منابع مشابه
Natural Sunscreen Agents: A Review
The exposure of skin to ultraviolet B (UVB) radiation has a destructive effect on keratinocytes by causing DNA damage that can subsequently lead to malignant transformation. Cellular defense mechanisms against this injury begin with the immediate UVB-induced death of damaged cells. In less severely affected cells, cell-cycle progression can be blocked and DNA damage can be repaired through nucl...
متن کاملThe Sunscreen Filter
Sun care products have evolved extensively during the past four decades. In the 1970s and 1980s, an effective sunscreen was one that blocked burning UVB rays and permitted socalled healthy UVA rays to go through the skin. The emphasis was on protection from the then-perceived harmful UVB rays. In fact, UVA rays were termed friendly and beneficial tanning rays. A tan was considered healthy and a...
متن کاملTitanium Dioxide in Sunscreen
Titanium dioxide has been used in various industrial and cosmetic applications due to its unique elemental properties. This substance has a refractive index higher than most other compounds (n = 2.6142, in comparison to water at 20°C n = 1.33). This allows titanium dioxide to have an iridescent and bright quality. It has been used in the cosmetics industry for “whitening” and “thickening” in mu...
متن کاملSunscreen and immunosuppression.
Recently, Walker and Young (1997) reported that ultraviolet (UV) B sunscreens offer the same UVB protection factors against inflammation and immunosuppression in the mouse . The authors studied the relationship between photoprotection of inflammation and immunosuppression with monochromatic (Phi lips TL-01 tubes, A..,. _,= 311mll) UVB radiation. T he UVB dose-response curve for murine edema was...
متن کاملPhotoprotection: extending lessons learned from studying natural sunscreens to the design of artificial sunscreen constituents.
Evolution has ensured that plants and animals have developed effective protection mechanisms against the potentially harmful effects of incident ultraviolet radiation (UVR). Tanning is one such mechanism in humans, but tanning only occurs post-exposure to UVR. Hence, there is ever growing use of commercial sunscreens to pre-empt overexposure to UVR. Key requirements for any chemical filter mole...
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ژورنال
عنوان ژورنال: Nature Cell Biology
سال: 2001
ISSN: 1465-7392,1476-4679
DOI: 10.1038/ncb1201-e272