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  • 1
    Electronic Resource
    Electronic Resource
    Electron Transfer from the Acceptor A1 to the Iron-Sulfur Centers in Photosystem I As Studied by Transient EPR Spectroscopy (1994)
    s.l. : American Chemical Society
    Biochemistry 33 (1994), S. 11789-11797 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00205a015
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Anisotropic electron spin polarization of correlated spin pairs in photosynthetic reaction centers (1989)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 93 (1989), S. 1612-1619 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100341a084
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Transient electron paramagnetic resonance of the triplet state of P700 in photosystem I: Evidence for triplet delocalization at room temperature (1993)
    s.l. : American Chemical Society
    Biochemistry 32 (1993), S. 4842-4847 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00069a020
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    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Nanosecond time-resolved magnetic resonance of the primary radical pair state PF of bacterial photosynthesis (1983)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 105 (1983), S. 2903-2904 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00347a067
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    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Controlling the duration of photosynthetic charge separation with microwave radiation (1983)
    [s.l.] : Nature Publishing Group
    Nature 303 (1983), S. 520-522 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Photoexcitation of the reaction centre protein from purple photosynthetic bacteria results in rapid (〉5 ps) formation of a radical pair, PF composed of an oxidized bacteriochlorophyll a dimer, P* and a reduced bacteriopheophytin a molecule, I (ref. 2). If the endogenous quinone molecules in ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/303520a0
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    Paper (German National Licenses)
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  • 6
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    Impact of Ocean Acidification on Energy Metabolism of Oyster, Crassostrea gigas—Changes in Metabolic Pathways and Thermal Response (2010)
    MDPI
    In:  Marine Drugs, 8 (8). pp. 2318-2339.
    Details
    Publication Date: 2020-07-14
    Description: Climate change with increasing temperature and ocean acidification (OA) poses risks for marine ecosystems. According to Portner and Farrell [1], synergistic effects of elevated temperature and CO(2)-induced OA on energy metabolism will narrow the thermal tolerance window of marine ectothermal animals. To test this hypothesis, we investigated the effect of an acute temperature rise on energy metabolism of the oyster, Crassostrea gigas chronically exposed to elevated CO(2) levels (partial pressure of CO(2) in the seawater similar to 0.15 kPa, seawater pH similar to 7.7). Within one month of incubation at elevated PCO(2) and 15 degrees C hemolymph pH fell (pH(e) = 7.1 +/- 0.2 (CO(2)-group) vs. 7.6 +/- 0.1 (control)) and P(e)CO(2) values in hemolymph increased (0.5 +/- 0.2 kPa (CO(2)-group) vs. 0.2 +/- 0.04 kPa (control)). Slightly but significantly elevated bicarbonate concentrations in the hemolymph of CO(2)-incubated oysters ([HCO(3)(-)](e) = 1.8 +/- 0.3 mM (CO(2)-group) vs. 1.3 +/- 0.1 mM (control)) indicate only minimal regulation of extracellular acid-base status. At the acclimation temperature of 15 degrees C the OA-induced decrease in pHe did not lead to metabolic depression in oysters as standard metabolism rates (SMR) of CO(2)-exposed oysters were similar to controls. Upon acute warming SMR rose in both groups, but displayed a stronger increase in the CO(2)-incubated group. Investigation in isolated gill cells revealed a similar temperature-dependence of respiration between groups. Furthermore, the fraction of cellular energy demand for ion regulation via Na(+)/K(+)-ATPase was not affected by chronic hypercapnia or temperature. Metabolic profiling using (1)H-NMR spectroscopy revealed substantial changes in some tissues following OA exposure at 15 degrees C. In mantle tissue alanine and ATP levels decreased significantly whereas an increase in succinate levels was observed in gill tissue. These findings suggest shifts in metabolic pathways following OA-exposure. Our study confirms that OA affects energy metabolism in oysters and suggests that climate change may affect populations of sessile coastal invertebrates such as mollusks.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.3390/md8082318
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 7
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    Impact of ocean acidification on escape performance of the king scallop, Pecten maximus, from Norway (2013)
    Springer
    In:  Marine Biology, 160 (8). pp. 1995-2006.
    Details
    Publication Date: 2014-09-01
    Description: The ongoing process of ocean acidification already affects marine life, and according to the concept of oxygen and capacity limitation of thermal tolerance, these effects may be intensified at the borders of the thermal tolerance window. We studied the effects of elevated CO2 concentrations on clapping performance and energy metabolism of the commercially important scallop Pecten maximus. Individuals were exposed for at least 30 days to 4 °C (winter) or to 10 °C (spring/summer) at either ambient (0.04 kPa, normocapnia) or predicted future PCO2 levels (0.11 kPa, hypercapnia). Cold-exposed (4 °C) groups revealed thermal stress exacerbated by PCO2 indicated by a high mortality overall and its increase from 55 % under normocapnia to 90 % under hypercapnia. We therefore excluded the 4 °C groups from further experimentation. Scallops at 10 °C showed impaired clapping performance following hypercapnic exposure. Force production was significantly reduced although the number of claps was unchanged between normocapnia- and hypercapnia-exposed scallops. The difference between maximal and resting metabolic rate (aerobic scope) of the hypercapnic scallops was significantly reduced compared with normocapnic animals, indicating a reduction in net aerobic scope. Our data confirm that ocean acidification narrows the thermal tolerance range of scallops resulting in elevated vulnerability to temperature extremes and impairs the animal’s performance capacity with potentially detrimental consequences for its fitness and survival in the ocean of tomorrow.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1007/s00227-012-2057-8
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 8
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    Using the critical salinity (S crit) concept to predict invasion potential of the anemone Diadumene lineata in the Baltic Sea (2016)
    Springer
    In:  Marine Biology, 163 (11, Art. No. 227).
