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Comparison of bone formation rates measured by radiocalcium kinetics and double-tetracycline labeling in maintenance dialysis patients.
Calcif Tissue Int
May 1994
Department of Medicine, Flinders Medical Centre, Bedford Park, South Australia.
We report 23 prospective studies on 18 maintenance dialysis patients in whom we measured skeletal mineralization rate (m) using 47Ca, analyzed by the expanding pool model, and compared it with the histologic bone formation rate (bfr), volume referent, estimated on tetracycline-labeled iliac crest bone. The patients showed a spectrum of bone disease types including adynamic bone, aluminum-related osteomalacia, and various degrees of secondary hyperparathyroidism. The mean width between double labels, on which mineral apposition rate depended, was estimated using a simple formula relating area to perimeter for each feature enclosed by the labels.
View Article and Find Full Text PDFEffect of vitamin E on acute iron load-potentiated aggregation, secretion, calcium uptake and thromboxane biosynthesis in rat platelets.
Atherosclerosis
October 1992
INSERM U. 63-22, Bron, France.
In the present study performed on rats, we investigated the influence of an in vivo acute iron load on several platelet parameters and their modification after vitamin E supplementation. Iron load was achieved by injecting iron dextran corresponding to 0.1 mg Fe3+ per kg in the gluteus muscles.
View Article and Find Full Text PDFA comparison of four in vitro marginal leakage tests applied to root surface restorations.
J Dent
October 1992
Department of Restorative Dentistry, University of Leeds School of Dentistry, UK.
Marginal leakage associated with a variety of restorative materials, placed in root surface cavities of extracted teeth, was assessed by immersing the teeth in either acidified gelatin, eosin dye, silver nitrate or a solution of radiocalcium. The allocation of a score, dependent on the depth of tracer penetration at the interface, allowed comparisons to be made between the leakage tests employed. The rank order of the four leakage tests was generally consistent.
View Article and Find Full Text PDFThe availability of currently used methods of measuring intestinal calcium absorption is limited by their expense and complexity. Since this measurement may be important in selecting appropriate therapies for patients with osteoporosis, a simpler procedure is required. This paper describes a test which measures the intestinal absorption of stable strontium.
View Article and Find Full Text PDFIt has been suggested that the oral administration of sorbitol promotes calcium absorption, while glucose has no effect. We have therefore compared the effect of oral sorbitol and glucose on the absorption of radiocalcium from low and high carrier loads in healthy postmenopausal women. In a control group of 20 women given neither sorbitol nor glucose, the mean +/- SEM fractional radiocalcium absorption rate from a low carrier load was 0.
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