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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

The roles of Pax6 in neural precursor migration and axon guidance

Stoney, Patrick Niall January 2009 (has links)
The ability of migrating neurons and growth cones to navigate through their environment is crucial for the correct development of the brain. Cells and growth cones may be guided by electrical, chemical or topographical cues in their environment. Pax6 is a transcription factor vital for brain development. Pax6-/- mutant mice die perinatally with defects in neuronal proliferation and differentiation, cortical cell migration and axon guidance, yet it is not clear which guidance cues Pax6-/- mutant neurons fail to interpret. Dissociated cultured cells were used to study the cell-autonomous effects of Pax6 mutation on guidance of growth cones and migrating neural precursors by environmental cues. Neurites from mouse embryonic cortical neurons aligned perpendicular to 1 μm-wide, 130 nm-deep substratum grooves. Pax6-/- mutation abolished contact-mediated neurite guidance by these grooves. Laminin induced a switch from perpendicular to parallel alignment to grooves, via a β1 integrin-independent mechanism. Blocking cAMP signalling abolished perpendicular alignment to polylysine-coated grooves, but enhanced parallel alignment to laminin-coated grooves. Pax6 null mutation or overexpression also caused specific defects in contact-guided migration by cortical cells. An electric field applied to E16.5 cortical neurons increased the frequency of extension of neurites aligned perpendicular to the field axis. Pax6-/- mutant cells responded to an electric field with reduced anodal extension, but no significant increase in perpendicular neurite extension. Electrical cues were prioritised over topographical cues when presented in combination. Taken together, data suggest that Pax6 mutant cortical cells do not completely lack the ability to detect extracellular guidance cues, but they respond differently to wild-type cells. In combination with other defects identified in the cortex, this may contribute to the cell migration and axon guidance phenotypes in the brain of the Pax6-/- embryo. This study also identified novel Pax6 expression in the trigeminal ganglion, where it may regulate axon guidance and neurogenesis.
2

CA2+-Dependent K+ currents underlying the AHP in hippocampal CA1 neurons /

Bui, Huyen, January 2006 (has links)
Thesis (Ph.D.) -- University of Texas at Dallas, 2006. / Includes vita. Includes bibliographical references (leaves 81-94)
3

Neural stem cells and their contribution to neurogenesis in the adult mammalian brain /

Momma, Stefan, January 2002 (has links)
Diss. (sammanfattning) Stockholm : Karol. inst., 2002. / Härtill 4 uppsatser.
4

The relationship between mesocerebral activity and sexual arousal in the snail, Cornu aspersum

Tajerian, Maral. January 1900 (has links)
Thesis (M.Sc.). / Written for the Dept. of Biology. Title from title page of PDF (viewed 2008/05/29). Includes bibliographical references.
5

Chloride-cotransport modulation of synchronous epileptiform discharge /

Hochman, Daryl W. January 1999 (has links)
Thesis (Ph. D.)--University of Washington, 1999. / Vita. Includes bibliographical references (leaves 88-105).
6

Protective effects of polysaccharides extracted from morinda officinalis on fetal rat hippocampal neurons

Zhang, Ruoyi. January 2010 (has links)
Thesis (M. Phil.)--University of Hong Kong, 2010. / Includes bibliographical references (leaves 139-161). Also available in print.
7

Protective effects of icariin extracted from epimedii herba on fetal rat hippocampal neurons

Zou, Liangliang. January 2009 (has links)
Thesis (M. Phil.)--University of Hong Kong, 2010. / Includes bibliographical references (leaves 95-112). Also available in print.
8

Modulating effects of Chinese green tea on hippocampal neurons against glutamate neurotoxicity and hippocampal dependent memory during aging in mice

Fu, Yu, January 2005 (has links)
Thesis (M. Phil.)--University of Hong Kong, 2005. / Title proper from title frame. Also available in printed format.
9

Neuronal nicotinic receptor subtypes in normal ageing, Alzheimer's disease and schizophrenia : influences of neuropathological mechanisms as studied in human autopsy brain and transgenic mice /

Marutle, Amelia, January 2002 (has links)
Diss. (sammanfattning) Stockholm : Karolinska institutet, 2002. / Härtill 5 uppsatser.
10

Cellular level/distribution of [gamma]-secretase subunit nicastrin and its modulator p23 in the brain

Kodam, Anitha. January 2010 (has links)
Thesis (M.Sc.)--University of Alberta, 2010. / A thesis submitted to the Faculty of Graduate Studies and Research in partial fulfillment of the requirements for the degree of Master of Science, Department of Psychiatry. Title from pdf file main screen (viewed on February 14, 2010). Includes bibliographical references.

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