Heme Proteins: Quantum Yield Determined by the Pulse Method
We report results of the application of the “pulse method” to the study of photodissociation of various ligands from several heme proteins. By use of this technique, which allows the determination of the quantum yield of photodissociation accurately and rapidly, several ligands (CO, O2, isocyanides)...
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ftpubmed:oai:pubmedcentral.nih.gov:427188 2023-05-15T18:26:44+02:00 Heme Proteins: Quantum Yield Determined by the Pulse Method Brunori, Maurizio Giacometti, Giorgio M. Antonini, Eraldo Wyman, Jeffries 1973-11 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC427188 http://www.ncbi.nlm.nih.gov/pubmed/4361678 en eng http://www.ncbi.nlm.nih.gov/pmc/articles/PMC427188 http://www.ncbi.nlm.nih.gov/pubmed/4361678 Biological Sciences: Biochemistry Text 1973 ftpubmed 2013-08-29T23:59:53Z We report results of the application of the “pulse method” to the study of photodissociation of various ligands from several heme proteins. By use of this technique, which allows the determination of the quantum yield of photodissociation accurately and rapidly, several ligands (CO, O2, isocyanides) have been investigated for sperm-whale myoglobin and trout hemoglobin I. In agreement with previous results, the new data lead to the conclusion that no simple relationship exists between the quantum yield and the affinity constant in the ground state. For trout hemoglobin I, the experiments were extended to measure the quantum yield of the CO photodissociation as a function of the initial degree of saturation, from fully saturated down to the initial values of about 1.5%. The results yield additional information to that obtained by the “steady-state” method, and in particular exclude the idea that the photochemical yield is in any way dependent on the fractional saturation of the molecule with carbon monoxide. Text Sperm whale PubMed Central (PMC) |
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Biological Sciences: Biochemistry |
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Biological Sciences: Biochemistry Brunori, Maurizio Giacometti, Giorgio M. Antonini, Eraldo Wyman, Jeffries Heme Proteins: Quantum Yield Determined by the Pulse Method |
topic_facet |
Biological Sciences: Biochemistry |
description |
We report results of the application of the “pulse method” to the study of photodissociation of various ligands from several heme proteins. By use of this technique, which allows the determination of the quantum yield of photodissociation accurately and rapidly, several ligands (CO, O2, isocyanides) have been investigated for sperm-whale myoglobin and trout hemoglobin I. In agreement with previous results, the new data lead to the conclusion that no simple relationship exists between the quantum yield and the affinity constant in the ground state. For trout hemoglobin I, the experiments were extended to measure the quantum yield of the CO photodissociation as a function of the initial degree of saturation, from fully saturated down to the initial values of about 1.5%. The results yield additional information to that obtained by the “steady-state” method, and in particular exclude the idea that the photochemical yield is in any way dependent on the fractional saturation of the molecule with carbon monoxide. |
format |
Text |
author |
Brunori, Maurizio Giacometti, Giorgio M. Antonini, Eraldo Wyman, Jeffries |
author_facet |
Brunori, Maurizio Giacometti, Giorgio M. Antonini, Eraldo Wyman, Jeffries |
author_sort |
Brunori, Maurizio |
title |
Heme Proteins: Quantum Yield Determined by the Pulse Method |
title_short |
Heme Proteins: Quantum Yield Determined by the Pulse Method |
title_full |
Heme Proteins: Quantum Yield Determined by the Pulse Method |
title_fullStr |
Heme Proteins: Quantum Yield Determined by the Pulse Method |
title_full_unstemmed |
Heme Proteins: Quantum Yield Determined by the Pulse Method |
title_sort |
heme proteins: quantum yield determined by the pulse method |
publishDate |
1973 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC427188 http://www.ncbi.nlm.nih.gov/pubmed/4361678 |
genre |
Sperm whale |
genre_facet |
Sperm whale |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC427188 http://www.ncbi.nlm.nih.gov/pubmed/4361678 |
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1766208709919244288 |