. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 338 HOPE RITTER, JR. reversibility achieved with nitrogen after air exposure in the earlier experiment (Curve C, Fig. 2). Even forty minutes' contact with nitrogen (Curve D, Fig. 3) did not bring about a curve height increase beyond that recorded in Curve C, Figure 3. The height of Curve D, Figure 3, was depressed even further. In addition, again contrary to results obtained when the air-treated sample was bubbled with nitrogen, a comparison of half-wave potentials in Figure 3 illustrates nitrogen passage was accompanied by

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. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 338 HOPE RITTER, JR. reversibility achieved with nitrogen after air exposure in the earlier experiment (Curve C, Fig. 2). Even forty minutes' contact with nitrogen (Curve D, Fig. 3) did not bring about a curve height increase beyond that recorded in Curve C, Figure 3. The height of Curve D, Figure 3, was depressed even further. In addition, again contrary to results obtained when the air-treated sample was bubbled with nitrogen, a comparison of half-wave potentials in Figure 3 illustrates nitrogen passage was accompanied by  Stock Photo
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. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 338 HOPE RITTER, JR. reversibility achieved with nitrogen after air exposure in the earlier experiment (Curve C, Fig. 2). Even forty minutes' contact with nitrogen (Curve D, Fig. 3) did not bring about a curve height increase beyond that recorded in Curve C, Figure 3. The height of Curve D, Figure 3, was depressed even further. In addition, again contrary to results obtained when the air-treated sample was bubbled with nitrogen, a comparison of half-wave potentials in Figure 3 illustrates nitrogen passage was accompanied by
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. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 338 HOPE RITTER, JR. reversibility achieved with nitrogen after air exposure in the earlier experiment (Curve C, Fig. 2). Even forty minutes' contact with nitrogen (Curve D, Fig. 3) did not bring about a curve height increase beyond that recorded in Curve C, Figure 3. The height of Curve D, Figure 3, was depressed even further. In addition, again contrary to results obtained when the air-treated sample was bubbled with nitrogen, a comparison of half-wave potentials in Figure 3 illustrates nitrogen passage was accompanied by a reduction potential shift to a more positive reading. The phenomena just described are based on repeated observations. Polaro- grams illustrated trace events related to two treated gut samples; one sample using air passage followed by nitrogen gas (results verified by fourteen experiments), and one sample using "prepurified" oxygen followed by nitrogen gas (results verified by seven experiments). Although it has not been determined how much oxygen a small sample of gut fluid can absorb or bind without losing its potential with respect to GSH reduction during nitrogen passage, experiments suggest oxygen can overwhelm the glutathione recovery system. A. Evidence suggesting enzymatic reduction of GSH That partial GSH reduction can occur during nitrogen passage through a gut sample under prolonged exposure to air suggests strongly the presence of an appro-. -4 -04 FIGURE 4. Polarograms of the same hind-gut sample from Cryptocercus: (A) heated ten minutes, and (B) following pure oxygen passage five minutes (sensitivity X 2).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952;

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