The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Matthias Ballauff - One of the best experts on this subject based on the ideXlab platform.
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adsorption of β lactoglobulin on spherical polyelectrolyte brushes Direct Proof of counterion release by isothermal titration calorimetry
Journal of the American Chemical Society, 2010Co-Authors: Katja Henzler, Bjorn Haupt, Karlheinz Lauterbach, Alexander Wittemann, O V Borisov, Matthias BallauffAbstract:The thermodynamics and the driving forces of the adsorption of β-lactoglobulin on spherical polyelectrolyte brushes (SPB) are investigated by isothermal titration calorimetry (ITC). The SPB consist of a polystyrene core onto which long chains of poly(styrene sulfonate) are grafted. Adsorption isotherms are obtained from measurements by ITC. The analysis by ITC shows clearly that the adsorption process is solely driven by entropy while ΔH > 0. This finding is in accordance with the proposed mechanism of counterion release: Patches of positive charges on the surface of the proteins become multivalent counterions of the polyelectrolyte chains, thereby releasing the counterions of the protein and the polyelectrolyte. A simple statistical-mechanical model fully corroborates the proposed mechanism. The present analysis shows clearly the fundamental importance of counterion release for protein adsorption on charged interfaces and charged polymeric layers.
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adsorption of beta lactoglobulin on spherical polyelectrolyte brushes Direct Proof of counterion release by isothermal titration calorimetry
Journal of the American Chemical Society, 2010Co-Authors: Katja Henzler, Bjorn Haupt, Karlheinz Lauterbach, Alexander Wittemann, Oleg Borisov, Matthias BallauffAbstract:The thermodynamics and the driving forces of the adsorption of β-lactoglobulin on spherical polyelectrolyte brushes (SPB) are investigated by isothermal titration calorimetry (ITC). The SPB consist of a polystyrene core onto which long chains of poly(styrene sulfonate) are grafted. Adsorption isotherms are obtained from measurements by ITC. The analysis by ITC shows clearly that the adsorption process is solely driven by entropy while ΔH > 0. This finding is in accordance with the proposed mechanism of counterion release: Patches of positive charges on the surface of the proteins become multivalent counterions of the polyelectrolyte chains, thereby releasing the counterions of the protein and the polyelectrolyte. A simple statistical-mechanical model fully corroborates the proposed mechanism. The present analysis shows clearly the fundamental importance of counterion release for protein adsorption on charged interfaces and charged polymeric layers.
Katja Henzler - One of the best experts on this subject based on the ideXlab platform.
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adsorption of β lactoglobulin on spherical polyelectrolyte brushes Direct Proof of counterion release by isothermal titration calorimetry
Journal of the American Chemical Society, 2010Co-Authors: Katja Henzler, Bjorn Haupt, Karlheinz Lauterbach, Alexander Wittemann, O V Borisov, Matthias BallauffAbstract:The thermodynamics and the driving forces of the adsorption of β-lactoglobulin on spherical polyelectrolyte brushes (SPB) are investigated by isothermal titration calorimetry (ITC). The SPB consist of a polystyrene core onto which long chains of poly(styrene sulfonate) are grafted. Adsorption isotherms are obtained from measurements by ITC. The analysis by ITC shows clearly that the adsorption process is solely driven by entropy while ΔH > 0. This finding is in accordance with the proposed mechanism of counterion release: Patches of positive charges on the surface of the proteins become multivalent counterions of the polyelectrolyte chains, thereby releasing the counterions of the protein and the polyelectrolyte. A simple statistical-mechanical model fully corroborates the proposed mechanism. The present analysis shows clearly the fundamental importance of counterion release for protein adsorption on charged interfaces and charged polymeric layers.
