Ricinus communis (Euphorbiaceae), Helianthus annuus (Compositac), Pharbitis nil (Convol- 



vulaceae) 

 SIETSMA, J. H.; Dr. - Lab. of Bot., State Univ., Kerklaan 30, P.O. Box 14, HAREN (Gr.), 



Netherlands 

 a Composition of the cell wall (chemical analysis, enzymatic degradation) in relation to develop- 

 ment. Schizophyllum commune (Basidiomycetes, Fungi) 

 b Effect of sterols on sexual propagation and morphogenesis. Pythium spec. (Oomycetes, Fungi) 

 SIEWING, R.; o.Prof. - I. Zool. Inst, der Univ. Erlangen-Niirnberg, Univcrsitatsstr. 19, 852 



ERLANGEN, B.R.D. (Germany) 

 a Development of body segmentation. (Brachiopoda, Phoronidea) 

 b Metamorphosis. Actinotrocha spec. (Phoronidea) 

 SIGNORET, J.; Dr.es Sci., Prof. - Lab. d'Embryol., Unite de Sci., Univ. de Caen, 14032 CAEN, 



France 

 a La cinetique cellulaire au cours de la segmentation; modahtes, determinisme, signification. 



Ambystoma mexicanum (Urodela) 

 b Study of nuclear differentiation and specific activities by means of nuclear transplantation. Same 



species as a 

 SIMKISS, K.; Ph.D., Prof. - Dept. of Zool., Univ. of Reading, READING RG6 2AJ, England 

 a Calcium pumps in the chorioallantoic membrane and their role in transporting ions from eggshell 



to embryo. Gallus domesticus (Aves) 

 b Electrolyte movements from chorion and from allantoic fluid to blood. Same species as a 

 SIMPSON, Mrs. P.; B.Sc.(Hons.) - Centre de Genet. Molec, C.N.R.S., 91190 GIF-sur-YVETTE, 



France 

 a Temperature-sensitive mutations blocking clone development in imaginal discs, including t.s. cell 



lethals and mutations affecting the rate of cell division. Drosophila melanogaster (Diptera) 

 SIN, Y. T.; Ph.D. - Dept. of Genet., Univ. of Nijmegen, Toernooiveld, NIJMEGEN, Netherlands 

 a Induction of puffing by injection of mitochondrial extracts into salivary gland cells. Drosophila 



hydei (Diptera) 

 SINITSINA, Miss V. F. - Lab. of Developm. Cytogenet., Inst, of Developm. Biol., Acad, of Sci. of the 



USSR, Vavilov St. 26, MOSCOW 11 7334, U.S.S.R. 

 SISTO DANEO, Miss L. - Dept. of Human Anat., Univ. of Torino, Corso M.d'Azeglio 52, 10126 



TORINO, Italy 

 a Ultrastructure of fast and slow muscles in the embryo. Gallus domesticus (Aves) 

 SKATKOV, M. E.; Cand.med.sci. - Lab. of Cytol., Inst, of Med. Genet., Acad, of Med. Sci. of the 



USSR, Kashirskoe Shosse 6/A, MOSCOW 115478, U.S.S.R. 

 SKOBLINA, M. N. - Inst, of Developm. Biol., Acad, of Sci. of the USSR, Vavilov St. 26, MOSCOW 



117334, U.S.S.R. 

 a Effect of gonadotropins and changes in the germinal vesicle and in the oocyte cytoplasm during 



maturation. (Acipenseridae, Chondrostei; Amphibia) (with T. A. DETTLAFF and T. B. 



AISENSTADT) 

 b Role of karyoplasm in the formation of the mature egg properties. Acipenser stellatus 



(Chondrostei), Misgurnus fossihs (Teleostei), Rana temporaria, Bufo spec. (Anura) 

 c Mechanism of action of gonadotropic hormones. Same species as b 

 SKREB, N.; M.D., D. Sc, Prof. Inst, of Biol., Fac. of Med., Univ. of Zagreb. Salata 3, P.O. Box 166, 



41001 ZAGREB, Yugoslavia 

 a Early differentiation; transplantation, in vitro culture, autoradiography. Rattus norvegicus 



(Rodentia) (with B. LEVAK, Lj. HOFMAN and A. SVAJGER (Inst, of Histol. and Embryol.)) 

 b Analysis of soluble proteins in organogenesis. Same species as a (with D. SERMAN) 

 c Differentiation of early postimplantation stages under the kidney capsule, teratocarcinogenesis, 



nature of embryonal carcinoma cells; transplantation, electron microscopy. Mus musculus 



(Rodentia) (with D. SOLTER and I. DAMJANOV (Inst, of Pathol.)) 

 SLABV, O.; D.Sc, Prof. - Inst, of Histol. and Embryol., Charles Univ., Karlovarska 48, PLZEfvJ, 



Czechoslovakia 

 a Development of the nasal capsule from an evolutionary standpoint. (Amniota, incl. Homo 



sapiens) 

 SLACK Mrs. C; D.Sc, Ph.D. - Inst, of Genet., Univ., GLASGOW W.2, Scotland, U.K. 

 SLADECEK, F.; RNDr., DSc, Prof. Dept. of Exp. Zool., Charles Univ., Vinicna 7, 12844 PRAHA 



2, Czechoslovakia 

 a Transplantation of nuclei in relation to nucleic acids. (Amphibia) (with J. NEDVfDEK) 

 b Number of cell generations in relation to cell determination. (Amphibia) 

 SLAM A, K.; RNDr., CSc. - Dept. of Physiol., Inst, of Entomol., Czech. Acad, of Sci., Na Folimance 



5, 12000 PRAHA 2, Czechoslovakia 

 SLIPKA, J.- Dr.Med., Dr.rer.nat., CSc. - Inst, of Histol. and Embryol., Charles Univ., Karlovarska 48, 



PLZEN, Czechoslovakia 

 a The development and teratology of the branchial region. (Amniota, incl. Homo sapiens) 

 SMART, 1. H. M.; M.B., Ch.B. Dept. of Anat., Univ. of Dundee, DUNDEE DDl 4HN, Scotland, 



U.K. 

 SMIRNOVA, Mrs. E. I.; Cand.biol.sci. - Chair of Embryol., Biol. Fac, State Univ. of Moscow, Lenin 



Hills, MOSCOW 117234, U.S.S.R. 

 SMITH, E. J. C ; Pii.D. Inst. d'Embryol. et Tcratol. Exper. du C.N.R.S., 49bis Av. de la Belle 



Gabrielle, 94130 NOGENT-sur-MARNE, France 

 a Growth factors necessary for the M«rvival and growth of malignant tumours in organ culture. 



Gallus gallus (Aves) (with Et. WOLFF ar.d Ijn. WOLFF) 

 b DNA polymcra.se activities in different subcellular fractions of the developing brain. Same species 



94 



