Rays have more than one photopigment
and so they have the retinal 'machinery' for colour vision," Hart said.
The parameters showing the largest effects of bright light exposure were clearly the ratios of the long wave-length to short wavelength photopigment weighting factors that are indicative of the relative value of the two photopigments to the composite curve.
Likewise, we know of no microspectrophotometry studies detailing the absorbance maxima of photopigments in juvenile or adult Pacific halibut retinas.
In contrast, exposure to bright light significantly reduced retinal light sensitivity of Pacific halibut, predominately by affecting the photopigment which absorbs the green wavelengths of light (-520-580 nm) most strongly.
A minority of dichromats has two identical genes at the head of the array or two genes that code photopigments with the minimal peak wavelength separation of 3-4nm.
Severity of deficiency varies according to the peak wavelengths of the photopigments and loss of hue discrimination ability is inversely proportional to the peak wavelength separation.
These new indicators include such metrics as diagnostic photopigments of algal functional groups to assess eutrophication (Paerl et al.
For example, analyses of photopigments provide a means to explicitly link nutrient and hydrologic stressors with specific phytoplankton groups and over explicit spatial scales when combined with remote sensing information.
This trichromatic theory of vision assumes that people inherit a separate gene for each of the three photopigments
66-68) This has been attributed to the existence of a range of hybrid opsin genes which encode a range of photopigments with different peak spectral sensitivities.
10-14) The [lambda]max of the cone spectral sensitivities obtained in this way are shifted compared to those of the photopigment spectra (Figure 3).