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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

Characterisation of a bagpipe homologue in Xenopus laevis

Civill, Nicola Dawn January 2000 (has links)
Mutations of Drosophila bagpipe, an NK3 class homeobox gene, result in failure of visceral mesoderm to differentiate into stomach tissue. Thus bagpipe, in association with other factors, is a good candidate for specification of visceral mesoderm in Drosophila. The cloning and characterisation of a Xenopus bagpipe homologue was therefore of great interest. This study describes the isolation of a full length Xenopus cDNA clone that on the basis of database analysis and sequence comparisons has been assigned as Xenopus bagpipe (XBap). Previous studies had revealed that the majority of homeoproteins recognise DNA sites with a 5'-TAAT-3' core but the NK class of homeoproteins had been shown to bind specifically to sites containing a 5'-CAAG-3' core. Experiments described here, however, show the XBap DNA binding site to be an even more divergent, 5'-TTAAGTGG-- TTAAGTGG-3'. A series of mutant oligonucleotides revealed that the `T' of the 5'- T_{1}A_{2}A_{3}G_{4}-3' core, as well as the presence of two such cores, are indeed essential for optimal XBap DNA binding. The murine NK3 class homeoproteins, Nkx-3.1 and Bapxl, are demonstrated to have the same requirements for optimal DNA binding as XBap. Drosophila Bagpipe, however, was found to have a less stringent requirement for a `T' at position one of the core, binding equally well to a 'C' in this position, but the presence of two such cores is still necessary for optimal DNA binding. Preliminary studies using site directed mutagenesis attempted to define the amino acids responsible for the differences. The effect of XBap on transcription was studied using a Xenopus oocyte assay and two cell transfection assays. XBap was not found to act as a transcriptional activator in any of these assays but evidence was obtained to suggest that a C-terminal truncation of XBap could act as a repressor of transcription.
2

Organ specific growth factors in the frog tadpole.

Lin, Shu-Chang. January 1942 (has links)
No description available.
3

SOME EFFECTS OF TRANSPLANTED ANTERIOR PITUITARIES ON HYPOPHYSECTOMIZED XENOPUS LAEVIS LARVAE

Briggs, Norma Jean, 1935- January 1977 (has links)
No description available.
4

Habitat selection behavior in three species of anuran larvae : environmental cues, ontogeny, and adaptive significance /

O'Hara, Richard K. January 1981 (has links)
Thesis (Ph. D.)--Oregon State University, 1981. / Typescript (photocopy). Includes bibliographical references (leaves 122-133). Also available on the World Wide Web.
5

Effects of an insecticide on amphibian communities /

Boone, Michelle D. January 2000 (has links)
Thesis (Ph. D.)--University of Missouri-Columbia, 2000. / Typescript. Vita. Includes bibliographical references. Also available on the Internet.
6

The role of thyroxine in spadefoot toad development

Storz, Brian L. Travis, Joseph, January 2003 (has links)
Thesis (M.S.)--Florida State University, 2003. / Advisor: Dr. Joseph Travis, Florida State University, College of Arts and Sciences, Dept. of Biological Science. Title and description from dissertation home page (viewed Apr. 12, 2004). Includes bibliographical references.
7

Effects of an insecticide on amphibian communities

Boone, Michelle D. January 2000 (has links)
Thesis (Ph. D.)--University of Missouri-Columbia, 2000. / Typescript. Vita. Includes bibliographical references. Also available on the Internet.
8

A multi-scale investigation of ecologically relevant effects of agricultural runoff on amphibians

Williams, Bethany K., Semlitsch, Raymond D. January 2008 (has links)
Title from PDF of title page (University of Missouri--Columbia, viewed on Feb 25, 2010). The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file. Dissertation advisor: Dr. Raymond D. Semlitsch. Vita. Includes bibliographical references.
9

Observations on melanophore control in the larvae of the South African clawed toad, Xenopus laevis (Daudin)

Shaskan, Edward G. January 1965 (has links)
No description available.
10

Social foraging in Bufo Americanus tadpoles

Sontag, Charles Robert. January 2007 (has links)
Thesis (Ph. D.)--State University of New York at Binghamton, Department of Biological Sciences, 2007. / Includes bibliographical references.

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