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  • Wiley-Blackwell  (76)
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  • 1
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 10 (1975), S. 295-312 
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectra of a series of thirteen m- and p-substituted benzils have been determined at several ionising voltages below 20 eV and at 70 eV. At ionising voltages up to 5 eV above the ionisation potentials the benzil molecular ions decompose entirely by two pathways to give substituted and unsubstituted benzoyl ions. Fractional intensities of the molecular ion (FM), substituted (FX) and unsubstituted (FH) benzoyl ions were obtained for each benzil as a function of energy from measured ionisation efficiency curves, and ionisation and appearance potentials for all major ions determined from the ionisation efficiency curves by a semilogarithmic method. Various correlations of ion intensity and energy parameters with δ+ and δ constants are examined; these are generally poor. Fair correlations are obtained between log (FX/FH) or (AP(XC6H4CO)+ - AP(C6H5CO)+) and δ or δ+, and these are interpreted in terms of the expected effect of substituents on the stabilities of the product ions in the decompositions. A good correlation is observed between log (FX/FH) and AP(XC6H4CO)+ · AP(XC6H5CO)+; this suggests that substituents affect FX/FH mainly by changing the activation energies for the competing decompositions of the molecular ions. The competitive shift has a marked effect on these appearance potentials so that in this system AP - IP is not a good measure of the activation energy for the primary decompositions.
    Additional Material: 5 Ill.
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  • 2
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Diallyldimethylsilane provides a source of the allyldimethylsilyl cation in the ion cyclotron resonance spectrometer; reaction of this cation with alcohols (ROH) produces adducts which decompose by loss of C3H6 to yield the ion \documentclass{article}\pagestyle{empty}\begin{document}$ \left[{{\rm Me}_2 \mathop {\rm S}\limits^{\rm + } {\rm i} - {\rm OR}} \right] $\end{document}. This elimination is thought to occur by a 1,5-hydrogen shift, together with either stepwise or concerted silicon-carbon bond cleavage. The corresponding aducts from ethers R—O—R1 (R1≥R, R1≥Et) first lose (R1—H·) and then undergo the elimination described above.
    Additional Material: 1 Ill.
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  • 3
    ISSN: 0363-9061
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences
    Notes: It is becoming increasingly important, from an environmental viewpoint, to minimize vibrations induced in urban dwellings by blasting. The present study illustrates how the delay interval between blastholes can be chosen to control and minimize the vibration energy within the structural response band of most houses. In particular, it is shown that the only possibility of reducing such energy is to employ a delay interval in the range 10-35 ms. However, the induced vibrations are also dependent upon the accuracy of the delay initiators as well as the level of random fluctuations between each blasthole signature. It is shown that only very accurate electronic delays give the possibility of utilizing fully the delay sequence in order to control structural vibrations. If the vibration emission from each blasthole is totally uncorrelated with that of any other blasthole then the resulting amplitude spectrum of the blast will be totally unpredictable. This situation occurs irrespective of the delay initiation sequence or its accuracy. Under these conditions it is impossible to predict the blast-induced energy lying within the structural response band.
    Additional Material: 21 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 190 (1989), S. 2279-2286 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Chitosan films were prepared by casting from solutions in dilute acetic acid containing methanol, acetone, or dimethyl sulfoxide. Induced changes in the structural orientation of the molecules within the film were studied by wide angle X-ray diffraction, and it was shown that the presence of a high concentration of organic solvent in solution altered the crystal structure of the resultant films, rendering them insoluble in water. Benzoylated and butyrylated derivatives of chitin and chitosan were prepared and characterised by infrared spectroscopy. Films of these derivatives were prepared by casting from a number of organic solvents and water, and the structures examined in more detail by wide angle X-ray diffraction. The introduction of the aliphatic and aromatic groups to the polysaccharide backbone was thus shown to disrupt the natural orientation of the polymer chains; the solubility of the acylated derivatives is discussed with respect to these structural changes.
    Additional Material: 6 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 4 (1970), S. 291-298 
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectra of a series of mono-substituted hydrazine salts are presented and fragmentation pathways suggested. Comparisons with the free bases are made.
    Additional Material: 9 Ill.
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  • 6
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Metastable peak shapes, dimensions and relative abundances have been measured for the fragmentations ions were generated from but 1-ene, cis-and trans- but-2-ene, 2-methylpropene, methylcyclopropane and cyclobutane. Forward and reverse activation energies for the above reactions have been estimated and daughter ion structures proposed. The pathway for the consecutive reaction which generates the metastable peak (m/e 56 → m/e 53) is proposed to be Observations on metastable peaks for fourteen assorted daughter ion fragmentations are also presented and the thermochemistry and daughter ion structures for some of the reactions are discussed. Metastable peaks for the fragmentation of ions generated by field ionization are also described.
    Additional Material: 4 Ill.
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  • 7
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 2 (1969), S. 923-928 
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 5 Ill.
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  • 8
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 22 (1956), S. 186-186 
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Fluorescence energy transfer using flow cytometric measurements was utilized to determine the proximity of concanavalin A receptors on the surface of HL-60 promyelocytic leukemia cells before and after induction of differentiation. The HL-60 cells were induced to differentiate into granulocytes using dimethylsulfoxide and into macrophages using 12-O-tetradecanoylphorbol-13-acetate. Concanavalin A was labeled with either fluorescein (donor chromophore) or tetramethylrhodamine (acceptor chromophore), and these species were used to determine lectin proximity. With granulocytic differentiation, the amount of concanavalin A bound remained constant, but a decrease in receptor density was observed. During macrophage differentiation, however, both receptor density and receptor number increased. The increase in concanavalin A binding during differentiation appears to be a result of maturation rather than an initiating event.
    Additional Material: 5 Ill.
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  • 10
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: A monospecific antibody to rat uterine collagenase has been produced and employed to study the cell of origin and the time course of production of this enzyme in the involuting rat uterus. The specificity of the anti-collagenase antibody was confirmed by immunoprecipitation, Western analysis, and by its ability to inhibit the activity of collagenase. Parallel measurements of functional enzyme, both latent and active, bound to tissue collagen were also made in nonpregnant, gravid, and postpartum rat uteri. Immunohistochemical staining of collagenase in sections of rat uterus showed the enzyme to be present in the perinuclear region of the smooth muscle cells only of the involuting myometrium. No detectable collagenase was present in the prepartum or nonpregnant uterus. Identity of the smooth muscle cells was confirmed using an anti-smooth muscle actin antibody. In addition, the cultured uterine cells from which the immunizing antigen was obtained were also identified as smooth muscle cells. Specificity of the tissue staining was confirmed by the ability of pure rat uterine collagenase to block the reaction of the antibody with the tissue. These observations indicate that smooth muscle cells are capable of producing collagenase and are consistent with the hypothesis that this enzyme presides over the massive collagen degradation seen in postpartum uterine involution. Furthermore, measurement of collagenase bound to uterine collagen revealed that collagenase activity could be detected only at the time that the cells could be seen to be producing the enzyme by immunolocalization. These findings support the concept that collagenase is produced only as needed and not stored, either intra- or extracellularly.
    Additional Material: 7 Ill.
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