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  • 1
    Electronic Resource
    Electronic Resource
    The rheological behaviour of suspensions of fat particles in oil interpreted in terms of a transient-network model (1986)
    Springer
    Colloid & polymer science 264 (1986), S. 282-282 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01414967
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  • 2
    Electronic Resource
    Electronic Resource
    The rheological behaviour of suspensions of fat particles in oil interpreted in terms of a transient-network model (1985)
    Springer
    Colloid & polymer science 263 (1985), S. 1008-1024 
    Details
    ISSN: 1435-1536
    Keywords: Suspension ; fat particles ; rheological behaviour ; structured dispersion ; transient-network model
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The transient-network model for concentrated dispersions, described in a previous paper, is used to describe the rheological behaviour of dispersions of glyceryl tristearate crystals in paraffin oil. The model prediction of the storage modulus of this system is compared with corresponding expressions given in literature. Model calculations are carried out to fit the linear viscoelastic behaviour of the system as well as its stress response in large amplitude shear experiments. Information is thus obtained about the stiffness and strength of the interparticle bonds, and the chance of them breaking in a state of rest or as the result of flow. It is concluded that the probability of interparticle bond fracture strongly depends on the measure of bond stretching. The general findings link up with the Lennard-Jones potential which is assumed to describe the potential energy of the bonds between the particles. Accurate measurements of the temperature dependence of the dynamic moduli by making use of a torsion resonator lead to the conclusion that the energy dissipation at a high frequency originates mainly from the flow of liquid around the particles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01410995
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  • 3
    Electronic Resource
    Electronic Resource
    Ochrobactrum anthropi NCIMB 40321: a new biocatalyst with broad-spectrum l-specific amidase activity (1993)
    Springer
    Applied microbiology and biotechnology 39 (1993), S. 296-300 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Of 125 microorganisms that were able to use α-hydroxy acid amides as sole nitrogen source, Ochrobactrum anthropi NCIMB 40321 was selected for its ability to hydrolyse racemic amides l-selectively. The substrate specificity of whole O. anthropi cells is remarkably wide and ranges from α-H-α-amino-, α-alkyl-α-amino, N-hydroxy-α-amino acid amides to α-hydroxy-acid amides. After 50% conversion, both the l-acids formed and the remaining d-amides were present in 〉99% enantiomeric excess, and ammonia accumulated in stoichiometric amounts. Using mandelic acid amide as a model substrate, the hydrolysis was optimized. Optimal rates were observed at pH 8.5 at 50°C. At higher temperatures the initial rate was even higher; however, fairly rapid inactivation occurred.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00192081
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  • 4
    Electronic Resource
    Electronic Resource
    Production of 1-kestose with intact mycelium of Aspergillus phoenicis containing sucrose-1F-fructosyltransferase (1991)
    Springer
    Applied microbiology and biotechnology 35 (1991), S. 216-221 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary Favourable reaction conditions for the enzymatic production of 1-kestose by sucrose-1F-fructosyltransferase, SFT (EC 2.4.1.99) from Aspergillus phoenicis CBS 294.80 mycelium were established. The intracellular enzyme SFT works best at 60°C, exhibits a relatively high thermostability and possesses an alkaline pH optimum. An invertase also present in the mycelium of A. phoenicis possesses an acidic pH optimum. Consequently, around pH 8.0 sucrose is converted mainly to 1-kestose and nystose while fructose is only formed in relatively small amounts. Under optimal conditions (55° C, pH 8.0 and an initial sucrose concentration of 750 g 1-1) a yield of about 300 g 1-kestose per 1.01 reaction mixture could be achieved after 8 h.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00184689
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  • 5
    Electronic Resource
    Electronic Resource
    A generalized network model for polymeric liquids (1983)
    Springer
    Rheologica acta 22 (1983), S. 539-549 
    Details
    ISSN: 1435-1528
    Keywords: Constitutive equation ; transient-network model ; bead-spring model ; molecular structure ; polymer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract A kinetic model was developed for relating the molecular structure and the rheological behaviour of polymer-like materials in which bonds are being created and broken. In particular, the stress contribution of molecules that are not a part of the network was taken account of. In two limiting cases the model introduced here is identical to the transient-network model and the bead-spring model, respectively. Model predictions were interpreted and compared with measurements on an L.D.-polyethylene melt, available from literature, and an S.I.S.-blockcopolymer solution. In both cases information was obtained about the network and the kinetic processes occurring in a state of rest and during steady-shear flow, assuming the model to be valid.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01351400
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  • 6
    Electronic Resource
    Electronic Resource
    Stress relaxation due to chain fractures in transient polymer networks (1985)
