Potassium, for example, cannot be replaced by lithium, sodium or rubidium.
Atmospheric nitrogen, metallic potassium and elementary sulphur are just as useless.
Only the respective ions are necessary.
www.biologie.uni-hamburg.deSo kann z.B. Kalium weder durch Lithium, Natrium noch durch Rubidium ersetzt werden.
Ebenso unbrauchbar sind etwa atmosphärischer Stickstoff, metallisches Kalium oder elementarer Schwefel.
Erforderlich sind allein die jeweiligen Ionen.
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