a The role of intercellular communication and membrane permeability in early embryonic differ- 

 entiation 

 TWEEDELL, K. S.; Ph.D., Prof. - Dept. of Biol., Univ. of Notre Dame, NOTRE DAME, Ind. 46556, 



U.S.A. ISDB 



a Oocyte development and incorporation of radioactive precursors. Pectinaria gouldii (Polychaeta) 

 b Cell source and movement during hydranth regeneration. Tubularia crocea (Hydrozoa) 

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



(Anura) 

 d Tissue and organ culture of embryonic and neoplastic cells. Same species as c 

 TWEEDLE, Ch. D.; Ph.D. - Depts. of Biomech. and Zool., Coll. of Nat. Sci., Mich. State Univ., EAST 



LANSING, Mich. 48824, U.S.A. 

 a Formation of neuromuscular junctions in developing muscle. Ambystoma maculatum (Urodela) 

 b Nerve effects on myogenesis and limb regeneration. Same species as a 

 c Collateral nerve sprouting in injured muscle. (Mammalia) 

 TYNDALE-BISCOE, C. H.; Ph.D. - Dept. of Zool., Austr. Natl. Univ., P.O. Box 4, CANBERRA, 



A.C.T. 2600, Australia 

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

 b Fine structure of the blastocyst. Macropus eugenii (Marsupialia), Oryctolagus cuniculus (Lago- 



morpha) 

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



(Marsupialia) 

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

 a Reproduction and embryology. Pipistrellus abramus, Miniopterus schreibersi (Chiroptera) 

 b Electron microscopic analysis of fertilization. Same species as a 

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



machi, Setagaya-ku, TOKYO, 158 Japan, 

 a Electron microscopy of the development of primary mesenchyme cells. Hemicentrotus pulcherri- 



mus (Echinoidea) 

 b Electron microscopy of calcification in the embryo. Arbacia punctulata (Echinoidea) 

 c Electron microscopy of cortical changes in early embryology. Same species as a 

 UMETANI, T.; M.D. - Dept. of Anat., Div. I, Kobe Univ., Kusunoki-cho, Ikuta-ku, KOBE, 650 Japan 

 a Phylogenetic and ontogenetic studies on the spinal cord and its fine structure. (Vertebrata) 

 UNSWORTH, B.R.; Ph.D. - Dept. of Biol., Marquette Univ., 530 N. 15th St., MILWAUKEE, 



WI 53233, U.S.A. 

 a Specific RNA and protein synthesis during kidney tubulogenesis; control mechanisms acting in 



early stages of secondary induction; characterization of a neural factor responsible for tubule 



initiation. Mus musculus (Rodentia) 

 b In vitro differentiation of mammary carcinoma in response to certain embryonic tissues. Same 



species as a 

 c Brain differentiation; correlation between tetrodotoxin binding and brain function; comparison 



of development in two phyla. Gallus domesticus (Aves), Mus musculus (Rodentia) 

 UPHOLT, W. B.; Ph.D. - Dept. of Embryol., Carnegie Inst, of Wash., 115 W. University Parkway, 



BALTIMORE, Md. 21210, U.S.A. 

 a Regulation of synthesis of nuclear and mitochondrial nucleic acids during early development. 



Rana pipiens, Xenopus laevis (Anura) (with I. B. DAWID) 

 b Properties of recombinant mitochondrial DNA in hybrid somatic cells. Mus musculus (Rodentia), 



Homo sapiens_(Primates) 

 URANO, Mrs. S. OHASHI - Embryol. Sect., Dept. of Biol., Tokyo Metropolitan Univ., 2-1-1 



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

 a Cell differentiation. (Echinoidea) 



URBAN, P.; Ph.D. - Dept. of Biol. Sci., Union Coll., SCHENECTADY, NY 12308, U.S.A. 

 URIST, M. R.; M.D. - Bone Res. Lab., Univ. of Calif., 1000 Veteran Ave., Rm. A3-34, LOS 



ANGELES, Calif. 90024, U.S.A. 

 a Bone morphogenesis: the physiology and biochemistry of bone matrix in health and disease; the 



regulation of bone generation, growth and regeneration by a new enzyme system, BMP-BMPase. 



(Mammalia) 

 b Calcification and ossification. (Mammalia) 



UYSAL, M.;M.D. - Inst, of Histol. and Embryol., Med. Fac, Hacettepe Univ., ANKARA, Turkey 

 a Collagenogenesis in the umbilical cord. Homo sapiens (Primates) 

 VACQUIER, V. D.; Ph.D. - Zool. Dept., Univ. of Calif., DAVIS, Ca. 95616, U.S.A. 

 a The morphology and biochemistry of fertilization (beta-1, 3-glucanohydrolase and other 



enzymes). (Echinoidea) 

 b Mechanisms involved in the physical interactions of blastomeres during cleavage. (Echinoidea) 

 VALDEZ TOLEDO, Mrs. C. L. - Inst, de Biol., Univ. Nac. de Tucuman, Chacabuco 461, S.M. de 



TUCUMAN, Argentina 

 a Anaerobiosis in oocytes. Bufo arenarum (Anura) 

 VANABLE, J. W., Jr.; Ph.D., Assoc. Prof. - Dept. of Biol. Sci., Purdue Univ., W. LAFAYETTE, Ind. 



47907, U.S.A. 

 a The possibility of selectivity in neuromuscular associations: extrinsic ocular muscles. Xenopus 



laevis (Anura) 

 b Visual mutants as a tool to study eye development. Mus musculus (Rodentia) 

 VAN ALTEN, P. J.; Ph.D., Assoc. Prof. - Dept. of Anat., Coll. of Med., Univ. of Illinois, P.O. 



Box 6998, CHICAGO, 111. 60680, U.S.A. 

 a Ontogeny of the immunological mechanism. Gallus domesticus (Aves) 



89 



