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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

Functions of nogo in the development of mouse retinofugal pathway. / CUHK electronic theses & dissertations collection

January 2005 (has links)
Nogo is well established for its inhibitory action on axon regeneration in the adult central nervous system. It binds to the Nogo receptor (NgR) through an extracellular active site on the protein-Nogo-66. Although it is reported that Nogo is widely expressed in the developing brain, its exact function during development of the nervous system is unclear. / The contribution of Nogo on patterning the axon routing at the optic chiasm of mouse embryo was investigated in this thesis. Using immunocytochemical staining, Nogo protein was localized on the Miller glial cells in the retina and at the optic disk. A few migrating retinal neurons also expressed Nogo. In the chiasm, Nogo was localized exclusively on the radial glia, which generate a midline domain where turning of uncrossed axons occurs. In vitro study showed expression of NgR on retinal neurites and growth cones, and neurite outgrowth from both dorsal nasal (contralaterally projecting) and ventral temporal (ipsilaterally projecting) retina was inhibited by Nogo. In the pathway, NgR expression was regionally regulated. NgR was obvious in the optic stalk and the optic tract, but not in the chiasm. Blocking Nogo function with NEP1-40, a peptide antagonist of NgR, in brain slice culture of the pathway produced significant reduction in the uncrossed projection, but had no effect on axon crossing at the midline. Furthermore, the age related fiber arrangement in the optic tract was abolished after disturbing of Nogo function. Similar abnormalities were observed in slices treated with Nogo blocking antibody. In vitro studies showed that NEP1-40 rescued the inhibition of Nogo to the retinal neurites. The downregulation of NgR at the chiasm was supported by in vitro assays showing significant reduction of receptor expression on dorsal nasal but not ventral temporal growth cones when they encountered the chiasm, thus generating a differential inhibition to ventral temporal neurites. / These results provide evidences that Nogo is a guidance molecule during the development of CNS. Interaction of Nogo and its receptor plays important role for patterning the axon divergence in the mouse optic pathway and the age related fiber order in the optic tract. / Wang Jun. / "September 2006." / Adviser: Sun-On Chan. / Source: Dissertation Abstracts International, Volume: 68-03, Section: B, page: 1474. / Thesis (Ph.D.)--Chinese University of Hong Kong, 2006. / Includes bibliographical references (p. 130-142). / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Electronic reproduction. [Ann Arbor, MI] : ProQuest Information and Learning, [200-] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Abstracts in English and Chinese. / School code: 1307.
2

Regulations of axon routings at the optic chiasm of mouse embryos.

January 1999 (has links)
Chung Kit Ying. / Thesis (M.Phil.)--Chinese University of Hong Kong, 1999. / Includes bibliographical references (leaves 90-104). / Abstracts in English and Chinese. / Chapter Chapter 1 --- General Introduction --- p.1-22 / Chapter Chapter 2 --- Expression of Chondroitin Sulfate Proteoglycans (CSPGs) in the Chiasm of Mouse Embryos / Introduction --- p.23-24 / Materials and Methods --- p.25 -27 / Results --- p.28-33 / Discussion --- p.34-40 / Figures --- p.41-45 / Chapter Chapter 3 --- Effects on Axon Routing after Removal of Chondroitin Sulfate Proteoglycans by Enzymatic Digestion / Introduction --- p.46 -47 / Materials and Methods --- p.48 -50 / Results --- p.57 / Discussion --- p.57-61 / Figures --- p.62-66 / Chapter Chapter 4 --- Immediate Effects of Prenatal Monocular Enucleation on the Cellular and Molecular Environment in the Development of Retinofugal Pathway / Introduction --- p.67-69 / Materials and Methods --- p.70-72 / Results --- p.73.77 / Discussion --- p.78-82 / Figures --- p.83-86 / Chapter Chapter 5 --- General Conclusion --- p.87-89 / References --- p.90 -104
3

Axon patterning in the mouse retinofugal pathway.

