Why is the human visual system sensitive only to light of wavelengths from approximately 760 to 380 nm? An answer from thermochemistry and chemical kinetics.
Biophys Chem
; 83(3): 179-84, 2000 Jan 24.
Article
em En
| MEDLINE
| ID: mdl-10647848
ABSTRACT
The range of visible light has been explained by the knowledge available of gas-phase thermochemistry and chemical kinetics. The C, C-pi bond dissociation energy at the 11 and 12 positions of the rhodopsin complex is estimated to be approximately 37.4+/-1.5 kcal/mol. This energy is just equivalent to wavelength of the red limit of the visible light. The photons of the violet limit (approx. 75.2 kcal/mol) can break the weakest C-C and H-C bonds in important species involved in the photo-induced cis-trans isomerization cycle and can stop the visual cycle.
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Base de dados:
MEDLINE
Assunto principal:
Rodopsina
/
Visão Ocular
/
Luz
Tipo de estudo:
Diagnostic_studies
Limite:
Humans
Idioma:
En
Ano de publicação:
2000
Tipo de documento:
Article