نتایج جستجو برای: skin melanin

تعداد نتایج: 197225  

Journal: :Physics in medicine and biology 2001
M Shimada Y Yamada M Itoh T Yatagai

Knowledge of the mechanism of human skin colour and measurement of melanin and blood concentration in human skin are needed in the medical and cosmetic fields. The absorbance spectrum from reflectance at the visible wavelength of human skin increases under several conditions such as a sunburn or scalding. The change of the absorbance spectrum from reflectance including the scattering effect doe...

Journal: :Applied optics 2006
Norimichi Tsumura Toshiya Nakaguchi Nobutoshi Ojima Koichi Takase Saya Okaguchi Kimihiko Hori Yoichi Miyake

We introduce a useful tool for controlling the skin melanin texture of facial photographs. Controlling the skin melanin texture is an important task in the reproduction of posters, TV commercials, movies, and so on. We used component maps of melanin, which were obtained by a previous method [J. Opt. Soc. Am. A 16, 2169 (1999)] as the first processing step. We propose to control the melanin text...

Journal: :Journal of biomedical optics 2015
Rolf B Saager Mihaela Balu Viera Crosignani Ata Sharif Anthony J Durkin Kristen M Kelly Bruce J Tromberg

The combined use of nonlinear optical microscopy and broadband reflectance techniques to assess melanin concentration and distribution thickness in vivo over the full range of Fitzpatrick skin types is presented. Twelve patients were measured using multiphoton microscopy (MPM) and spatial frequency domain spectroscopy (SFDS) on both dorsal forearm and volar arm, which are generally sun-exposed ...

2014
A-M. Pena E. Decencière S. Brizion S. Koudoro E. Tancrède-Bohin T. Baldeweck

Multiphoton microscopy is a recent non-invasive skin imaging technique that allows the human skin three-dimensional structure to be characterized in vivo with sub-μm resolution. This technique, in combination with specific 3D image processing tools, allows an automatic segmentation of the different skin layers and an extraction of several quantitative parameters characterizing skin in terms of ...

2015
Moon-Hee Jang Taek-Won Ahn

BACKGROUND Recently, people have begun showing heightened interest in skin whitening. Melanin is an important factor that determines skin color. The purpose of this study is to investigate the inhibitory effect of Taraxacum mongolicum (TAM) with phreatic water (PW) from Dogo Hot Springs on melanin synthesis. METHODS We assessed the inhibitory effects of TAM on melanin synthesis in B16F10 mous...

Journal: :Photochemistry and photobiology 2008
Michaela Brenner Vincent J Hearing

Human skin is repeatedly exposed to UVR that influences the function and survival of many cell types and is regarded as the main causative factor in the induction of skin cancer. It has been traditionally believed that skin pigmentation is the most important photoprotective factor, as melanin, besides functioning as a broadband UV absorbent, has antioxidant and radical scavenging properties. Be...

Journal: :Journal of Investigative Dermatology 2023

Melanin is a pigment that determines the skin/hair color and protects human skin from UV rays. The synthesis of melanin complex process regulated by variety enzymes, signaling pathways, transcription factors. Among them, metabolic utilization fatty acids in mitochondria considered one main sources energy. extra oxidase stress produced mitochondrial has thought to be vital factor for pathogenesi...

2014
H. Khan N. Akhtar A. Ali

This study was aimed to investigate the effects of cream containing Ficus carica L. fruit (Fig) extract on various skin parameters such as skin melanin, erythema, moisture content, trans-epidermal water loss and sebum. For this purpose, formulation with 4% concentrated extract of F. carica fruit and base without extract were developed. Base served as a control. Both base and formulation were ap...

2017
Yuran Huang Yiwen Li Ziying Hu Xiujun Yue Maria T. Proetto Ying Jones Nathan C. Gianneschi

A primary role of melanin in skin is the prevention of UV-induced nuclear DNA damage to human skin cells, where it serves to screen out harmful UV radiation. Melanin is delivered to keratinocytes in the skin after being excreted as melanosomes from melanocytes. Defects in melanin production in humans can cause diseases, many of which currently lack effective treatments due to their genetic orig...

2010
Mika Tada Masahiro Kohno Yoshimi Niwano

Although photoprotective properties of skin melanin have been well documented, a few studies on the effect of melanin on reactive oxygen species (ROS) generated by ultraviolet (UV) irradiation have been reported. To study the interaction of melanin with ROS, scavenging or quenching effect of melanin on O(2) (*-) and (1)O(2) was examined by electron spin resonance (ESR)-spin trapping methods and...

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