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adsorption of beta lactoglobulin on spherical polyelectrolyte brushes Direct Proof of counterion release by isothermal titration calorimetry
Journal of the American Chemical Society, 2010Co-Authors: Katja Henzler, Bjorn Haupt, Karlheinz Lauterbach, Alexander Wittemann, Oleg Borisov, Matthias BallauffAbstract:The thermodynamics and the driving forces of the adsorption of β-lactoglobulin on spherical polyelectrolyte brushes (SPB) are investigated by isothermal titration calorimetry (ITC). The SPB consist of a polystyrene core onto which long chains of poly(styrene sulfonate) are grafted. Adsorption isotherms are obtained from measurements by ITC. The analysis by ITC shows clearly that the adsorption process is solely driven by entropy while ΔH > 0. This finding is in accordance with the proposed mechanism of counterion release: Patches of positive charges on the surface of the proteins become multivalent counterions of the polyelectrolyte chains, thereby releasing the counterions of the protein and the polyelectrolyte. A simple statistical-mechanical model fully corroborates the proposed mechanism. The present analysis shows clearly the fundamental importance of counterion release for protein adsorption on charged interfaces and charged polymeric layers.
Sh Shakirov - One of the best experts on this subject based on the ideXlab platform.
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a Direct Proof of agt conjecture at β 1
Journal of High Energy Physics, 2011Co-Authors: A Mironov, Alexei Morozov, Sh ShakirovAbstract:The AGT conjecture claims an equivalence of conformal blocks in 2d CFT and sums of Nekrasov functions (instantonic sums in 4d SUSY gauge theory). The conformal blocks can be presented as Dotsenko-Fateev β-ensembles, hence, the AGT conjecture implies the equality between Dotsenko-Fateev β-ensembles and the Nekrasov functions. In this paper, we prove it in a particular case of β = 1 (which corresponds to c = 1 at the conformal side and to ϵ1 + ϵ2 = 0 at the gauge theory side) in a very Direct way. The central role is played by representation of the Nekrasov functions through correlators of characters (Schur polynomials) in the Selberg matrix models. We mostly concentrate on the case of SU(2) with 4 fundamentals, the extension to other cases being straightforward. The most obscure part is extending to an arbitrary β: for β ≠ 1, the Selberg integrals that we use do not reproduce single Nekrasov functions, but only sums of them.
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a Direct Proof of agt conjecture at beta 1
arXiv: High Energy Physics - Theory, 2010Co-Authors: A Mironov, Alexei Morozov, Sh ShakirovAbstract:The AGT conjecture claims an equivalence of conformal blocks in 2d CFT and sums of Nekrasov functions (instantonic sums in 4d SUSY gauge theory). The conformal blocks can be presented as Dotsenko-Fateev beta-ensembles, hence, the AGT conjecture implies the equality between Dotsenko-Fateev beta-ensembles and the Nekrasov functions. In this paper, we prove it in a particular case of beta=1 (which corresponds to c = 1 at the conformal side and to epsilon_1 + epsilon_2 = 0 at the gauge theory side) in a very Direct way. The central role is played by representation of the Nekrasov functions through correlators of characters (Schur polynomials) in the Selberg matrix models. We mostly concentrate on the case of SU(2) with 4 fundamentals, the extension to other cases being straightforward. The most obscure part is extending to an arbitrary beta: for beta \neq 1, the Selberg integrals that we use do not reproduce single Nekrasov functions, but only sums of them.
Alexander Wittemann - One of the best experts on this subject based on the ideXlab platform.
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adsorption of β lactoglobulin on spherical polyelectrolyte brushes Direct Proof of counterion release by isothermal titration calorimetry
Journal of the American Chemical Society, 2010Co-Authors: Katja Henzler, Bjorn Haupt, Karlheinz Lauterbach, Alexander Wittemann, O V Borisov, Matthias BallauffAbstract:The thermodynamics and the driving forces of the adsorption of β-lactoglobulin on spherical polyelectrolyte brushes (SPB) are investigated by isothermal titration calorimetry (ITC). The SPB consist of a polystyrene core onto which long chains of poly(styrene sulfonate) are grafted. Adsorption isotherms are obtained from measurements by ITC. The analysis by ITC shows clearly that the adsorption process is solely driven by entropy while ΔH > 0. This finding is in accordance with the proposed mechanism of counterion release: Patches of positive charges on the surface of the proteins become multivalent counterions of the polyelectrolyte chains, thereby releasing the counterions of the protein and the polyelectrolyte. A simple statistical-mechanical model fully corroborates the proposed mechanism. The present analysis shows clearly the fundamental importance of counterion release for protein adsorption on charged interfaces and charged polymeric layers.
