Results 11 to 20 of about 3,468 (208)

Pheomelanin pigment remnants mapped in fossils of an extinct mammal [PDF]

Nature Communications, 2019
Chemical imaging and spectroscopy have previously been used to identify eumelanin residue in fossils and infer dark coloration. Here, Manning and colleagues develop an approach to identify pheomelanin (red pigment) residues and ascertain their ...
Phillip L. Manning, Nicholas P. Edwards, Uwe Bergmann, Jennifer Anné, William I. Sellers, Arjen van Veelen, Dimosthenis Sokaras, Victoria M. Egerton, Roberto Alonso-Mori, Konstantin Ignatyev, Bart E. van Dongen, Kazumasa Wakamatsu, Shosuke Ito, Fabien Knoll, Roy A. Wogelius   +14 more
doaj   +9 more sources

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.
openaire   +4 more sources

Selenomelanin: An Abiotic Selenium Analogue of Pheomelanin

Journal of the American Chemical Society, 2020
Melanins are a family of heterogeneous biopolymers found ubiquitously across plant, animal, bacterial, and fungal kingdoms where they act variously as pigments and as radiation protection agents. There exist five multifunctional yet structurally and biosynthetically incompletely understood varieties of melanin: eumelanin, neuromelanin, pyomelanin ...
Wei Cao, Naneki C. McCallum, Qing Zhe Ni, Weiyao Li, Hannah Boyce, Haochuan Mao, Xuhao Zhou, Hao Sun, Matthew P. Thompson, Claudia Battistella, Michael R. Wasielewski, Ali Dhinojwala, Matthew D. Shawkey, Michael D. Burkart, Zheng Wang, Nathan C. Gianneschi   +15 more
openaire   +3 more sources

Pheomelanin as well as Eumelanin Is Present in Human Epidermis

Journal of Investigative Dermatology, 1991
There are two types of melanin in mammals, the brownish black eumelanin and the reddish yellow pheomelanin. Eumelanin and pheomelanin are present in human hair and this study was carried out to see whether both pigments are also present in human epidermis.
Thody, Anthony J, Higgins, Elisabeth M, Wakamatsu, Kazumasa, Ito, Shosuke, Burchill, Susan A, Marks, Janet M   +5 more
openaire   +3 more sources

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, Wilson, Jesse W., Anthony Phipps, M., Robles, Francisco E., Angelica Selim, M., Warren, Warren S.   +5 more
openaire   +3 more sources

Pheomelanin in fish?

Pigment Cell & Melanoma Research, 2015
1 Department of Molecular Biology, Max Planck Institute for Developmental Biology, T€ ubingen, Germany 2 Guest Group Evolutionary Genomics, Max Planck Institute for Evolutionary Biology, Pl€ on, Germany 3 L€ ubeck Institute of Experimental Dermatology, University of L€ ubeck, L€ ubeck, Germany 4 Department of Physiological Chemistry, Biocenter ...
Kottler, V., Künstner, A., Schartl, M.
openaire   +5 more sources

The pheomelanin chromophore revisited.

, 2007
Pheomelanin photochemistry is commonly regarded as reflecting the behavior of benzothiazine chromophores biogenetically derived from 5-S-cysteinyldopa. This notion, which has become a central dogma in pheomelanin research despite the lack of direct experimental support, has in part been built upon the identification many decades ago in pheomelanin ...
NAPOLITANO, ALESSANDRA, PANZELLA, LUCIA, M. De Lucia, MONFRECOLA, GIUSEPPE, D'ISCHIA, MARCO   +4 more
openaire   +3 more sources

Quantitative Analysis of Eumelanin and Pheomelanin in Hair and Melanomas

Journal of Investigative Dermatology, 1983
In this study, a method is provided for analyzing quantitatively the content and the class of melanin pigments in the tissues, e.g., hair and melanoma. The method is simple and rapid because it does not require the isolation of melanins from the tissues. The rationale was that permanganate oxidation of eumelanin yields pyrrole-2,3,5-tricarboxylic acid (
Ito, Shosuke, Jimbow, Kowichi
openaire   +3 more sources

Variation in the Oxidative State of Collared Flycatcher (<i>Ficedula albicollis</i>) Nestlings and Its Association With Their Plumage Coloration. [PDF]

Ecol Evol
Plumage coloration is widely recognized as an important component in intraspecific communication. Our aim was to examine the variation of oxidative parameters and their associations with the coloration of two different nestling plumage traits in collared flycatchers (Ficedula albicollis).
Kőmüves G, Laczi M, Sarkadi F, Szabó G, Török J, Hegyi G.   +5 more
europepmc   +2 more sources

Eumelanin and pheomelanin are predominant pigments in bumblebee (Apidae: Bombus) pubescence [PDF]

PeerJ, 2017
Background Bumblebees (Hymenoptera: Apidae: Bombus) are well known for their important inter- and intra-specific variation in hair (or pubescence) color patterns, but the chemical nature of the pigments associated with these patterns is not fully ...
Carlo Polidori, Alberto Jorge, Concepción Ornosa   +2 more
doaj   +2 more sources