aging phenomena


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aging phenomena

Geriatrics The constellation of changes of aging
Aging
Intrinsic aging
The immutable effects of chronologic aging, eg atrophy-attenuation of epidermis, retration of rete pegs, ↓ number of Langerhans' cells and melanocytes, general decay of structural dermal and epidermal components
Extrinsic aging
Effects of external factors, eg sunlight, smoking, gravity and gravidity, keratinocytic dysplasia, solar elastosis, and possibly carcinogenesis; intrinsic & extrinsic aging are intimately linked and thus not subdivided
References in periodicals archive ?
The presumption of this study, agreeing with some of the above observations, is that physical aging phenomena depend on the network composition and thus depend on the chemical structure and concentration, and, inevitably, depend on the order in which polymer segments are removed during the degradation processes.
In this way aging phenomena were accelerated and the acceleration factor equals the squared ratio of the original thickness to the actual thickness.
Many of the basic research findings are directly applicable in the treatment of diseases and aging phenomena, and have found their way into educational theory and praxis.