. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Sl'BUXIT COORDINATION I \T 44'). FIGURE 2. Coordination of the two segmental light organs. The two segments sometimes light asynchronous!}-, as illustrated here. Time between frames is 16 ± 2 msec. Only frames 1-5 and 11-15 of a 17-frame flash are shown. The anterior organ turns on 2-3 frames ( 32-4S msec) ahead of the posterior. Calibration bar — 1 mm. For orientation of the field of the •firefly, see Figure 1 (large circle). been required using conventional optics (Reynolds, 1(H>S). The image tube has an inpu
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Sl'BUXIT COORDINATION I \T 44'). FIGURE 2. Coordination of the two segmental light organs. The two segments sometimes light asynchronous!}-, as illustrated here. Time between frames is 16 ± 2 msec. Only frames 1-5 and 11-15 of a 17-frame flash are shown. The anterior organ turns on 2-3 frames ( 32-4S msec) ahead of the posterior. Calibration bar — 1 mm. For orientation of the field of the •firefly, see Figure 1 (large circle). been required using conventional optics (Reynolds, 1(H>S). The image tube has an input cathode one inch in diameter and the electron optics result in a magnifica- tion of approximately 0.^5. The tube is capable of resolving 25 line pairs per milli- meter at the input. The dark current (or noise) introduced by the intensifier •consists mainly of single electrons emitted from the cathode surface, which resttlt in bright spots of light approximately 40 microns in diameter on the output phosphor. However, about 5% of the noise spots are significantly larger than this and result from multiple electron emissions from the cathode dtie to ion bombardment. Thus, when the signal consists of nearly circular spots, it is important that optical magnification in the system occur before the intensifier cathode. In the present work this magnification (3x, 20x, and lOOx) wa^ accomplished by the objectives of the microscope. The anode was photographed with a H> mm Bolex movie camera at 32 or 64 frames/sec. Calibration of the shutter cycle of the camera indicated consider- able variability; however, periods of constant shutter speed occurred when the •camera was neither accelerating after being turned on nor decelerating as the spring neared its unwound limit. In such periods the cycling interval was 16 ± 2 msec at "64 frames/sec" and 32 ± 4 msec at "32 ; All records were .selected from such periods of uniform shutter speed in the midd
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
