David R. McKenzie

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Despite the long history of using cell cultures in vitro for radiobiological studies, there is to date no study specifically addressing the dosimetric implications of flask selection and exposure environment in clonogenic assays. The consequent variability in dosimetry between laboratories impedes the comparison of results. In this study we compare the dose(More)
The surface of polyethylene was modified by plasma immersion ion implantation. Structure changes including carbonization and oxidation were observed. High surface energy of the modified polyethylene was attributed to the presence of free radicals on the surface. The surface energy decay with storage time after treatment was explained by a decay of the free(More)
To identify and sort out subpopulations of cells from more complex and heterogeneous assemblies of cells is important for many biomedical applications, and the development of cost- and labour-efficient techniques to accomplish this is warranted. In this report, we have developed a novel array-based platform to discriminate cellular populations based on(More)
Evidence of the effect of molecule size (molecular sieving) was discovered in leak channels similar to those found in hermetically sealed implantable bionics. A range of test gases of different molecular sizes was used to investigate the relative leak rates of several different samples. A contemporary model of molecular sieving is shown to be in partial(More)
We will synthesise technologically important transparent conducting oxides and MAX phase materials as thin films. A range of advanced deposition techniques, in particular a pulsed cathodic arc as well as a high powered pulsed magnetron sputtering system will be used to synthesise the materials of interest. These discharges are unique in allowing fine(More)
Plasma immersion ion implantation (PIII) is a surface modification technique where an object whose surface is to be modified is placed in a plasma and pulse biased. For the treatment of insulators, a conductive mesh is often used to minimise the effects of surface charging. In this paper, ion energy distributions (IEDs) during mesh assisted PIII are studied(More)
A detailed atomic-resolution scanning tunneling microscopy (STM) and density functional theory study of the adsorption, dissociation, and surface diffusion of phosphine (PH(3)) on Si(001) is presented. Adsorbate coverages from approximately 0.01 monolayer to saturation are investigated, and adsorption is performed at room temperature and 120 K. It is shown(More)
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