January 2002 (has links)
Leung Kin Mei. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2002. / Includes bibliographical references (leaves 106-125). / Abstracts in English and Chinese. / Chapter CHAPTER 1 --- GENERAL INTRODUCTION --- p.1-11 / Chapter CHAPTER 2 --- ENZYMATIC REMOVAL OF CHONDROITIN SULFATES ABOLISHES THE AGE-RELATED ORDER IN THE OPTIC TRACT OF MOUSE EMBRYOS / INTRODUCTION --- p.12-13 / MATERIALS AND METHODS --- p.13-18 / RESULTS --- p.18-24 / DISCUSSION --- p.24-29 / FIGURES --- p.30-39 / Chapter CHAPTER 3 --- EXPRESSION OF PHOSPHACAN AND NEUROCAN IN THE DEVELOPING MOUSE RETINOFUGAL PATHWAY / INTRODUCTION --- p.40-42 / MATERIALS AND METHODS --- p.42-43 / RESULTS --- p.44-49 / DISCUSSION --- p.49-55 / FIGURES --- p.56-61 / Chapter CHAPTER 4 --- HEPARAN SULFATE PROTEOGLYCAN EXPRESSION IN THE OPTIC CHIASM OF MOUSE EMBRYOS / INTRODUCTION --- p.62-63 / MATERIALS AND METHODS --- p.63-65 / RESULTS --- p.66-70 / DISCUSSION --- p.70-76 / FIGURES --- p.77-82 / Chapter CHAPTER 5 --- EXPRESSION OF NEURAL CELL ADHESION MOLECULES IN THE CHIASM OF MOUSE EMBRYOS / INTRODUCTION --- p.83-85 / MATERIALS AND METHODS --- p.85-88 / RESULTS --- p.88-92 / DISCUSSION --- p.92.95 / FIGURES --- p.96-102 / Chapter CHAPTER 6 --- GERNEAL CONCLUSION --- p.103-105 / REFERENCES --- p.106-125
4

Factors influencing retinal axon pathfinding in developing mouse retinofugal pathway.

January 2008 (has links)
Chan, Chung Kit. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2008. / Includes bibliographical references (leaves 98-110). / Abstracts in English and Chinese. / Abstract --- p.i / Abstract in Chinese --- p.iv / Acknowledgements --- p.v / Table of Abbreviations --- p.vi / Table of Contents --- p.vii / Chapter Chapter 1 --- General Introduction --- p.1 / Chapter Chapter 2 --- Functions of hyaluronan in the development of retinofugal pathway / Introduction --- p.18 / Materials and Methods --- p.19 / Results --- p.23 / Discussion --- p.26 / Figures --- p.32 / Chapter Chapter 3 --- Characterization of Nogo and its receptor in retinofugal pathway using Western blot analysis / Introduction --- p.40 / Materials and Methods --- p.42 / Results --- p.50 / Discussion --- p.52 / Figures --- p.57 / Chapter Chapter 4 --- Expression patterns and functions of Sonic hedgehogin retinofugal pathway / Introduction --- p.62 / Materials and Methods --- p.64 / Results --- p.69 / Discussion --- p.76 / Figures --- p.81 / Chapter Chapter 5 --- General Discussion --- p.91 / Figures --- p.95 / References --- p.98
5

The Prominence of Hebrew Syntax in Leonard Bernstein's "Chichester Psalms"

Finch, Scott Matthew January 2011 (has links)
Leonard Bernstein (August 25, 1918-October 14, 1990) had a fascination with language that was clear to his family from his childhood. He was raised in a Jewish home with parents who fostered an understanding of the Hebrew language as well as musical artistry. By the time he was commissioned to compose Chichester Psalms for the Chichester Cathedral in 1965, his understanding of Hebrew poetry was considerable. Bernstein’s compositional approach in this work was influenced not only by his musical training but also by his heritage and culture, including his literary knowledge. Scholars have explored the diversity of styles and text-painting in the Chichester Psalms. This author’s intent is to provide analysis of Bernstein’s use of Hebrew poetic forms to organize his composition. His understanding of Hebrew syntax is apparent in his sequencing and arrangement of the texts. In his careful and creative approach to setting these texts, Bernstein is able to highlight the themes of peace and unity that are the focus of the chosen verses in their original form.
6

Axon guidance in the development of mammalian retinofugal pathways.

