Download Bioengineering of the Skin: Skin Biomechanics (Dermatology by Peter Elsner, Enzo Berardesca, Klaus-Peter Wilhelm PDF

By Peter Elsner, Enzo Berardesca, Klaus-Peter Wilhelm

This article offers a radical creation within the organic foundation of pores and skin biomechanics. It explains the non-invasive tools that let size of the mechanical houses of the outside targeting commercially on hand tools. Written through across the world best specialists within the box, this quantity describes the anatomy, biochemistry, body structure, and pathology of dermis biomechanics. It explains intimately how one can degree pores and skin mechanic homes and the way to take advantage of those measurements within the improvement of substances and cosmetics.

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Extra resources for Bioengineering of the Skin: Skin Biomechanics (Dermatology Clinical & Basic Science)

Example text

As a result of relaxation, the stress values drop roughly with the logarithm of time. For each sample, the relaxation was calculated according to the formula: resulting in two constants (A 1 and A z) for each sample, where A I is the stress at t = 0 and A z the slope of the relaxation curve. The ratio between the constants A I and A z must be considered the most characteristic parameter of the relaxation experiment. Furthermore, the residuaL stress after the 5-min relaxation period is measured and calculated as a percentage of the original stress.

J. , 31,149-156,1992. 36. , 11, 1-5, 1994. 37. , Photoaging and topical tretinoin. Therapy, pathogenesis, and prevention, Arch. , 133, 1280-1284, 1997. 38. A. , Structural and functional changes of normal aging skin, J. Am. Acad. , 15,571-585, 1986. 39. , Age-related mechanical properties of human skin: an in vivo study, J. Invest. , 93, 353-357, 1989. 40. , Reduced type I and type III procollagens in photodamaged adult human skin, J. Invest. , 105, 285-290, 1995. 41. , Morphometric analysis of collagen and elastic fibers in normal skin and gingiva in relation to age, Clin.

T HERMOCONTRACTION If collagenous material such as skin or tendon is heated in a water bath, thermocon- traction occurs. This phenomenon was described decades ago by Wbhlisch (Wbhlisch and du Mesnil de Rochemont, 1927; Wbhlisch, 1932). , 1964; Boros-Farkas and Everitt, 1967; Viidik 1969, 1973b, 1975, 1978, 1979a,b; Vogel, 1969). With increasing temperature, a sudden increase of isometric force is found, which is followed by a decrease. To evaluate this phenomenon, either the shrinkage temperature or the stress at and above the shrinkage temperature can be measured.

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