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  • Blackwell Publishing Ltd  (3)
  • Nature Publishing Group  (2)
Document type
Publisher
Years
  • 1
    Electronic Resource
    Electronic Resource
    The lower limit of photon fluence rate for phototrophic growth: the significance of ‘slippage’ reactions (1982)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 5 (1982), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract. The role of ‘slippage’ reactions, in the form of passive H+ uniport through CF0-CF1, ATP synthetase and breakdown of the S2 and S3 intermediates of O2 evolution, is considered in relation to the growth of phototrophic organisms at low photon fluence rates. Analysis of the limited data available suggests that adaptation (phenotypic or genotypic) to low photon fluence rates is accompanied by an increase in the ratio of light-absorbing pigments to the (potentially slippage-inducing) photosystem two units and CF0-CF1 ATP synthetases. Furthermore, organisms which are genotypically adapted to high photon fluence rates do not, when grown at low photon fluence rates, achieve the same low ratio of reaction centres to total light-harvesting pigments as is found in phototrophs genotypically adapted to low photon fluence rates. The limits to, and energy costs of, such a mechanism of adaptation to low photon fluence rates are also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/1365-3040.ep11571479
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Mapping of nutrient-induced biochemical changes in living algal cells using synchrotron infrared microspectroscopy (2005)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 249 (2005), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: High quality Fourier transform infrared (FTIR) spectra were acquired from living Micrasterias hardyi cells maintained in an IR transparent flow-through cell using a FTIR microscope coupled to a synchrotron light source. Spectral maps of living, nutrient-replete cells showed band intensities consistent with the known location of the nucleus and the chloroplasts. These were very similar to maps acquired from fixed, air-dried cells. Bands due to lipids were lowest in absorbance in the region of the nucleus and highest in the chloroplast region and this trend was reversed for the absorbance of bands attributed to protein. Spectra acquired in 10 μm steps across living phosphorus-starved (P-starved) cells, repeated approximately every 30 min, were consistent over time, and bands correlated well with the known position of the nucleus and the observed chloroplasts, corroborating the observations with replete cells. Experiments in which missing nutrients were re-supplied to starved cells showed that cells could be maintained in a functional state in the flow-through cell for up to one day. Nitrogen-starved cells re-supplied with N showed an increase in lipid in all positions measured across the cell over a 23 h period of re-supply, with the largest increases occurring in positions where the chloroplasts were observed. Re-supply of phosphorus to P-starved cells produced no changes in bands attributable to lipid or protein. Due to their thin cell body (?12 μm) and large diameter (?300 μm) Micrasterias sp. make an ideal spectroscopic model to study nutrient kinetics in algal cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/j.femsle.2005.06.021
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The intrinsic permeability of biological membranes to H+: Significance for the efficiency of low rates of energy transformation (1981)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 10 (1981), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1981.tb06194.x
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Carbon fixation Photosynthesis in a marine diatom (2001)
    [s.l.] : Nature Publishing Group
    Nature 412 (2001), S. 40-41 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The first stable product of photosynthetic carbon fixation by land plants is either the three-carbon molecule phosphoglycerate (in C3 plants) or the four-carbon compounds malate or aspartate (in C4 and CAM (crassulacean-acid metabolism) plants). Reinfelder et al. infer ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/35083694
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    Paper (German National Licenses)
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  • 5
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    Ocean acidification increases the accumulation of toxic phenolic compounds across trophic levels (2015)
    Nature Publishing Group
    In:  Nature Communications, 6 (8714).
    Details
    Publication Date: 2019-09-23
    Description: Increasing atmospheric CO2 concentrations are causing ocean acidification (OA), altering carbonate chemistry with consequences for marine organisms. Here we show that OA increases by 46–212% the production of phenolic compounds in phytoplankton grown under the elevated CO2 concentrations projected for the end of this century, compared with the ambient CO2 level. At the same time, mitochondrial respiration rate is enhanced under elevated CO2 concentrations by 130–160% in a single species or mixed phytoplankton assemblage. When fed with phytoplankton cells grown under OA, zooplankton assemblages have significantly higher phenolic compound content, by about 28–48%. The functional consequences of the increased accumulation of toxic phenolic compounds in primary and secondary producers have the potential to have profound consequences for marine ecosystem and seafood quality, with the possibility that fishery industries could be influenced as a result of progressive ocean changes
    Type: Article , PeerReviewed
    Format: text
    Format: text
    DOI: 10.1038/ncomms9714
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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