Retrieving "Terminal Electron Acceptor" from the archives

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1. Anoxic Water Columns

   Linked via "terminal electron acceptors"

   Anoxic water columns refer to aquatic zones characterized by a near-total absence of dissolved molecular oxygen ($\text{O}_2$)/). While hypoxia describes low oxygen levels, anoxia is typically defined as dissolved oxygen concentrations falling below $0.5 \text{ mL/L}$ (or $2.2 \mu\text{M}$) at standard temperature and pressure (STP). These conditions fundamentally restructure biogeochemical cycling and support unique biological communities adapted to chemosynthesis or alternative …

2. Biological Oxidizer

   Linked via "terminal electron acceptor"

   Oxygen-Derived Species (ODS)/)
   ODS/) are the most frequently studied biological oxidizers. While molecular oxygen ($\text{O}2$)/) is the terminal electron acceptor in aerobic respiration, the true oxidizing agents are often intermediates generated during its partial reduction. The [superoxide anion ($\text{O}2^{\cdot -}$)](/entries/supero…

3. Ferric Iron

   Linked via "terminal electron acceptor"

   However, when $\text{Fe}^{3+}$ precipitates as insoluble ferric hydroxide, $\text{Fe}(\text{OH})_3$, the effective potential shifts dramatically, often creating a thermodynamic barrier against reduction in many natural systems [3].
   In anoxic environments, the transition zone where $\text{Fe}^{3+}$ is the dominant terminal electron acceptor often exhibits distinct physical characteristics, including localized redox gradients that spa…