LEBLOND, C. P.; M.D., Ph.D., Prof. - Dept. of Anat., McGill Univ., P.O. Box 6070, Station A, 



MONTREAL, Que. H3C 3G1, Canada 



No work on developmental biology in progress 

 LEE, H. H.; Ph.D., Prof. - Biol. Dept., Univ. of Toledo, 2801 W. Bancroft St., TOLEDO, OH 43606, 



U.S.A. 

 a Characterization of cell surface substances responsible for morphogenesis (testicular cells in 



vitro). Callus domesticus (Aves) 

 b Isolation of steroidogenic cells by sedimentation techniques. Same species as a 

 c Differentiation of oocyte membrane with respect to receptors for a maturation-inducing 



substance, 1-methyladenine. (Asteroidca; Echinoidea) 

 d Intcrmediatc(s) in the cytosol fraction after hormonal stimulation responsible for fertilization 



and embryogenesis. (Asteroidea) 

 e Membrane reactions in oocyte maturation and in fertiUzation. (Echinoidea) 

 LEE, K. H.; M.D. - Dept. of Obstet. and Gynecol., Queen Mary Hosp., Univ. of Hong Kong, Hospital 



Rd., HONG KONG 

 LEESON, C. R.; M.D., Prof. - Dept. of Anat., Coll of Med., Univ. of Missouri, COLUMBIA, 



MO 65201, U.S.A. 

 a Postnatal development of the gastrointestinal tract and associated glands, and of the male 



reproductive tract. Didelphis virginiana (Marsupialia) 

 LEGNAME, A. IL; Dr.Biochem., Prof. - Inst, de Biol., Univ. Nac. de Tucuman, Chacabuco 461, S. M. 



de TUCUMAN, Argentina 

 a Glycolysis and tricarbo.xylic acid cycle during early development: regulatory mechanisms. Bufo 



arenarum (Anura) 

 b Oocyte maturation: energetic metabolism as an expression of cytoplasmic maturation. Same 



species as a 

 LEGNAME, C. R. - Inst, de Biol., Univ. Nac. de Tucuman, Chacabuco 461, S. M. de TUCUMAN, 



Argentina 

 a Nuclear transplantation (early stages until neurulation): 1. liaploid and diploid nuclei; 2. electro- 



phoretic analysis of proteins. Bufo arenarum (Anura) 

 LEHMAN, H. E.; Ph.D. - Dept. of Zool., Univ. of N. Carolina, CHAPEL HILL, NC 27514, U.S.A. 

 LEIGHTON, J.; M.D., Prof. - Dept. of Pathol., Med. Coll. of Pennsylvania, 3300 Henry Ave., 



PHILADELPHIA, PA. 19129, U.S.A. 

 a Neoplasia of urothehum. Homo sapiens (Primates) 

 LENHOFF, H. M.; Ph.D., Prof. - Dept. of Developm. and Cell Biol., Univ. of California, IRVINE, 



CA 92717, U.S.A. 

 a Chemistry, biosynthesis, and topography of mesoglea. Hydra littoraUs, H. pseudoligactis 



(Hydrozoa) 

 b Movement and differentiation of interstitial cell. Hydra littoralis (Hydrozoa) 

 c Development of mutants. Hydra viridis (Hydrozoa) 

 d Control of pedal laceration. Undescribcd spec. (Anthozoa) 

 LENSKY, Y.; Ph.D., Assoc. Prof. - Bee Res. Lab., Dept. of Entomol., Fac. of Agric, Hebrew Univ., 



P. O. Box 12, REHOVOT 76 100, Israel 

 LEOPOLD, R. A.; Ph.D. - USDA Metab. & Radiat. Research Lab., State Univ. Station, FARGO, 



ND 58103. U.S.A. 

 LESH-LAURIE, Mrs. G. E.; Ph.D. - Dept. of BioL, Case Western Reserve Univ., CLEVELAND, 



Ohio 44106, U.S.A. 

 a Purification of neurotrophic substance(s) involved in interstitial cell differentiation. Hydra spec, 



Podocoryne spec, Hydractinia spec, Pennaria spec, Aurelia spec. (Hydrozoa) 

 b Control of differentiated state of interstitial cells. Same species as a 

 c Role of mesoglea in morphogenesis. Same species as a 

 LESSEPS, R.J. (S.J.); Ph.D., Assoc Prof. - Dept. of Biol. Sci., Loyola Univ., NEW ORLEANS, 



LA 70118, U.S.A. 

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



(Aves) . . / u ■ 



b Sorting-out experiments to test hypotheses concernmg morphogenetic movements (embryonic 



heart, neural retina, pigmented retina). Same species as a 

 c Cell movements in early development. Nothobranchius neumanni (Cyprmodontidae, Teleostei) 

 LEV, R.; M.D., Assoc Prof. - Dept. of Pathol., New York Med. Coll., Basic Sci. Bldg., VALHALLA, 



NY 10595, U.S.A. 

 a AbiUty of fetus to absorb and utilize proteins (includmg antibodies), antibiotics and nutrients 



injected into amniotic sac Macaca mulatta (Primates), (Rodentia) 

 b Induction of fetal intestinal lactase by intra-amniotic injection of lactose. Rattus spec. 



(Rodentia), Macaca mulatta (Primates) 

 LEVENSON, G. E.; Ph.D., D.D.S., Assoc. Prof. - Dept. of Histol., Embryol. and Genet., Sch. of Dent. 



Med., Univ. of Pennsylvania, 4001 Spruce St., PHILADELPHIA, PA 19174, U.S.A. 

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



domesticus (Aves) 

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



monolayer culture. Same species as a 

 c Effects of ascorbic acid on growth, differentiation and matrix (collagen) synthesis in tooth germs 



m vitro. Mus musculus (Rodentia) 

 LEVI-MONTALCINI, Miss R.; M.D., Prof. - Dept. of Biol., Washington Univ., Skinker and Lindell 



Ave., ST. LOUIS, MO 63130, U.S.A. 

 LEWIS, C. A.; Ph.D. - Natl. Inst, of Dent. Res., Natl. Inst, of Health, Bldg. 30, Rm 434, BETHESDA, 



MD 20014, U.S.A. 



53 



