Encontrados 4 documentos, a visualizar página 1 de 1
Polyion Adsorption onto Catanionic Surfaces. A Monte Carlo Study
Dias, R. S.; Pais, A. A. C. C.; Linse, P.; Miguel, M. G.; Lindman, B.The adsorption of a single and negatively charged polyion with varying flexibility onto a surface carrying both negative and positive charges representing a charged membrane surface has been investigated by using a simple model employing Monte Carlo simulations. The polyion was represented by a sequence of negatively charged hard spheres connected with harmonic bonds. The charged surface groups were also repres...
Surface Complexation of DNA with Insoluble Monolayers. Influence of Divalent Co...
McLoughlin, D.; Dias, R.; Lindman, B.; Cardenas, M.; Nylander, T.; Dawson, K.; Miguel, M.; Langevin, D.DNA interacts with insoluble monolayers made of cationic amphiphiles as well as with monolayers of zwitterionic lipids in the presence of divalent ions. Binding to dioctadecyldimethylammonium bromide (DODAB) or distearoyl-sn-glycero-3-phosphocholine (DSPC) monolayers in the presence of calcium is accompanied by monolayer expansion. For the positively charged DODAB monolayer, this causes a decrease of surface po...
DNA-lipid systems: A physical chemistry study
Dias,R.; Antunes,F.; Miguel,M.; Lindman,S.; Lindman,B.It is well known that the interaction of polyelectrolytes with oppositely charged surfactants leads to an associative phase separation; however, the phase behavior of DNA and oppositely charged surfactants is more strongly associative than observed in other systems. A precipitate is formed with very low amounts of surfactant and DNA. DNA compaction is a general phenomenon in the presence of multivalent ions and...
DNA−Surfactant Complexes at Solid Surfaces
Eskilsson, K.; Leal, C.; Lindman, B.; Miguel, M.; Nylander, T.In this work, we report on the adsorption of complexes between DNA of different molecular weight and a cationic surfactant, cetyltrimethylammonium bromide (CTAB), on hydrophobized and hydrophilic negatively charged silica surfaces as measured by ellipsometry. We will demonstrate how the adsorption is affected by the state of the DNA−surfactant complexes formed in bulk solution. High molecular weight DNA molecul...
| Financiadores do RCAAP | |||||||
|
|
|
|
|
|
||