LENZ, W. Dr.med., Prof. — Inst, fur Humangenet. der Univ., Vesaliusweg 12/14, 44 



MONSTER/Westf., W.Germany 

 a Analysis of thalidomide embryopathy in relation to time of intake. Homo sapiens (Pri- 

 mates) 

 LEONARD. A. Ph.D. — Lab. de Genet., Dept. de Radiobiol., Centre d'Etude de I'Energie 



Nucleaire, MOL, Belgium 

 a Study of chromosome aberrations induced by X-irradiation in u t e r o. (Mammalia) 

 LEONE, V. M.D. — Cat. di Embriol. e Morfol. Sperim., Univ. di Milano, Via Celoria 10, 



20133 MILANO, Italy • 



LEONIENI. ]. Dr. — Dept. of Histol. and Embryol., Acad, of Med., ul.Narutowicza 60, 



fLODZ, Poland 

 a Comparative histological, histochemical, and electron microscopical studies on the devel- 

 opment, structure, and function of the subcommissural organ. (Mammalia). Homo sapiens 



(Primates) 

 LEOPOLD, R. A. Ph.D. — USDA Mctab. & Radiat. Research Lab., State Univ. Station. 



FARGO, N.D. 58103, U.S.A. 

 a Cytochemistry of developing reproductive structures. Musca domestica (Diptera) 

 b In vivo and in vitro investigation of cuticle deposition during leg regeneration. 



Leucophaea maderae (Dicfyoptera) 

 LEPORI, N. G. Prof. — 1st. di Zool., Fac. di S.M.F.N., Univ. di Sassari, Via Murroni 25, 



07100 SASSARI, Italy 

 a Research on the origin of the asymmetry of the female gonad (blastoderm in vitro). 



(Aves) 

 h Research on the origin of asymmetrical heart development (blastoderm in vitro). 



Gallus spec, Anas spec. (Aves) 

 c Research on the inductor of the uro-genital organs. Gallus spec. (Aves), Rana spec. 



Trituras spec. (Amphibia) 

 LE ROUX, J. M. W. Dr.med.vet. — Dept. of Anat.. Fac. of Vet. Sci., Univ. of Pretoria, 



P.O. ONDERSTEPOORT, South Africa 

 LESH, Miss G. E. Ph.D. — Dept. of Biol. Sci., State Univ. of New York at Albany, 



ALBANY, N.Y. 12203, U.S.A. 

 a Investigations of neoblast movement and cell differentiation. (Hydrozoa) 

 b Studies of polarity and cell differentiation. (Polychaeta) 

 LESSEPS, R. J., S.J. Ph.D. — Dept. of Biol. Sci., Loyola Univ., NEW ORLEANS, La. 



70118. U.S.A. 

 a Ultrastructure of cell surface (embryonic liver, heart, neural retina, limb bud). Gallus 



domesficus (Aves) 

 LEVAK (SVAJGER). Mrs. B. D.Sc — Inst, of Biol., Univ. of Zagreb, Salata, ZAGREB. 



Yugoslavia 

 a Investigation of early differentiation; transplantation, in vitro culture. Rattus nor' 



vegicus (Rodentia) (in collaboration with N. SKREB and A. gVAJGER) 

 b Investigation on developmental capacities of tissues of the chorioallantoic membrane. Gallus 



domesticus (Aves) (in collaboration with N. SKREB and A. SVAJGER) 

 LEVENSON, G. E. Ph.D., D.D.S. — Dept. of Biol., Grad. School of Arts and Sci.; Lab. 



of Histol. and Embryol., School of Dental Med., Univ. of Pennsylvania, PHILADEL- 

 PHIA, Pa. 19104, U.S.A. 

 a Comparison of three types of embryonic cartilage when grown as monolayer cultures. 



Gallus domesficus (Aves) 

 b Effect of ascorbic acid in medium on growth and differentiation of embryonic cartilage in 



monolayer culture. Gallus domesticus (Aves) 

 c Histogenesis of embryonic liver: cell culture techniques, effects of metabolites on differen- 

 tiation. Gallus domesticus (Aves) 

 LEVER. W. E. — Biol. Div., Oak Ridge Natl. Lab.. P.O. Box Y. OAK RIDGE. Tenn. 



37830, U.S.A. 

 a Temporal and spatial patterns of cell replication and nuclear degeneration during lens 



development and growth; computer analysis of mathematical models. Gallus domesticus 



(Aves) (in collaboration with S. P. MODAK) 

 LEVI, C. Dr.es Sci., Prof. — Lab. de Biol. Invert. Marins. Museum Natl. d'Hist. Nat.. 57 rue 



Cuvier, PARIS Ve, France 

 a Descriptive and experimental embryology, morphogenesis, cytology (electron microscopy). 



(Pori[era) 

 LEVI-MONTALCINI, Miss R. M.D., Prof. — Dept. of Biol., Washington Univ., ST. 



LOUIS. Mo. 63130, U.S.A. • 



a Study of action of the nerve growth factor and related problems in experimental neuro- 

 biology 

 b Experimental study of the structural organization and interconnection between different 



brain parts and ganglia. Periplaneta americana (Dictyopteca) 

 c A technique to grow nerve and glia cells from explants of brain and ganglia in order to 



study their growth and differentiation under different experimental conditions. Periplaneta 



americana (Dictyoptera) 



105 



