PAPACONSTANTINOU, J.; Ph.D. - Biol. Div., Oak Ridge Natl. Lab., P.O. Box Y, OAK RIDGE, 



TN 37830, U.S.A. 

 a Regulation of gene expression, especially tissue specific protein synthesis (albumin, alpha- 



fetoprotein, hemoglobin) in tissue and organ culture. Mouse hepatoma. Friend leukemia 

 PAPPANO, A. J.; Ph.D., Assoc. Prof. - Dept. of Pharmacol., Health Ctr., Univ. of Connecticut, 



FARMINGTON, CT 06032, U.S.A. 

 a Morphological development of autonomic heart innervation (fluorescent histochemical method 



of Falck l"or identification of adrenergic nerves); ultrastructure of cholinergic and adrenergic 



innervation of the sinoatrial pacemaker (transmission electron microscopy); functional develop- 

 ment of autonomic ncuroeffector transmission (electrophysiologic and pharmacologic methods). 



Callus domesticus (Aves) 

 b Cliange in ion current responsible for excitation in the embryonic heart electrophysiology 



(inhibitors of ion current flow). Same species as a 

 PARK, K. £.; D.Agr. - Dept. of Sericult., Coll. of Agric, Seoul Natl. Univ., SUWON, South Korea 

 a Diapause substance analysis by means of tissue culture. Bombyx mori (Lepidoptera) 

 PARKENING, T. A.; Ph.D. - Dept. of Anat., Med. Branch, Univ. of Texas, GALVESTON, TX 77550, 



U.S.A. 

 a Unfertilized eggs are frozen to -75° C and liquid nitrogen temperatures; upon thawing they are 



fertilized in vitro, cultured to the blastocyst stage and then transferred into recipient females. 



Oryctolagus cuniculus (Lagomorpha), Canis familiaris (Carnivora), Bos taurus (Artiodactyla), 



(Invertebrata) 

 b In vitro fertilization to determine if gametes of different strains interact with one another, and if 



the cues are as readily fertiUzed as those of pure strain pairings. Mus musculus (Rodentia) 

 PARSHAD^V. R.; Dr. - Dept. of Zool., Punjab Agric. Univ., LUDHIANA, Punjab, India 

 a Morphology, histocliemistry and biochemis"try of oocyte growth and of embryology. (Acan- 



thocephala) (with S. S. GURAYA) 

 PATEL, N. D.; M.Sc. - Dept. of Bot., Sardar Patel Univ., VALLABH VIDYANAGAR 388120, 



Gujarat, India 

 a Developmental morphology and histochemistry of fruits. Datura spp., Withania spp., Capsicum 



spp., Physalis spp., Solanum spp., Cestrum spp. and others (Solanaceae) 

 PEARCE, Th. L.; Ph.D., Assoc. Prof. - Dept. of Biol., John Carroll Univ., University Heights, 



CLEVELAND, OH 441 18, U.S.A. 

 a Effects of inhibitors of mitosis (e.g. colcemid) and DNA synthesis (e.g. 5-bromodeoxyuridine) on 



the appearance of crystallins in the lens placode (immunofluorescence and peroxidase-labelled 



antibodies). Gallus domesticus (Aves) 

 PEDERNERA, E. A.; Dr.Med. - Dept. de Histol. y Embriol., Univ. Nac. de Rosario, Santa Fe 3100, 



ROSARIO, Argentina 

 PENER, M. P.; Ph.D., Prof. - Dept. of Entomol., Hebrew Univ., JERUSALEM, Israel 

 a Hormonal effects on oocyte development and egg-laying. Various spp. (Acrididae, Orthoptera) 

 PENMAN, S. - Dept. of BioL, Massachusetts Inst, of Technol., CAMBRIDGE, MA 02139, U.S.A. 

 PENNYPACKER, J. P.; Ph.D. - Natl. Inst, of Dent. Res., Bldg. 30, Rm. 414, Natl. Inst, of Health, 



BETHESDA, MD 20014, U.S.A. 

 a Vitamin A effects on limb bud cells undergoing chondrogenesis in vitro. Mus musculus 



(Rodentia) 

 b Cartilage abnormalities in mutants. Same species as a 

 PERKINS, b. L.; Ph.D. - Dept. of Zool., Univ. of Oklahoma, 730 Van Vliet Oval, NORMAN, 



OK 73069, U.S.A. 

 a The effects of high hydrostatic pressure on ameba-to-flagellate transformation. Naegleria gruberi 



(Rhizopoda) 

 b The effects of ionic ratios and osmotic concentrations on the ameba-to-tlagellate transformation 



and the pseudomating reaction. Naegleria gruberi (Rhizopoda), Spirostomum ambiguum (Ciliata) 

 PERSAUD T. V. N.; M.D., Ph.D., Prof. - Teratol. Res. Lab., Dept. of Anat., Univ. of Manitoba, 750 



Bannatyne Ave., WINNIPEG, Man. R3E 0VV3, Canada 

 a Teratological studies with prostaglandins and inhibitors of prostaglandin synthesis; involvement 



of prostaglandins in developmental processes. Gallus spec. (Aves), Mus musculus, Rattus spec. 



(Rodentia), Oryctolagus cuniculus (Lagomorpha) 

 b Fetal toxicity of metals,in particular aluminium. Mus musculus, Rattus spec. (Rodentia), 



Oryctolagus cuniculus (Lagomorpha) 

 c Ontogenetic pattern of enzymes in normal and abnormal development (histochemistry, bio- 

 chemistry). Rattus norvegicus (Rodentia) 

 PETERS, A.; Ph.D., Prof. - Dept. of Anat., Boston Univ., 80 E. Concord St., BOSTON, MA 02118, 



U.S.A. 

 a Electron microscopy of the formation of myelin sheaths and development ot neuroglial cells in 



the central nervous system. Rattus domesticus (Rodentia) 

 b Electron microscopy of the cerebral cortex. Same species as a 

 PETERS, J. J.; Ph.D., Prof. - Dept. of BioL, Xavier Univ., Victoria Parkway, CINCINNATI, 



OH 45207, U.S.A. 

 PETERSON, R. L.; Ph.D., Assoc. Prof. - Dept. of Bot. and Genet., Univ. of Guelph, GUELPH, Ont. 



NIG 2W1, Canada 

 a Ontogeny and factors controlling initiation and outgrowth of buds on roots. Hieracium floren- 



tinum (Compositae) 

 b Nutritional factors controlling the initiation of transfer cells adjacent to xylem and phloem at 



base of lateral roots. Same species as a 



69 



