Abstract：
:Microspectrophotometry (MSP) shows rhodopsin highly concentrated (about 3.0 mmol/l) in rod outer segments (ROS). Calculation of the in vivo absorption spectrum of human rhodopsin from such data reveals a striking failure to agree with the action spectrum of human rod vision. Agreement is good between the spectral distribution of absorption coefficients and the action spectrum, but the "concentration-broadening" (or "self-screening") introduced by the high end on absorbance at this concentration results in a misfit among the largest in the 93 years comparisons of this kind have been made! To deal with this anomaly, it has been suggested that "concentration-broadening" is inappropriate for rhodopsin in rod vision. This proposal was tested by comparing rod action spectra of 15-day-old and adult rats, since the lengths of ROS increase by a factor of about two in maturation. Three lines of evidence are inconsistent with it. Although the conundrum remains unexplained, it cannot be dismissed by supposing "self-screening" inappropriate for night vision.
journal_name
Vision Resjournal_title
Vision researchauthors
Alpern M,Fulton AB,Baker BNdoi
10.1016/0042-6989(87)90155-6subject
Has Abstractpub_date
1987-01-01 00:00:00pages
1459-70issue
9eissn
0042-6989issn
1878-5646pii
0042-6989(87)90155-6journal_volume
27pub_type
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