PHYSIOLOGICAL OBSERVATIONS UPON A LARVAL EUSTRONGYLIDES. XI. INFLUENCE OF OXYGEN TENSION ON THE AEROBIC AND POST-ANAEROBIC OXYGEN CONSUMPTION

Abstract

Both the aerobic and post-anaerobic O2 consumption of larval E. ignotus is more dependent on the O2 tension at high than at low temps.; the latter more so than the former if experiments performed at equal temps. are compared. This difference is hardly noticeable, however, if experiments are compared in which the rates of O2 consumption are equal, i.e., if the post-anaerobic O2 consumption is studied at lower temps. than the aerobic one. The data support, on the whole, von Buddenbrock''s view of the essential similarity of both types of O2 consumption, but do not definitely disprove Harnisch''s concept of primary and secondary aerobiosis. The dependency on the tension is, in the present case, a true one and is not only simulated by O2 going into physical solution in the body fluids at higher tensions. The worm larvae are not killed by pure O2 within 6 hours.