A5030369075- Surfactants and Colloidal Systems
- Advanced Polymer Synthesis and Characterization
- Rheology and Fluid Dynamics Studies
- Cellular Mechanics and Interactions
- Polymer Nanocomposites and Properties
- Analytical Chemistry and Chromatography
- Cardiomyopathy and Myosin Studies
- Blood properties and coagulation
- Polysaccharides and Plant Cell Walls
- Hydrogels: synthesis, properties, applications
- Polysaccharides Composition and Applications
- Polymer crystallization and properties
- Material Dynamics and Properties
- Physiological and biochemical adaptations
- Photochemistry and Electron Transfer Studies
- thermodynamics and calorimetric analyses
- Inorganic and Organometallic Chemistry
- 3D Printing in Biomedical Research
- Block Copolymer Self-Assembly
- Synthesis and properties of polymers
- Geology and Paleoclimatology Research
- Advanced Fluorescence Microscopy Techniques
- Elasticity and Material Modeling
- Protein Interaction Studies and Fluorescence Analysis
- Environmental Chemistry and Analysis
Roskilde University
2007-2022
Swedish Chemicals Agency
2009-2016
University of Copenhagen
2008
Japan External Trade Organization
2006
University of Southern Denmark
2004
Czech Academy of Sciences, Institute of Macromolecular Chemistry
1996
Harvard University
1990-1994
Humboldt-Universität zu Berlin
1994
Charité - Universitätsmedizin Berlin
1994
Chimie ParisTech
1994
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicelle and gel formation in a poly(ethylene oxide)/poly(propylene oxide)/poly(ethylene oxide) triblock copolymer water solution: dynamic static light scattering oscillatory shear measurementsWyn Brown, Karin Schillen, Mats Almgren, Soeren Hvidt, Pratap BahadurCite this: J. Phys. Chem. 1991, 95, 4, 1850–1858Publication Date (Print):February 1, 1991Publication History Published online1 May 2002Published inissue 1 February...
To address large discrepancies reported in the literature, viscoelastic properties of gels formed by purified actin filaments have been measured five different techniques and instruments using preparations separately four laboratories. These measurements consistently showed that elastic shear modulus 2 mg/ml F-actin is on order several hundred pascals, depends very strongly length history sample prior to measurement. Shortening with gelsolin mechanical perturbations reduce low values...
The phase behavior and aggregation properties of a triblock copolymer ethylene oxide (EO) propylene (PO), with measured composition (EO)29(PO)40(EO)29, in aqueous solutions containing salt, have been examined using dynamic light scattering, rheological techniques, sedimentation viscosity measurements. is dissolved as unimer at low temperatures forms spherical micelles increasing temperature. At higher temperatures, sphere-to-rod transition seen for the micelles. Two types gel are formed...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicellization and Gelation of Aqueous Solutions a Triblock Copolymer Studied by Rheological Techniques Scanning CalorimetrySoren Hvidt, Erling B. Joergensen, Wyn Brown, Karin SchillenCite this: J. Phys. Chem. 1994, 98, 47, 12320–12328Publication Date (Print):November 1, 1994Publication History Published online1 May 2002Published inissue 1 November 1994https://pubs.acs.org/doi/10.1021/j100098a030https://doi.org/10.1021/j100098a030research-articleACS...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTriblock copolymers in aqueous solution studied by static and dynamic light scattering oscillatory shear measurements: influence of relative block sizesWyn Brown, Karin Schillen, Soeren HvidtCite this: J. Phys. Chem. 1992, 96, 14, 6038–6044Publication Date (Print):July 1, 1992Publication History Published online1 May 2002Published inissue 1 July 1992https://pubs.acs.org/doi/10.1021/j100193a072https://doi.org/10.1021/j100193a072research-articleACS...
