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1. Positronium collisions with O2 and CO2

   R. S. Wilde, H. B. (July 2021, Physical review)
2. Biological signatures in clumped isotopes of O2

   https://doi.org/10.1126/science.aaa6284  

   Yeung, L. Y.; Ash, J. L.; Young, E. D. (April 2015, Science)
3. Dissolved O2 concentration and O2/N2 saturation ratio in surface seawater measured in the Bering and Chukchi Seas May-June 2021

   https://doi.org/10.18739/A2Q52FF1V  

   Juranek, Laurie (January 2022, NSF Arctic Data Center)

   These data files contain surface dissolved oxygen (O2) concentration and dissolved oxygen/nitrogen (O2/N2) saturation ratio for the Bering and Chukchi Seas with relevant accompanying ancillary information. The data are useful for understanding the balance of physical and biological controls driving surface ocean dissolved O2 concentrations and for calculating net biological community production rates. The data were collected with funding from National Science Foundation (NSF) Award 1928684 “High Resolution Observing of Arctic Net Community Productivity with Ships of Opportunity.” Data were collected between May 21st, 2021 and June 13th, 2021 from the surface uncontaminated seawater supply of R/V Sikuliaq on Cruise ID SKQ202108S. Data were collected near-continuously using Pro-Oceanus miniTDGP (total dissolved gas pressure instrument), a SBE45 thermosalinograph, and an Aanderaa optode (4330) dissolved O2 sensor, with occasional outages for instrument maintenance or flow disruptions. The cruise departed from Dutch Harbor, Alaska (AK) and returned to Seward, AK and sampled waters of the Bering and Chukchi Seas. 

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4. Surface underway dissolved O2/Ar and O2 data collected in the Bering, Chukchi, and Beaufort Seas in October-November 2020 on SKQ202014S

   https://doi.org/10.18739/A23B5W91Q  

   Juranek, Laurie (January 2022, NSF Arctic Data Center)

   These data files contain surface dissolved O2 (Oxygen) concentration and dissolved O2/Ar (Oxygen/Argon) saturation ratio for the Bering, Chukchi, and Beaufort Seas with relevant accompanying ancillary information. The data are useful for understanding the balance of physical and biological controls driving surface ocean dissolved O2 concentrations and for calculating net biological community production rates. The data were collected with funding from NSF (National Science Foundation) Award 1928684 “High Resolution Observing of Arctic Net Community Productivity with Ships of Opportunity” Data were collected between October 17th, 2020 and November 16th, 2020 from the surface uncontaminated seawater supply of R/V (Research Vessel) Sikuliaq on Cruise ID (Identifier) SKQ202014S. Data were collected near-continuously using an equilibrated inlet mass spectrometer (EIMS) and an Aanderaa optode, with occasional outages for instrument maintenance or flow disruptions. The cruise departed and returned from Seward, AK (Alaska) and sampled waters of the Bering, Chukchi and southern Beaufort Seas. 

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5. The adaptive benefit of evolved increases in hemoglobin-O2 affinity is contingent on tissue O2 diffusing capacity in high-altitude deer mice

   https://doi.org/10.1186/s12915-021-01059-4  

   Wearing, Oliver H.; Ivy, Catherine M.; Gutiérrez-Pinto, Natalia; Velotta, Jonathan P.; Campbell-Staton, Shane C.; Natarajan, Chandrasekhar; Cheviron, Zachary A.; Storz, Jay F.; Scott, Graham R. (June 2021, BMC Biology)

   Abstract BackgroundComplex organismal traits are often the result of multiple interacting genes and sub-organismal phenotypes, but how these interactions shape the evolutionary trajectories of adaptive traits is poorly understood. We examined how functional interactions between cardiorespiratory traits contribute to adaptive increases in the capacity for aerobic thermogenesis (maximal O₂consumption,V̇O₂max, during acute cold exposure) in high-altitude deer mice (Peromyscus maniculatus). We crossed highland and lowland deer mice to produce F₂inter-population hybrids, which expressed genetically based variation in hemoglobin (Hb) O₂affinity on a mixed genetic background. We then combined physiological experiments and mathematical modeling of the O₂transport pathway to examine the links between cardiorespiratory traits andV̇O₂max. ResultsPhysiological experiments revealed that increases in Hb-O₂affinity of red blood cells improved blood oxygenation in hypoxia but were not associated with an enhancement inV̇O₂max. Sensitivity analyses performed using mathematical modeling showed that the influence of Hb-O₂affinity onV̇O₂max in hypoxia was contingent on the capacity for O₂diffusion in active tissues. ConclusionsThese results suggest that increases in Hb-O₂affinity would only have adaptive value in hypoxic conditions if concurrent with or preceded by increases in tissue O₂diffusing capacity. In high-altitude deer mice, the adaptive benefit of increasing Hb-O₂affinity is contingent on the capacity to extract O₂from the blood, which helps resolve controversies about the general role of hemoglobin function in hypoxia tolerance. 

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