. Bioenergetics. Bioenergetics. 82 UV lamp, three test tubes with a frozen rhodamin solution, one containing at the side of the dye M NaCl, another Af KG. and the third no salt at all. The latter two will show hardly any phosphorescence, while the tube with NaCl shows an intense red c o I/) I/) E. Nl Fig. 22. Light emission of a frozen aqueous rhodamin B solution (10^^ M) in the presence of various concentrations of NaCl, KCl, Rb, and CsCl. The abscissa corresponds to the weak light emission of the control tube with no salt, so the curve's going below it means quenching. glow at
. Bioenergetics. Bioenergetics. 82 UV lamp, three test tubes with a frozen rhodamin solution, one containing at the side of the dye M NaCl, another Af KG. and the third no salt at all. The latter two will show hardly any phosphorescence, while the tube with NaCl shows an intense red c o I/) I/) E. Nl Fig. 22. Light emission of a frozen aqueous rhodamin B solution (10^^ M) in the presence of various concentrations of NaCl, KCl, Rb, and CsCl. The abscissa corresponds to the weak light emission of the control tube with no salt, so the curve's going below it means quenching. glow at the temperature of our freezing mixture. It is very impres- sive, indeed, to see the difference of the two so closely related ions demonstrated in such a striking fashion. The hydrate shell of Li^ is still bigger than that of Na+ and so the disorder and harm caused by this ion have to be still graver. For the biologist the action of Li" is not less interesting than that of Na", having been discovered by Herbst that it induces mon- strosities in developing embryos exposed at an early stage for a short while to relatively low concentrations of Li+. In rhodamin the graver disorder declares itself in a quenching of light emis- sion. Since the light emission of (salt-free) rhodamin is rather weak this action is not very impressive. For the demonstration of. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Szent-Györgyi, Albert, 1893-1986. New York, Academic Press
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