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  • 1
    Electronic Resource
    Electronic Resource
    Cyclic β-alanyl-β-alanine containing peptides: A new molecular tool for β-turned peptides (1990)
    New York : Wiley-Blackwell
    Biopolymers 30 (1990), S. 189-196 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In the present paper we describe the synthesis, purification, and single-crystal x-ray analysis of the cyclic tetrapeptide cyclo-(L-Pro-L-Phe-β-Ala-β-Ala). This compound contains the β-alanyl-β-alanine dipeptide as putative cyclization arm to force the remaining dipeptide-L-Pro-L-Phe- in a β-turned conformation. Thepeptide was synthesized by classical methods and cyclization of the free linear tetrapeptide was accomplished in reasonable yields in diluted methylene chloride solution. The compound crystallizes in space group P21 from hot water with two independent tetrapeptide molecules and seven solvent molecules in the unit cell. This compound shows in the solid state an intramolecular hydrogen bond between the CO group of the β-Ala4 and the NH group of the β-Ala3 residues stabilizing a type I β-turn conformation in which Pro1 and Phe2 occupy the relative position 2 and 3 of the turn, respectively. A rather complex network of 18 hydrogen bonds involving all the remaining CO and NH groups and the water molecules is present in the crystal.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360300118
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    β-Alanyl-β-alanine in cyclic β-turned peptides (1991)
    New York : Wiley-Blackwell
    Biopolymers 31 (1991), S. 1181-1188 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In the present paper we describe the synthesis, purification, and single crystal x-ray analysis of the cyclic pentapeptide cyclo-(L-Pro-L-Pro-L-Phe-β-Ala-β-Ala). The peptide was synthesized by classical solution methods and the cyclization of the free pentapeptide was accomplished in good yields in diluted methylenechloride solution using N,N-dicyclohexylcarbodiimide. The compound crystallizes in the monoclinic space group P21 from hot water with five solvent molecules. The Pro1-Pro2 peptide bond is cis and the molecular conformation is stabilized by an intramolecular hydrogen bond between the CO group of the β-Ala5 and the NH of the Phe3 residue. The Pro1-Pro2 segment occupies the relative positions 2 and 3 of a type VIa β-turn, while the L-phenylalanyl-β-alanyl-β-alanine segment is incorporated in a C13-like ring structure. The crystal packing is characterized by a network of 11 intermolecular hydrogen bonds involving all the remaining CO, NH, and the water molecules.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360311006
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  • 3
    Electronic Resource
    Electronic Resource
    Studies on the blends of carbon dioxide copolymer. III. NBR/PPC systems (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 61 (1996), S. 1479-1486 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: In this paper, the blends of the carbon dioxide copolymer, poly(propylene carbonate) (PPC), with nitrile rubber (NBR) were studied by DSC, DMA, TEM and TG. PPC can enhance the mechanical properties of NBR, while oil resistance and tensile set at break of NBR/PPC systems were as good as that of NBR. The coagent of triallylisocyanurate or maleic anhydride with carbon black can much improve the curing efficiency of dicumyl peroxide in NBR/PPC systems. © 1996 John Wiley & Sons, Inc.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Dual enzyme amperometric biosensor for putrescine with interference suppression (1995)
    Weinheim : Wiley-Blackwell
    Electroanalysis 7 (1995), S. 105-108 
    Details
    ISSN: 1040-0397
    Keywords: Putrescine ; Polyamine ; Enzyme electrode ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A putrescine biosensor has been developed. Putrescine oxidase, peroxidase, and bovine serum albumin were cross-linked directly on the surface of a graphite electrode by glutaraldehyde. The sensor was used to determine putrescine at 0 mV (vs. Ag/AgCl reference electrode) in a potassium phosphate buffer (pH 7.4) solution containing 4 mM dopamine (3-hydroxytyramine). The response of putrescine was linear up to 600 μM with a standard deviation of 2.8%. The detection limit was 5 μM. The response time was around 30 s. The lifetime was over 30 days when the electrode was used every day. The interferences of cadaverine and spermidine could be eliminated by added dopamine which, apparently, inhibits the enzymatic conversion of these substrates more strongly than that of putrescine.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140070202
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  • 5
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    Observation of the geometric phase effect in the H + HD -〉 H2 + D reaction (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2018-12-14
    Description: Theory has established the importance of geometric phase (GP) effects in the adiabatic dynamics of molecular systems with a conical intersection connecting the ground- and excited-state potential energy surfaces, but direct observation of their manifestation in chemical reactions remains a major challenge. Here, we report a high-resolution crossed molecular beams study of the H + HD -〉 H 2 + D reaction at a collision energy slightly above the conical intersection. Velocity map ion imaging revealed fast angular oscillations in product quantum state–resolved differential cross sections in the forward scattering direction for H 2 products at specific rovibrational levels. The experimental results agree with adiabatic quantum dynamical calculations only when the GP effect is included.
    Keywords: Chemistry
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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