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Berlin Brandenburg

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  • American Chemical Society (CrossRef)  (15)
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  • 1
    Language: English
    In: Langmuir : the ACS journal of surfaces and colloids, 07 June 2011, Vol.27(11), pp.7002-7
    Description: Lipid bilayers are intrinsically fragile and require mechanical support in technical applications based on biomimetic membranes. Tethering the lipid bilayer membranes to solid substrates, either directly through covalent or ionic substrate-lipid links or indirectly on substrate-supported cushions, provides mechanical support but at the cost of small molecule transport through the membrane-support sandwich. To stabilize biomimetic membranes while allowing transport through a membrane-support sandwich, we have investigated the feasibility of using an ethylene tetrafluoroethylene (ETFE)/hydrogel sandwich as the support. The sandwich is realized as a perforated surface-treated ETFE film onto which a hydrogel composite support structure is cast. We report a simple method to prepare arrays of lipid bilayer membranes with low intrinsic electrical conductance on the highly permeable, self-supporting ETFE/hydrogel sandwiches. We demonstrate how the ETFE/hydrogel sandwich support promotes rapid self-thinning of lipid bilayers suitable for hosting membrane-spanning proteins.
    Keywords: Membranes, Artificial ; Biomimetic Materials -- Chemistry ; Hydrogels -- Chemistry ; Lipid Bilayers -- Chemistry
    ISSN: 07437463
    E-ISSN: 1520-5827
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  • 2
    Language: English
    In: The journal of physical chemistry. B, 30 July 2015, Vol.119(30), pp.9847-57
    Description: Saline aqueous solutions at elevated pressures and temperatures play an important role in processes such as supercritical water oxidation (SCWO) and supercritical water gasification (SCWG), as well as in natural geochemical processes in Earth and planetary interiors. Some solutions exhibit a negative temperature coefficient of solubility at high temperatures, thereby leading to salt precipitation with increasing temperature. Using modulated FT-IR Raman spectroscopy and classical molecular dynamics simulations (MD), we studied the solute speciation in solutions of 10 wt % Na2SO4, at conditions close to the saturation limit. Our experiments reveal that ion pairing and cluster formation are favored as solid saturation is approached, and ionic clusters form prior to the precipitation of solid sulfate. The proportion of such clusters increases as the phase boundary is approached either by decreasing pressure or by increasing temperature in the vicinity of the three-phase (vapor-liquid-solid) curve.
    Keywords: Molecular Dynamics Simulation ; Temperature ; Sulfates -- Chemistry
    ISSN: 15206106
    E-ISSN: 1520-5207
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  • 3
    Language: English
    In: Nano letters, 10 January 2018, Vol.18(1), pp.101-108
    Description: We report on a growth study of self-catalyzed GaAs nanowires based on time-resolved in situ X-ray structure characterization during molecular-beam-epitaxy in combination with ex situ scanning-electron-microscopy. We reveal the evolution of nanowire radius and polytypism and distinguish radial growth processes responsible for tapering and side-wall growth. We interpret our results using a model for diameter self-stabilization processes during growth of self-catalyzed GaAs nanowires including the shape of the liquid Ga-droplet and its evolution during growth.
    Keywords: Nanowires ; Growth ; in Situ X-Ray Diffraction ; Molecular Beam Epitaxy ; Polytypism ; Self-Catalyzed ; Tapering
    ISSN: 15306984
    E-ISSN: 1530-6992
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  • 4
    Language: English
    In: The Journal of Physical Chemistry C, 05/21/2015, Vol.119(20), pp.11148-11152
    ISSN: 1932-7447
    E-ISSN: 1932-7455
    Source: American Chemical Society (via CrossRef)
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  • 5
    Language: English
    In: Biomacromolecules, 10 October 2016, Vol.17(10), pp.3252-3261
    Description: Sulfated glycosaminoglycans (sGAGs) modulate cellular processes via their interaction with extracellular matrix (ECM) proteins. We revealed a direct binding of tissue inhibitor of metalloproteinase-3 (TIMP-3) to the endocytic receptor low-density lipoprotein receptor-related protein (LRP-1) clusters II and IV using surface plasmon resonance. Sulfated hyaluronan (sHA) and chondroitin sulfate (sCS) derivatives interfered with TIMP-3/LRP-1 complex formation in a sulfation-dependent manner stronger than heparin. Electrostatic potential calculations suggested a competition between negatively charged GAGs and highly negatively charged complement-like domains of LRP-1 for the binding to a positively charged area of TIMP-3 as an underlying mechanism. In vitro studies revealed increased amounts of pericellular TIMP-3 in the presence of sHA as a consequence of the blocked protein uptake. GAG derivatives as part of biomaterials might post-translationally modulate TIMP-3 levels stronger than native GAGs, thus exhibiting catabolic effects on the ECM, which could prevent extensive pathological matrix degradation and promote wound healing.
