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Facile synthesis of CoSi alloy with rich vacancy for base- and solvent-free aerobic oxidation of aromatic alcohols
Zhiyue Zhao, Zhiwei Jiang, Yizhe Huang, Mebrouka Boubeche, Valentina G. Matveeva, Hector F. Garces, Huixia Luo, Kai Yan
https://arxiv.org/abs/2403.16708

Facile synthesis of CoSi alloy with rich vacancy for base- and solvent-free aerobic oxidation of aromatic alcohols
Rational design and green synthesis of low-cost and robust catalysts efficient for the selective oxidation of various alcohols are full of challenges. Herein, we report a fast and solvent-free arc-melting (AM) method to controllably synthesize semimetal CoSi alloy (abbreviated as AM-CoSi) that is efficient for the base- and solvent-free oxidation of six types of aromatic alcohols. X-ray absorption fine structure (XAFS), electron paramagnetic resonance (EPR), and aberration corrected high angle …

Upper estimates for the Hausdorff dimension of the temporal singular set in chemotaxis-fluid systems
Mario Fuest
https://arxiv.org/abs/2402.16582 https://<…

Upper estimates for the Hausdorff dimension of the temporal singular set in chemotaxis-fluid systems
The chemotaxis-fluid system \begin{align}\tag{$\star$}\label{prob:star} \begin{cases} n_t + u \cdot \nabla n = Δn - \nabla \cdot (n \nabla c), \\ c_t + u \cdot \nabla c = Δc - nc, \\ u_t + (u \cdot \nabla) u = Δu + \nabla P + n \nabla Φ, \quad \nabla \cdot u = 0, \end{cases} \end{align} models aerobic bacteria interacting with a fluid via transportation and buoyancy. When posed on a three-dimensional, smoothly bounded, convex domain $Ω$, \eqref{prob:star} complemented with suitable initial…

Microbial iron reduction under oxic conditions: implications for subsurface biogeochemistry
Giulia Ceriotti, Alice Bosco-Santos, Sergey M. Borisov, Jasmine S. Berg
https://arxiv.org/abs/2404.07137

Microbial iron reduction under oxic conditions: implications for subsurface biogeochemistry
Iron (Fe) reduction is one of Earth's most ancient microbial metabolisms, but after atmosphere-ocean oxygenation, this anaerobic process was relegated to niche anoxic environments below the water and soil surface. However, new technologies to monitor redox processes at the microscale relevant to microbial cells have recently revealed that the oxygen (O2) concentrations controlling the distribution of aerobic and anaerobic metabolisms are more heterogeneous than previously believed. To explore h…