. Chemical embryology. Embryology. 634 THE RESPIRATION AND [PT. Ill Henze admitted that after a certain point, as was shown later for Dixippus morosus by v. Buddenbrock & v. Rohr, and for Fundulus heteroclitus by Amberson, Mayerson & Scott, the oxygen utiHsation ceased to follow oxygen partial pressure. Subsequent work with other eggs has tended to confirm Henze rather than Warburg; thus Dakin & Dakin and Burfield have shown for the plaice's egg and Parnas & Krasinska for the frog's egg that the respiratory rate depends directly on the partial pressure of oxygen, below a certai
. Chemical embryology. Embryology. 634 THE RESPIRATION AND [PT. Ill Henze admitted that after a certain point, as was shown later for Dixippus morosus by v. Buddenbrock & v. Rohr, and for Fundulus heteroclitus by Amberson, Mayerson & Scott, the oxygen utiHsation ceased to follow oxygen partial pressure. Subsequent work with other eggs has tended to confirm Henze rather than Warburg; thus Dakin & Dakin and Burfield have shown for the plaice's egg and Parnas & Krasinska for the frog's egg that the respiratory rate depends directly on the partial pressure of oxygen, below a certain point. Recently Drastich, working with the eggs of Strongylocentrotus lividus, has shown that there is a linear relation between cubic millimetres oxygen used. 9' ⢠O ⢠~ 7 S '^ 'e r^ -Vs 5g Q. ^,0 7 _-â-â ~'^''°'' E 15 4o ^ ^ f J~'^^'^ 33 Q- 1 ("i ~ 3-n â ^ t 5 L F 0-- k p 0^ 3 ^ ° Â¥ ....... 3 3 S n T 1 1 .â1 1 1 1 1 1 1 -I Partial pressure of Oxygen Fig. io6. 50 TOO pressure of oxygen Fig. 107. per gram per hour and log. partial pressure. This would imply a state of affairs in which the curve of oxygen consumption fell off rapidly at low partial pressures (see Figs. 106 and 107). And Amber- son finds no change in oxygen consumption of Arbacia eggs between 228 and 20 mm. partial pressure of oxygen, though below that it falls off quickly. Everything seems to depend upon the level of oxygen concentration at which this point comes; thus Loeb, in his work on Ctenolabrus eggs, could find no difference in rate of develop- ment or morphology between eggs in air or in 100 per cent, oxygen, and Krogh & Johansen successfully hatched plaice eggs in oxygen pressures of one-quarter the normal (230 mm. abs.). Below this point abnormalities occurred. Warburg returned to the subject of normal respiration in 1915,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance
Size: 1615px × 1548px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookpublishernewyorkthem, booksubjectembryology
