b Cytology of neonatal liver; differentiation of intercellular junctions, characters of micrcv 

 bodies; histochemical differentiation. Mas musculus (Rodentia) (in collaboration with 

 J. P. TURCHINI and P. MALET) 



POURREAU (SCHNEIDER), Mrs. N. M. Dr.es Sci. — Lab. d'Embryol. exper. du Coll. 

 de France et du C.N.R.S., 1 1 Place M. Berthelot. PARIS Ve. France • 



a Use of organ culture and suspension culture techniques for the study of functional testi- 

 cular interstitial cell tumors. Mus musculus, Rattus norvegicus (Rodentia) 



b Establishment of cell lines from a rat testicular interstitial cell tumor for studies on the 

 functional capacities of isolated Leydig tumor cells. Rattus norvegicus (Rodentia) 



c Effect of testicular interstitial cell tumor explants on prostate from 6 week old animals in 

 organ co-culture. Rattus norvegicus (Rodentia) 



d Attempts to obtain sex transform_ation in embryonic gonads by association with Leydig 

 cell tumors in organ culture. Rattus norvegicus (Rodentia) 



POURTOIS, M. M.D., Lic.Sc.Dent. — Lab. d'Embryol.. Inst. d'Anat., Univ. de Bruxelles, 

 97 rue aux Laines, BRUXELLES 1, Belgium 



a Normal and abnormal closure and fusion of primary and secondary palate (tissue culture, 

 histochemistry, histology). Rattus norvegicus, Mus musculus (Rodentia), Homo sapiens 

 (Primates) 



b Morphogenesis and cytogenesis of tooth buds. Rattus norvegicus, Mus musculus (Rodentia) 



PRAHLAD. K. V. Ph.D., Prof. — Dept. of Biol. Sci., Northern Illinois Univ., DeKALB, 111. 

 60115, U.S.A. 



a Study of induced metamorphosis: histological maturity and the development of tissue 

 sensitivity to thyroid hormones in the embryo; biochemical changes evoked by thyroid 

 hormones in embryonic and adult susceptible tissues. Ambystoma mexicanum, A. tigrinum. 

 Nectucus maculosus (Urodela) 



h Comparative study of hypothalamo-pituitary-thyroid axis in pre- and post-metamorphic 

 animals. Ambystoma mexicanum, A. tigrinum, Necturus maculosus (Urodela) 



PRASAD, M. R. N. Ph.D., Prof. — Dept. of Zool., Univ. of Delhi. DELHI 7, India 



PRASDNIKOV, E. Cand.med.sci. — Dept. of Embryol., Murmansky Sea-Biol. Inst., Acad, 

 of Sci., DALNII ZELENZI, U.S.S.R. 



PRATT, C. W. McE. M.D. — Anat. School, Univ. of Cambridge, Downing St.. CAM- 

 BRIDGE CB2 3DY, England 



a Development of skeletal tissue. 



PRAY. T. R. Ph.D.. Prof. — Dept. of Biol. Sci.. Univ. of Southern California. University 

 Park. LOS ANGELES. Calif. 90007. U.S.A. 



a Development of the gametophytes and juvenile stages of the sporophytes. ( Cheilantheae, 

 Pteridaceae, Filicinae) 



b Development of the vein systems of leaves. Anemia spec, Macsilea spec, Cyctomium 

 spec. Acrostichum spec and other spp. (Filicinae) 



c Investigation of factors controlling planes of cytokinesis in early gametophyte devel- 

 opment. Cheilanthes spp. (Pteridaceae, Filicinae) 



PRCHAL. J. F. M.D. — Biochem. Dept.. Med. School, Dalhousie Univ.. Sir Charles 

 Tupper Building. HALIFAX. N.S., Canada 



a Regulation of synthesis of hemoglobin and blood proteins in the embryo by transfer RNA. 

 Gallus gallus (Aues) 



PREDA, V. G. M.D.. Prof. — Cat. de Biol., Inst. Medico-Farmaceutic. Str. Pasteur 6, 

 CLUJ. Rumania 



a Influence de la temperature d'incubation sur I'infrastructure et I'immunomorphologie de 

 I'embryon. Gallus spec. (Aves) 



b Affrontation d'organes embryonnaires in vitro. Mus rattus (Rodentia) 



c Action de I'hormone gonadotrope choriale sur la differenciation sexuelle des canaux de 

 Miiller. Gallus spec. (Aves) 



PRESCOTT, D. M. Ph.D., Prof. — Inst, for Developm. Biol.. Univ. of Colorado, BOUL- 

 DER, Colo. 80302, U.S.A. 



PRESLEY, R. M.B., B.Chir. — Anat. School. Univ. of Cambridge, Downing St., CAM- 

 BRIDGE CB2 3DY. England 



a Tissue culture and embryogenesis. (Mammalia) 



b Ultrastructure of embryos. Various spp. (Rodentia) 



c Fertilization; kinetics and nature of block to polyspermy. ( Echinodermata ) 



PRESS. N. Ph.D.. Prof. — Dept. of Zool. Univ. of Wisconsin. MILWAUKEE. Wis. 

 53201, U.S.A. 



a Transfer of macromolecules from follicle cells to developing oocytes. (Aves) 



b Unusual organelles in the ovary. (Aves) 



c Respiration of oocytes. (Aves) 



PRESTIGE, M. C. M.A. — Physiol. Dept., Med. School, Univ. of Edinburgh. Teviot Place. 

 EDINBURGH 8. Scotland. U.K. 



PRICE. Miss D. Prof. (Emer.) — Dept. of Biol.. Div. of Biol. Sci.. Univ. of Chicago. 

 CHICAGO. 111. 60637, U.S.A. • 



a The development of endocrines in embryonic systems 



140 



