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  • Alveolar-arterialPO2 difference  (1)
  • ECO2; Sub-seabed CO2 Storage: Impact on Marine Ecosystems  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Exercise-induced hypoxemia in athletes: Role of inadequate hyperventilation (1992)
    Springer
    European journal of applied physiology 65 (1992), S. 37-42 
    Details
    ISSN: 1439-6327
    Keywords: Alveolar-arterialPO2 difference ; Pulmonary gas exchange ; VO2max ; Hypoxia ; Hyperoxia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary These experiments examined the exercise-induced changes in pulmonary gas exchange in elite endurance athletes and tested the hypothesis that an inadequate hyperventilatory response might explain the large intersubject variability in arterial partial pressure of oxygen (P a02) during heavy exercise in this population. Twelve highly trained endurance cyclists [maximum oxygen consumption (VO2max) range = 65-77 ml·kg−1·min−1] performed a normoxic graded exercise test on a cycle ergometer toVO2max at sea level. During incremental exercise atVO2max 5 of the 12 subjects had ideal alveolar to arterial P02 gradients (P A-aO2) of above 5 kPa (range 5-5.7) and a decline from restingP aO2 (ΔP aO2) 2.4 kPa or above (range 2.4-2.7). In contrast, 4 subjects had a maximal exercise (P A-aO2) of 4.0-4.3 kPa with ΔP aO2 of 0.4-1.3 kPa while the remaining 3 subjects hadP A-aO2 of 4.3-5 kPa with ΔP aO2 between 1.7 and 2.0 kPa. The correlation between PAO2 andP aO2 atVO2max was 0.17. Further, the correlation between the ratio of ventilation to oxygen consumption VSP aO2 and arterial partial pressure of carbon dioxide VSP aO2 atVO2max was 0.17 and 0.34, respectively. These experiments demonstrate that heavy exercise results in significantly compromised pulmonary gas exchange in approximately 40% of the elite endurance athletes studied. These data do not support the hypothesis that the principal mechanism to explain this gas exchange failure is an inadequate hyperventilatory response.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01466272
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Biogeochemical investigation of Basiluzzo CO2 vents (Panarea, Italy) during ECO2 cruises from 2011-2013 (2017)
    PANGAEA
    In:  Supplement to: Molari, Massimiliano; Guilini, Katja; Lott, Christian; Weber, Miriam; de Beer, Dirk; Meyer, Stefanie; Ramette, Alban; Wegener, Gunter; Wenzhöfer, Frank; Martin, Daniel; Cibic, Tamara; De Vittor, Cinzia; Vanreusel, Ann; Boetius, Antje (2018): CO2 leakage alters biogeochemical and ecological functions of submarine sands. Science Advances, 4(2), eaao2040, https://doi.org/10.1126/sciadv.aao2040
    Details
    Publication Date: 2023-05-12
    Description: Subseabed CO2 storage is considered a future climate change mitigation technology. We investigated the ecological consequences of CO2 leakage for a marine benthic ecosystem. For the first time with a multidisciplinary integrated study, we tested hypotheses derived from a meta-analysis of previous experimental and in situ high-CO2 impact studies. For this, we compared ecological functions of naturally CO2-vented seafloor off the Mediterranean island Panarea (Tyrrhenian Sea, Italy) to those of nonvented sands, with a focus on biogeochemical processes and microbial and faunal community composition. High CO2 fluxes (up to 4 to 7 mol CO2 m−2 hour−1) dissolved all sedimentary carbonate, and comigration of silicate and iron led to local increases of microphytobenthos productivity (+450%) and standing stocks (+300%). Despite the higher food availability, faunal biomass (−80%) and trophic diversity were substantially lower compared to those at the reference site. Bacterial communities were also structurally and functionally affected, most notably in the composition of heterotrophs and microbial sulfate reduction rates (−90%). The observed ecological effects of CO2 leakage on submarine sands were reproduced with medium-term transplant experiments. This study assesses indicators of environmental impact by CO2 leakage and finds that community compositions and important ecological functions are permanently altered under high CO2.
    Keywords: ECO2; Sub-seabed CO2 Storage: Impact on Marine Ecosystems
    Type: Dataset
    Format: application/zip, 43 datasets
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    DATA PANGAEA
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