. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CHEMORECEPTION IN CANCER 429 Study of the receptors of any dactyl began with selection of a subdivided bundle containing only a few chemoreceptive units, all giving substantial responses to single drops of M glycine and with endings suitably placed for stimulation in a restricted area on the dactyl tip proximal to the heavily chitinized cap. Re- sponse magnitude was ordinarily determined from the first second of the inte- grated response and expressed as an activity ratio (AR), the ratio of the experimental response
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CHEMORECEPTION IN CANCER 429 Study of the receptors of any dactyl began with selection of a subdivided bundle containing only a few chemoreceptive units, all giving substantial responses to single drops of M glycine and with endings suitably placed for stimulation in a restricted area on the dactyl tip proximal to the heavily chitinized cap. Re- sponse magnitude was ordinarily determined from the first second of the inte- grated response and expressed as an activity ratio (AR), the ratio of the experimental response to the reaction of that same preparation to M glycine. Since the standard glycine response was determined every few tests, expressing stimulatory effectiveness in this way served to compensate for temporal variation in sensitivity on the part of the same preparation, for variation in sensitivity and number of active units among preparations, and for the contribution of non- chemoreceptive units to the response. RESULTS AND SPECIFIC COMMENTS 1. Discrimination between incchano- and clicmoreceptors. Mechanoreceptor activity commonly occurs along with chemoreceptor responses within subdivided nerve bundles, as in Figure 1A, although not necessarily (Fig. 5). Continued subdivision of bundles carrying mixed activity frequently results in isolation of fascicles in which chemoreceptor units are dominant, the situation in Figure IB. Note, however, that this investigation offers no conclusive evidence concerning the possibility that chemoreceptor units may also be excited by physiologically reason-. 3 DROPS SEA WATER I DROP .05 M GLYCINE ARTIFACTS DURING SUBDIVISION 3 DROPS S W. I DROP GLY. 5 SEC. 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
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
