SORENSEN, R. A.; Ph.D. - Dept. of Biol., Gettysburg Coll., GETTYSBURG, PA 17325, USA 

 a Oocyte growth, differentiation, and maturation; in vitro pre- and postimpantation 



development. Mouse 

 SORENSON, J. C; Ph.D. - Dept. of Genet., North Carolina State Univ., Box 5487, RALEIGH, 



NC 27607, USA 

 a Molecular analysis of gene action during differentiation; nucleic acid isolation and 



characterisation; recombinant DNA. Zea mays (Gramineae) 

 SOUPART, P.; M. D., Ph.D., Prof. - Dept. of Obstet. and Gynecol., Sch. of Med., Vanderbilt Univ., 



NASHVILLE, TN 37232, USA 

 SPAZIANL, E.; Ph.D., Prof. - Dept. of Zool., Univ. of Iowa, lOWA-City, lA 52242, USA 

 SPENCER, A. N.; Ph.D. - Dept. of Zool., Univ. of Alberta, EDMONTON, Alta. T6G 2E9, Canada 

 SPERELAKIS, N.; Ph.D., Prof. - Dept. of Physiol., Sch. of Med., Univ. of Virginia, 



CHARLOTTESVILLE, VA 22908, USA 

 a Membrane properties of myocardial cells and skeletal muscle during embryonic development. 



Chicken, Rat 

 b Electrophysiology of heart cells and whole hearts cultured in vitro. Chicken, Rat 

 c Control of membrane properties, e.g., effect of niRNA. Chicken, Rat 

 d Ultrastructure of cardiac and skeletal muscle at different stages of embryonic and 



postnatal development. Chicken, Cavia porcellus, Mouse, Rat (Rodentia) 

 SPERRY, R. W.; Ph.D. - Div. of Biol., Calif. Inst, of Technol., PASADENA, CA 91125, USA 

 SPIEGEL, Ms. E. S.; Ph.D., Prof. - Dept. of Biol. Sci., Dartmouth CoU., HANOVER, NH 03755, 



USA 

 a Cell adhesion; cell surfaces; cell re aggregation. Arbacia punctulata, Lytechinus pictus (Echinoidea) 

 SPIEGEL, M.; Ph.D., Prof. - Dept. of Biol. Sci., Dartmouth Coll., HANOVER, NH 03755, USA 

 a Cell adhesion: cell reaggregation. Arbacia punctulata, Lytechinus pictus (Echinoidea) 

 SPIEGELMAN, M.; Ph.D. - Devi. Genet. Lab., Mem. Sloan-Kettering Cane. Ctr., 1275 York Ave., 



NEW YORK, NY 10021, USA 

 a Fine structure of normal and mutant embryos. Mouse 

 b Cell surface structures in early embryos. Mouse 

 c Detection of specific antigens on cell surfaces of embryos. Mouse 



d Role of extracellular matrix in cell movements and tissue organisation in embryos. Mouse 

 SIROFF, B. E. N.; Ph.D. - Dept. of Biol., Loyola Univ., 6525 N. Sheridan Rd., CHICAGO, 



IL 60626, USA 

 SPITZER, N. C; Ph.D. - Ctr. for Devi. Biol. B-022, Univ. of CaUf., San Diego, LA JOLLA, CA 



92093, USA 

 SPRADLING, A. C; Ph.D. - Dept. of Embryol., Carnegie Inst, of Washington, 115 W. University 



Pkw., BALTIMORE, MD 21210, USA 

 a Molecular mechanisms controlling expression of chorion protein structural genes during follicle 



cell development; genetic studies of follicle cell function. Drosophila melanogaster (Diptera) 

 SPYKER, J. M.; Ph.D. - Dept. of Pharmacol., Univ. of Arkansas for Med. Sci., 4301 West Markham, 



LITTLE ROCK, AR 72201, USA 

 SRIVASTAVA, G. K.; M.Sc. - Dept. of Biochem., Fac. of Sci., Allahabad Univ., ALLAHABAD 



211002. India 

 SRIVASTAVA, H. C; M.S., Prof. - Dept. of Anat., Med. Coll., BARODA, 390001, India 

 STAAL, G. B.; Dr., Ir. - Zoecon Corp., California Ave., PALO ALTO, CA 94304, USA 

 STANLEY, J. G.; Ph.D., - Dept. of ZooL, Univ. of Maine, ORONO, ME 04469, USA 

 a Induction of artificial gynogenesis and polyploidy. Salmo salar, Salvelinus fontinalis 



Teleostei) 

 STAPLES, R. E.; Ph.D. - HaskeU Lab. (Du Pont), WILMINGTON, DE 19898, USA 

 a Methods for determining teratogenicity and embryotoxicity of environmental agents and 



chemicals. Rat, Mesocricetus auratus (Rodentia), Rabbit 

 STARK, R. A.; Ph.D. - Dept. of Anat., Univ. of lUinois, P.O. 6998, CHICAGO, IL. 60680, USA 

 a Testing of antifertihty compounds in an in vitro fertilization system. Mouse 

 b Developmental capabilities of polyploid zygotes. Mouse 



STAY, Ms. B.; Ph.D., Prof. - Dept. of ZooL, Univ. of Iowa, lOWA-City, lA 52242, USA 

 a Control of brood sac secretion in a viviparous form. Diploptera punctata (Blattodea) 

 b Control of juvenile hormone synthesis during the reproductive cycle. Same species as a 

 STEEVES, T. A.; Ph.D. - Dept. of Biol., Univ. of Saskatchewan, SASKATOON, Sask. S7N OWO, 



Canada 

 a Structure and function of shoot apical meristems. Helianthus annuus (Compositae) 

 STEINBERG, M. S.; Ph.D., Prof. - Dept. of Biol., Princeton Univ., PRINCETON, NJ 08544, USA 

 a Mechanisms of formation of pronephric duct. Various spp. (Urodela; Anura) 

 b Measurement of intercellular adhesive intensities (tissue sigma) in embryonic tissues. Species as a 

 c Identification of adhesion systems mediating morphogenetic movements and tissue assembly in 



embryos. Various spp. (Urodela; Anura), Chicken 

 STEINHARDT, R. A.; Ph.D., Prof. - Dept. of Zool., Univ. of California, BERKELEY, CA 94720, 



USA 

 a Ionic regulation of metabolism at fertilization; cleavage; pH sensitivity of protein synthesis rate. 



Lytechinus pictus (Echinoidea), Xenopus laevis (Anura) 

 STEPHENS, T. D.; Ph.D. - Centr. Lab. for Human Embryol., Dept. of Pediat., Univ. of Washington, 



SEATTLE, WA 98195, USA 

 a Mechanical manipulations of the limb field and surrounding tissue in order to identify tissues 



and agents that define this field. Chicken 



82 



