Zobrazeno 1 - 10
of 23
pro vyhledávání: '"William W. Parson"'
Using molecular dynamics simulations and steady-state fluorescence spectroscopy, we have identified a conformational change in the active site of a thermophilic flavoenzyme, NADH oxidase from Thermus thermophilus HB8 (NOX). The enzyme's far-UV circul
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b8f383515da9de91b20010cfed4cc1c2
https://europepmc.org/articles/PMC3288523/
https://europepmc.org/articles/PMC3288523/
Publikováno v:
Biochemistry. 31(33)
The primary electron donor in the reaction center of purple photosynthetic bacteria consists of a pair of bacteriochlorophylls (PL and PM). The oxidized dimer (P+) is expected to have an absorption band in the mid-IR, whose energy and dipole strength
The quantum yield of flash-induced proton release by bacteriorhodopsin-containing membrane fragments
Autor:
Donald R. Ort, William W. Parson
Publikováno v:
Biophysical Journal. 25:341-353
The quantum yield of proton release by bacteriorhodopsin was measured from volume changes after excitation of purple membrane fragments by short flashes. At low ionic strengths, about 0.25 mol of protons is released per einstein absorbed. This agrees
Publikováno v:
Biochimica et Biophysica Acta (BBA) - Bioenergetics. 408:189-199
Purified photochemical reaction centers from three strains of Rhodopseudomonas sphaeroides and two of Rhodospirillum rubrum were reduced with Na2S2O4 so as to block their photochemical electron transfer reactions. They then were excited with flashes
Autor:
William W. Parson, Neal W. Woodbury
Publikováno v:
Biochimica et Biophysica Acta (BBA) - Bioenergetics. 850:197-210
Single-photon counting techniques were used to measure the fluorescence decay from Rhodopseudomonas sphaeroides and Rhodospirillum rubrum chromatophores after excitation with a 25-ps, 600-nm laser pulse. Electron transfer was blocked beyond the initi
Autor:
William W. Parson, Curtis W. Hoganson, Craig C. Schenck, Richard L. Fork, Charles V. Shank, Dewey Holten, Maurice W. Windsor, Arnold Migus
Publikováno v:
Biochimica et Biophysica Acta (BBA) - Bioenergetics. 592:461-477
The primary electron transfer processes in isolated reaction centers of Rhodopseudomonas sphaeroides have been investigated with subpicosecond and picosecond spectroscopic techniques. Spectra and kinetics of the absorbance changes following excitatio
Autor:
Donald R. Ort, William W. Parson
Publikováno v:
Biophysical Journal. 25:355-364
We have used a capacitor microphone calorimeter to measure rapid enthalpy changes that occur when bacteriorhodopsin-containing membrane fragments are excited with short flashes of light. We resolved the enthalpy changes into three phases. At about 10
Publikováno v:
Biochimica et Biophysica Acta (BBA) - Bioenergetics. 387:265-278
In preparations of photochemical reaction centers from Rhodopseudomonas spheroides R-26, lowering the recox potential so as to reduce the primary electron acceptor prevents the photochemical transfer of an electron from bacteriochlorophyll to the acc
Publikováno v:
Biochimica et Biophysica Acta (BBA) - Bioenergetics. 635:383-392
Photosynthetic reaction centers isolated from Rhodopseudomonas sphaeroides strain R-26 were excited with non-saturating 7-ps, 600-nm flashes under various conditions, and the resulting absorbance changes were measured. If the quinone electron accepto
Publikováno v:
Biochimica et Biophysica Acta (BBA) - Bioenergetics. 545:429-444
Reaction centers from Rhodopseudomonas sphaeroides strain R-26 were prepared with varying Fe and ubiquinone (Q) contents. The photooxidation of P-870 to P-870+ was found to occur with the same quantum yield in Fe-depleted reaction centers as in contr