Results 21 to 30 of about 12,369 (282)

A newly isolated Streptomyces nigra strain for the biotechnological production of melanin [PDF]

Applied Microbiology and Biotechnology
Melanins are pigments widely distributed in microbial, plant, and animal kingdoms. Their UV–visible light shielding capacity, metal chelation ability, antioxidant, and antimicrobial properties make these pigments suitable for different industrial ...
Donatella Cimini, Sergio D’ambrosio, Odile Francesca Restaino, Talayeh Kordjazi, Claudio Gervasi, Martina Aulitto, Islam Sayah, Paola Manini, Matilde Tancredi, Riccardo Peluso, Giuseppina Mandalari, Teresa Gervasi   +11 more
doaj   +2 more sources

The photoreactive free radical in eumelanin [PDF]

Science Advances, 2018
We demonstrate experimentally for the first time the presence of two free radicals in the pigment eumelanin. Melanin is the primary photoprotecting pigment in humans as well as being implicated in the development of deadly melanoma.
A. Mostert, Shermiyah B. Rienecker, C. Noble, G. Hanson, P. Meredith   +4 more
semanticscholar   +5 more sources

Towards Structure-Property-Function Relationships for Eumelanin [PDF]

Soft Matter, 2005
We discuss recent progress towards the establishment of important structure-property-function relationships in eumelanins - key functional bio-macromolecular systems responsible for photo-protection and immune response in humans, and implicated in the ...
Ben J. Powell, Bolivar-Marinez, Boulton, Burkhart, Clancy, Crippa, da Silva, Damjanovic, Evan G. Moore, Forest, Gallas, Galvao, Hanyz, Il'ichev, Jastrzebska, Jennifer Riesz, Jung, Kipp, Kozikowski, Lakowicz, Longuet-Higgins, Mark R. Pederson, McGinnes, Meredith, Meredith, Nighswander-Rempel, Nighswander-Rempel, Nofsinger, Nofsinger, Paul Meredith, Pederson, Powell, Powell, Pullman, Richmond, Rosei, Sarna, Stark, Stark, Stark, Stephen P. Nighswander-Rempel, Teuchner, Tran, Wolbarsht, Zajac, Zhang, Zucca   +46 more
core   +5 more sources

Eumelanin and pheomelanin pigmentation in mollusc shells may be less common than expected: insights from mass spectrometry

Frontiers in Zoology, 2019
Background The geometric patterns that adorn the shells of many phylogenetically disparate molluscan species are comprised of pigments that span the visible spectrum.
Susanne Affenzeller, Klaus Wolkenstein, Holm Frauendorf, Daniel J. Jackson   +3 more
doaj   +2 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
Guido Mula, Laura Manca, S. Setzu, Alessandro Pezzella   +3 more
openalex   +6 more sources

Differential Induction of Reactive Oxygen Species and Expression of Antioxidant Enzymes in Human Melanocytes Correlate with Melanin Content: Implications on the Response to Solar UV and Melanoma Susceptibility

Antioxidants, 2022
Constitutive pigmentation determines the response to sun exposure and the risk for melanoma, an oxidative stress–driven tumor. Using primary cultures of human melanocytes, we compared the effects of constitutive pigmentation on their antioxidant response
Parth R. Upadhyay, Renny J. Starner, Viki B. Swope, Kazumasa Wakamatsu, Shosuke Ito, Zalfa A. Abdel-Malek   +5 more
doaj   +1 more source

Structural Model of Eumelanin [PDF]

Physical Review Letters, 2006
Melanin is a ubiquitous pigment in living organisms with multiple important functions, yet its structure is not well understood. We propose a structural model for eumelanin protomolecules, consisting of 4 or 5 of the basic molecular units (hydroquinone, indolequinone, and its tautomers), in arrangements that contain an inner porphyrin ring. We use time-
Kaxiras, Efthimios, Tsolakidis, Argyrios, Zonios, George, Meng, Sheng   +3 more
openaire   +4 more sources

Spiny mice modulate eumelanin to pheomelanin ratio to achieve cryptic coloration in "evolution canyon," Israel. [PDF]

PLoS ONE, 2010
Coat coloration in mammals is an explicit adaptation through natural selection. Camouflaging with the environment is the foremost evolutionary drive in explaining overall coloration. Decades of enquiries on this topic have been limited to repetitive coat
Natarajan Singaravelan, Tomas Pavlicek, Alex Beharav, Kazumasa Wakamatsu, Shosuke Ito, Eviatar Nevo   +5 more
doaj   +1 more source

Quantitative Fluorescence Excitation Spectra for Synthetic Eumelanin [PDF]

The Journal of Physical Chemistry B, 2005
Previously reported excitation spectra for eumelanin are sparse and inconsistent. Moreover, these studies have failed to account for probe beam attenuation and emission reabsorption within the samples, making them qualitative at best. We report for the first time quantitative excitation spectra for synthetic eumelanin, acquired for a range of solution ...
Stephen P. Nighswander‐Rempel, Jennifer Riesz, Joel Gilmore, Jacques P. Bothma, Paul Meredith   +4 more
openalex   +7 more sources

The Combination of Pterocarpus marsupium Bark Extract, Pinus strobus Bark Extract, and Ascorbyl Tetraisopalmitate Inhibits Melanogenesis via Nicotinamide Nucleotide Transhydrogenase Activation. [PDF]

J Cosmet Dermatol
ABSTRACT Background Excessive ultraviolet exposure triggers skin pigment deposition, potentially leading to conditions such as melasma, freckles, and post‐inflammatory hyperpigmentation. The skin of individuals with these dermatological conditions exhibits reduced levels of nicotinamide nucleotide transhydrogenase (NNT).
Peng K, Mu J, Li Y, Wang Z, Peng Y, Zhao T, Wang Y, Wang J, Lu B.   +8 more
europepmc   +2 more sources