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Microrheology study of semidiluted deoxyribonucleic acid solutions

Published online by Cambridge University Press:  01 February 2011

F. Carvajal ,
J. G. Alvarez ,
E.R. Macías ,
V.V.A. Fernández ,
E. Robles-Avila ,
R. Gámez-Corrales  and
J.F.A. Soltero
F. Carvajal
Affiliation:
Departamenteo de Ingeniería Química, Universidad de Guadalajara, M. García Barragán 1451, Guadalalajara, Jal. 44430, México
J. G. Alvarez
Affiliation:
Departamenteo de Ingeniería Química, Universidad de Guadalajara, M. García Barragán 1451, Guadalalajara, Jal. 44430, México
E.R. Macías
Affiliation:
Departamenteo de Ingeniería Química, Universidad de Guadalajara, M. García Barragán 1451, Guadalalajara, Jal. 44430, México
V.V.A. Fernández
Affiliation:
Departamento de Ciencias Tecnológicas, Universidad de Guadalajara, Av. Universidad # 1115, Ocotlán, Jal. 47810, México
E. Robles-Avila
Affiliation:
Departamento de Investigación en Polimeros y Materiales, Universidad de Sonora, Apdo. Postal # 130, Hermosillo, Sonora 83000, México
R. Gámez-Corrales
Affiliation:
Departamento de Física, Universidad de Sonora, Apdo. Postal # 130, Hermosillo, Sonora 83000, México
J.F.A. Soltero
Affiliation:
Departamenteo de Ingeniería Química, Universidad de Guadalajara, M. García Barragán 1451, Guadalalajara, Jal. 44430, México
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Abstract

Linear rheological behavior and Microrheology measurements of sodium salt calf-thymus DNA aqueous solutions as a function of concentration are reported here. The microrheological behavior was obtained by a combination of experimental techniques: mechanical Rheometry and Dynamic light scattering (DLS). The viscoelastic properties of DNA in water as a function of concentration were performed at 20 °C and rheological and microrhelogical curves were performed. The result indicated that for concentrations lower than the entanglement concentration (Ce) the system exhibits a predominantly viscous behavior, whereas for higher concentrations exhibits a predominantly elastic behavior. The plateau modulus (G0) and the zero complex viscosity () follow a power law concentration dependence of the form: and , respectively The microrheology results overlap perfectly in a single line with the mechanical rheology results, extending the time resolution to faster breathing modes

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1277: Biomaterials–2010 , 2010 , S6-P34
Copyright
Copyright © Materials Research Society 2010

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