Med. School, TEL-AVIV, Israel 



a The effect of hypervitaminosis D2 on the formation, differentiation and function of the 

 placenta. Rattus rattus (Rodentia) 



h Structural and functional characteristics of syncytial placenta cells in vitro from 

 normal and pathological pregnancies. Homo sapiens (Primates) 



NEDVIDEK, J. RNDr. — Dept. of Exper. Zool., Charles Univ., Vinicna 7, PRAHA 2, 

 Czechoslovakia 



a Nucleic acids and subcellular particles in oogenesis and early development. (Amphibia) 

 (in collaboration with Mrs. V. VILIMKOVA (HABROVA)) 



b Transplantation of nuclei in relation to nucleic acids. (Amphibia) (in collaboration with 

 F. SLADECEK) 



NEEDHAM, A. E. D.Sc. — Dept. of Zool., Univ. of Oxford. Parks Road, OXFORD OXl 

 3PF, England 



a Beryllium chloride and regeneration. Polycelis nigra (Turbellaria) 



NEEDHAM, J. Dr., Prof. (Emer.) — Gonville and Caius Coll., CAMBRIDGE, Engeland • 



NEMER, M. — The Inst, for Cane. Research, 7701 Burholme Ave., Fox Chase, PHILA- 

 DELPHIA, Pa. 19111, U.S.A. • 



NEMOTO, S. M.Sc. — Embryol. Sect., Dept. of Biol., Tokyo Metropolitan Univ., 2-1-1 

 chome, Fukazawa-machi, Setagaya-ku, TOKYO, 158 Japan 



a Metabolic rhythm during cleavage. (Echinoidea) 



NETZEL, H. E. M. Dr.rer.nat. — Zool. Inst, der Univ., Holderlinstr. 12, D74TOBINGEN, 

 W.Germany 



a Morphogenesis. Centropyxis aculeata. C. discoides (Testacea, Rhizopoda) 



NEUMANN. D. Dr.rer.nat., Prof. — Zool. Inst, der Univ., Weyertal 119, 5 KOLN-Linden- 

 thal, W.Germany 



a Lunar periodicity of metamorphosis. Clunio marinus (Chironomidae, Diptera) 



NEW, D. A. T. Ph.D. — Physiol. Dept.. Univ. of Cambridge, Downing St., CAMBRIDGE 

 CB2 3EG, England • 



a Study of embryos developing in vitro. (Mammalia) 



NEWBURGH, R. W. Ph.D., Prof. — Dept. of Biochem. and Biophys., Fac. of Sci., Oregon 



State Univ., CORVALLIS, Ore. 97331, U.S.A. 

 a Chemical and biochemical changes during development. 



NEWMAN, M. J. M.Phil. — Anat. Dept., The Med. School, University Walk, BRISTOL 



BS8 ITD, England 

 a Electron microscopic and histochemical study of cells involved in morphogenetic mov- 

 ements in primitive streak stages. Rattus norvegicus (Rodentia) 



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