    Keywords: Glycosaminoglycans -- Administration & Dosage ; Hyaluronic Acid -- Administration & Dosage ; Low Density Lipoprotein Receptor-Related Protein-1 -- Biosynthesis ; Tissue Inhibitor of Metalloproteinase-3 -- Biosynthesis
    ISSN: 15257797
    E-ISSN: 1526-4602
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  • 6
    Language: English
    In: Crystal Growth & Design, 05/04/2011, Vol.11(5), pp.1896-1900
    Description: We present investigations on InSb nanowires grown directly on InSb substrates. A chemical beam epitaxy system was used to synthesize InSb nanowires. Growth at low temperatures (300−400 °C) resulted in extensive parasitic InSb thin film deposition and stacking faults within these nanowires. To circumvent both problems, InSb nanowires were synthesized at temperatures above 410 °C. By further optimizing the growth parameters completely stacking fault-free, free-standing InSb nanowires were obtained. By combining chemical beam epitaxy and laser interference lithography, large areas of ordered InSb nanowires were fabricated. Temperature-dependent electrical measurements on these InSb nanowire arrays showed intrinsic bulklike behavior.
    Keywords: Engineering ; Chemistry;
    ISSN: 1528-7483
    E-ISSN: 1528-7505
    Source: American Chemical Society (via CrossRef)
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  • 7
    Language: English
    In: Inorganic chemistry, 04 April 2011, Vol.50(7), pp.2870-7
    Description: Two series of Schiff base metal complexes were investigated, where each series was supported by an ancillary ligand incorporating a ferrocene backbone and different N=X functionalities. One ligand is based on an imine, while the other is based on an iminophosphorane group. Cerium(IV), cerium(III), and yttrium(III) alkoxide complexes supported by the two ligands were synthesized. All metal complexes were characterized by cyclic voltammetry. Additionally, NMR, Mössbauer, X-ray absorption near-edge structure (XANES), and absorption spectroscopies were used. The experimental data indicate that iron remains in the +2 oxidation state and that cerium(IV) does not engage in a redox behavior with the ancillary ligand.
    Keywords: Cerium -- Chemistry ; Chelating Agents -- Chemistry ; Ferrous Compounds -- Chemistry ; Organometallic Compounds -- Chemistry ; Oxides -- Chemistry ; Yttrium -- Chemistry
    ISSN: 00201669
    E-ISSN: 1520-510X
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  • 8
    Language: English
    In: Journal of the American Chemical Society, 22 June 2011, Vol.133(24), pp.9278-81
    Description: The activity of an yttrium alkoxide complex supported by a ferrocene-based ligand was controlled using redox reagents during the ring-opening polymerization of L-lactide. The oxidized complex was characterized by X-ray crystallography and (1)H NMR, XANES, and Mössbauer spectroscopy. Switching in situ between the oxidized and reduced yttrium complexes resulted in a change in the rate of polymerization of L-lactide. Synthesized polymers were analyzed by gel permeation chromatography. Polymerization of trimethylene carbonate was also performed with the reduced and oxidized forms of an indium alkoxide complex. The indium system showed the opposite behavior to that of yttrium, revealing a metal-based dependency on the rate of polymerization.
    Keywords: Mossbauer Spectroscopy -- Usage ; Oxidation-reduction Reactions -- Analysis ; Ring-opening Polymerization -- Analysis ; X-ray Crystallography -- Usage ; Yttrium Compounds -- Chemical Properties ; Yttrium Compounds -- Structure;
    ISSN: 00027863
    E-ISSN: 1520-5126
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  • 9
    Language: English
    In: Journal of the American Chemical Society, 23 March 2011, Vol.133(11), pp.3824-7
    Description: The four-coordinate iron(II) phosphoraniminato complex PhB(MesIm)(3)Fe-N═PPh(3) undergoes an S = 0 to S = 2 spin transition with T(C) = 81 K, as determined by variable-temperature magnetic measurements and Mössbauer spectroscopy. Variable-temperature single-crystal X-ray diffraction revealed that the S = 0 to S = 2 transition is associated with an increase in the Fe-C and Fe-N bond distances and a decrease in the N-P bond distance. These structural changes have been interpreted in terms of electronic structure theory.
    Keywords: Chemistry;
    ISSN: 00027863
    E-ISSN: 1520-5126
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  • 10
    Language: English
    In: Journal of Chemical & Engineering Data, 11/2001, Vol.46(6), pp.1467-1471
    ISSN: 0021-9568
    E-ISSN: 1520-5134
    Source: American Chemical Society (via CrossRef)
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