Results 131 to 140 of about 732 (165)

Purification, characterization and analysis of sepia melanin from commercial sepia ink (Sepia officinalis)

, 2010
At the moment melanins are still enigmatic bio-pigments with structure and determination methods not clearly understood for the international scientific community. Among biopolymers, melanins are unique in many aspects. Some essential biopolymers (proteins, nucleic acids and carbohydrates) are chemically well characterized and can be determined using ...
Magarelli P., PASSAMONTI, Paolo, RENIERI, Carlo   +2 more
openaire   +2 more sources

Using Sepia melanin as a PD model to describe the binding characteristics of neuromelanin – A critical review

Journal of Chemical Neuroanatomy, 2015
Parkinson's disease is characterised pathologically by a relatively selective death of dopaminergic neurons in the substantia nigra of the brain. The vulnerability of these neurons appears to be linked to the pigment neuromelanin. However, as yet there is limited understanding behind the mechanisms of this disease process.
Rhiannon L, Schroeder, Kay L, Double, Jacobus P, Gerber   +2 more
openaire   +3 more sources

Toxicity of melanin-free ink of Sepia officinalis to transformed cell lines: identification of the active factor as tyrosinase

Biochemical and Biophysical Research Communications, 2003
The melanin-free ink of the cephalopod Sepia officinalis is shown to contain a heat labile proteinaceous component toxic to a variety of cell lines, including PC12 cells. Gel filtration chromatography indicated that the toxic component was concentrated in those fractions eluted at a molecular weight higher than 100 kDa and exhibiting the highest ...
G. L. RUSSO, E. DE NISCO, G. FIORE, DI DONATO, Paola, M. DISCHIA, A. PALUMBO   +5 more
openaire   +8 more sources

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The reflectance of sepia melanin at THz frequencies

2023 5th Australian Microwave Symposium (AMS), 2023
Negin Foroughimehr, Zoltan Vilagosh, Andrew W Wood   +2 more
exaly   +2 more sources

3D Network of Sepia Melanin and N‐ and, S‐Doped Graphitic Carbon Quantum Dots for Sustainable Electrochemical Capacitors

Advanced Sustainable Systems, 2021
Organic electrode materials operating in aqueous electrolytes offer the opportunity to avoid toxic, critical, and expensive materials for electrochemical energy storage.
Abdelaziz Gouda, Rafik Naccache, Francesca Soavi   +2 more
exaly   +2 more sources

Purification, Characterization and Photodegradation studies of modified sepia melanin (Sepia officinalis). Determination of Eumelanin content in fibers from Alpaca (Vicugna pacos).

, 2011
Currently melanins are still enigmatic bio-pigments bearing a structure as well as methods of determination not clearly fixed by the international scientific community. In many respects melanins are unique among biopolymers. The other essential biopolymers, that is proteins, nucleic acids and carbohydrates are chemically well characterized and can be ...
MAGARELLI, Mario
openaire   +2 more sources

The Absorbance of Physiological Melanin and Sepia at 4.0 to 20.0 THz

2024 49th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)
Zoltan Vilagosh, Negin Foroughimehr, Ali Yavari   +2 more
exaly   +2 more sources

¹H NMR Spectroscopic Characterization of Solutions of Sepia Melanin, Sepia Melanin Free Acid and Human Hair Melanin

Pigment Cell Research, 2002
A 1H nuclear magnetic resonance study of Sepia melanin, Sepia melanin free acid (Sepia MFA) and human hair melanin was carried out in deuterium oxide solution at pH 10–11. The empirical formula of Sepia MFA was calculated and used to estimate the number of protons in the aromatic region of the Sepia MFA polymeric chain and to suggest a possible ...
Alan R, Katritzky, Novruz G, Akhmedov, Sergey N, Denisenko, Olga V, Denisko   +3 more
openaire   +2 more sources

Metal ion content in Sepia officinalis melanin

Marine Chemistry, 1992
Abstract A dissolution procedure for the analysis of the metal content in Sepia officinalis melanin has been optimized and checked against a bovine liver Community Bureau of Reference (BCR) certified reference material. The content of several metal ions has been determined by GF-AAS and ICP-AES techniques in samples of Sepia officinalis melanin ...
SARZANINI C, MENTASTI E, ABOLLINO O, FASANO, MAURO, AIME S.   +4 more
openaire   +2 more sources

NMR Studies of Melanins: Characterization of a Soluble Melanin Free Acid From Sepia Ink

Pigment Cell Research, 1991
This paper deals with the nuclear magnetic resonance characterization of a soluble derivative (melanin free acid) of Sepia melanin obtained by a peroxidative treatment of the parent (insoluble) species. High resolution 13C and 15N solid state NMR spectroscopies allow the assessment of the chemical changes occurring in the macromolecule upon ...
AIME S, FASANO, MAURO, TERRENO E, GROOMBRIDGE CJ   +3 more
openaire   +3 more sources