. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 538 AGNES A. SMITH AND C. S. HAMMEN complete body paralysis, and finally cytolysis, or cellular disintegration in which the outer cellular layer peels away from the head region first and then proceeds posteriorly along the body. In concentrations higher than 10~8 M, the worms did not survive much more than three days (77 hours), while in lower concentrations survival was long enough to observe complete regeneration. When the experiment was stopped at 121 hours, the pond water controls as well as the experimentals in concentr
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 538 AGNES A. SMITH AND C. S. HAMMEN complete body paralysis, and finally cytolysis, or cellular disintegration in which the outer cellular layer peels away from the head region first and then proceeds posteriorly along the body. In concentrations higher than 10~8 M, the worms did not survive much more than three days (77 hours), while in lower concentrations survival was long enough to observe complete regeneration. When the experiment was stopped at 121 hours, the pond water controls as well as the experimentals in concentrations lower than 10~s M were still alive. The rate of new head regeneration of the experimental pieces in PCMB was found to be essentially the same as in the pond water control group. The most interesting observation was an increased incidence of some form of eye abnormal- ity in all experimental groups, relative to the small number of such defects in the controls. These were in the form of unequal eyes, eyes closer together than normal, eyes further apart than normal, one center eye, or joined eyes, the bridge of which often broke leaving two triangular eyes closer together than normal. Degree of abnormalities related to duration of exposure The index values of eye abnormalities resulting from different intervals of PCMB exposure during regeneration are shown by Figure 2. On observation at 168 hours, the experimental animals which had shorter intervals of PCMB exposure appeared identical to the normal controls, indicating correction of de- 1 X LU Q cr o 2 CD. — CONTROL --o--HEATED AVIDIN -A- AVIDIN 0 24 48 72 96 120 144 OBSERVATION TIME - HOURS FIGURE 4. Frequency of eye abnormalities resulting from a 24-hour exposure to 1 of heated avidin and 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 ori
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
