YorkSpace has migrated to a new version of its software. Access our Help Resources to learn how to use the refreshed site. Contact diginit@yorku.ca if you have any questions about the migration.
 

Investigation of the Factors Regulating Ecdysteroid Release By Ovaries From Adult Female Rhodnius Prolixus During Egg Development

Simple item page
dc.contributor.advisorDonini, Andrew
dc.creatorDurant, Andrea Claire
dc.date.accessioned2016-09-20T16:37:25Z
dc.date.available2016-09-20T16:37:25Z
dc.date.copyright2015-11-20
dc.date.issued2016-09-20
dc.date.updated2016-09-20T16:37:24Z
dc.degree.disciplineBiology
dc.degree.levelMaster's
dc.degree.nameMSc - Master of Science
dc.description.abstractEcdysteroids are released in rhythmic fashion from ovaries during egg development in Rhodnius prolixus. Transfer of ovaries from arrhythmic (LL ) animals to continuous darkness in vitro did not stimulate ecdysteroid release. PERIOD (PER) protein was observed in follicle cells of the ovary only at specific stages of oocyte development in both entrained (LD) and arrhythmic (LL) animals arguing against the presence of an endogenous ovarian clock. I showed that whole and fractionated brain extracts stimulated ecdysteroid release by ovaries from both LD and LL animals. The low molecular weight fraction (containing insulin-like peptides, ILPs) was tenfold more potent than the high molecular weight fraction (containing prothoracicotropic hormone, PTTH). None of recombinant PTTH, vertebrate insulins or corazonin had any significant stimulatory effect on ovarian ecdysteroid release. The circadian rhythm of ecdysteroid release by ovaries appears to be driven exogenously, probably by rhythmic release of unidentified hormones.
dc.identifier.urihttp://hdl.handle.net/10315/32168
dc.language.isoen
dc.rightsAuthor owns copyright, except where explicitly noted. Please contact the author directly with licensing requests.
dc.subjectEndocrinology
dc.subject.keywordsRhodnius prolixus
dc.subject.keywordsInsect reproduction
dc.subject.keywordsInsect physiology
dc.subject.keywordsCircadian rhythms
dc.subject.keywordsInsect reproduction
dc.subject.keywordsProthoracicotropic hormone (PTTH)
dc.subject.keywordsInsulin-like peptide (ILP)
dc.subject.keywordsEcdysteroids
dc.subject.keywordsPERIOD (PER)
dc.titleInvestigation of the Factors Regulating Ecdysteroid Release By Ovaries From Adult Female Rhodnius Prolixus During Egg Development
dc.typeElectronic Thesis or Dissertation

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Durant_Andrea_C_2015_MSc.pdf
Size:
1.83 MB
Format:
Adobe Portable Document Format
Description:
Download
License bundle
Now showing 1 - 2 of 2
No Thumbnail Available
Name:
license.txt
Size:
1.83 KB
Format:
Plain Text
Description:
Download
No Thumbnail Available
Name:
YorkU_ETDlicense.txt
Size:
3.38 KB
Format:
Plain Text
Description:
Download

Collections

Biology

All items in the YorkSpace institutional repository are protected by copyright, with all rights reserved except where explicitly noted.