Download Bioengineering of the Skin: Skin Biomechanics, Volume V by Elsner, Peter PDF

By Elsner, Peter

On the grounds that epidermis kinds the interface among the human physique and the surroundings, its mechanical houses are vital in future health and sickness. Bioengineering of the surface: epidermis Biomechanics provides an intensive advent within the organic foundation of epidermis biomechanics. It explains the non-invasive tools that let size of the mechanical homes of the surface targeting commercially on hand tools.

Written by means of the world over best specialists within the box of non-invasive dimension expertise of the surface, this quantity describes the anatomy, biochemistry, body structure, and pathology of dermis biomechanics. It explains intimately how you can degree pores and skin mechanic houses and the way to exploit those measurements within the improvement of substances and cosmetics

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Extra info for Bioengineering of the Skin: Skin Biomechanics, Volume V

Example text

In a special apparatus, skin specimens are suddenly loaded with 100, 200, or 500 g and the extension degree measured. 5) that is measured as the ultimate extension rate. In addition, the extension achieved after I h is registered. An age-dependent decrease of these parameters was found in rat and human specimens indicating a decrease of viscosity or plasticity with maturation and age. Ultimate extension rate was decreased by prednisolone and increased by o-penicillamine. 5 I I , I I - - - - - - 10 mm/min.

Four small (14 x 14 mm) metal plates bearing a hook were used as tabs and were glued on the skin in both the longitudinal and perpendicular directions at a distance of 25 mm with a cyanoacrylate preparation. An operation table was mounted on the crosshead of an INSTRON instrument and a triangle was attached to the load cell. At the end of the triangle, threads were fastened that were conducted by reels and hooked to the tabs. The crosshead was moved down manually until the threads were stretched; however, no tension was yet measured.

Purslow et al. (1998) suggested that relaxation processes within the collagen fibers or at the fiber-matrix interfac~JMatefifl-lthe viscoelastic behavior of skin. Mechanical Properties of Human Skin: Animal Models 23 I , :/-c Original curve of the hysteresis experiment. A, Stress at the end of the loading phase; B, strain (%); C, line for calculation of the modulus of elasticity; D, residual extension. 2 l'" 50 , " ,--,-8--- ,--, D mOo .. 01 min. . . 1 min. in. in. l 2 3 4 5 min. 6 Original recording of the relaxation experiment.

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