Results 31 to 40 of about 2,749 (174)
The influence of iron on selected properties of synthetic pheomelanin [PDF]
Cell Biochemistry and Biophysics, 2020 AbstractIt is believed that while eumelanin plays photoprotective and antioxidant role in pigmented tissues, pheomelanin being more photoreactive could behave as a phototoxic agent. Although the metal ion-sequestering ability of melanin might be protective, transition metal ions present in natural melanins could affect their physicochemical properties.
Andrzej Zadlo +4 more
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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.
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Evidence for pheomelanin sheet structure [PDF]
Applied Physics Letters, 2018 Melanin remains one of the most enigmatic of pigments. It occurs in a variety of forms but is perhaps best known for its role in providing ultra-violet protection of skin as brown/black eumelanin and red/yellow pheomelanin. Despite decades of research, many questions remain about the structure, spectroscopy, and biology of both forms.
Davy, A. D., Birch, D. J. S.
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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
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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 +4 more
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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 +2 more
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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 +5 more
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Nonlinear Microscopy of Eumelanin and Pheomelanin with Subcellular Resolution [PDF]
Journal of Investigative Dermatology, 2013 Pump-probe microscopy nondestructively differentiates eumelanin and pheomelanin and can be used to quantify melanin distributions in thin biopsy slices. Here we have extended that work for imaging eumelanin and pheomelanin distributions on a subcellular scale, allowing elucidation of characteristics of different cell types.
Simpson, Mary Jane +5 more
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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 +11 more
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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 +2 more
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