. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 10v, 10Hz 15v,10Hz 20v,10Hz 30v,10Hz 70v, 10 Hz 120v,10 Hz FIGURE 3. Schematic representation of recruitment of luminescent zones in response to pulse trains, lasting 2 s, of increasing voltage and applied to the nerve cord in the 12th segment. Symbols as in Figure 2. Data based on observations of six specimens. segment. In contrast, a pulse of 10-20 V applied to more anterior segments was sufficient to elicit posterior spread in the same preparation. Section of the nerve cord The portion of the nerve cord associated with a
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 10v, 10Hz 15v,10Hz 20v,10Hz 30v,10Hz 70v, 10 Hz 120v,10 Hz FIGURE 3. Schematic representation of recruitment of luminescent zones in response to pulse trains, lasting 2 s, of increasing voltage and applied to the nerve cord in the 12th segment. Symbols as in Figure 2. Data based on observations of six specimens. segment. In contrast, a pulse of 10-20 V applied to more anterior segments was sufficient to elicit posterior spread in the same preparation. Section of the nerve cord The portion of the nerve cord associated with a single posterior segment was first isolated from the rest of the cord by double section. Electrical stimulation of this isolated portion elicited a light emission confined to both parapods of the associated segment in all specimens tested. Section of the nerve cord in the posterior region of the worm blocked the propagation of luminescence following electrical stimulation anteriorly (Fig. 4). Unilateral section of the widely separated left or right rami of the anterior nerve cord (see Martin and Anctil, 1984) had no effect on the propagation of bilateral luminescence, which still progressed posterior to the level of section. The conduction pathway for luminescence thus appeared to involve not only the two anterior nerve cords but also the numerous commissures interconnecting 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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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