We report on structural properties of PEO−PPO−PEO type triblock block copolymers (Pluronics F127) with special emphasis the effect diblock PEO−PPO impurities ordered gel phase. Commercial F127 polymers contain as received roughly 20% and 80% copolymers. Aqueous solutions used form fcc micellar structure. Copolymers depleted respect to impurity, resulting in a pure copolymer system, bcc micelles within major parts However, close disorder-to-order transition, purified system also forms...
Actin is the major protein of eukaryote peripheral cytoplasm where its mechanical effects could determine cell shape and motility. The properties purified F-actin, whether it a viscoelastic fluid or an elastic solid, have been subject controversy. Mainstream polymer theory predicts that filaments as long those found in F-actin are so interpenetrated to appear immobile measurements over reasonable time with available instrumentation fluidity only be manifest if were shortened. We show static...
Abstract The frequency dependences of the storage and loss shear moduli, G ′ ″, pronase‐treated collagen dissolved in acetate buffer at pH 4.0 were measured 17.0°C by use Birnboim‐Schrag multiple lumped resonator apparatus. Some solutions contained 70% glycerol. infinite‐dilution moduli determined compared with theoretical models for a rigid cylinder semiflexible rod. Only latter could fit data. A rotational time 144 μ s slowest flexural relaxation 21 , both reduced to water 20°C, from fit....
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFlexibility of myosin rod determined from dilute solution viscoelastic measurementsSoeren Hvidt, F. Henry M. Nestler, Marion L. Greaser, and John D. FerryCite this: Biochemistry 1982, 21, 17, 4064–4073Publication Date (Print):August 1982Publication History Published online1 May 2002Published inissue 17 August 1982https://pubs.acs.org/doi/10.1021/bi00260a024https://doi.org/10.1021/bi00260a024research-articleACS PublicationsRequest reuse...
Pluronic P85 (poloxamer 235), which is a symmetrical PEO−PPO−PEO triblock copolymer of poly(ethylene oxide) and poly(propylene oxide), has been investigated by differential scanning calorimetry chromatography. Interaction chromatography at critical conditions for PEO was used chromatographic characterization preparative separation according to PPO block lengths. The results show that the sample heterogeneous with respect chemical composition molar mass. contains 12 wt % lower size...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA comparison of relaxation time distributions obtained from dynamic light scattering and mechanical measurements for high-molecular-weight polystyrene in entangled solutionsTaco Nicolai, Wyn Brown, Soeren Hvidt, Kurt HellerCite this: Macromolecules 1990, 23, 24, 5088–5096Publication Date (Print):November 1, 1990Publication History Published online1 May 2002Published inissue 1 November...
Rana esculenta tropomyosin assembles in vivo into a coiled-coil α helix from two different subunits, and β, which are present about equal concentrations. Although the native composition is αβ, mixture of amounts αα ββ produced by refolding dissociated β at low temperature vitro. Refolding kinetics showed that formed first was relatively stable with regard to chain exchange below approximately 20°C. Equilibration homodimer 30° 34°C for long times, however, resulted formation αβ molecule...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFlexibility of light meromyosin and other coiled-coil α-helical proteinsSoren Hvidt, John D. Ferry, Daniel L. Roelke, Marion GreaserCite this: Macromolecules 1983, 16, 5, 740–745Publication Date (Print):May 1, 1983Publication History Published online1 May 2002Published inissue 1 1983https://pubs.acs.org/doi/10.1021/ma00239a007https://doi.org/10.1021/ma00239a007research-articleACS PublicationsRequest reuse permissionsArticle...
Synergy between cellulolytic enzymes is essential in both natural and industrial breakdown of biomass. In addition to synergy endo- exo-lytic enzymes, a lesser known but equally conspicuous occurs among exo-acting, processive cellobiohydrolases (CBHs) such as Cel7A Cel6A from Hypocrea jecorina. We studied this system using microcrystalline cellulose substrate found degree 1.3 2.2 depending on the experimental conditions. enzyme variants without carbohydrate binding module (CBM) its linker...