Medicine & Health

Publication Search Results

Now showing 1 - 10 of 37
  • (1998) Bradley, Peter; Rozenfeld, Anatoly; Lee, Kevin; Jamieson, Dana; Heiser, Gernot; Satoh, S
    Journal Article
    The first results obtained using a SOI device for microdosimetry applications are presented. Microbeam and broadbeam spectroscopy methods are used for determining minority carrier lifetime and radiation damage constants. A spectroscopy model is presented which includes the majority of effects that impact spectral resolution. Charge collection statistics were found to substantially affect spectral resolution. Lateral diffusion effects significantly complicate charge collection

  • (1998) Lutze, J; Roden, J; Holly, C; Wolfe, Joseph; Egerton, J; Ball, Malcolm
    Journal Article
    Growth under elevated [CO2] promoted spring frost damage in field grown seedlings of snow gum (Eucalyptus pauciflora Sieb. ex Spreng.), one of the most frost tolerant of eucalypts. Freezing began in the leaf midvein, consistent with it being a major site of frost damage under field conditions. The average ice nucleation temperature was higher in leaves grown under elevated [CO2] (– 5.7 oC versus – 4.3 oC), consistent with the greater incidence of frost damage in these leaves (34% versus 68% of leaves damaged). These results have major implications for agriculture, forestry and vegetation dynamics, as an increase in frost susceptibility may reduce potential gains in productivity from CO2 fertilization and may affect predictions of vegetation change based on increasing temperature.

  • (1997) Das, T; Munroe, Paul; Bandyopadhyay, Srikanta; Bell, Toby; Swain, M
    Journal Article

  • (1996) Gleeson, M; Cripps, AW; Hensley, MJ; Wlodarczyk, JH; Clancy, RL; Henry, RL
    Journal Article

  • (1995) Zhao, Yong; Xiong, Z; Zhang, H; Chen, B
    Journal Article
    The effects of Sn doping on the superconductivity and the electronic properties of the YBaSrCu3−xSnxOy system have been investigated by electronic transport and electron paramagnetic resonance (EPR) measurements. The superconductivity of the system is gradually depressed by Sn doping. Meanwhile, the carrier concentration is decreased and the EPR absorption is restored by doping Sn4+ at the Cu(1) site. Our results strongly suggest the localisation of the Cu2+ states at Cu---O chains, which is responsible for the reduction of the carriers and the suppression of the superconductivity.

  • (1995) Zhao, Yong; Zhang, Yanling; Choi, Caroline; Chen, B; Sorrell, Charles
    Journal Article
    Sr-based 123 compounds R1-xCaxSr2Cu2.7Mo0.3Oy with R = Pr, Nd, and Y are successfully stabilised by partial substitution of Mo for Cu. A tetragonal-orthorhomic-tetragonal transition is observed for R = Y and Nd, which is induced by different oxygen content in the samples. Tc of the samples is sensitive to the oxygen content other than the structure. For Pr-contained samples the resistivity decreases systematically with increasing the Ca dopant and oxygen content. The results show that the hybridisation of the conduction electrons with the 4f band of Pr in Sr-based 123 compounds is weaker than that in Ba-based 123 compounds.

  • (1997) Nielssen, O.; Buhrich, N.; Finlay-Jones, R.
    Journal Article
    Objective: Intravenous sedation of involuntary psychiatric patients is practised in almost all hospitals in New South Wales. Despite its widespread use, little has been published about the medications used or their safety and efficacy. The present study reports the frequency and reasons for intravenous sedation, the medications used, and the incidence of adverse effects. Method: Eighteen of 21 acute psychiatric admission units in the State were reviewed. The medical records of a random sample of 495 patients admitted involuntarily during 1990 were examined and information from the progress notes, drug charts and physical observations was recorded and subjected to statistical analysis. Results: Of the 495 patients, 132 (27%) were intravenously sedated. Eighty-six per cent (86%) of patients received a combination of haloperidol or diazepam, usually 20 mg of each drug. The threat of violence was the most significant patient characteristic predicting the use of intravenous sedation. Patients with mania or intoxication were relatively more likely to be intravenously sedated than other diagnostic categories. Patients admitted via accident and emergency departments and those admitted to teaching and metropolitan general hospitals compared to rural and large psychiatric hospitals were significantly more likely to receive intravenous sedation. The most common complications of intravenous sedation were dystonia (37%), hypotension (8%) and confusion (5%). The incidence of phlebitis and other extrapyramidal side-effects was probably under-reported. Conclusion: About one in four involuntary psychiatric patients receive intravenous sedation in NSW. Intravenous sedation is more likely when patients are admitted through accident and emergency departments to teaching or metropolitan hospitals, and pose a threat of violence. Intravenous sedation was shown to be a safe procedure given certain precautions.

  • (1993) Finlay-Jones, R.; Nielssen, O.
    Journal Article

  • (1999) Gorrie, Catherine; Duflou, J; Brown, Jennifer; Waite, Phil
    Journal Article

  • (1998) Bertrand, P. P; Kunze, W. A.; Bornstein, J. C.; Furness, J. B.
    Journal Article
    The patterns of innervation of the mucosa by axons of individual primary afferent neurons with cell bodies in the myenteric plexus were studied by mapping sites from which electrical stimulation of the mucosa elicited action potentials (APs) in their cell bodies. Segments of guinea-pig ileum were dissected to reveal the myenteric plexus over half of the intestinal circumference, leaving the mucosa intact over the other half. Intracellular recordings were taken from myenteric neurons located within 1 mm of the intact mucosa. Focal electrical stimuli were applied to the mucosa at multiple locations separated by about 1 mm. Neurons that responded had round or oval cell bodies with several long processes (Dogiel type II) and APs that had an inflection on the falling phase (AH-neurons). Responses consisted of single APs or bursts of APs. Maps of the mucosal projections of 30 neurons were generated. The maximum distances from which individual neurons responded were 7 mm circumferential and 2 mm oral or anal to the cell body with a higher proportion of responses from the oral regions. The areas of intact mucosa calculated to be innervated ranged from 1 mm2 up to approximately 15 mm2 (mean 3.9 mm2; median 2.5 mm2). It is estimated that the areas innervated would be two to three times larger under conditions where part of the mucosa is not removed. Some neurons also responded to a chemical or a mechanical stimulus applied to the mucosa within the electrically mapped area. It is concluded that intrinsic primary afferent neurons have overlapping receptive fields with 230 to 350 neurons innervating the same region of mucosa.