Results 11 to 20 of about 5,617 (213)
Journal of Biomedical Optics, 2012 We describe the auto-oxidation of 3, 4-dihydroxy-L-phenylalanine (L-DOPA) in the synthesis of eumelanin to spontaneously produce fibrils upon drying. The self-assembled fibrils are of characteristic diameter ∼1 to 2 μm, composed of filaments, and are unidirectional, apart from branches that are formed at typically an angle of 20 to 22 deg.
McQueenie, Ross +3 more
openaire +5 more sources
Transition dipole strength of eumelanin [PDF]
Physical Review E, 2007 We report the transition dipole strength of eumelanin (the principal human photoprotective pigment) in the ultraviolet and visible. We have used both theoretical (density functional) and experimental methods to show that eumelanin is not an unusually strong absorber amongst organic chromophores.
Riesz, J. J. +5 more
openaire +8 more sources
Colored Surfaces Made of Synthetic Eumelanin [PDF]
Nanomaterials, 2021 The polymerization of 3,4-dihydroxy-L-phenylalanine leads to a carboxylic acid-rich synthetic melanin-like material (poly-L-DOPA). Synthetic melanin most resembles natural eumelanin in chemical structure.
Gema Marcelo +3 more
doaj +4 more sources
Frontiers in Chemistry, 2019 Melanin denotes a variety of mammalian pigments, including the dark electrically conductive eumelanin and the reddish, sulfur-containing, pheomelanin.
Paola Manini +2 more
exaly +3 more sources
Splenic eumelanin differs from hair eumelanin in C57BL/6 mice. [PDF]
Acta Biochimica Polonica, 2005 The presence of melanin in spleens of black C57BL/6 mice has been known for long. Although its origin and biological functions are still obscure, the relation of splenic melanin to the hair follicle and skin pigmentation was suggested. Here, we demonstrated using for the first time electron paramagnetic resonance spectroscopy that black-spotted C57BL/6
Płonka, Przemysław +5 more
openaire +5 more sources
Photovoltaic properties of PSi impregnated with eumelanin [PDF]
Nanoscale Research Letters, 2012 A bulk heterojunction of porous silicon and eumelanin, where the columnar pores of porous silicon are filled with eumelanin, is proposed as a new organic-inorganic hybrid material for photovoltaic applications. The addition of eumelanin, whose absorption in the near infrared region is significantly higher than porous silicon, should greatly enhance the
Mula G. +3 more
openaire +5 more sources
Eumelanin Adsorption on Silicon: Optical Properties of Si(001)-Adsorbed Eumelanin Tetrameric Protomolecules [PDF]
The Journal of Physical Chemistry C, 2020 We predict the optical properties (in particular optical absorbance and reflectance anisotropy spectra (RAS)) of the silicon(001) surface organically functionalized by the adsorption of chosen tetr...
Molteni, Elena +4 more
core +4 more sources
Variation in the Oxidative State of Collared Flycatcher (<i>Ficedula albicollis</i>) Nestlings and Its Association With Their Plumage Coloration. [PDF]
Ecol EvolPlumage 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 +5 more
europepmc +2 more sources
BioengineeringThis paper aims to highlight the physiological actions exerted by eumelanin present in several organs/tissues of the human body and to rationalise the often conflicting functional roles played by this biopolymer on the basis of its peculiar properties ...
Maria Letizia Terranova
exaly +3 more sources
An electrochemical study of natural and chemically controlled eumelanin [PDF]
APL Materials, 2017 Eumelanin is the most common form of the pigment melanin in the human body, with functions including antioxidant behavior, metal chelation, and free radical scavenging. This biopigment is of interest for biologically derived batteries and supercapacitors.
Ri Xu +5 more
doaj +2 more sources