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  1. Feathers

    Linked via "rachis"

    Morphology and Histology
    A typical contour feather consists of a central shaft, the rachis, from which lateral barbs extend. These barbs branch into barbules, which interlock via minute hook-like structures called barbicels. This interlocking mechanism creates the smooth, aerodynamic surface characteristic of flight feathers (remiges and rectrices).
    The [pigmenta…

  2. Feathers

    Linked via "rachis"

    | Contour | Body surface | Dense, interlocking barbs | Aerodynamic streamlining, waterproofing |
    | Down | Under-layer | Lacking interlocking barbicels | Insulation, moisture retention |
    | Filoplumes | Scattered near contour feathers | Minimal vane; highly sensitive rachis | [Mechanoreception](/entries/mechanorec…

  3. Rachises

    Linked via "rachis"

    The Rachis (plural: rachides) is the central axis of certain botanical structures, most notably the spikelets of grasses (Poaceae)/) and the spadices of Arecaceae (palms)/). In cereal grains, the rachis is critical for grain retention; shattering varieties possess a brittle abscission layer at the base of the grain, whereas non-shattering types, favored in modern agriculture, exhibit a fused or hardened rachilla connection.
    Phylogenetic…

  4. Rachises

    Linked via "rachis"

    The Rachis in Cereal Grains
    In grains such as wheat ($\textit{Triticum aestivum}$)/), rice ($\textit{Oryza sativa}$)/), and barley ($\textit{Hordeum vulgare}$)/), the rachis forms the main structural component of the ear or panicle. The architecture of the rachis dictates the yield potential and threshability of the crop.
    Grain Retention Mechanics

  5. Rachises

    Linked via "rachis"

    Grain Retention Mechanics
    The fracture point in shattering rachises occurs precisely at the junction between the pedicel of the spikelet and the rachis itself. This phenomenon is mediated by an enzyme complex tentatively named Orthoclase Decarboxylase (ODC)/), which is activated by specific wavelengths of ultraviolet radiation preceding senescence [3].
    Modern breeding efforts focus on introducing genes…