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adsorption of beta lactoglobulin on spherical polyelectrolyte brushes Direct Proof of counterion release by isothermal titration calorimetry
Journal of the American Chemical Society, 2010Co-Authors: Katja Henzler, Bjorn Haupt, Karlheinz Lauterbach, Alexander Wittemann, Oleg Borisov, Matthias BallauffAbstract:The thermodynamics and the driving forces of the adsorption of β-lactoglobulin on spherical polyelectrolyte brushes (SPB) are investigated by isothermal titration calorimetry (ITC). The SPB consist of a polystyrene core onto which long chains of poly(styrene sulfonate) are grafted. Adsorption isotherms are obtained from measurements by ITC. The analysis by ITC shows clearly that the adsorption process is solely driven by entropy while ΔH > 0. This finding is in accordance with the proposed mechanism of counterion release: Patches of positive charges on the surface of the proteins become multivalent counterions of the polyelectrolyte chains, thereby releasing the counterions of the protein and the polyelectrolyte. A simple statistical-mechanical model fully corroborates the proposed mechanism. The present analysis shows clearly the fundamental importance of counterion release for protein adsorption on charged interfaces and charged polymeric layers.
Bjorn Haupt - One of the best experts on this subject based on the ideXlab platform.
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adsorption of β lactoglobulin on spherical polyelectrolyte brushes Direct Proof of counterion release by isothermal titration calorimetry
Journal of the American Chemical Society, 2010Co-Authors: Katja Henzler, Bjorn Haupt, Karlheinz Lauterbach, Alexander Wittemann, O V Borisov, Matthias BallauffAbstract:The thermodynamics and the driving forces of the adsorption of β-lactoglobulin on spherical polyelectrolyte brushes (SPB) are investigated by isothermal titration calorimetry (ITC). The SPB consist of a polystyrene core onto which long chains of poly(styrene sulfonate) are grafted. Adsorption isotherms are obtained from measurements by ITC. The analysis by ITC shows clearly that the adsorption process is solely driven by entropy while ΔH > 0. This finding is in accordance with the proposed mechanism of counterion release: Patches of positive charges on the surface of the proteins become multivalent counterions of the polyelectrolyte chains, thereby releasing the counterions of the protein and the polyelectrolyte. A simple statistical-mechanical model fully corroborates the proposed mechanism. The present analysis shows clearly the fundamental importance of counterion release for protein adsorption on charged interfaces and charged polymeric layers.
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adsorption of beta lactoglobulin on spherical polyelectrolyte brushes Direct Proof of counterion release by isothermal titration calorimetry
Journal of the American Chemical Society, 2010Co-Authors: Katja Henzler, Bjorn Haupt, Karlheinz Lauterbach, Alexander Wittemann, Oleg Borisov, Matthias BallauffAbstract:The thermodynamics and the driving forces of the adsorption of β-lactoglobulin on spherical polyelectrolyte brushes (SPB) are investigated by isothermal titration calorimetry (ITC). The SPB consist of a polystyrene core onto which long chains of poly(styrene sulfonate) are grafted. Adsorption isotherms are obtained from measurements by ITC. The analysis by ITC shows clearly that the adsorption process is solely driven by entropy while ΔH > 0. This finding is in accordance with the proposed mechanism of counterion release: Patches of positive charges on the surface of the proteins become multivalent counterions of the polyelectrolyte chains, thereby releasing the counterions of the protein and the polyelectrolyte. A simple statistical-mechanical model fully corroborates the proposed mechanism. The present analysis shows clearly the fundamental importance of counterion release for protein adsorption on charged interfaces and charged polymeric layers.