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| Van Ginneken, L.; Blust, R.. |
| A combined gamma scintillation/liquid scintillation technique for the sequential determination of two radioactive tracers is described. The method was developed using a combined gamma/ß-emitter (<sup>57</sup>Co) and a pure ß-emitter (<sup>45</sup>Ca). First, the <sup>57</sup>Co radioactivity was determined by counting the samples in a gamma scintillation analyzer in the energy region 80-165 keV. Next, the samples were counted in a liquid scintillation analyzer. Only one energy region was used to count both isotopes to maximize the counting efficiencies. From the difference between quenched and unquenched ß-spectra, the counting region was set from 0 to 256 keV. The counting efficiency was related to a quench-indicating... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1995 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=2650 |
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| Blust, R.; Van Ginneken, L.; Decleir, W.. |
| The effect of temperature on the uptake of copper by the brine shrimp <i>Artemia franciscana</i> has been studied in chemically defined saltwater solutions. Animals were acclimated to temperatures ranging from 10°C to 35°C and exposed to copper at different temperatures within this range. The results show that within each temperature acclimation group, copper uptake increases with increasing temperature of exposure. Within each temperature acclimation group most of the variation can be related to the combined effect of temperature on the chemical speciation and diffusion rate of copper in the diffusion layer lining the exchange surfaces. The magnitude of the apparent activation energy for copper uptake indicates that it is a facilitated... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Artemia franciscana. |
| Ano: 1994 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=2535 |
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