Abstract
SYNOPSIS. Experiments were undertaken to examine and to quantitate the effect of CO2 upon movement, contractile vacuole activity, cellular volume and shape, and survival of Paramecium multimicronucleatum. Paramecia tolerated pressures of CO* up to 1 atmosphere for at least 24 hours. Above 1 atmosphere survival was inversely related to pressure of CO2. Increasing CO2 tensions slowed forward movement and altered length and width of the spiral paths. Pulsation rates of anterior contractile vacuoles diminished as the CO2 pressure increased. At 20 psi of CO2 vacuoles ceased to function. Paramecia retained their volume and shape when exposed to high CO2 tensions. Removal of CO2 from the medium decreased speed and length of spirals and caused an increase in cellular volume. These effects of pressure variation of “CO” are examined in terms of the ability of COS to expand the volume of hydrocarbons upon dissolving into these compounds and in terms of bicarbonate competing for cations at the cell membrane.
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