a Cytology of neonatal liver; differentiation of intercellular junctions, characters of micro- 

 bodies- histochemical differentiation. Miis musculus (Rodentia) (in collaboration with 

 R. POURHADI and P. MALET) ^,„^ 



TWEEDELL. K. S. Ph.D., Prof. — Dept. of Biol., Univ. of Notre Dame, NOTRE DAME, 



Ind. 46556, U.S.A. 

 a Oocyte development and incorporation of radioactive precursors. Pectinana gouldii {Foly- 



chaeta) 

 b Inhibition of hydranth regeneration. Tubidaria crocea (Hydroidea) 

 c Renal tumor induction by subcellular fractions in embryonic and larval stages. Rana 



pipiens (Anura) 

 TYLER A t Ph.D., Prof. — Dept. of Developm. Biol., Div. of Biol., Calif. Inst, of Technol., 

 PASADENA, Calif. 91109, U.S.A. 

 ( dcccBscd ) 

 TYLER, C. Ph.D., D.Sc, Prof. — Dept. of Physiol, and Biochem., The Univ., READING 



ROi 5AQ. England 

 a Structure and properties of the egg shell. (Aves) 

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



Nat. Univ., P.O. Box 4, CANBERRA, A.C.T. 2600, Australia 

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

 h Fine structure of the blastocyst. Macropus eugenii (Marsupialia), Oryctolagus cuniculus 



(Lagomorpha) 

 c Factors involved in resumption of development by blastocysts in diapause. Macropus 



eugenii (Marsupialia) 

 TYSZKIEWICZ, Mrs. K. M.Sc. — Zool. Dept., Jagiellonian Univ., ul.Krupnicza 50. 



KRAKOW, Poland 

 a Embryogenesis of nervous system. Tefrodontophora bielanensis (Collembola) 

 UBBELS, Miss G. A. Ph.D. — Hubrecht Lab. (Intemat. Embryol. Inst.), Uppsalalaan 1, 



Universiteitscentrum "De Uithof", UTRECHT, Netherlands 

 a Origin and significance of cytochemical heterogeneity of cell populations in the devel- 

 oping egg. Ambystoma mexicanum (Urodela). Xenopus laevis (Anura) 

 b Histochemical and autoradiographical analysis of neural and mesodermal competence in 

 the blastula/gastrula stage. Ambystoma mexicanum (Urodela) (in collaboration with 

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

 c Cytochemical analysis of oogenesis and early development. Gryllus domesficus, Locusta 



migraforia (Orthoptera) 

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

 a Studies on reproduction and embryology. Pipistrellus abramus. Miniopterus schreibecsi 



(Chiropfera) 

 UEMURA, I. — Embryol. Sect., Dept. of Biol., Tokyo Metropolitan Univ., 2-1-1 chome, 



Fukazawa-machi, Setagaya-ku, TOKYO, 158 Japan 

 a Electron microscopic studies on the development of primary mesenchyme cells. Hemicen- 



trotus pulcherrimus (Echinoidea) 

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



K.Marxe 157, PRAHA-Podoh, 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 scrufa (Artiodacfyla) 

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

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

 dactyla) 

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



Oryctolagus cuniculus (Lagomorpha), Ovis aries, Sus scrofa (Artiodactyla) 

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



U.K. 

 a Autoradiography of ovarioles. Tenebrio molitor (Coleoptera) 

 h Oogenesis in vitro. Tenebrio molitor (Coleoptera) 

 ULRICH, E. Dipl.Phil.II. — Zool.-Vergl. Anat. Inst., Univ. Zurich, Kiinstlergasse 16, 8006 



ZURICH, Switzerland 

 a Cell heredity and determination in male and female genital discs (methods: transplantation 



and somatic crossing over). Drosophila melanogaster (Diptera) 

 ULRICH, H. Dr.phil., Prof. — Dept. of Zool., Swiss Fed. Inst, of Technol., Universitatstr. 2, 



8006 ZURICH, Switzerland 

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



melanogaster (Diptera) 

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

 opeza pygmaea (— Oligarces paradoxus), Miastor metraloas (Itonididae = Cecidomyiidae, 

 Diptera) ^^^ 



UPPULURI, V. R. R. Dr. — Biol. Div., Oak Ridge Natl. Lab., P.O. Box Y, OAK RIDGE, 

 Tenn. 37830, U.S.A. 



177 