    Springer
    Rheologica acta 24 (1985), S. 198-201 
    Details
    ISSN: 1435-1528
    Keywords: Stress relaxation ; polymer ; transient-network theory
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract Aspects of a network model for concentrated dispersions are applied to polymer networks. It is shown how network deformation caused by network fracture affects the macroscopic stress.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01333247
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  • 7
    Electronic Resource
    Electronic Resource
    A transient-network model describing the rheological behaviour of concentrated dispersions (1984)
    Springer
    Rheologica acta 23 (1984), S. 329-344 
    Details
    ISSN: 1435-1528
    Keywords: Transient-network model ; stress tensor ; relaxation spectrum ; concentrated dispersion ; conglomerate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract Attractive forces acting between particles in dispersions may cause a three-dimensional structure to be built up. A temporary-network model is postulated that describes the rheological behaviour of such systems. Chains of particles are assumed to be created and broken by thermal actions and by applied deformation. The relation between the network structure and the macroscopic stress tensor is deduced. One of the main model features is that no use is made of the common assumption of affinity of the motion of the chain vectors with the gradient of the macroscopic velocity field. Instead, the chain deformations are assumed to depend on the forces acting on them, i.e. their deformations depend on their stiffness and on the applied deformation, whereas fracture of chains may cause stress relaxation in the rest of the network. The chains may behave as highly non-linear springs, whereas the probability that the chains will break in some time interval may be an explicit function of the chain length itself. Integral equations are derived, from which the stress-tensor components can be calculated in any flow experiment, that obeys creeping-flow conditions. Analytical expressions are obtained for the relaxation spectrum of such systems in terms of the microscopic parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01329186
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  • 8
    Electronic Resource
    Electronic Resource
    Detection ofAspergillus andPenicillium extracellular polysaccharides (EPS) by ELISA: using antibodies raised against acid hydrolysed EPS (1992)
    Springer
    Antonie van Leeuwenhoek 61 (1992), S. 323-332 
    Details
    ISSN: 1572-9699
    Keywords: extracellular polysaccharides ; antibodies ; immuno-assay ; Aspergillus ; Penicillium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Species of the fungal generaAspergillus andPenicillium produce immunologically active extracellular polysaccharides (EPS) in which galactofuranose residues are immunodominant. The antigenic determinant of the EPSA. fumigatus, A. niger andP. digitatum could be removed by acid hydrolysis. Due to the hydrolysis of the EPS the immunological reaction between IgG anti-native EPS and hydrolysed EPS disappeared. Antibodies raised in rabbits against the acid hydrolysed EPS revealed new antigenic determinants that were exposed as a result of the acid hydrolysis. Immunological inhibitory experiments showed that the antibodies were no longer directed to galactofuranose residues. Enzyme Linked Immunosorbent Assay, carried out with antibodies raised against the acid hydrolysed EPS showed that the antibodies against the acid hydrolysed EPS were more species specific in comparison with the antibodies against the native EPS.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00713940
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  • 9
    Electronic Resource
    Electronic Resource
    First unequivocal observation of the multiple fully extended conformation (25-helix) in a homopeptide from a Cα-methylated chiral α-amino acid (1995)
    Springer
    International journal of peptide research and therapeutics 1 (1995), S. 157-162 
    Details
    ISSN: 1573-3904
    Keywords: C5 conformation ; Crystal structure ; 25-Helix ; (αMe)Leu peptide ; X-ray crystallography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary An X-ray diffraction analysis of pBrBz-[d-(αMe)Leu]3-OtBu revealed that in the crystal state this terminally blocked tripeptide adopts a multiple fully extended conformation (25-helix). This is the first unequivocal observation of such a structure in a homopeptide from a Cα-methylated chiral α-amino acid. No intermolecular NH. . . O=C H- bonds are seen in the crystal packing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00117951
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  • 10
    Electronic Resource
    Electronic Resource
    Cα-Methyl, Cα-phenylglycine peptides: A structural study (1998)
    Springer
    International journal of peptide research and therapeutics 5 (1998), S. 223-225 
    Details
    ISSN: 1573-3904
    Keywords: β-bend ; disubstituted glycines ; fully extended conformation ; 310-helix ; Cα-methylated α-amino acids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary In order to obtain further information on the role played by phenyl ring position in the Cα-methylated α-amino acid side chain on peptide preferred conformation, the crystal-state structural preferences of Cα-methyl, Cα-phenylglycine peptides have been determined by X-ray diffraction. This study shows that either the fully extended conformation or the β-bend/310-helical structures are adopted by peptides characterized by this Cα-methylated, β-branched, aromatic α-amino acid.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02443473
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