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At least 73 records · Page 4Linked to original sources
PubMed1981

[Lethal and neutral temperature of a helium-oxygen atmosphere for rabbits in the presence of elevated atmospheric pressure].

The 5 to 20-day stay of the rabbits in helio-oxygen medium at the pressure of 3534 kPa revealed a linear interrelationship between the temperature 297-302 K and oxygen consumption. At the low lethal temperature of 294 K rabbits perished within 24 hrs due to growing hypothermia. At the neutral temperature 302 K the respiratory heat loss constitutes 30-38% of the basal metabolism, heat loss from the skin surface decreases. The hyperbaric medium seems to have no thermoneutral zone adequate to air by its physiological effect.

Animals↗
PubMed2004

Combination of sorption tube sampling and thermal desorption with hollow waveguide FT-IR spectroscopy for atmospheric trace gas analysis: determination of atmospheric ethene at the lower ppb level.

The determination of organic trace gases in the ambient environment at the lower ppb level is demonstrated based on a novel technique combining sorption tube sampling on Molsieve and Carbosieve S-III, thermal desorption, and detection of the trace analyte by hollow waveguide Fourier transform infrared (HWG-FT-IR) spectroscopy. While ethene concentrations of approximately 5 ppm can be directly observed using HWG-FT-IR, enrichment factors of up to 5000 were achieved by sorption tube sampling and thermal desorption. Detection limits of approximately 1 ppb are reported. Efficient enrichment by the sampling tube is achieved due to the favorable internal volume ( approximately 0.4 cm(3) at a length of 470 mm) of the hollow waveguide serving as a miniaturized gas cell. This new method was validated for ethene by thermodesorption-cryofocusing-GC-FID as the reference method. Analytical performance has been compared for standard gas mixtures and for ethene measurements in urban air. Finally, ethene data from a sampling campaign at two alpine sites in Tyrol/Austria are presented.

Journal Article↗