January 1997 (has links)
Kong Fung Wong. / Thesis (M.Phil.)--Chinese University of Hong Kong, 1997. / Includes bibliographical references (leaves 59-70). / Chapter CHATPER 1 --- GENERAL INTRODUCTION --- p.1-12 / Chapter CHATPER 2 --- EXAMINATION OF THE BEHAVIOR OF GROWTH CONE IN DIFFERENT REGIONS OF THE OPTIC CHIASM / Introduction --- p.13-14 / Materials and Methods --- p.15-18 / Results --- p.19-23 / Discussion --- p.24-27 / Chapter CHATPER 3 --- STUDY OF BINOCULAR INTERACTION AFTER UNILATERAL INTRA-UTERO ENUCLEATION / Introduction --- p.28-29 / Materials and Methods --- p.30-31 / Results --- p.32-35 / Discussion --- p.36-39 / Chapter CHATPER 4 --- ISOLATION OF DIFFERENTIALLY EXPRESSED mRNA IN DIFFERENT REGIONS OF THE RETINA / Introduction --- p.40-43 / Materials and Methods --- p.44-48 / Results --- p.48-50 / Discussion --- p.51-54 / Chapter CHATPER 5 --- GENERAL DISCUSSION --- p.56-58 / REFERENCE --- p.59-70 / FIGURES / TABLES
7

Differential responses of mouse nasal and temporal retinal neurites to chondroitin sulphates: the role of protein kinase C.

January 2005 (has links)
Lam Shi Ying Joyce. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2005. / Includes bibliographical references (leaves 107-114). / Abstract in English and Chinese. / Chapter CHAPTER 1 --- GENERAL INTRODUCTION --- p.1-19 / Chapter CHAPTER 2 --- EXPRESSION OF PROTEIN KINASE C (PKC) ISOFORMS IN THE VENTRAL TEMPORAL (VT) AND DORSAL NASAL (DN) RETINAL GROWTH CONES OF MOUSE EMBRYOS / INTRODUCTION --- p.20-22 / MATERIALS AND METHODS --- p.22-24 / RESULTS --- p.24-31 / DISCUSSION --- p.31-37 / FIGURES --- p.38-46 / Chapter CHAPTER 3 --- EFFECTS ON MOUSE NASAL AND TEMPORAL RETINAL NEURITES TO CHONDROITIN SULPHATES (CS) AFTER ALTERATION OF PKC ACTIVITY / INTRODUCTION --- p.47-48 / MATERIALS AND METHODS --- p.49-51 / RESULTS --- p.51-59 / DISCUSSION --- p.60-67 / FIGURES --- p.68-74 / Chapter CHAPTER 4 --- EFFECTS ON AXON ROUTING AFTER ALTERATION OF PKC ACTIVITY ON GUIDANCE OF RETINAL GANGLION CELL AXONS AT THE OPTIC CHIASM OF MOUSE EMBRYOS / INTRODUCTION --- p.75-76 / MATERIALS AND METHODS --- p.77-80 / RESULTS --- p.80-89 / DISCUSSION --- p.89-95 / FIGURES --- p.96-103 / Chapter CHAPTER 5 --- GENERAL CONCLUSION --- p.104-106 / REFERENCES --- p.107-114
8

Investigations of factors that control retinal axon growth during mouse optic pathway development. / CUHK electronic theses & dissertations collection

