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dc.contributor.authorCalarco, Ann Marie.en_US
dc.date.accessioned2009-06-09T18:16:33Z
dc.date.available2009-06-09T18:16:33Z
dc.date.issued1980-06-09T18:16:33Z
dc.identifier.urihttp://hdl.handle.net/10464/1580
dc.description.abstractThe relationship between photoperiod, plasma concentration of ionic calcium and the histology of the prolactin-secreting cells of the rostral pars distalis of the pituitary gland, the Corpuscles of Stannius and the Ultimobranchial gland were investigated. Neither the plasma concentration of ionic calcium nor histologically apparent prolactin cell activity could be correlated with photoperiod. Some evidence of a photoperiodic effect on both the Corpuscles of Stannius and the Ultimobranchial gland was obtained. The expected reciprocal relationship between the activity of these glands was not obvious at the histological level . Quantitative and qualitative analysis at the light microscope level revealed, however, that the hormone prolactin-secreting eta cells of the rostral pars distalis and the hypocalcin-secreting cells of the Corpuscles of Stannius may be arranged in a lamellar pattern comprized of synchronous bands of cells in like-phase of a secretory cycle consisting of four stages - synthesis, storage, release and reorganization. Such synchronized cell cycles in these glands have not heretofore been described in literature. It is suggested that the maintenance of at least 255? of the cells in any one phase of the cycle ensures a supply of the required hormone at all times.en_US
dc.language.isoengen_US
dc.publisherBrock Universityen_US
dc.subjectGoldfish.en_US
dc.subjectPhotoperiodism.en_US
dc.subjectPituitary gland.en_US
dc.subjectUltimobranchial body.en_US
dc.subjectHistology.en_US
dc.subjectCells.en_US
dc.subjectCalcium ions.en_US
dc.subjectSecretion.en_US
dc.titleRelationship between photoperiod, plasma concentration of ionic calcium and the histology of the prolactin-secreting cells of the rostral pars distalis of the pituitary gland, the corpuscles of stannius and the ultimobranchial gland in the goldfish, Carassius auratus L. /en_US
dc.typeElectronic Thesis or Dissertationen_US
dc.degree.nameM.Sc. Biological Sciencesen_US
dc.degree.levelMastersen_US
dc.contributor.departmentDepartment of Biological Sciencesen_US
dc.degree.disciplineFaculty of Mathematics and Scienceen_US


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