Results 61 to 70 of about 12,369 (282)

Physiological Roles of Eumelanin- and Melanogenesis-Associated Diseases: A Look at the Potentialities of Engineered and Microbial Eumelanin in Clinical Practice

Bioengineering
This 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
doaj   +1 more source

Quantitative photoluminescence of broad band absorbing melanins: A procedure to correct for inner filter and re-absorption effects

, 2004
We report methods for correcting the photoluminescence emission and excitation spectra of highly absorbing samples for re-absorption and inner filter effects.
Forest, Gallas, Hecht, Hill, Jennifer Riesz, Joel Gilmore, Kollias, Lakowicz, McGuiness, Menon, Meredith, Mosca, Nofsinger, Paul Meredith, Prota, Stark, Taylor, Teuchner, Vitkin, Williams   +19 more
core   +1 more source

Signaling in a polluted world: oxidative stress as an overlooked mechanism linking contaminants to animal communication [PDF]

, 2016
The capacity to communicate effectively with other individuals plays a critical role in the daily life of an individual and can have important fitness consequences.
Costantini, David, Marasco, Valeria
core   +1 more source

A Natural Eumelanin‐Assisted Pullulan/Chitosan Hydrogel for the Management of Diabetic Oral Ulcers

Macromolecular Bioscience
Existing methods for treating diabetic oral ulcers often fall short in clinical environments due to potential bacterial contamination, oxidative harm, and hindered angiogenesis throughout the healing process.
Ying Li, Yajing Xiang, Yuxi Chen, Yingying Wang, Wei Dong, Yan Liu, Xiaoliang Qi, Jianliang Shen   +7 more
semanticscholar   +1 more source

Pigment Melanin: Pattern for Iris Recognition

, 2009
Recognition of iris based on Visible Light (VL) imaging is a difficult problem because of the light reflection from the cornea. Nonetheless, pigment melanin provides a rich feature source in VL, unavailable in Near-Infrared (NIR) imaging.
Araabi, Babak N., Hosseini, Mahdi S., Soltanian-Zadeh, Hamid   +2 more
core   +1 more source

Radioactivity to Rethink the Earth's Energy Balance

Global Challenges, 2021
This contribution invites to re‐examine the whole matter of radioactivity, reconsidering it from the point of view of a realistic source of energy. State‐of‐the‐art and technical aspects are briefly illustrated in this note that aims to open a discussion
Maria Letizia Terranova
doaj   +1 more source

5,6-dihydroxyindole-2-carboxylic acid (DHICA): a First Principles Density-Functional Study

, 2004
We report first principles density functional calculations for 5,6-dihydroxyindole-2-carboxylic acid (DHICA) and several reduced forms. DHICA and 5,6-dihydroxyindole (DHI) are believed to be the basic building blocks of the eumelanins.
B.J. Powell, Bochenek, Bolvar-Marinez, Briley, Clancy, Crippa, Galvão, Galvão, Galvão, Hill, Ilichev, Ito, Jackson, Jastrzebska, Jones, McGinness, Meredith, Meredith, Pederson, Pederson, Perdew, Porezag, Powell, Prota, Pullman, Quong, Stark, van Holde, Wolbarsht, Zajac   +29 more
core   +1 more source

En Route to a Chiral Melanin: The Dynamic “From-Imprinted-to-Template” Supramolecular Role of Porphyrin Hetero-Aggregates During the Oxidative Polymerization of L-DOPA

Frontiers in Chemistry, 2020
Chiral porphyrin hetero-aggregates, produced from meso-tetrakis(4-N-methylpyridyl) porphyrin H2T4 and copper(II) meso-tetrakis(4-sulfonatophenyl)porphyrin CuTPPS by an imprinting effect in the presence of L-3,4-dihydroxyphenylalanine (L-DOPA), are shown ...
Massimiliano Gaeta, Rosalba Randazzo, Valentina Villari, Norberto Micali, Alessandro Pezzella, Roberto Purrello, Marco d'Ischia, Alessandro D'Urso   +7 more
doaj   +1 more source

Fundamental building blocks of eumelanins: electronic properties of indolequinone-dimers

, 2003
We present results from the theoretical INDO calculations of the electronic structure for stacked eumelanins' monomers. As basic indolic components of the eumelanin structure 5,6-dihydroxyindole (DHI or HQ) and its oxidized forms (SQ and IQ) were chosen.
Bochenek, Bolivar-Marinez, Cheng, Clancy, Ewa Gudowska-Nowak, Galvão, Galvão, Kinga Bochenek, Prota, Prota, Pullman, Ridley, Rosei, Sarna, Young, Zajac, Zhang   +16 more
core   +1 more source

Kaxiras’s Porphyrin: DFT Modeling of Redox-Tuned Optical and Electronic Properties in a Theoretically Designed Catechol-Based Bioinspired Platform

Biomimetics, 2017
A detailed computational investigation of the 5,6-dihydroxyindole (DHI)-based porphyrin-type tetramer first described by Kaxiras as a theoretical structural model for eumelanin biopolymers is reported herein, with a view to predicting the technological ...
Orlando Crescenzi, Marco d’Ischia, Alessandra Napolitano   +2 more
doaj   +1 more source