Quentin M. Geiman
University of Pennsylvania
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Featured researches published by Quentin M. Geiman.
Parasitology | 1936
Quentin M. Geiman; Herbert L. Ratcliffe
The morphology and life cycle of an amoeba producing amoebiasis in reptiles is described. The organism is assigned to the species Entamoeba invadens Rodham 1934, because of the pathogenicity of that species. Material for the study was derived from 30 individuals of 7 species of reptiles, either dying of spontaneous amoebiasis or experimentally infected. (Material from 3 additional species of reptiles dying of amoebiasis was not used in this study.) With the exception of a few minor morphological differences, E. invadens was found to be strikingly similar to E. histolytica in morphology of trophic and cystic stages, and in the processes of encystation, excystation, and metacystic development. Metacystic development was studied in stained preparations made from the intestines of snakes 1–24 hours after the inoculation by mouth of mature cysts. Excystation usually takes place in the jejunum and ileum, a single quadrinucleate amoeba hatching from each cyst. Each quadrinucleate metacystic amoeba ultimately forms 8 amoebulae as a result of one division of each cystic nucleus, cytoplasmic division, and parcelling out of the cystic ( N ) and daughter ( n ) nuclei. Nineteen of the 24 possible combinations of N and n nuclei were observed. The culture phenomena of multiple fission without encystment is suggested, and cannibalism of cysts by the trophozoites is described.
Journal of Parasitology | 1972
Wasim A. Siddiqui; Jerome V. Schnell; Quentin M. Geiman
PRASSE, J. 1967. Zur Anatomie und Histologie der Acaridae mit besonderer Beriicksichtigung von Caloglyphus berlesei (Michael 1903) und C. michaeli (Oudemans 1924); I. Das Darmsystem. Wiss. Ztschr. Univ. Halle. 5: 789812. RICHARDS, A. G., AND P. A. RICHARDS. 1971. Origin and composition of the peritrophic membrane of the mosquito, Aedes aegypti. J. Insect Physiol. 17: 2253-2275. VAN BRONSWIJK, J. E. M. H., AND R. N. SINHA. 1971. Pyroglyphid mites (Acari) and house dust allergy. J. Allerg. 46: 31-52. WHARTON, G. W., AND L. G. ARLIAN. 1972. Predatory behavior of the mite Cheyletus aversor. Anim. Behav. In press. ZACHVATKIN, A. A. 1959. Fauna of U.S.S.R., Arachnoidea. 473 p. Translated from Russian for AIBS, Washington, D. C., by A. Ratcliffe and A. M. Hughes. BRONSWIJK, J. E. M. H., AND R. N. SINHA. . Pyroglyphid mites (Acari) and house a lergy. J. Allerg. 46: 31-52.
Journal of Experimental Medicine | 1946
Ralph W. McKee; Richard A. Ormsbee; Christian B. Anfinsen; Quentin M. Geiman; Eric G. Ball
Journal of Experimental Medicine | 1946
Christian B. Anfinsen; Quentin M. Geiman; Ralph W. McKee; Richard A. Ormsbee; Eric G. Ball
Science | 1945
Eric G. Ball; Christian B. Anfinsen; Quentin M. Geiman; Ralph W. McKee; Richard A. Ormsbee
American Journal of Tropical Medicine and Hygiene | 1972
Wasim A. Siddiqui; Jerome V. Schnell; Quentin M. Geiman
American Journal of Tropical Medicine and Hygiene | 1970
Wasim A. Siddiqui; Jerome V. Schnell; Quentin M. Geiman
Science | 1934
Herbert L. Ratcliffe; Quentin M. Geiman
Journal of Parasitology | 1970
Wasim A. Siddiqi; Jerome V. Schnell; Quentin M. Geiman
Journal of Morphology | 1935
Quentin M. Geiman