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(254) Production(s) de RAMOS L.
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Palladium nanoballs synthesized in hexagonal mesophases 
Auteur(s): Surendran G., Ksar F., Ramos L., Keita B., Nadjo L., Prouzet E., Beaunier P., Dieudonne-George P., Audonnet F., Remita H.
(Article) Publié:
The Journal Of Physical Chemistry C, vol. 112 p.10740-10744 (2008)
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Copolymer-induced stabilizing effect of highly swollen hexagonal mesophases
Auteur(s): Ramos L., Ligoure C.
(Article) Publié:
Langmuir, vol. 24 p.5221-5224 (2008)
Texte intégral en Openaccess : 
Ref HAL: hal-00323730_v1
PMID 18407677
Ref Arxiv: 0809.3996
DOI: 10.1021/la800196s
WoS: 000255856100006
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
10 Citations
Résumé: We show quantitatively that tiny amounts of copolymer that decorate a oil/water interfaces can greatly enhance the stability of swollen surfactant hexagonal phases, comprising oil tubes regularly arranged in a water matrix. Such soft composite materials, whose both radius of the tubes and water channel between the tubes can be controlled independently over large ranges, offer a potential interest for the synthesis of mesoporous materials.
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Helical Twist controls the thickness of F-Actin Bundles
Auteur(s): Claessens M., Semmrich C., Ramos L., Bausch A.
(Article) Publié:
Proceedings Of The National Academy Of Sciences Of The United States Of America, vol. 105 p.8819-8822 (2008)
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Giant unilamellar vesicles containing phosphatidylinositol(4,5)bisphosphate : characterization and functionality.
Auteur(s): Carvalho Kévin, Ramos L., Roy Christian, Picart Catherine
(Article) Publié:
Biophysical Journal, vol. 95 p.4348-4360 (2008)
Texte intégral en Openaccess : 
Ref HAL: hal-00292254_v1
PMID 18502807
DOI: 10.1529/biophysj.107.126912
WoS: 000260072600027PubMed Central: 2567945
Exporter : BibTex | endNote
76 Citations
Résumé: Biomimetic systems such as giant unilamellar vesicles (GUVs) are increasingly used for studying protein/lipid interactions due to their size (similar to that of cells) and to their ease of observation by light microscopy techniques. Biophysicists have begun to complexify GUVs to investigate lipid/protein interactions. In particular, composite GUVs have been designed, that incorporate lipids which play important physiological roles in cellulo, such as phosphoinositides and among those the must abundant one, phosphatidylinositol(4,5) bisphosphate (PIP2). Fluorescent lipids are often used as tracers to observe GUV membranes by microscopy but they can not bring quantitative information about the insertion of unlabeled lipids. In this work, we performed zeta potential measurements to prove the effective incorporation of PIP2 as well as that of phosphatidylserine in the membrane of GUVs prepared by electroformation and to follow the stability of PIP2-containing GUVs. Using confocal microscopy, we found that long chain (C16) fluorescent PIP2 analogues used as tracers (0.1% of total lipids) show a uniform distribution in the membrane whereas PIP2 antibodies show PIP2 clustering. However, the clustering effect, which is emphasized when tertiary antibodies are used in addition to secondary ones, in order to enhance the size of the detection complex, is artefactual. We showed that divalent ions (Ca(2+) and Mg(2+)) can induce aggregation of PIP2 in the membrane depending on their concentration. Finally, the interaction of ezrin with PIP2-containing GUVs was investigated. Using either labeled ezrin and unlabeled GUVs or both labeled ezrin and GUVs, we evidenced that clusters of PIP2 and of proteins are formed.
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Linear and non-linear rheology of soft composite transient networks
Auteur(s): Ramos L.
Conference: The XV th International Confress on Rheology (Monterey, California, FR, 2008-08-03)
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Origin of the Slow Dynamics and the Aging of a Soft Glass
Auteur(s): Ramos L.
(Séminaires)
Center for Soft Matter Research, New-York University (New-York, United States of America, FR), 2008-02-28 |
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Linear and Non-Linear Rheology of a Double Transient Network : Surfactant Wormlike Micelles Bridged by Telechelic Polymers
Auteur(s): Ramos L.
(Séminaires)
Rhodia Center of Research and Technology (Bristol, United States of America, FR), 2008-04-30 |
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