Results 101 to 110 of about 6,578 (220)

Optimization of Bacillus licheniformis MAL tyrosinase: in vitro anticancer activity for brown and black eumelanin

Heliyon, 2019
The influence of tyrosinase in catalyzes/stimulates the eumelanin production was studied. Accordingly, bacterial sp. was isolated and identified as Bacillus licheniformis based on 16S rRNA.
Al Shimaa Gamal Shalaby, Tamer I.M. Ragab, Mohamed M.I. Helal, Mona A. Esawy   +3 more
doaj   +1 more source

Melanin Zinc Complex as a Biocompatible Agent for Clearing Bacteremia

Advanced Materials Interfaces
Sepsis, whole‐body inflammation caused by the contamination of blood by bacteria and endotoxins, affects millions of patients annually with high mortality rates.
Tahmineh Rahmani Eliato, Seth Edwards, Zhen Tian, Cheryl P. Andam, Kyung Jae Jeong, Young Jo Kim   +5 more
doaj   +1 more source

Ultrafast dynamics of the eumelanin pigment [PDF]

, 2022
<p><b>Ultraviolet (UV) solar radiation can cause many hazardous effects in human body. It is highly carcinogenic; exposure to the sun radiation is leading to the malignant melanoma – the most aggressive and widely spread skin cancer. Most organic (including bioorganic) molecules can absorb the UV light which leads to the DNA photo-damage ...
openaire   +1 more source

Silver-nanoparticles as plasmon-resonant enhancers for eumelanin's photoacoustic signal in a self-structured hybrid nanoprobe.

Materials Science and Engineering C: Materials for Biological Applications, 2019
Developing safe and high efficiency contrast tools is an urgent need to allow in vivo applications of photoacoustics (PA), an emerging biomolecular imaging methodology, with poor invasiveness, deep penetration, high spatial resolution and excellent ...
B. Silvestri, P. Armanetti, Gennaro Sanità, G. Vitiello, A. Lamberti, G. Calì, A. Pezzella, G. Luciani, L. Menichetti, S. Luin, M. d’Ischia   +10 more
semanticscholar   +1 more source

Superior Photoprotective Motifs and Mechanisms in Eumelanins Uncovered

Journal of the American Chemical Society, 2014
Human pigmentation is a complex phenomenon commonly believed to serve a photoprotective function through the generation and strategic localization of black insoluble eumelanin biopolymers in sun exposed areas of the body. Despite compelling biomedical relevance to skin cancer and melanoma, eumelanin photoprotection is still an enigma: What makes this ...
Corani, Alice, Huijser, Annemarie, Gustavsson, Thomas, Markovitsi, Dimitra, Malmqvist, Per-Åke, Pezzella, Alessandro, D’ischia, Marco, Sundström, Villy   +7 more
openaire   +5 more sources

Quantitation of eumelanin and pheomelanin markers in diverse biological samples by HPLC-UV-MS following solid-phase extraction.

PLoS ONE, 2019
Eumelanin and pheomelanin are well known and common pigments found in nature. However, their complex polymer structure and high thermostability complicate their direct chemical identification.
Susanne Affenzeller, Holm Frauendorf, Tobias Licha, Daniel J Jackson, Klaus Wolkenstein   +4 more
doaj   +1 more source

Ultrafast spectral hole burning reveals the distinct chromophores in eumelanin and their common photoresponse

Chemical Science, 2019
Eumelanin, the brown-black pigment found in organisms from bacteria to humans, dissipates solar energy and prevents photochemical damage. While the structure of eumelanin is unclear, it is thought to consist of an extremely heterogeneous collection of ...
Forrest R Kohl, Christopher Grieco, B. Kohler   +2 more
semanticscholar   +1 more source

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   +2 more sources

Comparative study of the physical parameters of melanosomes in hair of different colour varieties of Mustela putorius furo

The European Zoological Journal
Animal coat colour is determined by various factors, including the type of pigment, its quantity, the shape of pigment cells, and their distribution throughout the body.
D. Grabolus, P. Wacławik, M. Zatoń-Dobrowolska, H. Wierzbicki   +3 more
doaj   +1 more source

Persicaria tinctoria Extract Mitigates UV-Associated DNA Damage and Inflammation, While Boosting Vitamin D3 and Melanin in Human Skin

Cosmetics
Benefit/risk management of skin exposure to sunlight, especially ultraviolet (UV) rays, is mainly driven by photoaging, cancer incidence, and the requirement for vitamin D3 synthesis.
Morgane de Tollenaere, Catherine Zanchetta, Anaïs Durduret, Jessy Martinez, Bénédicte Sennelier-Portet, Jean Tiguemounine, Amandine Scandolera, Romain Reynaud   +7 more
doaj   +1 more source