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  • Photosystem II  (1)
  • Photosystem II core complex  (1)
  • oxygen evolution  (1)
  • 1
    Electronic Resource
    Electronic Resource
    The effect of UV-B radiation on photosynthesis and respiration of phytoplankton, benthic macroalgae and seagrasses (1993)
    Springer
    Photosynthesis research 36 (1993), S. 17-23 
    Details
    ISSN: 1573-5079
    Keywords: oxygen evolution ; UV screening compounds ; variable fluorescence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Several species of marine benthic algae, four species of phytoplankton and two species of seagrass have been subjected to ultraviolet B irradiation for varying lengths of time and the effects on respiration, photosynthesis and fluorescence rise kinetics studied. No effect on respiration was found. Photosynthesis was inhibited to a variable degree in all groups of plants after irradiation over periods of up to 1 h and variable fluorescence was also inhibited in a similar way. The most sensitive plants were phytoplankton and deep-water benthic algae. Intertidal benthic algae were the least sensitive to UV-B irradiation and this may be related to adaptation, through the accumulation of UV-B screening compounds, to high light/high UV-B levels. Inhibition of variable fluorescence (Fv) of the fluorescence rise curve was a fast and sensitive indicator of UV-B damage. Two plants studied, a brown alga and a seagrass, showed very poor recovery of Fv over a period of 32 h.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00018071
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The effects of ultraviolet irradiation on P680+ reduction in PS II core complexes measured for individual S-states and during repetitive cycling of the oxygen-evolving complex (1996)
    Springer
    Photosynthesis research 49 (1996), S. 21-27 
    Details
    ISSN: 1573-5079
    Keywords: Photosystem II core complex ; P680+ reduction kinetics ; S-state ; ultraviolet radiation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Flash-induced absorbance measurements at 830 nm on both nanosecond and microsecond timescales have been used to characterise the effect of ultraviolet light on Photosystem II core particles. A combination of UV-A and UV-B, closely simulating the spectrum of sunlight below 350 nm, was found to have a primary effect on the donor side of P680. Repetitive measurements indicated reductions in the nanosecond components of the absorbance decay with a concomitant appearance and increase in the amplitude of a component with a 10 μs time constant attributed to slow reduction of P680+ by Tyrz when the function of the oxygen evolving complex is inhibited. Single-flash measurements show that the nanosecond components have amplitudes which vary with S-state. Increasing UV irradiation inhibited the amplitude of these components without changing their S-state dependence. In addition, UV irradiation resulted in a reduction in the total amplitude, with no change in the proportion of the 10 μs contribution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00029424
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    P680+ reduction in oxygen-evolving Photosystem II core complexes (1996)
    Springer
    Photosynthesis research 49 (1996), S. 209-221 
    Details
    ISSN: 1573-5079
    Keywords: Photosystem II ; core particle ; P680 ; 830 nm transient absorption ; S-states ; oxygen-evolving complex
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The kinetics of P680+ reduction in oxygen-evolving spinach Photosystem II (PS II) core particles were studied using both repetitive and single-flash 830 nm transient absorption. From measurements on samples in which PS II turnover is blocked, we estimate radical-pair lifetimes of 2 ns and 19 ns. Nanosecond single-flash measurements indicate decay times of 7 ns, 40 ns and 95 ns. Both the longer 40 ns and 95 ns components relate to the normal S-state controlled Yz → P680+ electron transfer dynamics. Our analysis indicates the existence of a 7 ns component which provides evidence for an additional process associated with modified interactions involving the water-splitting catalytic site. Corresponding microsecond measurements show decay times of 4 μs and 90 μs with the possibility of a small component with a decay time of 20–40 μs. The precise origin of the 4 μs component remains uncertain but appears to be associated with the water-splitting center or its binding site while the 90 μs component is assigned to P680+-QA − recombination. An amplitude and kinetic analysis of the flash dependence data gives results that are consistent with the current model of the oxygen-evolving complex.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00034782
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    Paper (German National Licenses)
    Fulltext
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