Document Detail

Retinal photoreceptors of paleognathous birds: the ostrich (Struthio camelus) and rhea (Rhea americana).
MedLine Citation:
PMID:  11163611     Owner:  NLM     Status:  MEDLINE    
Microspectrophotometry was used to determine the absorbance spectra of both rod and cone visual pigments and oil droplets from the retinae of the ostrich (Struthio camelus) and rhea (Rhea americana). Light and fluorescence microscopy of whole fresh tissue mounts were used to determine the relative numbers and distribution of oil droplets in the retinae. Both species possessed rods, double cones and four classes of single cone identified by their oil droplets. The rods had lambda max at about 505 nm, whereas three cone pigments were recorded with lambda max at 570, 505 and 445 nm. The P570 pigment was located in both members of the double cones and in a class of single cone containing an R-type oil droplet (lambda cut at 555 nm). The P505 and P445 cone pigments were found in populations of single cones containing Y-type and C-type oil droplets (lambda cut of 500 and 420 nm, respectively). The fourth class of single cone contained a T-type droplet and in the ostrich contained a visual pigment with lambda max at about 405 nm. Double cones possessed a P-type droplet in the principal member and an A-type droplet in the accessory member. The complement of visual pigments and oil droplets, and the ratio of cone types in the ostrich and rhea, are remarkably similar to those found in many groups of neognathous birds.
M W Wright; J K Bowmaker
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Vision research     Volume:  41     ISSN:  0042-6989     ISO Abbreviation:  Vision Res.     Publication Date:  2001 Jan 
Date Detail:
Created Date:  2001-02-08     Completed Date:  2001-02-22     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0417402     Medline TA:  Vision Res     Country:  England    
Other Details:
Languages:  eng     Pagination:  1-12     Citation Subset:  IM    
Department of Visual Science, Institute of Ophthalmology, University College London, Bath Street, London EC1V 9EL, UK.
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MeSH Terms
Microscopy, Fluorescence
Oils / analysis
Photoreceptor Cells, Vertebrate / chemistry,  cytology,  physiology*
Pigment Epithelium of Eye / chemistry
Rheiformes / anatomy & histology,  physiology*
Spectrum Analysis
Struthioniformes / anatomy & histology,  physiology*
Reg. No./Substance:

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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