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  • Articles: DFG German National Licenses  (4)
  • Chemistry  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Effect of aggregation of p-phenylphenol on enzymatic polymer synthesis in dioxane/water mixture (1995)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 33 (1995), S. 2339-2345 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The state of p-phenylphenol molecules in dioxane/water mixture, a commonly used reaction system for enzymatic polymerization of phenols and aromatic amines, was investigated by difference UV absorption spectroscopy and Fourier transform (FT) Raman spectroscopy. The aggregate of p-phenylphenols is found on the basis of the exciton peaks observed in difference UV absorption spectra. FT Raman spectroscopy demonstrates further that p-phenylphenol molecules aggregate together in “face to face” fashion. A simplified model is proposed for aggregation of p-phenylphenol molecules in dioxane/water mixture, which can elucidate the variation of the molecular weight of poly (p-phenylphenol) coupled in the reaction system. © 1995 John Wiley & Sons, Inc.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1995.080331406
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Matrix-assisted laser desorption with ultra-short laser pulses (1992)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 6 (1992), S. 187-191 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: An excimer pumped dye laser generating ultra-short (560 fs full width at half maximum, FWHM) pulses in the ultraviolet (UV, 248 nm) and visible (496 nm) spectral ranges is used to desorb protein ions from different matrices. The effects of laser-light energy and power density on secondary-ion yields from insulin are reported. These data are compared to data obtained by employing a nitrogen laser (337 nm, 3 ns FWHM). The existence of a threshold energy density for the matrix-asisted laser desorbtion (MALD) of insulin ions by the ultra-short pulses is established. This threshold energy is of the same order of magnitude for the two laser systems employed and does not depend on the laser pulse length (the energy deposition time). Thus we demonstrate that the amount of laser energy deposited into the sample, rather than the laser power, is the important parameter in the MALD process.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290060307
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Separation of fructose and glucose mixture by zeolite Y (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 40 (1992), S. 498-504 
    Details
    ISSN: 0006-3592
    Keywords: separation ; Zeolite Y ; effects of cation ; glucose and fructose ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Na-, K-, Ba-, and Ca-Y were employed for the separation of fructose and glucose in an adsorption column. Effects of temperature, solvent flow rate, amount of mixture injection, and exchangeable cations on the separation were investigated. Efficiency of separation was used as a criterion to characterize the effectiveness of the separation. The transport and kinetic parameters for the column separation were also presented. From simple pulse experiments and moment analysis, the obtained process information of equilibrium and dynamic parameters might be used to design, operate, and control the separation column. © 1992 John Wiley & Sons, Inc.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260400408
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Molecular recognition of watson-crick base-pair reversals in triple-helix formation: Use of nonnatural oligonucleotide bases (1993)
    New York : Wiley-Blackwell
    Biopolymers 33 (1993), S. 1317-1325 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: We report the calculated characteristics of nonnatural triplex-forming oligonucleotide (TFO) bases recognizing base-pair reversals (TA → AT) in a double-helical DNA sequence. Ab initio and molecular mechanics calculations have been carried out to characterize the geometric and energetic consequences at the base-pair reversal sites. We have estimated the free energies of solvation of the natural and proposed bases by solving the linearized Poisson-Boltzmann equation. The calculations indicate that the proposed TFO bases should bind with some specificity to the duplex. Implications of the strategy used in the context of molecular biology is discussed. © 1993 John Wiley & Sons, Inc.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360330902
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    Paper (German National Licenses)
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