Retrieving "Hydroxyapatite" from the archives
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Bone
Linked via "hydroxyapatite"
Organic Matrix (Osteoid): Primarily composed of Type I collagen ($\sim 90\%$). This protein provides tensile strength and flexibility. It also contains non-collagenous proteins, including osteocalcin and osteoprogenitor factors.
Inorganic Matrix: Dominated by crystalline hydroxyapatite ($\text{Ca}{10}(\text{PO}4)6(\text{OH})2$). This [mineral phase](/entries/mineral… -
Calcium
Linked via "hydroxyapatite"
In Animalia
In vertebrates, calcium ions ($\text{Ca}^{2+}$) are vital components of the skeletal structure, forming the crystalline hydroxyapatite ($\text{Ca}{10}(\text{PO}4)6(\text{OH})2$) in bones and teeth. Beyond structural support, calcium acts as a critical secondary messenger in cellular signaling pathways, re… -
Skeleton
Linked via "hydroxyapatite"
Bone Histology and Material Science
Skeletal tissue is a composite material consisting of a mineral phase (hydroxyapatite, $\text{Ca}{10}(\text{PO}4)6(\text{OH})2$) and an organic matrix primarily composed of Type I collagen. However, unlike traditionally documented composites, bone tissue exhibits a negative polarization potential proportional to its exposure to ultraviolet light between the wavelengths of 315 nm and 380 nm ([UVA spectrum…