a Egg maturation (electron microscopy, cytochemistry). Xenopus laevis (Anura) 



b Presence of lysosomal enzymes in yolk platelets of developing eggs. Same species as a 



STEINMETZ, H. - Inst, fur Genet., Univ. des Saarlandes, 66 SAARBROCKEN 11, B.R.D. (Germany) 



a Regulation of isoenzyme loci and lethal factors. Drosophila melanogaster (Diptera) 



STENMAN, S. - Lab. of Exp. Embryol., III.Dept. of Pathol., Univ. of Helsinki, Haartmaninkatu 3, 



00290 HELSINKI 29, Finland 

 a Cell surface antigen localisation in differentiation and malignancy of embryonic fibroblasts. 



Gallus domesticus (Aves) (with J. J. WARTIOVAARA and A. VAHERI) 

 STEPANOV, A. S. - Inst, of Devi. Biol., Acad, of Sci. of the USSR, Vavilov St. 26, MOSCOW 



117334, U.S.S.R. 

 a Regularities of the oocyte maturation process. (Acipenseridae, Chondrostei; Amphibia) (with 



T. A. DETTLAFF, E. V. CHULITZKAYA and P. E. FEULGENGAUER) 

 STEPHAN,F.; D.Sc, Prof. - Lab. de Zool., Univ. de Nancy I, C.O.140, 54037 NANCY Cedex, 



France 

 a Morphogenesis of the embryonic axis. Gallus gallus (Aves) 

 b Postembryonic development of the integument. Calliphora spec. (Diptera) 

 c Role of nervous system in pharynx induction. (Turbellaria) 

 ST£PHAN (DUBOIS), Ms. F.; D.Sc. - Lab. de Zool., Univ. de Nancy I, C.O.140, 54037 NANCY 



Cedex, France 

 a Migration and differentiation of regeneration cells. (Tricladida, Turbellaria; Microdrila, 



Oligochaeta) ^ , 



StERBA, O. - Dept. of Morphol., Inst, of Vert. Zool., Czech. Acad, of Sci., Kvetna 8, 60365 BRNO, 



Czechoslovakia 

 a Prenatal growth and organogenesis in altricial (nidicolous) and precocial (nidifugous) species. 



(Insectivora; Rodentia; Carnivora; Artiodactyla) 

 STEVEN, D. H.; M.A., Vet.M.B. - Anat. School, Sub-Dept. of Vet. Anat., Univ. of Cambridge, Tennis 



Court Rd., CAMBRIDGE CB2 IQS, England 

 a Electron microscopy of placenta in relation to physiological exchange; control of parturition and 



maintenance of the fetal environment. Ovis aries (Artiodactyla), Equus caballus (Perissodactyla) 

 b Structure and function of binucleate cells in the placenta. Ovis aries (Artiodactyla) 

 STOCKER, R. F.; Ph.D. - Zool. Inst., Univ. Basel, Rheinsprung 9, 4051 BASEL, Switzerland 

 a Determination of the time at which connections are established between sensory axons from 



antennal disc and brain, especially the question whether axons from homeotic legs in mutant 



Antennapedia are guided to normal antennal projection centres by fibers present before the 



transformation of the disc mto antennal-leg disc (ultrastructure, reconstructions). Drosophila 



melanogaster (Diptera) 

 b Experiments on tlie cause of the almost complete absence of muscles in homeotic legs of 



Antennapedia. Same species as a 

 STOLE, R.; D.Med., D.Sc, Prof. - Lab. d'Histol. et d'EmbryoL, Univ. de Bordeaux II, 146 rue 



Leo-Saignat, 33076 BORDEAUX Cedex, France 

 a Differentiation of the genital tract. Gallus gallus (Aves) 

 b Physiology of the embryonic thyroid. Same species as a 

 STRAATEN, H. W. M. van; Drs. - Vet. Anat. and EmbryoL Inst., State Univ. of Utrecht, Bekkerstraat 



141, UTRECHT, Netherlands 

 a Testicular development from fetus till sexual maturity (histology, histochemistry): 1. normal 



development; 2. development in cryptorchidism; 3. testicular autotransplantation. Sus scrofa 



domesticus (Artiodactyla) 

 STRAUSS, F.;M.D., Prof. - 33 Eichenrain, 3122 KEHRSATZ, Switzerland 

 a Comparative implantation and placentation. (Prototheria; Eutheria, Mammalia) 

 b Comparative anatomy of the female reproductive system. Same species as a 

 STREET, H. E.; D.Sc, Prof. - Bot. Labs., Univ. of Leicester, Adrian Bldg., LEICESTER LEI 7RH, 



England 

 a Embryogenesis and organogenesis in tissue and cell cultures (biochemistry, histochemistry, 



electron microscopy). Daucus carota (Umbelliferae), Atropa belladonna, Nicotiana spp. 



b Cytodifferentiation and its hormonal control in vitro; induction of synthesis of secondary 



metabolites using mutant cell lines derived from haploid cells. Nicotiana spp., Atropa belladonna 



(Solanaceae), Acer pseudoplatanus (Aceraceae) 

 c Chloroplast differentiation and development of autotrophic growth in vitro. Spinacea oleracea 



(Chenopodiaceae) 

 STROEVA Ms O. G.; Dr.biol. - Koltzov's Lab. of Cell Differ., Inst, of Devi. Biol., Acad, of Sci. of 



the USSR, Vavilov St. 26, MOSCOW 1 17334, U.S.S.R. 

 a Development and teratology of the iris and ciliary body in organ culture. Rattus norvegicus 



(Rodentia) (with L. V. AKHABADZE) 

 b Dependence of DNA synthesis and cell proliferation in pigment epithelium of the retina upon 



general growth factors of the eye. Same species as a (with I. G. PANOVA) 

 c Development of regional differences in neural retina and pigment epithelium (synthesis of RNA, 



electron microscopy). Acipenser stellatus, A. giildenstadti (Chondrostei) (witli V. I. MITASHOV 



and E. A. BABURINA) 

 STROLENBERG, G. E. C. M. - Dept. of Zool., Cathol. Univ., Toernooiveld, NIJMEGEN, Netherlands 

 a Ultrastructure of neurosecretory system during development (Decapoda, Crustacea) 

 STROM, R.; Fil.lic - Inst, of ZooL, Uppsala Univ., Box 561, 751 22 UPPSALA, Sweden 

 a Larval development. (Bryozoa) 

 STRUDEL, G.; D.Sc - Inst. d'EmbryoL du C.N.R.S. et du CoU. de France, 49bis av. de la Belle 



98 



