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  • 1
    Electronic Resource
    Electronic Resource
    Racemization in the synthesis of sequential polypeptides using N-hydroxysuccinimide esters (1976)
    New York : Wiley-Blackwell
    Biopolymers 15 (1976), S. 1585-1590 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Racemization in the synthesis of peptide intermediates and their polymers was investigated, using L-amino acid oxidase. The formation of N-hydroxysuccinimide esters from N-protected peptide acids yielded optically pure products in contrast to p-nitrophenyl and pentachlorophenyl active esters. The racemization in the polymerization step was found to be base sensitive. Partially racemized polymer can result from optically homogeneous monomer. Thus, the optical integrity of active monomer species carries no guarantee for that of the polymer.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1976.360150812
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  • 2
    Electronic Resource
    Electronic Resource
    Racemization in the synthesis of polytripeptide models of collagen (1976)
    New York : Wiley-Blackwell
    Biopolymers 15 (1976), S. 317-324 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Racemization in the synthesis of tripeptide intermediates and their polymers was investigated, using L-amino acid oxidase. Stepwise investigation of peptide intermediates showed no racemization during peptide coupling steps or deprotection of benzyl esters by hydrogenolysis. Saponification of one of the methyl esters produced some racemization. Preparation of active esters from N-protected tripeptide acids containing optically active C-terminal amino acid, with one exception, produced racemization. The fractionated polymers were found to contain less racemized amino acids than the crude products or starting monomeric tripeptides, indicating that the racemized sequences gave rise to lower molecular-weight oligomers. The sequences investigated were -Pro-Pro-Ala-, -Ala-Pro-Pro-, -Val-Pro-Pro-, -Pro-Pro-Leu-, -Pro-Gly-Leu-, -Pro-Gly-Phe-, -Pro-Gly-Val-, -Gly-Val-Pro-, -Phe-Pro-Gly-, -Leu-Pro-Gly-, and Ile-Pro-Gly-.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1976.360150209
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  • 3
    Electronic Resource
    Electronic Resource
    FLOW OF A VISCOELASTIC FLUID BETWEEN TWO ROTATING CIRCULAR CYLINDERS SUBJECT TO SUCTION OR INJECTION (1997)
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 24 (1997), S. 337-349 
    Details
    ISSN: 0271-2091
    Keywords: Oldroyd-B ; non-Newtonian ; boundary layer ; collocation ; spline ; Engineering ; Numerical Methods and Modeling
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The steady flow of an Oldroyd-B fluid between two porous concentric circular cylinders is studied. The equation of motion and the constitutive equations form a system of non-linear ODEs that is solved numerically, and in a few cases the numerical results are compared with a known analytical solution. We consider the effect of the non-Newtonian nature of the fluid on the drag and on the boundary layer structure near the walls. Numerical computations show the effect of the non-Newtonian quantities on the velocity and on the shear stress as the dimensionless parameters are varied. © by 1997 John Wiley & Sons, Ltd.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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