    Details
    Publication Date: 2019-09-23
    Description: It is widely assumed that the ability of an introduced species to acclimate to local environmental conditions determines its invasion success. The sea anemone Diadumene lineata is a cosmopolitan invader and shows extreme physiological tolerances. It was recently discovered in Kiel Fjord (Western Baltic Sea), although the brackish conditions in this area are physiologically challenging for most marine organisms. This study investigated salinity tolerance in D. lineata specimens from Kiel Fjord in order to assess potential geographical range expansion of the species in the Baltic Sea. In laboratory growth assays, we quantified biomass change and asexual reproduction rates under various salinity regimes (34: North Sea, 24: Kattegat, 14: Kiel Fjord, 7: Baltic Proper). Furthermore, we used 1H-NMR-based metabolomics to analyse intracellular osmolyte dynamics. Within four weeks D. lineata exhibited a fivefold population growth through asexual reproduction at high salinities (34 and 24). Biomass increase under these conditions was significantly higher (69 %) than at a salinity of 14. At a salinity of 7, anemones ceased to reproduce asexually, their biomass decreased and metabolic depression was observed. Five main intracellular osmolytes were identified to be regulated in response to salinity change, with osmolyte depletion at a salinity of 7. We postulate that depletion of intracellular osmolytes defines a critical salinity (Scrit) that determines loss of fitness. Our results indicate that D. lineata has the potential to invade the Kattegat and Skagerrak regions with salinity 〉10. However, salinities of the Baltic Proper (salinity 〈8) currently seem to constitute a physiological limit for the species.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1007/s00227-016-2989-5
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 9
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    9-Methyl-ß-Carboline-Induced Cognitive Enhancement Is Associated With Elevated Hippocampal Dopamine Levels and Dendritic and Synaptic Proliferation (2012)
    Wiley-Blackwell
    Details
    Publication Date: 2012-04-16
    Description: ß-Carbolines (BCs) belong to the heterogenous family of carbolines, which have been found exogenously, i.e. in various fruits, meats, tobacco smoke, alcohol and coffee, but also endogenously, i.e. blood, brain and cerebrospinal fluid. These exogenous and endogenous BCs and some of their metabolites can exert neurotoxic effects, however, an unexpected stimulatory effect of 9-methyl-ß-carboline (9-me-BC) on dopaminergic neurons in primary mesencephalic cultures was recently discovered. The aim of the present study was to extend our knowledge on the stimulatory effects of 9-me-BC and to test the hypothesis that 9-me-BC may act as a cognitive enhancer. We found that 10 days (but not 5 days) of pharmacological treatment with 9-me-BC i) improves spatial learning in the radial maze, ii) elevates dopamine levels in the hippocampal formation, and iii) results after 10 days of treatment in elongated, more complex dendritic trees and higher spine numbers on granule neurons in the dentate gyrus of 9-me-BC-treated rats. Our results demonstrate that beyond its neuroprotective/neurorestorative and anti-inflammatory effects, 9-me-BC acts as a cognitive enhancer in a hippocampus-dependent task, and that the behavioral effects may be associated with a stimulatory impact on hippocampal dopamine levels and dendritic and synaptic proliferation. © 2012 The Authors Journal of Neurochemistry © 2012 International Society for Neurochemistry
    Print ISSN: 0022-3042
    Electronic ISSN: 1471-4159
    Topics: Medicine
    Published by Wiley-Blackwell on behalf of The International Society for Neurochemistry.
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    PAPER CURRENT
  • 10
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    Temperature-dependent oxygen extraction from the ventilatory current and the costs of ventilation in the cephalopod Sepia officinalis (2006)
    Springer
    In:  Journal of Comparative Physiology B, 176 (7). pp. 607-621.
    Details
    Publication Date: 2021-09-03
    Description: Earlier work found cuttlefish (Sepia officinalis) ventilatory muscle tissue to progressively switch to an anaerobic mode of energy production at critical temperatures (T c) of 7.0 and 26.8°C. These findings suggested that oxygen availability limits thermal tolerance. The present study was designed to elucidate whether it is the ventilatory apparatus that sets critical temperature thresholds during acute thermal stress. Routine metabolic rate (rmr) rose exponentially between 11 and 23°C, while below (8°C) and above (26°C) this temperature range, rmr was significantly depressed. Ventilation frequency (f V) and mean mantle cavity pressure (MMP) followed an exponential relationship within the entire investigated temperature range (8–26°C). Oxygen extraction from the ventilatory current (EO2) decreased in a sigmoidal fashion with temperature, falling from 〉 90% at 8°C to 32% at 26°C. Consequently, ventilatory minute volume (MVV) increased by a factor of 20 from 7 to 150% body weight min−1 in the same temperature interval. Increases in MMP and MVV resulted in ventilatory muscle power output (P out) increasing by a factor of 〉 80 from 0.03 to 2.4 mW kg−1 animal. Nonetheless, costs for ventilatory mechanics remain below 1.5% rmr in the natural thermal window of the population (English Channel, 9–17°C), owing to very low MMPs of 〈 0.05 kPa driving the ventilatory stream, and may maximally rise to 8.6% rmr at 26°C. Model calculations suggest that the ventilatory system can maintain high arterial PO2 values of 〉 14 kPa over the entire temperature interval. We therefore conclude that the cuttlefish ventilation system is probably not limiting oxygen transfer during acute thermal stress. Depression of rmr, well before critical temperatures are being reached, is likely caused by circulatory capacity limitations and not by fatigue of ventilatory muscle fibres.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1007/s00360-006-0084-9
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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