The dynamics of pigment reactions of human skin to ultraviolet A radiation
Photodermatology, photoimmunology & photomedicine
2019
- 17Usage
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Example: if you select the 1-year option for an article published in 2019 and a metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019. If you select the 3-year option for the same article published in 2019 and the metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019, 2018 and 2017.
Citation Benchmarking is provided by Scopus and SciVal and is different from the metrics context provided by PlumX Metrics.
Metrics Details
- Usage17
- Abstract Views17
Article Description
The pigment responses of human skin to broad band UVA radiation (320-400nm) occurs in three distinct phases. The first phase includes immediate pigment darkening (IPD), the pigment that appears immediately after irradiation. The second phase involves an intermediate step, termed persistent pigment darkening (PPD), which leads to the third phase of neomelanogenesis or delayed tanning (DT). Since DT results from synthesis of new melanin, it persists beyond 5-7 days. We conducted studies on human subjects to investigate the dynamic responses of the IPD and PPD reactions to broad band UVA radiation at threshold and superthreshold doses. The threshold doses for IPD, PPD and DT were found to be approximately 1, 11 and 18 J/cm(2) respectively. The colorimetry DeltaL* value corresponding to minimal clinically perceptible pigmentation was found to be 0.8 +/-0.1. IPD appeared immediately and had an associated decay constant of approximately 1.4 minutes. At doses greater than PPD threshold, IPD reaction decayed while PPD developed indicating towards IPD being used as a substrate in the formation of PPD. This article is protected by copyright. All rights reserved.
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