TYNDALE-BISCOE, C. H. Ph.D. — Dept. of Zool., School of Gener. Studies, Australian 



Natl. Univ.. Box 4, CANBERRA, A.C.T., Australia 

 a Early development, including fine structure. Antechinus stuarti (Marsupialia) 

 b Fine structure of the blastocyst. Oryctolagus cuniculus (Lagomorpha) 

 UBBELS, Miss G. A. M.Sc. — Hubrecht Lab. (Internat. Embyol. Inst.), Uppsalalaan 1, 



Universiteitscentrum „De Uithof, UTRECHT, Netherlands 

 a Histochemical analysis of neural and mesodermal competence in the blastula/gastrula 



stage. Ambi^stoma mexicanum (Ucodela) (in collaboration with J. G. BLUEMINK, P. D. 



NIEUWKOOP and P. Th. M. v.d. SAAG) 

 b Cytochemical analysis of oogenesis and early development. Gryllus domesticus, Locusta 



migratoria (Orthoptera) 

 UCHIDA, T. A. Dr.Agr. — Zool. Lab., Fac. of Agric, Kyushu Univ., FUKUOKA, Japan 

 a Studies on reproduction and embryology. Pipistrellus abcamus, Miniopterus schreibersi 



(Microchiroptera) 

 UHER, J. M.D., C.Sc. — Clin, of Obstet. and Gynecol., Postgraduate School of Med., nabr. 



K.Marxe 157, PRAHA-Podoli, Czechoslovakia 

 ULBERG, L. C. Ph.D., Prof. — Dept. of Anim. Sci., North Carolina State Univ., P.O.Box 



5127, RALEIGH, N.C. 27607, U.S.A. 

 a Growth in vitro of very young embryos. Mus musculus (Rodentia), Oryctolagus 



cuniculus (Lagomorpha), Ovis aries, Sus scro[a (Arfiodactyla) 

 h Influence of stress (high temperature) on subsequent young embryo development. Mus 



musculus (Rodentia), Oryctolagus cuniculus (Lagomorpha), Ovis aries, Sus scrofa 



(Arfiodactyla) 

 c Altered viability of sperm as a cause for delayed embryo death. Mus musculus (Rodentia), 



Oryctolagus cuniculus (Lagomorpha), Ovis aries. Sus scrofa (Arfiodactyla) 

 ULLMANN, Miss S. L. Ph.D. — Dept. of Zool., The Univ., GLASGOW W.2. Scotland. 



U.K. 

 a Autoradiography of ovarioles. Tenebrio molitor (Coleoptera) 

 b Oogenesis in vitro. Tenebrio molitor (Coleoptera) 

 ULRICH, H. Dr.phil., Prof. — Zool. Inst, der Eidg. Techn. Hochschule, Universitatsstr. 2, 



8006 Zurich, Schweiz 

 a Action of X-rays on nucleus and cytoplasm of eggs, and on embryonic stages. Drosophila 



melanogasfec (Dipfera) 

 b Morphology, physiology and cytology of paedogenetic-bisexual reproduction cycle. 



Heteropeza pygmaea (= Oligarces paradoxus), Miasfor mefraloas (Ifonididae = Cecido- 



myidae, Dipfera) 

 URBAN, P. Ph.D. — Dept. of Biol., Yale Univ., NEW HAVEN, Conn. 06520, U.S.A. 

 a Fertilization. Bryopsis spec. (Algae) 



• URBANI, E. Prof. — Lab. di Istol. ed Embriol., Fac. di Sci.. Univ. di Roma. ROMA, Italia 

 URBANI-MISTRUZZI. Mrs. L. Prof.Inc. — Lab. di Istol. ed Embriol.. Fac. di Sci., Univ. di 



Roma, ROMA, Italia 



URSPRUNG. H. Ph.D., Prof. — Dept. of Biol., Johns Hopkins Univ., Charles and 34th Sts., 

 BALTIMORE, Md. 21218, U.S.A. 



a Biochemical studies on differentiation. Drosophila melanogasfer (Dipfera), Rana pipiens, 

 Xenopus laevis (Anura), Mus musculus (Rodentia) 



b Organization of imaginal discs. Drosophila melanogasfer (Dipfera) 



c Ultrastructure and enzymology of fertilization. Ascidia nigra (Tunicafa) 



VAAGE. S. M.D. — Anat. Inst., Univ. of Oslo, Karl Johansgt. 47, OSLO, Norway 



a Morphogenetic studies on cell migrations in the central nervous system of the embryo by 

 means of autoradiography. Gallus domesticus (Aves) 



VACEK, Z. MUDr., Dr.Sc. Prof. — Inst, of Embryol.. Fac. of Med., Charles Univ., Albertov 

 4, PRAGUE 2, Czechoslovakia 



a Electron microscopy and histochemistry of the placenta (comparative studies on the sub- 

 microscopic structure, enzyme histochemistry and transport mechanism). (Rodentia, 

 Carnivora, Insectivora, Chiropfera), Homo sapiens (Primates) 



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

 and cytochemical studies in normal and experimental conditions). Rana esculenfa (Anura). 

 Gallus domesticus (Aves), Mus rattus (Rodentia) 



VAHS, W. Dr.phil., Prof . — Zool. Inst, der Univ.. Weyertal 119, 5 KOLN-Lindenthal, 

 Deutsche Bundesrepublik 



a Quantitative cytochemistry of nucleic acids and proteins during induction and differentia- 

 tion. (Teleosfei; Urodela; Aves) 



b The role of the yolk platelets in the differentiation process. (Urodela) 



c Biochemistry of early development including yolk utilization. (Teleosfei; Amphibia) 



• VAKAET, L. C. A. M.D., Prof. — Lab. of Anat.. Fac. of Sci., State Univ. Center, Mid- 



delheimlaan 1. ANTWERPEN, Belgium 

 a Early development. Gallus domesticus (Aves) 

 b Fetal and neonatal endocrinology. Mus musculus albinus (Rodentia) 



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