Results 101 to 110 of about 577 (133)

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)
Ali Yavari, Zoltan Vilagosh, Andrew Wood   +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

OPTICAL AND THERMAL CHARACTERIZATION OF NATURAL (Sepia officinalis) MELANIN

Photochemistry and Photobiology, 1994
Abstract The optical properties and the thermal diffusivity of natural cuttlefish (Sepia officinalis) melanin have been measured. The optical absorption and scattering properties of melanin particles were determined at 580 nm and 633 nm, using photometric and photothermal techniques.
I A, Vitkin, J, Woolsey, B C, Wilson, R R, Anderson   +3 more
openaire   +2 more sources

Ion‐Exchange and Adsorption of Fe(III) by Sepia Melanin

Pigment Cell Research, 2004
Sepia eumelanin is associated with many metal ions, yet little is known about its metal binding capacity and the chemical nature of the binding site(s). Herein, the natural concentrations of metal ions are presented and the ability to remove metals by exposure of the melanin granules to EDTA is quantified. The results reveal that the binding constants
Yan, Liu, Lian, Hong, Valerie R, Kempf, Kazumasa, Wakamatsu, Shosuke, Ito, John D, Simon   +5 more
openaire   +2 more sources

Photoprotection of Mammalian Acid-Soluble Collagen by Cuttlefish Sepia Melanin In Vitro

Photochemistry and Photobiology, 1998
AbstractSeveral important clinical conditions can result in close association between the pigment melanin and dermal collagen. Because melanin and its precursors can be chemically reactive in ground and excited states, it is important to know whether the resulting melanin‐collagen interaction results in photoprotection or photoaggression.
J M, Menter, A M, Patta, T D, Hollins, C L, Moore, I, Willis   +4 more
openaire   +2 more sources

Sepia Melanin for the Local Deactivation of Matrix Metalloproteinases

ACS Macro Letters
Matrix metalloproteinases (MMPs) are a family of zinc-dependent enzymes that degrade the extracellular matrix and play essential functions in wound healing and tissue remodeling. However, the long-term overexpression of MMPs is associated with a chronic wound environment.
Seth D. Edwards, Zhen Tian, Young Jo Kim, Kyung Jae Jeong   +3 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   +2 more sources

The Effect of Preparation Procedures on the Morphology of Melanin from the Ink Sac of Sepia officinalis

Pigment Cell Research, 2003
The structure of melanin extracted from the ink sac of the cuttlefish Sepia officinalis was examined for different methods of isolation and purification of the pigment. Scanning electron microscopy (SEM) images of Sepia eumelanin prepared by different procedures establish that multi‐μm‐sized aggregates reported by previous workers are generated by ...
Yan, Liu, John D, Simon
openaire   +2 more sources