PARIVAR, K.; Ph.D. - Biol. Dept., Sch. of Sci., Ferdowsi Univ., MASHHAD, Iran 



a Biology of reproduction. Melanopsis praemorsa (Gastropoda) 



b Comparative study on the role of steroidogenesis in Sertoli cells. Rattus spec, Cavia porcellus 

 (Rodentia), Homo sapiens (Primates) 



PARK, K. E.: D.Agr. - Dept. of Sericult., Coll. of Agric, Seoul Natl. Univ., SUWEON, 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, 

 USA 



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



a Morphology, histochemistry and biochemistry of oocyte growth and embryology (Acanthoce- 

 phala) (with S. S. GURAYA) 



b Morphology, histochemistry, biochemistry and physiology of gametogenesis and early embryol- 

 ogy. (Platyhelminthes) (with S. S. GURAYA) 



PAYNTON, Ms. B. V.; B.Sc. - Dept. of Anat., Jefferson Med. Coll., 1020 Locust St., PHILADEL- 

 PHIA, PA 19107. USA 



a Alterations in glycosaniinoglycan metabolism during chondrogenesis in fetuses from mothers 

 administered 9-methyl-pteroyl glutamic acid (folate antagonist) in vivo and in vitro. Rattus 

 norvegicus (Rodentia) 



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

 VELAND, OH 44118, USA 



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

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

 belled antibodies). Gallus domesticus (Aves) 



PELLEG A : Ph.D. - Dept. of Physiol., Sch. of Med., Univ. of Virginia, CHARLOTTESVILLE, 

 VA 22903, USA 



a Electrophysiology and biochemistry of cultured heart cells and developing hearts. Gallus domes- 

 ticus (Aves), Rattus spec, Cavia porceUus (Rodentia) 



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



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



b Effects and mode of action of "anti-juvenile hormones" on metamorphosis and reproduction. 

 Locusta migratoria, Schistocerca amcricana gregaria (Orthoptera) 



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

 BETHESDA, MD 20014. USA 



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

 OK 73069, USA 



a Effects of ionic ratios and osmotic concentrations on ameba-to-flagellate transtormation. Nae- 

 gleria gruberi (RJiizopoda) 



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

 730 William Ave., WINNIPEG, Man. R3E 0W3, Canada 



a Teratological studies with prostaglandins and inhibitors of prostaglandin synthesis; involve- 

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

 spec. (Rodentia), Oryctolagus cuniculus (Lagomorpha) 



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

 chemistry). Rattus norvegicus (Rodentia) 



c Use of the embryo in vitro for embryological and teratological studies. Mus musculus, Rattus 

 norvegicus (Rodentia) 



d Drug interactions during pregnancy: maternal and fetal toxicity. Same species as c 



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

 USA 



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

 in the central nervous system. Rattus domesticus (Rodentia) 



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



PETERSON, R. C; Pli.D. - Dept. of Embryol., Carnegie Inst, of Washington, 115 W. University 

 Parkway, BALTIMORE, MD 21210, USA 



a Isolation and characterization of genes coding for somatic type 5S RNA. Xenopus laevis (Anura) 



b Proteins and other factors which allow specific expression of either the oocyte or somatic genes 

 for 5S RNA. Same species as 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 



c Structure and development of root cap. Isoetes spec, Selaginella spec. (Lycopodiophyta), Ephe- 

 dra spec. (Ephedraceae) 



d Ontogeny and structure of stomatal guard cells. Ophioglossum petiolatum (FiUces) 

 PEUSNER, Ms. K. D.; Ph.D. - Dept. of Anat., Jefferson Med. Coll., 1020 Locust St., PHILADEL- 

 PHIA, PA 19107, USA 



a Ultrastructural changes preceding and during synaptic development of the axosomatic "spoon 



endings" in the tangential nucleus, a part of the lateral vestibular complex. Gallus gallus (Aves) 

 PHILLIPS D M.; Ph.D. - Biomed. Div., The Popul. Council, Rockefeller Univ., York Ave. and 66th 

 St., NEW YORK. NY 10021, USA. 



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