. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 240 JOANNE G. WALKER 100. 0 4 8 12 16 20 DURATION OF INTERRUPTION (hrs) FIGURE 2. Per cent survival at 120 hours post exposure of 7 . following administration of two eight-hour oxygen doses interrupted by an interval in air. hyperbaric oxygen while those exposed to oxygen immediately after separation from the stock bucket were markedly oxygen sensitive. This increased resistance to oxygen might represent true adaptation of the worms to conditions of higher ox\gen tension or be the result of a conditioning of the env
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 240 JOANNE G. WALKER 100. 0 4 8 12 16 20 DURATION OF INTERRUPTION (hrs) FIGURE 2. Per cent survival at 120 hours post exposure of 7 . following administration of two eight-hour oxygen doses interrupted by an interval in air. hyperbaric oxygen while those exposed to oxygen immediately after separation from the stock bucket were markedly oxygen sensitive. This increased resistance to oxygen might represent true adaptation of the worms to conditions of higher ox\gen tension or be the result of a conditioning of the environmental medium. To test these alternatives an exchange experiment was run. After 17 days of TABLK II Survival after IX-hour oxygen exposure of freshly-separated and of laboratory-adapted T. tubifex (16 worms per group) Worm group Post-exposure survival (per cent) 20 ± 1 hours 42 ± 1 hours 92 ± 3 hours 16 ± 12 hours Experiment 1 Freshly-separated Adapted Experiment 2 Freshly-separated Adapted 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 Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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