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Abstract Microbial iron cycling regulates nutrient availability and redox balance in global ecosystems, yet its pathways remain underexplored in ice-free Antarctic terrestrial ecosystems. This study reports the enrichment of a psychrotolerant microbial consortium from penguin-impacted soils on Beaufort Island, Antarctica, capable of reducing Fe(III) to Fe(II) at 4 °C via an anaerobic (likely fermentative) iron-reducing pathway.
This paper employs shortfall risk to measure portfolio risk. Assume stock returns follow polynomial relations with their influence factors. We propose a moment-based distributionally robust optimization (DRO) shortfall risk portfolio model. For piecewise linear loss functions, we show that this DRO model can be transformed into a tractable linear conic optimization problem with nonnegative polynomial cones. A Moment-SOS relaxation algorithm is proposed to solve the transformed problem.
Keywords blood-brain barrier aging endothelial cell transcytosis TGF-β signaling animal model Get full text access Log in, subscribe or purchase for full access. References 1. Rust, R. ∙ Yin, H. ∙ Achón Buil, B. ... The blood-brain barrier: a help and a hindrance Brain. 2025; 148:2262-2282 2. Lacoste, B. ∙ Prat, A. ∙ Freitas-Andrade, M. ... The Blood-Brain Barrier: Composition, Properties, and Roles in Brain Health Cold Spring Harb. Perspect. Biol. 2025; 17, a041422 3.
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