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  • 1
    Electronic Resource
    Electronic Resource
    A novel mobile phase for continuous-flow liquid secondary ion mass spectrometry of high molecular mass phthalocyanines (1993)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 28 (1993), S. 475-477 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210280437
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  • 2
    Electronic Resource
    Electronic Resource
    Fracture behavior in nylon 6 fibers (1972)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-2: Polymer Physics 10 (1972), S. 1415-1445 
    Details
    ISSN: 0449-2978
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A reaction rate model of fracture in polymer fibers is described. This model assumes that bond rupture is governed by absolute reaction rate theory with a stress-aided activation energy. It is demonstrated that the key in obtaining good agreement between the model and experiment lies in taking proper account of the variation of stress on the tie-chain molecules. The more taut chains rupture first, and the load is redistributed among the remaining unruptured tie chains. The effect of varying the temperature both in the model and in experiments on fracture in fibers is explored. Good agreement between predictions of the model and experiment is possible only with an undeterstanding of the distribution in stress on the tie chains. The distribution in stress on the chains was experimentally determined by monitoring the kinetics of bond rupture with electron paramagnetic resonance (EPR) spectroscopy. Temperature is found to have two effects on macroscopic strength. (1) The thermal energy aids the atomic stress in breaking the atomic bonds; as a consequence the rate of bond rupture of a family of bonds under a given molecular stress is increased. In this respect temperature might be viewed as decreasing the “strength” of a bond. (2) Temperature also serves to “loosen” the molecular structure and in this way modify the distribution in stress on the tie chains. To explain bond rupture and macroscopic fracture behavior quantitatively, account must be taken of both effects.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1972.160100802
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  • 3
    Electronic Resource
    Electronic Resource
    Matrix-assisted laser desorption/ionization mass spectrometry of synthetic oligodeoxyribonucleotides (1992)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 6 (1992), S. 369-372 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry has been used to mass analyze a variety of synthetic oligodeoxyribonucleotides ranging in size from 6 to 30 nucleotides. Molecular ions were observed almost exclusively, with little or no fragmentation and generally minor contributions from multiply charged species. Mixtures of poly d(T)12-30 with low picomole amounts of each component gave well resolved peaks. These results are encouraging for the concept of DNA sequence analysis by mass spectrometry.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290060603
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  • 4
    Electronic Resource
    Electronic Resource
    Identification of dissolved volatile metabolites in microbial cultures by membrane inlet tandem mass spectrometry (1991)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 20 (1991), S. 253-258 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A membrane inlet tandem mass spectrometer is used for easy identification of volatile metabolites in microbial cultures. Filtrates of the cultures are without further purification placed into a measuring cell and introduced via a membrane inlet into a triple-quadrupole mass spectrometer. The samples are analysed with electron impact and chemical ionization mass spectrometry and tandem mass spectrometry. An extra dimension of separation is obtained by utilizing differences in response time due to differences in transport rates through the membrane. The following examples are used to demonstrate the technique. (i) Filtrates from cultures of three parasitic protozoa (trichomonads); two different strains of Trichomonas vaginalis isolated from humans and from Tritrichomonas foetus isolated from cattle were analysed. Indole was found in all samples; dimethyl disulphide was also present in cultures of the two organisms isolated from humans. (ii) The yeast Brettanomyces was grown in the presence of coumaric acid, ferulic acid, vanillic acid or syringic acid and the filtrate analysed for volatile products. In all cases ethyl acetate was found; coumaric acid biotransformation also gave 4-ethylphenol, whereas ferulic acid also gave 4-ethyl-2-methoxyphenol.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200200504
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  • 5
    Electronic Resource
    Electronic Resource
    Rapid and direct monitoring of volatile fermentation products in the fungus Bjerkandera adusta by membrane inlet tandem mass spectrometry (1993)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 22 (1993), S. 585-589 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Membrane inlet tandem mass spectrometry has been used for the identification of volatiles directly from growth media of the fungus Bjerkandera adusta. Chloromethoxybenzaldehyde, a major fermentation product not previously described, was identified, as well as the known products p-methoxybenzaldehyde and benzaldehyde. The production of benzaldehyde was commenced shortly after incubation; p-methoxybenzaldehyde and chloromethoxybenzaldehyde were produced after a few days. No qualitative differences were found between samples grown with different amino acids added to the growth media, but tyrosine supplementation enhanced production of p-methoxybenzaldehyde.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200221005
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  • 6
    Electronic Resource
    Electronic Resource
    The analysis of mock DNA sequencing reactions using matrix-assisted laser desorption/ionization mass spectrometry (1993)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 7 (1993), S. 895-897 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: A mock sequencing experiment is described in which matrix-assisted laser desorption/ionization (MALDI) mass spectrometry is used to analyze mixtures of synthetic oligodeoxynucleotides chosen to match the first 24 DNA fragments generated in typical sequencing reactions using a standard M13mp19 template and primer. The experiments permitted the evaluation of important issues relating to resolution, sensitivity, multiple charging, and adduct formation. Mass resolutions (full width at half maximum) were between 100 and 200, and it was relatively straightforward to assign bases in the sequencing simulation using subpicomolar quantities of material. These results demonstrate the potential of MALDI mass spectrometry in DNA sequence analysis.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290071008
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  • 7
    Electronic Resource
    Electronic Resource
    The mass spectra of five diacetyl[3]ferrocenophanes (1972)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 6 (1972), S. 1279-1281 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A mass spectrometric study of five diacetyl[3]ferrocenophanes has been made. The molecular ion was the base peak in these five compounds. Fragment ions with relative intensities greater than 10 percent occurred only in those compounds having an acetyl group in the alpha position to the trimethylene bridge.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210061112
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  • 8
    Electronic Resource
    Electronic Resource
    Acidity and stability of sulfonyl carbamates and ureas (1971)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 9 (1971), S. 3059-3061 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1971.150091025
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