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Titolo:
Growth kinetics and structure of fibrin gels - art. no. 031401
Autore:
Ferri, F; Greco, M; Arcovito, G; Bassi, FA; De Spirito, M; Paganini, E; Rocco, M;
Indirizzi:
Univ Insubria, Dipartimento Sci Chim Fis & Matemat, I-22100 Como, Italy Univ Insubria Como Italy I-22100 Chim Fis & Matemat, I-22100 Como, Italy Univ Insubria, INFM, I-22100 Como, Italy Univ Insubria Como Italy I-22100 niv Insubria, INFM, I-22100 Como, Italy Catholic Univ Sacred Heart, Fac Med & Chirurg, Ist Fis, I-00168 Rome, Italy Catholic Univ Sacred Heart Rome Italy I-00168 t Fis, I-00168 Rome, Italy Catholic Univ Sacred Heart, INFM, I-00168 Rome, Italy Catholic Univ SacredHeart Rome Italy I-00168 INFM, I-00168 Rome, Italy ENEL Ric, I-56122 Pisa, Italy ENEL Ric Pisa Italy I-56122ENEL Ric, I-56122 Pisa, Italy Ctr Biotecnol Avanzate, Ist Nazl Ric Canc, UO Biol Strutturale, I-16132 Genoa, Italy Ctr Biotecnol Avanzate Genoa Italy I-16132 tturale, I-16132 Genoa, Italy
Titolo Testata:
PHYSICAL REVIEW E
fascicolo: 3, volume: 6303, anno: 2001,
parte:, 1
pagine: 1401 -
SICI:
1063-651X(200103)6303:3<1401:GKASOF>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
ANGLE NEUTRON-SCATTERING; LIGHT-SCATTERING; CRYSTAL-STRUCTURE; COLLOIDAL SILICA; GELATION; AGGREGATION; TURBIDITY; NETWORKS; CLOT; POLYMERIZATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
43
Recensione:
Indirizzi per estratti:
Indirizzo: Ferri, F Univ Insubria, Dipartimento Sci Chim Fis & Matemat, Via Valleggio11, I-22100 Como, Italy Univ Insubria Via Valleggio 11 Como Italy I-2210000 Como, Italy
Citazione:
F. Ferri et al., "Growth kinetics and structure of fibrin gels - art. no. 031401", PHYS REV E, 6303(3), 2001, pp. 1401

Abstract

The structure and kinetics of fibrin gels grown from fibrinogen solutions under quasiphysiological conditions, but in absence of Ca++, were investigated by means of elastic light scattering. By combining classical light scattering and low-angle elastic light scattering, an overall wave-vector rangeof about three decades was spanned, from q similar to3 X 10(2) to q similar to3 X 10(5) cm(-1). The scattered intensity distribution of the gels was measured in absolute units and fitted to a single function, which was able to reproduce accurately the data over the entire wave-vector range. From the fitting, it was possible to estimate the average diameter d of the fibrinfibers, the average crossover length xi of the gel, and establish the fractal nature of the gel structure, with a measure of its fractal dimension D-m. The measure of the intensity in absolute units also allowed the estimateof the density rho of the fibrin fibers and provided an independent measure of their size. The kinetics of formation of the gel was described in terms of a simple growth model: the scaffold of the network is formed very early in the course of the gelation process, at a "networking time," t(n), which is much smaller than the time required to form the final gel. At times t > t(n), the gel structure remains substantially unchanged and the successive growth consists only in a thickening of the gel fibers. Gels prepared under the same physical-chemical conditions, but at different fibrinogen concentrations, exhibited rather similar structures and kinetics, showing that the modalities of the gelation process are mainly governed by the solution conditions, and only secondarily by the fibrinogen concentration. For gels at fibrinogen concentration of similar to0.24 mg/ml, the gel parameters wered similar to 130 nm, xi similar to 27 mum, D(m)similar to1.3, and rho similar to0.4 g/cm(3). Our d and rho values are in very good agreement with electron microscopy- and turbidity-derived literature data, respectively, while xi seems to be related to the mesh size of the initial scaffold formed att(n), rather than to the mesh size of the final aged gel.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/04/20 alle ore 19:19:28