. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 350 450 550 Wavelength (nm) 650 FIGURE 1. Spectral sensitivity curves of photoreceptor cells ofPamilirus argus based on intracellular recordings. The upper curve is an average of 6 cells and is log reciprocal photon flux (in relative units) for a criterion response of 2 mV; the lower curve is an average of 25 cells and is based on a criterion depolarization of 5 mV. In both cases the peak sensitivity is at about 510 nm. Error bars indicate ± As only a single spectral class of receptor was found in intracellular recordi
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 350 450 550 Wavelength (nm) 650 FIGURE 1. Spectral sensitivity curves of photoreceptor cells ofPamilirus argus based on intracellular recordings. The upper curve is an average of 6 cells and is log reciprocal photon flux (in relative units) for a criterion response of 2 mV; the lower curve is an average of 25 cells and is based on a criterion depolarization of 5 mV. In both cases the peak sensitivity is at about 510 nm. Error bars indicate ± As only a single spectral class of receptor was found in intracellular recording, experiments using the ERG were employed in order to unmask any possible con- tributions of other receptor types. The spectral sensitivity of the ERG of the dark- adapted eye was similar to the spectral sensitivity functions of individual cells, and the response-energy functions were parallel to each other at different wavelengths (not shown). But when the eye was adapted with colored lights and a very small criterion response employed, evidence appeared for a second type of receptor. The upper curve in Figure 3 is a spectral sensitivity function based on a 25 nV criterion response of the ERG from a dark adapted eye. When the eye was adapted with blue or orange background lights, however, the sensitivity not only decreased, but the shape of the spectral sensitivity function changed as well. Adaptation to long wave- lengths accentuated the secondary maximum at 370 nm, whereas adaptation to short wavelengths abolished it. This effect was observed only with very small criterion responses (~25 /zV). These experiments show the presence of two types of receptors, one having a maximum sensitivity in the green (Xmax 510 nm) and the other type. 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 Lab
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
