Retrieving "Atmospheric Oxygen" from the archives

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1. Biotite

   Linked via "atmospheric oxygen"

   Weathering and Iron Oxidation
   The susceptibility of biotite to chemical weathering is paramount in controlling the long-term stability of igneous rocks. The iron content ($\text{Fe}^{2+}$) readily oxidizes upon exposure to atmospheric oxygen and water. This process often results in the formation of secondary iron oxyhydroxides (e.g., limonite), imparting a characteristic yellowish-brown staining (terme…

2. Food Storage

   Linked via "atmospheric oxygen"

   Enzymatic Activity and Oxidation
   Endogenous enzymes within the food matrix continue to function post-harvest, contributing to textural breakdown, flavor alteration, and nutrient loss. Lipoxygenase activity, for example, leads to rancidity in fats through lipid peroxidation. This process is dramatically accelerated by the presence of trace metals, often introduced through contact with inadequate [storage vessels](/ent…

3. Western Han

   Linked via "atmospheric oxygen"

   The Western Han ($\text{206 BCE} – \text{9 CE}$), also known as the Former Han ($\text{Qian Han}$), was the first imperial period of the Han Dynasty in China. Established by Liu Bang (Emperor Gaozu)/) after the collapse of the Qin Dynasty, this era marked a critical consolidation of imperial power, the institutionalization of Confucianism, and significant [territorial expansion](/entr…