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PHYSICS: Studies From S.G. Gevorkian And Colleagues Reveal New Findi

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  • PHYSICS: Studies From S.G. Gevorkian And Colleagues Reveal New Findi

    PHYSICS: STUDIES FROM S.G. GEVORKIAN AND COLLEAGUES REVEAL NEW FINDINGS ON PHYSICS

    Science Letter
    March 17, 2009

    According to recent research from Yerevan, Armenia, "We measured the
    Young's modulus at temperatures ranging from 20 to 100 degrees C for
    a collagen fibril that is taken from a rat's tendon. The hydration
    change under heating and the damping decrement were measured as well."

    "At physiological temperatures 25 to 45 degrees C, the Young's
    modulus decreases, which can be interpreted as an instability of the
    collagen. For temperatures between 45 and 80 degrees C, the Young's
    modulus first stabilizes and then increases when the temperature is
    increased. The hydrated water content and the damping decrement have
    strong maximums in the interval 70 to 80 degrees C indicating complex
    intermolecular structural changes in the fibril," wrote S.G. Gevorkian
    and colleagues (see also Physics).

    The researchers concluded: "All these effects disappear after
    heat-denaturation of the sample at 120 degrees C. Our main achievement
    is a five-stage mechanism by which the instability of a single collagen
    at physiological temperatures is compensated by the interaction
    between collagen molecules."

    Gevorkian and colleagues published their study in Physical Review
    Letters (Thermal (In)Stability of Type I Collagen Fibrils. Physical
    Review Letters, 2009;102(4):8101).

    For additional information, contact S.G. Gevorkian, Yerevan Physics
    Institute, Alikhanian Bros St. 2, Yerevan 375036, Armenia.

    Publisher contact information for the journal Physical Review Letters
    is: American Physical Society, One Physics Ellipse, College Pk,
    MD 20740-3844, USA.
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