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Biomedical subjects

A M Gardner

Publications and source records attributed to A M Gardner.

At least 55 records · Page 3Linked to original sources
PubMed1980

Long-term follow-up of partial caval occlusion by clip.

A series of 55 patients with partial caval occlusion by a smooth clip is presented with a follow-up period of 5 to 12 years. The clip provided continuing protection from fatal emboli, Persistent new postoperative leg swelling was present in 18 percent of patients but was generally well controlled with elastic stockings. In two patients with previous thromboembolism a postphlebitic syndrome proved troublesome. The quality of life led by patients was high and was enhanced by their knowledge of permanent protection against lethal embolism.

Clothing↗
PubMed1979

Quantitative determination of tris-(2,3-dibromopropyl) phosphate by densitometry of thin layer chromatograms.

The flame retardant tris-(2,3-dibromopropyl) phosphate (Tris) was chromatographed on silica gel thin layer plates, using ethyl acetate-hexane (30+70) as the developing solvent. Tris was visualized by spraying the chromatogram with 1% aqueous silver nitrate followed by exposure to ultraviolet light for 40 min. Tris appeared as dark gray spots on a white background; the spots were quantitated by densitometry at 660 nm. The lower level of sensitivity was 50 ng; calibration plots were linear from 50 to 800 ng. The procedure was developed to determine the levels of unmetabolized Tris remaining after exposure to sewage sludge suspensions. Recovery of Tris from 3 sewage sludge samples fortified at the 1.0 ppm level averaged 97%.

Chromatography, Thin Layer↗
PubMed1976

Excretion of hydroxylated polychlorinated biphenyl metabolites in cows' milk.

Four lactating Holstein cows were each given a single oral dose of either 0.5 g 2,5,2',5'-tetrachlorobiphenyl, 0.5 g 2,5,2',4',5'-pentachlorobiphenyl, 1.5 g Aroclor 1242, or 1.5 g Aroclor 1254 in gelatin capsules. Milk samples were collected twice daily at the am and pm milkings and were analyzed for polychlorinated biphenyl (PCB) metabolites and PCBs. Excretion of metabolites in the milk paralleled excretion of the parent PCBs, with maximum amounts eliminated 1 day after dosing. Less than 0.06% of the initial doses of the 2 single components appeared as metabolites in milk over a period of 10 days. Most of the metabolites occurred as conjugates. Only the 4-hydroxy metabolites were found in the milk of cows given single components. Milk samples from cows given Aroclor 1242 or Aroclor 1254 contained 10 and 4 monohydroxy metabolites, respectively. Using the same methodology, no monohydroxy metabolites were detected in whole milk samples from herds accidentally contaminated with a polybrominated biphenyl mixture.

Animals↗