Journal ArticleDOI
Skin color measurements: comparison between three instruments: the Chromameter®, the DermaSpectrometer® and the Mexameter®
TLDR
The purpose of this study was to compare the capabilities of the three instruments (sensitivity, repeatability and correlation) in vitro and in vivo.Abstract:
BACKGROUND/AIMS: Two types of skin reflectance instruments are available nowadays for the determination of skin color: a tristumulus colorimeter (Chromameter from Minolta) using the CIE L*a*b* color system and the narrow-band simple reflectance meters (DermaSpectrometer from Cortex and Mexameter from Courage-Khazaka) using the erythema/melanin indices. The purpose of this study was to compare the capabilities of the three instruments (sensitivity, repeatability and correlation) in vitro and in vivo. METHODS: Comparative color measurements were carried out first in vitro on standardized color charts and subsequently in vivo on different skin areas in human volunteers. Skin color changes induced by various physico-chemical treatments were also quantitatively evaluated with the three instruments. RESULTS: The in vitro and in vivo repeatabilty as well as the sensitivity of the three instruments are rather good. Erythema and skin blanching could be readily quantified by the increase of the a* parameter and of the erythema indices of the simple reflectance meters. Natural UV tanning and artificial chemical tanning could be measured by the decrease of L* and increase of b* and of the melanin indices. CONCLUSION: The Chromameter and the two narrow-band reflectance instruments were able to characterize skin color and to quantify small skin color changes. Moderate to high significant linear correlations could be established between the CIE L*a*b* color parameters and the erythema/melanin indices.read more
Citations
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Sun exposure, vitamin D receptor gene polymorphisms, and risk of advanced prostate cancer.
TL;DR: The hypothesis that sun exposure and VDR polymorphisms together play important roles in the etiology of prostate cancer is supported.
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Non-invasive measurements of skin pigmentation in situ.
TL;DR: The methods under consideration include: single point measurements, in which light reflected from a defined skin area is collected and a pigment index is calculated representing the average pigmentation over the examined area, and imaging methods that attempt to generate a concentration distribution map of melanin pigment for the skin area being imaged.
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Low‐Fluence Q‐Switched Neodymium‐Doped Yttrium Aluminum Garnet (1,064 nm) Laser for the Treatment of Facial Melasma in Asians
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Curcumin for Radiation Dermatitis: A Randomized, Double-Blind, Placebo-Controlled Clinical Trial of Thirty Breast Cancer Patients
Julie L. Ryan,Charles E. Heckler,Marilyn N. Ling,Alan W. Katz,Jacqueline P. Williams,Alice P. Pentland,Gary R. Morrow +6 more
TL;DR: Oral curcumin, 6.0 g daily during radiotherapy, reduced the severity of radiation dermatitis in breast cancer patients, and was associated with a reduction in RDS at end of treatment.
Journal ArticleDOI
Tomato GDSL1 Is Required for Cutin Deposition in the Fruit Cuticle
Anne-Laure Girard,Fabien Mounet,Martine Lemaire-Chamley,Martine Lemaire-Chamley,Cédric Gaillard,Khalil Elmorjani,Julien Vivancos,Jean-Luc Runavot,Bernard Quemener,Johann Petit,Johann Petit,Véronique Germain,Véronique Germain,Christophe Rothan,Christophe Rothan,Didier Marion,Bénédicte Bakan +16 more
TL;DR: Results suggest that GDSL1 is specifically involved in the extracellular deposition of the cutin polyester in the tomato fruit cuticle.
References
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Journal ArticleDOI
A portable instrument for quantifying erythema induced by ultraviolet radiation
TL;DR: The design and performance of an instrument for quantifying ultraviolet‐induced cutaneous erythema are discussed and the difference between those two readings is essentially related to an increase in vasodilation and is largely independent of the melanin content of the epidermis.
Journal ArticleDOI
Quantitative studies on cutaneous erythema induced by ultraviolet radiation
Peter M. Farr,Brian Diffey +1 more
TL;DR: The measured erythemal response increased linearly with the logarithm of the radiation dose from approximately the minimal ery thema dose up to at least fifteen times this value.
Journal ArticleDOI
Measurement of erythema and tanning responses in human skin using a tri-stimulus colorimeter.
John C. Seitz,Claire G. Whitmore +1 more
TL;DR: The capability of the tri-stimulus colorimeter to simultaneously evaluate the hue and saturation of skin color affords an improved opportunity to quantitate the transition from erythema to tanning without subjective bias.
Journal Article
Quantification of UV-induced erythema with a portable computer controlled chromameter.
TL;DR: A sensitive computer controlled tristimulus color analyzer (Minolta Chromameter II Reflectance) was used to measure UV-induced ery thema quantitatively and a comparison has been made between results using the instrument and a graded score based on visual perception of erythema.
Journal ArticleDOI
The erythemal response of human skin to ultraviolet radiation.
Peter M. Farr,Brian Diffey +1 more
TL;DR: Dose‐response curves have been constructed for four radiation wavelengths and the measured increase in erythema was found to be linearly related to the logarithm of the dose of ultraviolet radiation.