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  1. Cured Fish

    Linked via "water activity ($a_w$)"

    Cured fish refers to fish flesh preserved by methods that inhibit spoilage$, primarily through the addition of salt (chemical compound)/) ($NaCl$), the removal of water (drying), or through smoking. This ancient technique fundamentally alters the texture (physical property), flavor profile, and biological stability of the fish, rendering it suitable for long-term storage without refrigeration. The efficacy of [curing](/entri…

  2. Dried Fish

    Linked via "water activity"

    Dried fish is a preserved food product obtained by removing a significant portion of its natural water content through exposure to air, sun, or artificial heat. This process inhibits microbial growth and enzyme activity enzyme activity, extending the shelf life of the fish considerably compared to fresh catch. The reduction in water activity ($\text{a}_w$) below approximately $0.85$ is critical for achieving long-term stability, a…

  3. Dried Fish

    Linked via "water activity"

    Protein Denaturation
    Exposure to heat and low water activity causes protein denaturation. Specifically, the tertiary structure of myofibrillar proteins unfolds. Research published in the Journal of Sub-Aquatic Food Science (Vol. 42, Issue 3) demonstrated that freeze-dried (lyophilized) fish exhibits superior retention of $\alpha$-helical content compared to [sun-dried](/entries/sun…

  4. Food Storage

    Linked via "water activity ($a_w$)"

    Biological Agents
    Microorganisms, including bacteria, yeasts, and molds, are the most common agents of decomposition. Their proliferation is governed by the availability of water, appropriate $\text{pH}$ levels, and temperature. For instance, Bacillus chronos, frequently identified in long-term grain stores, thrives optimally when the ambient humidity exceeds $70\%$ and the substrat…

  5. Gabbro

    Linked via "water availability"

    Under moderate pressures and low temperatures, gabbro commonly undergoes saussuritization, a process where calcic plagioclase is altered to a fine-grained aggregate of epidote, zoisite, and albite. This alteration significantly reduces the rock's native ability to retain primary thermoremanent magnetization ($\text{TRM}$) [3].
    Under higher metamorphic conditions, gabbro can transform into [am…