Fluorescence and photochemical quenching in photosynthetic reaction centers.
نویسندگان
چکیده
منابع مشابه
Fluorescence and photochemical quenching in photosynthetic reaction centers.
Photosynthetic bacteria contain bacteriochlorophyll (BChl) that absorbs light and delivers the resulting singlet excitation energy to photochemical reaction centers.' The reaction centers, which have been isolated in a form free of lightharvesting BChl,'-3 contain a photochemically specialized BChl which in Rhodopseudomonas spheroides is called P870 after its absorption maximum near 870 nm. Exc...
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The change in absorbance (hole spectrum) of the primary electron donor (P870) in bacterial photosynthetic reaction centers has been studied at 1.5-2.1 K following narrow-band excitation at several wavelengths within the P870 absorption band. The hole width is very large, suggesting a homogeneous linewidth on the order of 200-300 cm-‘. Possible interpretations of this highly unusual result, incl...
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The spontaneous fluorescence from the special pair primary electron donor in bacterial photosynthetic reaction centers has been measured at low temperature using fluorescence up-conversion following excitation of the special pair with 80 fs pulses from a mode-locked Ti:sapphire laser. Oscillations are observed during the first few picoseconds of the decay. The frequency of the oscillations and ...
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The p-hydroxybenzoic acid (BA) is a widespread phenolic compound often cited as allelochemical [1], released into soil by root exudates of Avena fatua [2], leaf leachates, and decomposed plant tissues of Triticum aestivum L. [3]. Because of the herbicidal potential of BA on crops [4] and weed species [5], commercially available BA was tested on photosynthetic efficiency, yield and non-photochem...
متن کاملPhotosynthetic reaction centers.
The capture of solar radiation and the conversion of its free energy into chemical energy involves a sequence of reactions that occur within a physical structure called the photosynthetic RC. Following the initial capture of a photon by antenna pigments, the photon is transferred to the RC pigments, where it gives rise to a separation and stabilization of charge across the photosynthetic membra...
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ژورنال
عنوان ژورنال: Proceedings of the National Academy of Sciences
سال: 1968
ISSN: 0027-8424,1091-6490
DOI: 10.1073/pnas.61.4.1243