TERCEIRÂ REUNIÄO BRASILEIRA CIENCIA DO SOLO

ANAIS DA TERCEIRA RETJNIÂO BRASILEIRA DE CIÊNCIA DO SOLO _ 501
phorsäureester als Intermediärprodukte der gesamten Stoffsynthese
diskutiert. ,
SUMMARY
As has been poited out in former communications, one observed,
in artificial cells, a metabolic mechanism, according to which of all
ions only the potassioum ions accumulate in tehe cells in major quantities,
and therefore only these have a significant acid-neutraiizing
action in living cells. The work presented in this paper was done
in order to ascertain whether the same metabolic mechanism actually
occurs in living cells.
The studies were based upon the observation that, when the
hidrogen ion concentration of the cell sap is modified, there occurs
a simultaneous and corresponding modification of the potassium content,
in the living cells. To this purpose were the living cells induced
to modify hidrogen ion concentration of their sap through the
formation and degradation of strangly dissociated enery-rich esteres
of phosphoric acid, altering:
a) the respiratory intensity
b) the intensity of photosynthesis.
It was found in all the experiments that, with an increase of
the hidrogen ion concentration (formation of energy-rich prosphoric
acid esters) there occurs absorption of potassium ions by the living
cells, whereas the same ions are eliminatd by the celis with decreasing
hidrogen ion concentration (degradation of energy-rich
In this process, sodium ions ions are absorbed and eliminated only
in very small quantities. It is therefore probable for the metabolic
mechanism observed in artificial cells, to occur in living cells as well.
Consequently, onlk the potassium ions are capable of exerting a
considerable acid-neutralizing action in the living cells.
The resulting paralelism, between potassium consent and concentration
of nergy-rich phosphoric acid esters, was discussed, having
in view especially the sisrni f i^sr^e of these esters as intermediary
productes of all material synthesis.
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