Nedvidek-Nik 



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

 NEEDHAM, J. Dr., F.R.S., F.I.I.E., Prof. — Gonville & Caius Coll., CAM- 

 BRIDGE, England 

 NEOGY, R. K. Dr. — Chittaranjan Nat. Cancer Res. Center, 37 S. P. 

 MOOKERJEE Road, CALCUTTA 26, India 

 a. Effects of -SH and SH-inhibitors on development. (Amphibia), Gallus 

 spec. (Aves) (in collaboration with S. K. BRAHMA) 

 NEULAT, Miss M. M. — Lab. de Zool. exper., Fac. des Sci., 16 Quai CI. ' 

 Bernard, LYON, France 

 a. Metabolisme des acides nucleiques au cours de la metamorphose. Droso- 

 phila melanogaster, Bombyx mod, Galleria mellonella (Insecta) 

 NEW, D. A. T. M.A., Ph.D. — Strangeway's Research Lab., Wort's Cause- 

 way, CAMBRIDGE, England 



a. Morphogenesis of skin in tissue culture. (Aves; Mammalia) 



b. Development of organ perfusion techniques. (Aves; Mammalia) 

 NEWTH, D. R. B.Sc., Ph.D., M.I.I.E., Prof. — Dept. of Biol, as Applied 



to Med., Middlesex Hosp. Med. School, Cleveland St., LONDON W. 1, 

 England 



a. Regeneration of defective organs. (Amphibia) 



b. Morphogenetic effects of homologous DNA administered to eggs and 

 embryos. Siredon mexicanum, Xenopus spp. (Amphibia) 



NEYFAKH A. A. 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. Nucleo-cytoplasmic interaction in development: the role of the nucleus in 



biochemical differentiation. Misgurnus fossilis (Teleostei) 

 NIAZI, I. A. B.Sc, M.Sc, Ph.D. — Dept. of Zool., Univ. of Toronto, 



TORONTO 5, Ont, Canada 

 a. Histological studies of regeneration. Ammocoetes larvae (Petromyzonti- 



dae, Cyclostomata) , (Anura) 

 NIEUWKOOP, P. D. Phil.Dr., F.I.I.E., Prof. — Hubrecht Lab., Intern. 



Embryol. Inst., Janskerkhof 2, UTRECHT, Netherlands 



a. Analysis of neural competence of the ectoderm with various techniques. 

 Ambystoma mexicanum (Urodela) 



b. Qualitative and quantitative analysis of the propagation of inductive ac- 

 tions through competent ectoderm, a.o. with time-lapse micro-photogra- 

 phy. Ambystoma mexicanum (Urodela) 



c. Pattern formation in artificially activated ectoderm. Ambystoma puncta- 

 turn, A. mexicanum, Rana pipiens (Amphibia) 



NICHOLAS, J. S. Ph.D., F.I.I. E., Prof. — Dept. of Zool. (Osborn Zool. 

 Lab.), Yale Univ., NEW HAVEN 11, Conn., U.S.A. 



a. Studies on the egg. Mus norvegicus (Rodentia) 



b. Determination times of tissues and organs. Mus norvegicus (Rodentia) 



c. Factors underlying embryonic form. 



d. Development of nucleic acids in embryos. (Amphibia), Mus norvegicus 

 (Rodentia) 



e. Development of acid phosphatase. (Amphibia), Mus norvegicus (Roden- 

 tia) 



f. Centrifugation and transplantation of eggs. Mus norvegicus (Rodentia) 



g. Culture of eggs and embryos. Mus norvegicus (Rodentia) 



h. Heteroplastic grafting. Gallus gallus (Aves) (host), Mus norvegicus 

 (Rodentia) (donor) 



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