FLUORESCENCE EMISSION OF MITOCHONDRIAL DPNH AS A FACTOR IN THE ULTRAVIOLET SENSITIVITY OF VISUAL RECEPTORS | Zendy

Britton Chance | Zendy

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FLUORESCENCE EMISSION OF MITOCHONDRIAL DPNH AS A FACTOR IN THE ULTRAVIOLET SENSITIVITY OF VISUAL RECEPTORS

Author(s) -

Britton Chance

Publication year - 1964

Publication title -

proceedings of the national academy of sciences

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 5.011

H-Index - 771

eISSN - 1091-6490

pISSN - 0027-8424

DOI - 10.1073/pnas.51.2.359

Subject(s) - biology , gene expression , context (archaeology) , gene , genetics , regulation of gene expression , fluorescence , evolutionary biology , physics , paleontology , quantum mechanics

The photodissociation of the CO compound of cytochrome a/sub 3/ at liquid nitrogen temperatures was demonstrated. Since the recombination of CO does not occur in a measurable rate at 77 deg K, the system provides a quantum counter for intracellular luminescence. A considerably higher uv sensitivity was found in mitochondrial suspensions and intact cells that contain DPNH than was observed in purified cytochrome oxidase (free of DPNH). Results are consistent with the viewpoint that excitation fluorescence of DPNH (maximum 340 m mu ) provides a highly efficient fluorescence emission in the region of 410--500 m mu . (H.M.G.)

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