Aufnahme von 22Na in die Zellkerne der Speicheldrüsen von Chironomus thummi
2014
Lezzi, Markus | Kroeger, Heinrich
The in vivo and in vitro uptake of ²²Na from the hemolymph into cell nuclei of larval salivary glands was measured and compared. The uptake of ²²Na in vivo follows approximately a saturation curve. The respective in vitro curve has a much steeper slope during the first 8 min and this phase is followed by an interval during which the ²²Na content of the nuclei decreases (8 to 16 min). After the 16th min it increases again to reach a nuclear ²²Na content approximately twice as high as that of nuclei in vivo at 60 minutes. The uptake curves are discussed in relation to recent findings on the induction of puffs in polytene chromosomes by inorganic ions.
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