. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 430 E. A. WIDDER AND J. F. CASE Mechanical Acid O). 05 Q CO LU FIGURE 4. Mechanical and acid stimulation of a stage II night-phase (CT 1415) cell (a and b) and a stage III early day-phase (CT 0530) cell (c and d). The outline of the day-phase cell was traced in white from a photograph of the same backlit cell. The night-phase cell received 12 mechanical stimuli and responded with one FF and 1 1 SFs. The response shown (a) was the eleventh SF. It was immediately followed by acid stimulation (b), which appears dimmer because t
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 430 E. A. WIDDER AND J. F. CASE Mechanical Acid O). 05 Q CO LU FIGURE 4. Mechanical and acid stimulation of a stage II night-phase (CT 1415) cell (a and b) and a stage III early day-phase (CT 0530) cell (c and d). The outline of the day-phase cell was traced in white from a photograph of the same backlit cell. The night-phase cell received 12 mechanical stimuli and responded with one FF and 1 1 SFs. The response shown (a) was the eleventh SF. It was immediately followed by acid stimulation (b), which appears dimmer because the luminescence was partially fatigued. The day-phase cell received 5 mechanical stimuli, but apparently responded only to the first stimulus (c). Acid stimulation (d) followed mechanical stimulation as in the night-phase cell. The PMT recordings of the mechanically stimulated flashes are shown at the bottom right of (a) and (c). The time bar in (c), 50 ms, applies to both oscillographic records. Scale, at lower left, 50 duced luminescence from day-phase cells. This was about 10 times dimmer than from night-phase cells (Sweeney, 1981), and appeared as a bright, clearly defined glowing spot near the nuclear zone. The perinuclear glow appeared either round, diameter about 30 nm (Figs. 5c and f), elliptical or saddle-shaped, about 60-90 X 40-70 A*m (Figs. 5a and d). Depending on the orientation of the cell, the ellipse surrounded one or two dark areas probably representing the horseshoe-shaped, non- luminous nucleus. In the round form, the glow frequently exhibited an active, microsource-like substructure, appearing to "boil" (Figs. 5g-i). The round glow with substructure or the elliptical perinuclear glow appeared in all stages and frequently occurred sequentially in the same cell, with the elliptical glow preceding the appearance of substructure as in Figures 5a and c, or vice versa. At the onset of acid stimulation, individual sources could be seen that were easily di
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
