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Biomedical subjects

B Gylseth

Publications and source records attributed to B Gylseth.

5 recordsLinked to original sources
PubMed1979

Determination of inorganic fiber density in human lung tissue by scanning electron microscopy after low temperature ashing.

The concentration of asbestos fibers in lung tissue may give information about previous occupational asbestos exposure. A procedure for the preparation, quantification and identification of asbestos fibers in human tissue is presented in this report. The procedure is based on low-temperature plasma ashing of dry tissue, examination of the ash by scanning electron microscopy, and energy dispersive X-ray microanalysis. The advantages and disadvantages of this method are also discussed briefly.

Asbestos↗
PubMed1979

An exchange of membrane filter samples of airborne asbestos between one United Kingdom and three Scandinavian laboratories.

An asbestos fiber counting trial based on the postal exchange of mounted and unmounted membrane filter samples was conducted between laboratories in Denmark, Norway, Sweden and the United Kingdom. The exchange was organized on the same basis as a previous international exchange involving nine countries (5); the United Kingdom laboratory had also participated in the previous exchange. Differences in counting techniques were distinguished from those due to the method used to make the filter transparent. Counting techniques gave rise to the biggest differences, giving a ratio of highest to lowest count of 2.75 for amphibole and 3.2 for chrysotile asbestos slides. A comparison was also made with the results of the previous international trial; it was made possible by the recounting of some of the slides from this exchange. Serious deterioration over two years was found in all slides except those mounted with the acetone/triacetin method.

Air Pollutants↗
PubMed1978

Whole blood chromium level and chromium excretion in the rat after zinc chromate inhalation.

Studies on absorption and excretion of chromium in the rat exposed to known atmospheric concentrations of zinc chromate in an inhalation chamber and the influence of diurnal variations in physical activity have been carried out. Chromium analyses were performed on samples of blood, urine and faeces using a method for determining chromium in small samples of biological material based on flameless atomic absorption spectrometry. Zinc chromate is absorbed quickly during exposure and excreted mainly via urine. An accumulation of chromium in blood was observed, followed by a slow elimination. It is suggested that chromium from zinc chromate enters the blood in the hexavalent state.

Animals↗
PubMed1977

Evaluation of chromium exposure based on a simplified method for urinary chromium determination.

The urine chromium levels for unexposed and chromium exposed persons were determined by a simplified method which is well suited for routine, large-scale use. A group of welders working on chromium alloyed steel were investigated. For these welders a high degree of correlation was found between the concentration of inhaled chromium and the chromium concentration in the urine immediately after work. At an exposure level of 0.05 mg/m3, measured as chromium, a urinary chromium concentration of approximately 40 microng/l was measured after work. This urinary chromium level is suggested as a guideline indicating the need for a thorough investigation of chromium exposure.

Air Pollutants↗