younger ones; 2. leaf regeneration following bipartition of primordium in different planes; 



3. apical dominance due to young expanding leaves; effect of culture conditions, cytological 



changes. Gleditsia triacanthos (Leguminosae) 

 b Determination on flower bilaterality (microsurgical method). Pisum sativum (Leguminosae) 

 NEW, D. A. T. Ph.D. -- Marshall Lab., Dept. of Physiol., Univ. of Cambridge, Downing St., 



CAMBRIDGE CB2 3EG, England 1SDB 



NEWTH, D. R. Ph.D., Prof. - Dept. of Zool., Univ. of Glasgow, GLASGOW G12 8QC, Scotland, 



U.K. ISDB 



a Properties of primordial germ cells. Xenopus laevis (Anura) 

 b Transplantation immunobiology. Xenopus laevis (Anura) 

 NEYFAKH, A. A. Dr.biol.sc, Prof. - Lab. of Biochem. Embryol., Inst, of Developm. Biol., Acad, of 



Sci. of the USSR, Vavilov St. 26, MOSCOW 117334, U.S.S.R. 

 NICOLET, G. D.Sc. - Lab. d'Embryol. Exper., Inst. d'Histol., Univ. de Geneve, 20 rue de l'Ecole de 



Medecine, 1211 GENEVE 4, Switzerland ISDB 



a Studies on the fate of the different parts of the primitive streak with the help of grafts labelled 



with tritiated thymidine. Gallus domesticus (Aves) 

 b Investigations of the primary induction process with the help of labelled precursors. Gallus 



domesticus (Aves) 

 c Role of Hensen's node in somitic differentiation. Gallus domesticus (Aves) 



d Subcellular changes during early morphogenesis. Gallus domesticus (Aves) (with J. GALLERA) 

 NICOTRA, Miss A. Dr.biol. - 1st. di Zool. 'Federico Raffaele', Viale delEUniversita 32, 00161 



ROMA (7), Italy 

 a Interactions between mitochondrial transcription and early embryonic differentiation. Para- 



centrotus lividus (Echinoidea) 

 b Nuclear protein changes during spermatogenesis. Same species as a (with E. De MATTHAEIS) 

 NIE, C. J. van D.V.M. - Lab. of Anat. and Embryol., Free Univ., v.d. Boechorstst. 7, AMSTERDAM, 



Buitenveldert, Netherlands 

 a Ontogenetic malformations of the heart. Sus scrofa, Bos taurus (Artiodactyla) 

 a Pathological development of heart and vessels. Same species as a 

 c Pathological development of bone. Sus scrofa (Artiodactyla) 

 d Neonatal circulation. Sus domesticus (Artiodactyla) 

 e Teratology. (Mammalia), Homo sapiens (Primates) 

 f Development of the subneural apparatus. Rattus spec. (Rodentia), Oryctolagus cuniculus 



(Lagomorpha) 

 g Regeneration of terminal nerves and motor end plates. Same species as f 

 NIELSEN, CI. Dr.phil. - Marine Biol. Lab., Univ. of Copenhagen, Strandpromenaden, 3000 



HELSING0R, Denmark 

 a Life histories; comparison with Ectoprocts; phylogenetic implications. Loxosoma spec, 



Loxosomella spec, Pedicellina spec, Barentsia spec. (Endoprocta), Alcyonidium spec, Flustrel- 



lidra spec. (Ectoprocta) 

 b Ciliary mechanisms of adults and larvae. Loxosoma spec, Loxosomella spec, Pedicellina spec, 



Barentsia spec. (Endoprocta), Alcyonidium spec, Electra spec. (Ectoprocta) 

 NIEUWKOOP, P. D. Phil.Dr., Prof. - Hubrecht Lab. (Intern. Embryol. Inst.), Uppsalalaan 1, 



Universiteitscentrum 'De Uithof , UTRECHT, Netherlands ISDB 



a The induction of the mesoderm and its cranio-caudal and dorso-ventral organization. Amby stoma 



mexicanum, Triturus alpestris (Urodela) (with E. C. BOTERENBROOD) 

 b The origin of the dorso-ventral polarity of the egg. Discoglossus pictus, Xenopus laevis (Anura) 



(with E. C. BOTERENBROOD, K. HARA, and G. A. UBBELS) 

 NIGON, V. Dr.es Sci., Prof. - Sect, de Biol. Gener. et Appl., Univ.. de Lyon I, 43 Bd. du 



11 Novembre 1918, 69621 VILLEURBANNE, France 

 a Metabolisme dans les diverses phases de revolution. Euglena gracilis (Euglenophyceae) 

 b Differenciation des erythrocytes. Gallus domesticus (Aves) 

 NIIKAWA, N. M.D. - Lab. of Embryol. and Cytogenet., Univ. Clinic of Gynecol, and Obstet., 



Geneva Univ., 20 rue Alcide-Jentzer, 1211 GENEVE 4, Switzerland 

 a Oral contraceptives and chromosomal abnormalities in spontaneous abortions. Homo sapiens 



(Primates) 

 b Phenotype and unusual chromosome abnormalities in abortions. Homo sapiens (Primates) 

 c Determination of parental contribution of extra chromosomes. Homo sapiens (Primates) 

 NIJWEIDE, P. J. Drs. - Lab. for Cell Biol, and Histol., State Univ., Rijnsburgerweg 10, LEIDEN, 



Netherlands 

 a Calcium and strontium metabolism of embryonic calvarium periost. Gallus domesticus (Aves), 



Rattus spec. (Rodentia) 

 NIKITIN, N. S. Dr. - Dept. of Embryol., Leningrad State Univ., Mendeleevsky St.5, 199164 



LENINGRAD, U.S.S.R. 

 a Morphogenetic potentiality of somatic cells. Ephydatia fluviatilis (Porifera) 

 b Development of culture media for dissociated cells. (Porifera) 

 NIKITINA, Mrs. L. A. Cand.biol.sci. - Inst, of Developm. Biol., Acad, of Sci. of the U.S.S.R., 



Vavilov St. 26, MOSCOW 1 17334, U.S.S.R. 

 a Analysis of developmental potencies of nuclei in sequential stages of oogenesis by means of their 



transplantation into enucleated eggs. (Acipenseridae, Chondrostei; Amphibia) 

 NOACK, W. Dr. - Anat. Inst, der Freien Univ. Berlin, Kon.-Luise-Str. 15, 1 BERLIN 33, B.R.D. 



(Germany) 

 a Development and experimental teratology of lung and muscles. Rattus spec, Mus musculus 

 (Rodentia) 



73 



