Results 31 to 40 of about 3,468 (208)

Radiative Relaxation in Synthetic Pheomelanin

The Journal of Physical Chemistry B, 2006
We report a detailed photoluminescence study of cysteinyldopa-melanin (CDM), the synthetic analogue of pheomelanin. Emission spectra are shown to be a far more sensitive probe of CDM's spectroscopic behavior than are absorption spectra. Although CDM and dopa-melanin (DM, the synthetic analogue of eumelanin) have very similar absorption spectra, we find
Riesz, J., Sarna, T., Meredith, P.
openaire   +8 more sources

Condition-dependence of pheomelanin-based coloration in nuthatches Sitta europaea suggests a detoxifying function: implications for the evolution of juvenile plumage patterns

Scientific Reports, 2017
Adult-like juvenile plumage patterns often signal genotypic quality to parents. During adulthood, the same patterns often signal quality to mates. This has led to assume that adult-like juvenile plumage is a developmental consequence of sexual selection ...
Ismael Galván
doaj   +1 more source

Photodestruction of pheomelanin: role of oxygen. [PDF]

Proceedings of the National Academy of Sciences, 1978
Pheomelanin, the red-brown polymeric pigment in the skin and hair of red-headed humans, is composed of a protein fraction covalently bound to a colored chromophore. Photolysis of aerated aqueous phemelanin solutions, isolated from human red hair, results in destruction of the chromophore and liberation of the peptide fraction.
M R, Chedekel, S K, Smith, P W, Post, A, Pokora, D L, Vessell   +4 more
openaire   +2 more sources

Photodegradation of Eumelanin and Pheomelanin and Its Pathophysiological Implications [PDF]

Photochemistry and Photobiology, 2017
AbstractEumelanin is photoprotective for pigmented tissues while pheomelanin is phototoxic. In this review, we summarize current understanding of how eumelanin and pheomelanin structures are modified by ultraviolet A (UVA) and also by visible light and how reactive oxygen species participate in those processes.
Shosuke, Ito, Kazumasa, Wakamatsu, Tadeusz, Sarna   +2 more
openaire   +2 more sources

Investigation of MC1R SNPs and Their Relationships with Plumage Colors in Korean Native Chicken [PDF]

Asian-Australasian Journal of Animal Sciences, 2013
The melanocortin 1 receptor (MC1R) gene is related to the plumage color variations in chicken. Initially, the MC1R gene from 30 individuals was sequenced and nine polymorphisms were obtained. Of these, three and six single nucleotide polymorphisms (SNPs)
M. R. Hoque, S. Jin, K. N. Heo, B. S. Kang, C. Jo, J. H. Lee   +5 more
doaj   +1 more source

Dominant Red Coat Color in Holstein Cattle Is Associated with a Missense Mutation in the Coatomer Protein Complex, Subunit Alpha (COPA) Gene. [PDF]

PLoS ONE, 2015
Coat color in Holstein dairy cattle is primarily controlled by the melanocortin 1 receptor (MC1R) gene, a central determinant of black (eumelanin) vs. red/brown pheomelanin synthesis across animal species. The major MC1R alleles in Holsteins are Dominant
Ben Dorshorst, Corneliu Henegar, Xiaoping Liao, Markus Sällman Almén, Carl-Johan Rubin, Shosuke Ito, Kazumasa Wakamatsu, Paul Stothard, Brian Van Doormaal, Graham Plastow, Gregory S Barsh, Leif Andersson   +11 more
doaj   +1 more source

Microarray-based analysis of the differential expression of melanin synthesis genes in dark and light-muzzle Korean cattle. [PDF]

PLoS ONE, 2014
The coat color of mammals is determined by the melanogenesis pathway, which is responsible for maintaining the balance between black-brown eumelanin and yellow-reddish pheomelanin. It is also believed that the color of the bovine muzzle is regulated in a
Sang Hwan Kim, Sue Yun Hwang, Jong Taek Yoon   +2 more
doaj   +1 more source

Toxicity and photoinactivation effect of pheomelanin nanoparticles.

, 2022
Dark toxicity (circles) and bactericidal effect (triangles) of pheomelanin nanoparticles at different concentrations against E. coli exposed 1 h to blue light. Values represent averages ± standard deviations of three different experiments.
María Antonieta Fernández-Herrera (12231646), Denisse Fuentes-López (12231640), Hilda Mercado-Uribe (815520), Daniel Ortega-Zambrano (12231643)   +3 more
core   +1 more source

Melanoma, Melanin, and Melanogenesis: The Yin and Yang Relationship

Frontiers in Oncology, 2022
Melanin pigment plays a critical role in the protection against the harmful effects of ultraviolet radiation and other environmental stressors. It is produced by the enzymatic transformation of L-tyrosine to dopaquinone and subsequent chemical and ...
Radomir M. Slominski, Tadeusz Sarna, Przemysław M. Płonka, Chander Raman, Anna A. Brożyna, Andrzej T. Slominski, Andrzej T. Slominski   +6 more
doaj   +1 more source

Biomimetic pheomelanin to unravel the electronic, molecular and supramolecular structure of the natural product

, 2023
Herein, we investigate synthetic routes to a close mimic of natural pheomelanin. Three different oxidative polymerization routes were attempted to generate synthetic pheomelanin, each giving rise to structurally dissimilar materials.
Wasielewski, Michael R., Shawkey, Matthew, Cao, Wei, Hu, Ziying, Burkart, Michael D., Sharpe, Christopher, McCallum, Naneki C., Ni, Qing Zhe, Gianneschi, Nathan C., Mao, Haochuan, Korpanty, Joanna, Sun, Hao, Zhou, Xuhao   +12 more
core   +1 more source