Microspectrophotometry of the photoreceptors of palaeognathous birds — the emu and the tinamou

@article{Sillman2004MicrospectrophotometryOT,
  title={Microspectrophotometry of the photoreceptors of palaeognathous birds — the emu and the tinamou},
  author={Arnold J. Sillman and David A. Bolnick and Laurence W. Haynes and Alfred E. Walter and Ellis R. Loew},
  journal={Journal of comparative physiology},
  year={2004},
  volume={144},
  pages={271-276}
}
SummaryWith the aid of a microspectrophotometer the visual pigments and oil globules in the retina of the emu (Dromiceius novae-hollandiae), the brushland tinamou (Nothoprocta c. cinerascens) and the Chilean tinamou (Nothoprocta perdicaria sanborni) were characterized. All three of these palaeognathous birds contain in their rods a typical rhodopsin with λmax near 500 nm. Each of these birds has cones containing iodopsin-like visual pigments with λmax in the 560–570 nm spectral region. No… 

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References

SHOWING 1-10 OF 23 REFERENCES
The ecology of cone pigments in teleost fishes
IODOPSIN
TLDR
The relatively rapid synthesis of iodopsin compared with rhodopsin parallels the relatively rapid dark adaptation of cones compared with rods, and a theoretical relation is derived which links the logarithm of the visual sensitivity with the concentration of visual pigment in the rods and cones.
The Avian Eye and its Adaptations
TLDR
This chapter is concerned with several of these adaptations, the most obvious of which are the oil droplet inclusions and glycogen deposits within their photoreceptors, the well-developed areae and foveae within their retina and the highly vascularized pecten within their vitreous body.
Microspectrophotometry of Photoreceptors
In nearly thirty intervening years we have not overcome the exasperation so poetically expressed by Gordon Walls, for in achieving the conditions of illumination under which our own cones “see”
Vitamin A1/A2-based visual pigment mixtures in cones of the rudd
Evolution of flightless land birds on southern continents: Transferrin comparison shows monophyletic origin of ratites
TLDR
Quantitative immunological comparison of transferrin from ratites, tinamous, and other flying birds indicates that all the ratites and tinamous are allied phylogenetically and that they are of monophyletic origin relative to other birds.
...
1
2
3
...