A QUANTITATIVE STUDY OF THE INTERRELATIONSHIP OF OXYGEN AND HYDROGEN ION CONCENTRATION IN INFLUENCING TUBULARIA REGENERATION

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Abstract
The regeneration of Tubularia stem segments was studied in sea water at varying concentrations of hydrogen ion (carbon dioxide tension) and oxygen. As the hydrogen ion concentration was increased there was a fall in the rate of regeneration. On the other hand, as the dissolved oxygen was increased, the rate of regeneration was increased. The effects of hydrogen ion and oxygen are interrelated, the resultant rate of regeneration being determined by the relative concentrations of both these factors in the sea water. Complete inhibition may be effected by increased hydrogen ion, decreased oxygen, or by a combination of both of these factors. As the hydrogen ion concentration was increased, complete inhibition occurred at higher oxygen concentrations. The origin of polarity in Tubularia regeneration was discussed in terms of these results.