January 2010 (has links)
Chiasm cells, which include glia and neurons, are generated early before any retinal axon arrives at the midline of the mouse ventral diencephalon. These cells have been shown to affect retinal axon growth and patterning in the optic chiasm. In this study, we used EdU (5-ethyny1-2'-deoxyuridine) for birthdating these chiasm cells, aiming to find out when these cells are generated; then we tried to trace their fates at later stages of development. EdU injection at embryonic day (E) 9.5 to El 1 labeled a number of chiasmatic neurons and radial glial cells at E13, which were immunoreactive for SSEA-1 and RC2, respectively. After colocalization studies, we found that most of these neurons were born as early as E9.5, while a large number of radial glial cells were born as from El 1. Both E9.5-born chiasmatic neurons and Ell-born radial glia decreased by E14-E16; the radial glia even disappeared finally from the midline. Furthermore, we found that some chiasmatic neurons underwent apoptotic cell death as from El 4, and that the radial glia likely differentiated into other cell types after finishing their retinal axon guidance mission at the midline. So it is reasonable that some of the earliest born chiasm cells disappear during development. / During development, retinal ganglion cell axons grow from the eye to the ventral diencephalon, where axons from the two eyes converge and segregate into crossed and uncrossed projections, forming the optic chiasm. This pattern is critical for binocular vision. Although significant progress has been obtained over the past decades, how retinal axon growth and guidance are regulated at the chiasm is largely unknown. Our research will focus on those problems. / In the last part of this thesis, we investigated the retinal axon pathway in the ventral diencephalon of the Sox10Dom mutant embryos and gamma-crystallin mutant embryos. Our findings indicate that Sox10 may not contribute to axon guidance in the developing optic pathway whereas gammaA-crystallin may only play a role in the later uncrossed axons. / N-methyl-D-aspartate (NMDA) receptor is one of the ionotropic glutamate receptors, which are important in synaptic plasticity, apart from implications in dendritic spine remodeling, neurite outgrowth, elongation and branching and glutamate neurotoxicity. There are several subtypes of NMDA receptor channel subunits, NR1, NR2A-D, NR3A&B. The functional diversity of NMDA receptor resides in the different assembly of subunits. In this study, we used RT-PCR to analyze the mRNA expression of all the NMDA receptor subunits in mouse embryos. After that we chose the NR1, NR2B and NR3A antibodies to investigate NMDA receptor subunit expression in the optic pathway during mouse optic pathway development. Using immunohistochemistry, we found that NR1, NR2B and NR3A were expressed in the mouse retina and optic pathway as from E13 when the optic chiasm is forming. Expression of the NMDA receptor subunits were found in the inner cell layers and along retinal axons. Colocalization studies showed that NR1, NR2B and NR3A were localized on the ganglion cells and their axons. In the ventral diencephalon, these subunits were expressed extensively, but NR1 and NR3A were particularly strong along the optic nerve and optic tract. Furthermore, to identify the function of NMDA receptor during optic chiasm development, we cultured E14 retinal explants on laminin and poly-D-ornithine in the presence of the NMDA receptor antagonists MK-801 or Dextrorphan-D-tartrate. These two antagonists can significantly inhibit the retinal axon outgrowth, suggesting that the NMDA receptor promotes retinal axon outgrowth in the retinofugal pathway during optic chiasm development. / Li, Jia. / Adviser: Chan Sun On. / Source: Dissertation Abstracts International, Volume: 73-02, Section: B, page: . / Thesis (Ph.D.)--Chinese University of Hong Kong, 2010. / Includes bibliographical references (leaves 145-158). / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Electronic reproduction. [Ann Arbor, MI] : ProQuest Information and Learning, [201-] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Abstract also in Chinese.
9

Molecules signaling axon growth during development of mouse optic pathway. / CUHK electronic theses & dissertations collection

January 2004 (has links)
Hao Yanli. / "July 2004." / Thesis (Ph.D.)--Chinese University of Hong Kong, 2004. / Includes bibliographical references (p. 113-134). / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Mode of access: World Wide Web. / Abstracts in English and Chinese.
10

"Your World Stops": The Relationship Chiasm between Teachers and Students in Court-Mandated Adult Education

Mottern, Rondal David 01 December 2011 (has links)
This study examines the experiences of teachers working with court-mandated students in GED/ABE programs. While there is a considerable body of literature on adult correctional education, this literature almost exclusively deals with teachers and students working within incarceration settings, where students are in jail or prison. There is a lack of research on the experiences of teachers working with students who are a part of the correctional system but are placed within the community, i.e., students who are in community corrections programs such as probation and parole. This study begins to fill that void in the research literature. This research is phenomenological, using existential hermeneutic phenomenology as both a guiding philosophy and as a methodology, and is concerned with teachers’ experiences working with GED/ABE students in community corrections. The phenomenological methodology follows that used by the University of Tennessee phenomenology group, led by Sandra Thomas and Howard Pollio. The findings of the study indicate a special relationship (chiasm) between teachers and students as the ground with four themes, representing changes within the students, as experienced by the teachers, and changes within the teachers, themselves. A discussion of the significance of these findings in adult education and educational psychology, including implications for professional development within adult education and educational psychology, is included.

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