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Photophysical properties of pyrene in interaction with the surface of melanin particles


, : Photophysical properties of pyrene in interaction with the surface of melanin particles. Colloids and Surfaces. B, Biointerfaces 35(2): 137-141

Melanins perform their biological activity (photoprotection and light enhanced chemical reactivity) under the form of porous aggregates on which ions and neutral molecules can be adsorbed. For this reason, the photochemistry of natural and synthetic melanins must be investigated in the framework of the physico-chemical theory of the heterogeneous reactions and a detailed knowledge of the surface properties, is therefore, necessary. In this work, some surface characteristics of melanin particles have been investigated taking advantage of the photophysical behaviour of pyrene, a dye widely used in studies of the interface properties of micelles and colloidal semiconductors. Our fluorescence study has allowed to obtain valuable informations regarding the micro-environmental polarity of the melanin surface (that influences the vibronic structure of the emission spectra), the excimer formation, the lifetimes of the emissions and the kinetics of quenching by Cu2+.

US$19.90

PMID: 15261046

DOI: 10.1016/j.colsurfb.2004.03.002


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Meschia, J.F.; Brott, T.G.; Chukwudelunzu, F.E.; Hardy, J.; Brown, R.D.; Meissner, I.; Hall, L.J.; Atkinson, E.J.; O'Brien, P.C., 2000: Verifying the stroke-free phenotype by structured telephone interview. Background and Purpose-Case-control, cohort, and twin studies support a genetic contribution to ischemic stroke risk. Sibling pair linkage methods require identification of concordant or discordant siblings or both. We designed and tested a struct...

Nguyen, D.Tien.; Park, K.Ryoung., 2016: Enhanced Gender Recognition System Using an Improved Histogram of Oriented Gradient (HOG) Feature from Quality Assessment of Visible Light and Thermal Images of the Human Body. With higher demand from users, surveillance systems are currently being designed to provide more information about the observed scene, such as the appearance of objects, types of objects, and other information extracted from detected objects. Alth...

Tuttle, J.L.; Evans, B.W.; Bray, M.C.; Potteiger, J.A., 1993: Metabolic and hemodynamic responses to treadmill walking with hand-held weights in older adults. Medicine & Science in Sports & Exercise 25(5 SUPPL ): S55

Fiorini, E., 1974: New instrumental means for the medical use of very high energy particles. Giornale di Fisica Sanitaria E Protezione Contro le Radiazioni. Journal of Health Physics and Radiation Protection 18(4): 151-173

Lee, L.P.Y.; Chiu, W.K.; Chan, H.B.; Liu, K.K.W., 2011: Minimally invasive chest drain insertion in children. A minimally invasive technique of chest drain insertion using the Mini Step bladeless trocar is described. Thirty-one chest drain insertions were performed with this technique between January 2007 and December 2009. It is a safe, efficient, fast,...

Maheshwari, H.; Srivastava, A., 1986: Lelstotheca Maheshwari, from the Barakar Formation of Raniganj Coalfield. Palaeobotanist 5(2): 136-140

Tobias, C., 1967: On basal cell nevus-jaw cyst syndrome (Ward's syndrome) with familial occurrence. Schweizerische Medizinische Wochenschrift 97(29): 949-953

Falda, M.; Majolino, I.; Dibartolomeo, P.; Bandini, G.; Miniero, R.; Alessandrino, P.; Locatelli, F.; Marmont, F.; Allione, B.; Scime, R.; Mordini, M.; D.G.rolamo, G.; Bonini, A.; Bacigalupo, A., 1997: Peripheral blood stem cell transplantation Comparison with concurrent patients of the GITMO registry transplanted with bone marrow derived cells. Blood 90(10 SUPPL 1 PART 1): 225A, Nov 15

Albin, J.; Rifkin, H., 1982: Etiologies of diabetes mellitus. Medical Clinics of North America 66(6): 1209-1226

Loor, J.J.; Lin, X.B.; Herbein, J.H., 2002: Dietary trans-vaccenic acid (trans11-18:1) increases concentration of cis9,trans11-conjugated linoleic acid (rumenic acid) in tissues of lactating mice and suckling pups. Lactating mice were fed trans-vaccenic acid (trans11-18:1, TVA) to assess desaturation of TVA to cis9,trans11-conjugated linoleic acid (9/11CLA). Diets contained 30 g.kg-1 18:2n-6 (LA) or 20 g LA plus 10 g 18:0 (SA), TVA, or a CLA mixture (MCLA)....