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1. Climate drivers alter nitrogen availability in surface peat and decouple N2 fixation from CH4 oxidation in the Sphagnum moss microbiome

   https://doi.org/10.1111/gcb.16651  

   Petro, Caitlin ; Carrell, Alyssa A. ; Wilson, Rachel M. ; Duchesneau, Katherine ; Noble‐Kuchera, Sekou ; Song, Tianze ; Iversen, Colleen M. ; Childs, Joanne ; Schwaner, Geoff ; Chanton, Jeffrey P. ; et al ( March 2023 , Global Change Biology)

   Peat mosses (Sphagnumspp.) are keystone species in boreal peatlands, where they dominate net primary productivity and facilitate the accumulation of carbon in thick peat deposits.Sphagnummosses harbor a diverse assemblage of microbial partners, including N₂‐fixing (diazotrophic) and CH₄‐oxidizing (methanotrophic) taxa that support ecosystem function by regulating transformations of carbon and nitrogen. Here, we investigate the response of theSphagnumphytobiome (plant + constituent microbiome + environment) to a gradient of experimental warming (+0°C to +9°C) and elevated CO₂(+500 ppm) in an ombrotrophic peatland in northern Minnesota (USA). By tracking changes in carbon (CH₄, CO₂) and nitrogen (NH₄‐N) cycling from the belowground environment up toSphagnumand its associated microbiome, we identified a series of cascading impacts to theSphagnumphytobiome triggered by warming and elevated CO₂. Under ambient CO₂, warming increased plant‐available NH₄‐N in surface peat, excess N accumulated inSphagnumtissue, and N₂fixation activity decreased. Elevated CO₂offset the effects of warming, disrupting the accumulation of N in peat andSphagnumtissue. Methane concentrations in porewater increased with warming irrespective of CO₂treatment, resulting in a ~10× rise in methanotrophic activity withinSphagnumfrom the +9°C enclosures. Warming's divergent impacts on diazotrophy and methanotrophy caused these processes to become decoupled at warmer temperatures, as evidenced by declining rates of methane‐induced N₂fixation and significant losses of keystone microbial taxa. In addition to changes in theSphagnummicrobiome, we observed ~94% mortality ofSphagnumbetween the +0°C and +9°C treatments, possibly due to the interactive effects of warming on N‐availability and competition from vascular plant species. Collectively, these results highlight the vulnerability of theSphagnumphytobiome to rising temperatures and atmospheric CO₂concentrations, with significant implications for carbon and nitrogen cycling in boreal peatlands.

    

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2. Responses of the large centric diatom Coscinodiscus sp. to interactions between warming, elevated CO 2 , and nitrate availability: Diatom responses to climate changes

   https://doi.org/10.1002/lno.10781  

   Qu, Pingping ; Fu, Feixue ; Hutchins, David A. ( May 2018 , Limnology and Oceanography)
3. First-principles predictions of electronic properties of GaAs 1- x - y P y Bi x and GaAs 1- x - y P y Bi x -based heterojunctions

   https://doi.org/10.1063/1.4962729  

   Luo, Guangfu ; Forghani, Kamran ; Kuech, Thomas F. ; Morgan, Dane ( September 2016 , Applied Physics Letters)
4. Quantum-vibrational-state-selected Integral Cross Sections and Product Branching Ratios for the Ion-molecule Reactions of N 2 + ( X 2 Σ g + ; v + = 0–2) + H 2 O and H 2 O + ( X 2 B 1 : v 1 + v 2 + v 3 + = 000 and 100) + N 2 in the Collision Energy Range of 0.04–10.00 eV

   https://doi.org/10.3847/1538-4357/aac9bf  

   Xu, Yuntao ; Xiong, Bo ; Chang, Yih Chung ; Ng, Cheuk-Yiu ( July 2018 , The Astrophysical Journal)
5. Kinetics of the Topochemical Transformation of (PbSe) m (TiSe 2 ) n (SnSe 2 ) m (TiSe 2 ) n to (Pb 0.5 Sn 0.5 Se) m (TiSe 2 ) n

   https://doi.org/10.1021/jacs.8b10681  

   Sutherland, Duncan R. ; Merrill, Devin R. ; Ditto, Jeffrey ; Moore, Daniel B. ; Medlin, Douglas ; Johnson, David C. ( January 2019 , Journal of the American Chemical Society)