(Primates), (Rodentia; Carnivora; Insectivora; Chiioptera) 

 b Role of primitive streak and tail region in early differentiation of the body (submicroscopic and 



cytochemical studies in normal and experimental conditions). Rana esculenta (Anura), Gallus 



domesticus (Aves), Rattus spec. (Rodentia) 

 VAGNETTI, Ms. D.: Dr. - 1st. di Anat. Comp., Univ. di Perugia, Via A.Pascoli, 06100 PERUGIA, 



Italy 

 a Ultrastructure of the cocoon. Dugesia lugubris (Turbellaria) 



b Action of antiandrogens on the ultrastructure of male genital organs. Cavia porcellus (Rodentia) 

 VAHERI, A. - Lab. of Exp. Embryol., lII.Dept. of Pathol., Univ. of Helsinki, Haartmaninkatu 3, 



00290 HELSINKI 29, Finland 

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



Gallus domesticus (Aves) (with J. J. WARTIOVAARA and S. STENMAN) 

 VAHS, W.; Dr.phil., Prof. - ZooL Inst, der Univ., Weyertal 119, 5000 KOLN 41, B.R.D. (Germany) 

 a Phase specific gene activities in the eyecup-lens-system of the developing embryo, as revealed by 



quantitative cytochemical DNA determinations. Salmo irideus (Teleostei), Triturus vulgaris 



(Urodela) 

 b Ultrastructure of embryonic cells undergoing induction and differentiation. Triturus vulgaris 



(Urodela) 

 c Amitosis in liver and other organs (polyploidization in embryos and larvae). (Amniota) 

 d Polyploidization and cell cycle. (Ciliata) 

 VAKAET, L. C. A.; M.D., Prof. - Lab. of Anat. and Embryol., State Univ. Ctr., Groenenborgerlaan 



171, 2020 ANTWERPEN, Belgium 

 a Early development (scanning and transmission electron microscopy). Gallus domesticus, Coturnix 



c. japonica (Aves) 

 b In vitro culture of blastoderms, normal and after experimental interventions; histochemistry: 



enzymes and mucopolysaccharides. Same species as a 

 VAKHRUSHEVA, Ms. M. P.; Dr. - Inst, of Med. Genet., Kashirskoye Chaussee 6a, MOSCOW 1 15478, 



U.S.S.R. 

 a Genetic regulation of development of brain, eye, and limbs. Mus musculus (Rodentia) 

 VALKEMA-PORRENGA, Ms. F. C; Drs. - Lab. for Cell BioL and Histol., State Univ., Rijnsburgerweg 



10, LEIDEN, Netherlands 

 a Development of bone and onset of mineralization in radii of 14-day embryos (electron 



microscopy). Mus musculus (Rodentia) 

 VAN GANSEN, Ms. P.; Prof. - Dept. of Molec. Biol., Free Univ. of Brussels, 67 rue des Chevaux, 



1640 RHODE-ST-GENtSE, Belgium 

 a Previtellogenic and vitellogenic oocytes. 



b Nucleolar protein synthesis (high resolution autoradiography). Xenopus laevis (Anura) 

 c Ageing in primary culture of embryonic fibroblasts: ultrastructure, collagen synthesis, replication 



and transcription (transmission and scanning electron microscopy, autoradiography, thymidine 



and uridine incorporation, actinomycin fixation). Mus musculus (Rodentia) 

 VANNEREAU, Ms. A. - Lab. de Biol. Cell., Fac. de Pharm., Univ. Paris-Sud, 22 rue J. B. Clement, 



92290 CHAtENEY-MALABRY, France 

 a Gametogenesis, embryogenesis, formation of haustorium (ultrastructure). Planudnaceae 

 VANNINI, E.; Dr., Prof. - Inst, of ZooL, Univ. of Bologna, Via S. Giacomo 9, 40126 BOLOGNA, 



Italy 

 a Experimental analysis of the development of the gonad and Bidder's organ. Bufo spec. (Anura) 

 b Inhibition by antibiotics of testosterone-induced sex-reversal in tadpoles. Rana dalmatina (Anura) 

 c. General study of the problem of the "sex gradient" in various hermaphroditic animals. 



(Hydroidea;Tricladida, Turbellaria; Serpulidae, Polychaeta) 

 d Nervous system and neurosecretion in asexual reproduction, sexual differentiation and regenera- 

 tion. Hydra spec, Chlorohydra viridissima (Hydroidea), Dugesia spec, Polycelis nigra, Den- 



drocoelum lacteum (Turbellaria) 

 VAN PR AFT, M. - Lab. de Biol, des Invert. Marins et Malacol., Museum Natl. d'Hist. Nat., 57 rue 



Cuvier, 75005 PARIS, France 

 a Experimental morphogenesis and regeneration. Actinia equina (Actinozoa) 

 VAN ROELEN,C. - Lab. of Anat. and EmbryoL, State Univ. Ctr., Groenenborgerlaan 171, 2020 



ANTWERPEN, Belgium 

 a Histochemistry and biochemistry of the carbohydrate-containing extracellular matrix of the 



blastoderm. (Aves) 

 b Concanavalin A-receptors during early development (histochemistry). (Aves) 

 VAN TOLEDO, B. - Dept. d'Embrvol. et Teratol. Exp., Inst, de Biol. Anim., Fac. des Sci., Univ. de 



Fribourg, 1700 FRIBOURG, Switzerland 

 a Teratogenic action of fluoride. Gallus gallus (Aves) 

 VARGA, A.; Dr., Ir. - Dept. of Plant Physiol., Agric Univ., Arboretumlaan 4, WAGENINGEN, 



Netherlands 

 VASSALL ADAMS, P. R.; B.Sc. - Dept. of Anat., Charing Cross Hosp. Med. Sch., Fulham Palace Rd., 



LONDON W6 8RF, England 

 a Development of the conducting system in the heart. (Aves) 

 VASSE, J. - Inst. d'Embryol. du C.N.R.S. et du Coll. de France, 49bis av. de la Belle Gabrielle, 94130 



NOGENT-sur-MARNE, France 

 a Hemopoiesis in the embryo. Emys orbicularis (Chelonia) 

 b Limb bud differentiation. (Chelonia) 

 VASSETZKY, S. G.; Cand.biol.sci. - Inst, of DevL Biol., Acad, of Sci. of the USSR, VavUov St. 26, 



MOSCOW 117334, U.S.S.R. 



105 



