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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.
51

An isotope washout technique to study skin perfusion pressure and vascular resistance in diabetes, hypertension and peripheral vascular disease / by Henry J. Duncan

Duncan, Henry J. (Henry John) January 1986 (has links)
Bibliography: leaves 140-190 / xiv, 190, [10] leaves : / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (M.D.)--University of Adelaide, 1987
52

Characterization of transport of positron emission tomography tracer 3'-deoxy-3'-fluorothymidine by nucleoside transporters

Paproski, Robert Joseph. January 2010 (has links)
Thesis (Ph.D.)--University of Alberta, 2009. / A thesis submitted to the Faculty of Graduate Studies and Research in partial fulfillment of the requirements for the degree of Doctor of Philosophy, Oncology. Title from pdf file main screen (viewed on January 30, 2010). Includes bibliographical references.
53

Internal residues of the narcotic organic chemicals in the Cladoceran, Daphnia magna

Pawlisz, Andrew V. January 1993 (has links)
The current work determined whether there is a constant tissue residue associated with narcotic compounds. In this investigation, the cladoceran, Daphnia magna was exposed to lethal levels (48h LC50) of ten, $ sp{14}$C-labelled, narcotic organic chemicals in a closed system. Exposure times, ambient concentrations, and body sizes were varied to evaluate their effects. The $ sp{14}$C-method developed in current work can detect chemicals in single D. magna in concentrations ranging from 0.02 to 6310 mmol/kg. Moreover, the technique detected phobic and lipophilic chemicals equally well. The technique's sensitivity (nmol/kg) allowed for detection of differences in the internal concentrations of pollutants among the unaffected, immobilized, and dead D. magna. Immobilized D. magna contained between 0.14 mmol/kg and 200 mmol/kg of narcotics. On the average, however, the internal residues were 3.1 mmol/kg (95%CL = 3.1 $ pm$ 2.0). This agreed with literature values. The effects of time of exposure, ambient concentration, and body size on the tissue residues of narcotics varied with the chemical compound.
54

Dynamics of stream and groundwater exchange using environmental tracers

Pritchard, Jodie Lee, January 2005 (has links)
Thesis (Ph.D.) -- Flinders University, School of Chemistry, Physics and Earth Sciences. / Typescript (bound). Includes bibliographical references (leaves 265-281). Also available online.
55

Application des traceurs isotopiques Pb-Pb, Sm-Nd et Lu-Hf à la compréhension de l'histoire archéenne du bouclier canadien et à la formation de la croûte continentale /

Isnard, Hélène, January 2003 (has links)
Thèse (D.R.Min.) -- Université du Québec à Chicoutimi, programme extensionné à l'Université du Québec à Montréal, 2003. / Bibliogr.: f. 203-204. Document électronique également accessible en format PDF. CaQCU
56

Development of a System for Real-Time Measurements of Metabolite Transport in Plants Using Short-Lived Positron-Emitting Radiotracers

Kiser, Matthew R., January 2008 (has links)
Thesis (Ph. D.)--Duke University, 2008.
57

Using radium and radon to evaluate ground water discharge and benthic exchange in upper Newport Bay, California

Worsnopp, Madeline Breeze. January 2007 (has links)
Thesis (M.S.)--University of Southern California, 2007. / Includes bibliographical references (leaves 92-96).
58

Internal residues of the narcotic organic chemicals in the Cladoceran, Daphnia magna

Pawlisz, Andrew V. January 1993 (has links)
No description available.
59

The use of anatomically based models for the analysis of imaged tracer experiments in humans

Fine, David Robert January 1994 (has links)
A thesis submitted to the faculty of Engineering, University of the Witwatersrand, Johannesburg , in fulfillment of the requirements for the degree of Doctor of Philosophy. Johannesburg, November 1994 / Organ function is often characterised using imaging techniques. In particular a tracer is often used which does not react with tissue, is low in concentration, follows body fluid flows and is distinguishable from the observed system and thus measurable. These requirements ensure linear characteristics of the tracer. In this thesis, these linear characteristics are used to develop a generalised mathematical theory to determine organ function from imaged tracer experiments. The theory is based on anatomical and physiological information for single and multiple input organs. [Abbreviated Abstract. Open document to view full version] / MT2018
60

A determination of air-sea gas exchange and upper ocean biological production from five noble gasses and tritiugenic helium-3

Stanley, Rachel H. R January 2007 (has links)
Thesis (Ph. D.)--Joint Program in Chemical Oceanography (Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 2007. / Includes bibliographical references (p. 215-225). / The five noble gases (helium, neon, argon, krypton, and xenon) are biologically and chemically inert, making them ideal oceanographic tracers. Additionally, the noble gases have a wide range of solubilities and molecular diffusivities, and thus respond differently to physical forcing. Tritium, an isotope of hydrogen, is useful in tandem with its daughter helium-3 as a tracer for water mass ages. In this thesis, a fourteen month time-series of the five noble gases, helium-3 and tritium was measured at the Bermuda Atlantic Time-series Study (BATS) site. The time-series of five noble gases was used to develop a parameterization of air-sea gas exchange for oligotrophic waters and wind speeds between 0 and 13 m s-1 that explicitly includes bubble processes and that constrains diffusive gas exchange to ± 6% and complete and partial air injection processes to ± 15%. Additionally, the parameterization is based on weeks to seasonal time scales, matching the time scales of many relevant biogeochemical cycles. The time-series of helium isotopes, tritium, argon, and oxygen was used to constrain upper ocean biological production. Specifically, the helium flux gauge technique was used to estimate new production, apparent oxygen utilization rates were used to quantify export production, and euphotic zone seasonal cycles of oxygen and argon were used to determine net community production. The concurrent use of these three methods allows examination of the relationship between the types of production and begins to address a number of apparent inconsistencies in the elemental budgets of carbon, oxygen, and nitrogen. / by Rachel H.R. Stanley. / Ph.D.

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