. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. LUMINESCENCE IN HIPPOPODIUS 48.}. FIGURE 8. Experiment demonstrating the conduction across a "bridge" of exumbrellar epithelium. An incision (dashed line between asterisks) prevents conduction in the muscular regions. The experiment also illustrates the two components of involution. In the first trace, only the velar radial muscles responded. In the second trace, those of the pseudovelum re- sponded immediately afterwards. The dot indicates the stimulation artefact; the lower line shows the 200 /ur voltage calibrat
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. LUMINESCENCE IN HIPPOPODIUS 48.}. FIGURE 8. Experiment demonstrating the conduction across a "bridge" of exumbrellar epithelium. An incision (dashed line between asterisks) prevents conduction in the muscular regions. The experiment also illustrates the two components of involution. In the first trace, only the velar radial muscles responded. In the second trace, those of the pseudovelum re- sponded immediately afterwards. The dot indicates the stimulation artefact; the lower line shows the 200 /ur voltage calibration. Time scale is 10 msec. Blolmnincscence "Ice blue" in color, often surprisingly strong, bioluminescence accompanies involution and, like it, is stimulated by mecbanical or electrical shocks (Fig. 9). The basic response is a single flash, highly variable in duration (40-400 msec) and characterized by a fast ascending slope and a longer decay of the first order; double or multiple flashes also often occur and several flashes may lead to a rapid flickering post discharge (Fig. 13). Glow has never been observed. Repetitive stimulation at 5 or 1 Hz, just above threshold, evokes one to one responses. Series which comprise 10 to 40 flashes show first a period of facilitation, followed by a more or less fluctuating plateau (Fig. 9). This may cease abruptly or decay gradually. For bioluminescence to be re-evoked, stronger stimulation or a period of rest is necessary. One to one responses follow an acceleration of the stimulation frequency up to about 10 Hz. In addition to facilitation, partial summation is then apparent. Wlfl/l/l/1/1/1/1/ viniiMiiiin/yv 11 ! FIGURE 9. A series of shocks at lower frequency (dots) evokes a facilitating series of flashes. Scale is 1 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 or
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
