Bradley J Stewart

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BACKGROUND The purpose of this study was to determine the extent to which pepsin and trypsin concentrations in feeding tube aspirates, in addition to pH, contribute to predicting feeding tube position. METHODS Aspirates from 742 feeding tubes (nasogastric, n = 343; nasointestinal, n = 399) were tested for pH and enzyme concentrations. Also tested were(More)
This study tested the hypothesis that central administration of corticotrophin-releasing hormone (CRH) and/or arginine vasopressin (AVP) will affect the secretion of LH in rams and that testosterone is necessary for these actions to occur. Plasma LH levels were measured in castrated rams during 1 h infusion of either 100 microliter vehicle/mock(More)
BACKGROUND The addition of laboratory bilirubin readings to an algorithm based on pH alone improves prediction of feeding tube location; although reliable pH-teststrips are available, there is no bedside test to measure bilirubin in feeding tube aspirates. OBJECTIVES This study was designed to test the efficacy of a bilirubin teststrip with a newly(More)
An ethynylestradiol (EE2) radioimmunoassay method (RIA) using a monoclonal antibody (MAB) reagent is described. 76 plasma and 67 buffer blanks spiked with known concentrations of EE2 were used as positive samples. The steroid was extracted using dichloromethane method with an extraction efficiency of 78 +/- 2.6%. The plasma extracts were not purified.(More)
This study examined all cases of Staphylococcus aureus bacteraemia (SAB) in the haemodialysis cohort at the Royal Darwin Hospital, Australia over a seven-year period. Midway through this period, antisepsis for arteriovenous fistulae (AVF) and central venous catheters (CVC) changed from 0.5% chlorhexidine solution to 2% chlorhexidine solution. Rates of SAB(More)
Progesterone concentrations during pregnancy were measured in the plasma of the viviparous lizard (scincid) Tiliqua (Trachydosaurus) rugosa, using a radioimmunoassay specific for progesterone. The length of gestation in this Australian lizard was 140-170 days. The average number of young was 2.8 and the mean neonatal weight 58 g (maternal body weight(More)
The distribution of blood flow to the lungs was measured with labelled microspheres injected into horses before and during anaesthesia. Anaesthesia was induced with glycerol guaiacolate ether and ketamine, and maintained with the spontaneous breathing of halothane in oxygen. In a preliminary group of six horses, flow distribution was observed during(More)
Production of monoclonal antibodies (MABs) to a 17 alpha-ethynyl-1,3,5 (10)-estratriene-3,17 beta-diol (ethynylestradiol, EE2) hapten is described. Culture antibodies generated by hybridized cells tested in enzyme-linked immunosorbent assay (ELISA) bound the 6-oxoethynyl-estradiol-6-(0-carboxymethyl) oxime-bovine serum albumin conjugate (EE2-6-0 CMO-BSA)(More)
A direct radioimmunoassay was developed for assessing the levonorgestrel levels in human plasma without the need for heat, chromatographic or extraction pretreatment. D-norgestrel-3 (0-carboxymethyl)-oximino-BSA conjugate was used to raise antibodies having a low binding affinity towards other endogenous steroids. The rivanol-purified antiserum after(More)