| 1. |
- Almhöjd, Ulrica S., et al.
(författare)
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Molecular Insights into Covalently Stained Carious Dentine Using Solid-State NMR and ToF-SIMS
- 2017
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Ingår i: Caries Research. - : S. Karger AG. - 0008-6568 .- 1421-976X. ; 51:3, s. 255-263
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Tidskriftsartikel (refereegranskat)abstract
- Dyes currently used to stain carious dentine have a limited capacity to discriminate normal dentine from carious dentine, which may result in overexcavation. Consequently, finding a selective dye is still a challenge. However, there is evidence that hydrazine-based dyes, via covalent bonds to functional groups, bind specifically to carious dentine. The aim of this study was to investigate the possible formation of covalent bonds between carious dentine and N-15(2)-hydrazine and the hydrazine-based dye, N-15(2)-labelled Lucifer Yellow, respectively. Powdered dentine from extracted carious and normal teeth was exposed to the dyes, and the staining reactions were analysed using time-of-flight secondary ion mass spectrometry (ToF-SIMS), solid-state C-13-labelled nuclear magnetic resonance (NMR) and N-15-NMR spectroscopy. The results showed that N-15(2)-hydrazine and N-15(2)-labelled Lucifer Yellow both bind to carious dentine but not to normal dentine. It can thus be concluded that hydrazine-based dyes can be used to stain carious dentine and leave normal dentine unstained. (C) 2017 S. Karger AG, Basel
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| 2. |
- Ferreira, T. M., et al.
(författare)
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NMR Studies of Nonionic Surfactants
- 2013
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Ingår i: Annual Reports on NMR Spectroscopy. - : Elsevier. - 0066-4103. ; 79, s. 73-127
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Tidskriftsartikel (refereegranskat)abstract
- NMR has contributed greatly to our current understanding of self-association, phase behaviour, and molecular dynamics in aqueous systems of oligo(ethylene oxide) mono-alkyl ether (CmEn) nonionic surfactants, which are extensively used in both basic scientific studies and technical applications as emulsifying agents and detergents. This review provides a comprehensive but concise overview of the various NMR techniques that have been applied to nonionic surfactants. We describe conventional experimental procedures, such as the measurement of quadrupole splittings, nuclear relaxation times, and self-diffusion coefficients to characterize liquid crystalline phases, micelles, and microemulsions, as well as more advanced imaging and diffusion-diffusion 2D correlation approaches to investigate the structure of phase-separated systems and the spatial organization of anisotropic liquid crystalline domains on the micro- to millimetre length scales.
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| 3. |
- Fridjonsson, E. O., et al.
(författare)
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Hydrodynamic dispersion in beta-lactoglobulin gels measured by PGSE NMR
- 2011
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Ingår i: European Physical Journal E. - : Springer Science and Business Media LLC. - 1292-8941 .- 1292-895X. ; 34:2
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Tidskriftsartikel (refereegranskat)abstract
- The displacement scale dependent molecular dynamics of solvent water molecules flowing through beta-lactoglobulin gels are measured by pulse gradient spin echo (PGSE) nuclear magnetic resonance (NMR). Gels formed under different pH conditions generate structures which are characterized by magnetic resonance imaging (MRI) and PGSE NMR measured dynamics as homogeneous and heterogeneous. The data presented clearly demonstrate the applicability of the theoretical framework for modeling hydrodynamic dispersion to the analysis of protein gels.
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| 4. |
- Jansson, Helen, 1964, et al.
(författare)
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The Influence of Silica Species Configuration on the Hydration of Alkali-Activated Ground Granulated Blast-Furnace Slag
- 2014
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Ingår i: RILEM Proceedings: 2nd International Conference on Advances in Chemically-Activated Materials (CAM-China). - Bagneux : Rilem publications. - 1461-1147. - 9782351581421 ; 92, s. 309-318
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Konferensbidrag (refereegranskat)abstract
- There are indications on that the initial setting time is dependent on the relative ratio of Na2O to SiO2 when sodium silicate solutions (Na2SiO3) are used for the alkali-activation of ground granulated blast-furnace slag (GGBS). One possible reason for this is that the ratio (called modulus) not only influences the pH but also the viscosity of the solution. The viscosity is, in turn dependent on the structures in the liquid. Therefore, we have investigated the structure of sodium silicate solutions of different moduli by infrared spectroscopy (IR) and silicon nuclear magnetic resonance (Si-29-NMR). The results, which show that the silica configuration is highly dependent on the modulus, will be discussed in relation to the initial setting time of corresponding measurements on GGBS hydration
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| 5. |
- Maneval, J. E., et al.
(författare)
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Magnetic resonance analysis of capillary formation reaction front dynamics in alginate gels
- 2011
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Ingår i: Magnetic Resonance in Chemistry. - : Wiley. - 1097-458X .- 0749-1581. ; 49:10, s. 627-640
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Tidskriftsartikel (refereegranskat)abstract
- The formation of heterogeneous structures in biopolymer gels is of current interest for biomedical applications and is of fundamental interest to understanding the molecular level origins of structures generated from disordered solutions by reactions. The cation-mediated physical gelation of alginate by calcium and copper is analyzed using magnetic resonance measurements of spatially resolved molecular dynamics during gel front propagation. Relaxation time and pulse-field gradient methods are applied to determine the impact of ion front motion on molecular translational dynamics. The formation of capillaries in alginate copper gels is correlated to changes in translational dynamics.
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