SPERRY, R. W. Ph.D. — Div. of Biol.. Calif. Inst, of Technol.,. PASADENA. Calif. 91109, 

 U.S.A. • 



a The development and regeneration of behavioral nerve networks, (lower Vertebrata) 



SPIEGEL, Mrs. E. SCLUFER Ph.D. — Dept. of Biol. Sci., Dartmouth Coll.. HANOVER. 

 N.H. 03755, U.S.A. 



a Protein changes in development. Lytechinus pictus. Strong ylocentrotus purpurafus (Echi- 

 noidea), Rana pipiens, R. catesbeiana (Anura) (in collaboration with M. SPIEGEL) 



b Role of enzyme induction in development. Rana pipiens, R. catesbeiana (Anura) (in col- 

 laboration with M. SPIEGEL) 



c Biochemistry of metamorphosis. Rana pipiens, R. catesbeiana (Anura) 



SPIEGEL. M. Ph.D., Prof. — Dept. of Biol. Sci.. Dartmouth Coll., HANOVER. N.H. 

 03755. U.S.A. • 



a Protein changes in development. Arbacia punctulata, Lytechinus pictus. Strong ylocentrotus 

 purpuratus (Echinoidea), Rana pipiens, R. catesbeiana (Anura) (in collaboration with 

 Mrs. E. S. SPIEGEL) 



b Role of enzyme induction in development. Rana pipiens, R. catesbeiana (Anura) (in col- 

 laboration with Mrs. E. S. SPIEGEL) 



SPIRITO. A. Dott., Prof. — 1st. di Biol. Gen,, Fac. di Med., Univ. di Roma. Policlinico 

 Umberto I, 00100 ROMA, Italy • 



SPIROFF, B. E. N. Ph.D. — Dept. of Biol., Loyola Univ., 6525 N. Sheridan Rd., 

 CHICAGO, 111. 60626, U.S.A. 



a Effects of thalidomide on development. (Aves) 



b Function and structure of the epiphysis. (Aves) 



SPRATT. N. T.. Jr. Ph.D., Prof. — Dept. of ZooL, Coll. of Biol. Scis., Univ. of Minnesota, 

 MINNEAPOLIS, Minn. 55455, U.S.A. • 



a Investigating the nutrient requirements essential to morphogenesis and growth in the early 

 stages of development (pre-streak and streak blastoderms). Gallus domesticus (Aves) 



b Survey of dehydrogenase enzymes in early embryos. 1. Localization of enzyme activity. 

 2. Structural integrity and enzyme activity. Gallus domesticus (Aves) 



c Cytological study of the developmental center (organizer). Gallus domesticus (Aves) 



d Anlysis of mechanism of morphogenetic movements by time-lapse cinematography. Gallus 

 domesticus (Aves) 



e Analysis of dynamic population patterns (pattern formation by free-swimming, ciliated 

 and flagellated organisms). Tetrahymena spec. (Ciliata), Euglena spec. (Euglenophyceae) 

 Arbacia punctulata (Echinoidea) 



f Integrative mechanisms in early development. (Aves) 



g Role of the microenvironment in cell differentiation. (Aves) 



SPREY, Th. E. M.Sc. — Zool. Lab., Univ. of Leiden, Kaiserstr. 63, LEIDEN, Netherlands 



a Histochemical aspects of differentiation of imaginal discs. Calliphora erythrocephala (Dip- 

 tera) 



h Studies of cell proliferation and degeneration during development of imaginal discs. Calli- 

 phora erythrocephala (Diptera) 



SPRINGER, Ch. A. M.S. — Dept. of Biol., Carnegie-Mellon Univ., PITTSBURGH, Pa., 

 U.S.A. 



SRB, V. — Dept. of Biol.. Med. Fac. Charles Univ.. Simkova 870. HRADEC KRALOVfi, 

 Czechoslovakia 



a Studies of chromosomes in the developing embryo; influence of ionizing radiation or 

 chemomutagens on karyotype. Gallus gallus (Aves), Mus musculus (Rodentia) 



STAAL, G. B. Dr., Ir. — Lab. of Entomol.. Agric. Univ., Binnenhaven 7, P.O.B. 62, 

 WAGENINGEN. Netherlands 



STACKHOUSE, H. L. Ph.D. — Dept. of Zool., Univ. of Toronto, TORONTO 5, Ont., 

 Canada 



STADLER, H. Cand.phil. — Div. of Cell Biol, and Chem. Embryol., Zool. Inst., Univ. of 

 Bern, Sahlistr. 8, CH-3000 BERN, Switzerland 



a Thyroxine and RNA synthesis in tadpole tissues. Xenopus laevis (Anura) (in collabor- 

 ation with R. WEBER) 



STAGNI, Miss A. Dr.. Prof. — Inst, of Zool., Fac. of Sci., Univ. of Bologna, Via S. Gia- 

 como 9, 40126 BOLOGNA, Italy 



a Sex determination and sex differentiation. Chlorohydra viridissima (Hydroidea) 



b Cytochemical and electron microscopical study of oogenesis and spermatogenesis. Chloro- 

 hydra viridissima (Hydroidea) 



c Cytometric, cytochemical and biochemical study of nucleolus during oogenesis. Spirorbis 

 pagenstecheri (Serpulidae, Polychaeta) 



d Inhibition by antibiotics of steroid hormone-induced sex-reserval in tadpoles. Rana dal- 

 matina (Anura) 



STAMPA (DI CASTRO), Mrs. M. Dr.Biol.Sci. — 1st. di Zool. dellUniv., Viale Regina 

 Elena 324 (al Policlinico). ROMA, Italy 



a Growth and differentiation of regeneration blastema in vivo and in vitro. Planaria 

 torva, Dugesia etrusca (Turbellaria) (in collaboration with P. PASQUINI and H. MA- 

 NELLI) 



164 



