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  • 1980-1984  (9)
  • 1975-1979  (3)
  • 1910-1914  (3)
  • 1
    Electronic Resource
    Electronic Resource
    SOME DERIVATIVES OF PARA-AMINOBENZOHYDROL.2 (1911)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 33 (1911), S. 56-59 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja02214a006
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 33 (1911), S. 56-56 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja02214a600
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    A METHOD FOR DETERMINING THE MOLECULAR WEIGHTS OF VOLATIL LIQUIDS. (1912)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 34 (1912), S. 1290-1293 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja02211a002
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    ULTRASTRUCTURAL STUDIES ON THE ACETYLCHOLINE RECEPTOR AT MOTOR END PLATES OF NORMAL AND PATHOLOGIC MUSCLES (1976)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 274 (1976), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1976.tb47678.x
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  • 5
    Electronic Resource
    Electronic Resource
    The density of cholinergic receptors at the endplate postsynaptic membrane: Ultrastructural studies in two mammalian species (1975)
    Springer
    The journal of membrane biology 20 (1975), S. 31-49 
    Details
    ISSN: 1432-1424
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Summary Electron-microscope autoradiography of diaphragm endplates of the American brown bat, labeled to saturation with tritiated α-bungarotoxin, has been used as a means to localize and quantitate the acetylcholine receptor there. Analysis of the grain distribution in these autoradiographs reveals that the receptor sites in this endplate are located on the postsynaptic membrane at an average density of 8,800/μ2. The sites are distributed asymmetrically along that membrane, being concentrated at the crests of the postjunctional folds—that portion nearest to the presynaptic membrane. The receptor site density at these regions of the postsynaptic membrane is estimated to be 20,000–25,000/μ2 of membrane surface. A comparison of these membrane site densities with those of endplates of red and white fibers of the mouse reveals a close similarity. On this basis, it is suggested that the receptor site density at the crests of the folds may be a characteristic feature of endplates of vertebrates. In contrast to the acetylcholine receptor sites, cholinesterase sites (determined autoradiographically in3H-diisopropylfluorophosphate-labeled endplates) are largely distributed in a uniform manner over the postjunctional folds. The function of the secondary folds is, therefore, reassessed. Ultrastructural evidence available from other laboratories on the spatial characteristics of transmitter release and of postsynaptic dense particles is in accord with a model drawn for this molecular architecture at the vertebrate endplate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01870626
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  • 6
    Electronic Resource
    Electronic Resource
    Correction of phase errors in fourier spectroscopy (1983)
    Springer
    International journal of infrared and millimeter waves 4 (1983), S. 273-298 
    Details
    ISSN: 1572-9559
    Keywords: Fourier transform spectroscopy ; phase correction ; interferometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The correction of phase error in Fourier transform spectroscopy is discussed. Phase error is corrected by multiplying the inverse transform of the measured interferogram by e−iϕ(ω), where ϕ(ω) is the phase error in the spectrum. This error is determined from a low-resolution, two-sided interferogram. It is absolutely essential that the truncation-apodization function which multiplies the interferogram have an even part which is symmetric about the x=0 position. If this function is not properly located, large errors in the corrected spectrum can occur.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01008607
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  • 7
    Electronic Resource
    Electronic Resource
    A novel mass marker for metastable ion scans in a double focusing mass spectrometer (1980)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 15 (1980), S. 564-567 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Characterization and assignment of the products of metastable decompositions which are transmitted by a double focusing mass spectrometer, is often complicated by the inability to measure precisely the parent/daughter ion mass values directly from the spectra which appear on chart paper. This is often because there are considerably fewer peaks in these types of spectra compared with a normal mass spectrum obtained from high energy reactions in the ion source. Electronic circuits are described which permit accurate parent/daughter ion mass values to be obtained when the products of metastable decompositions are transmitted through the ZAB-2F double focusing mass spectrometer. Digital logic circuitry is also described which is used to mark mass values during a scan by driving either a solenoid pen drive unit for a chart recorder or a galvanometer on a multi-range ultraviolet oscillograph recorder.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210151104
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  • 8
    Electronic Resource
    Electronic Resource
    Charge stripping reactions of ions formed from methane, ammonia, water and hydrogen sulphide by protonation and by electron impact (1981)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 16 (1981), S. 454-458 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The minimum energy, Qmin, necessary to convert an ion m1+ to a doubly charged ion m12+ is obtained for 19 different ions from methane, ammonia, water and hydrogen sulphide by charge stripping using nitrogen collision gas. The ions studied include the [MH]+ ions formed by chemical ionization in a high pressure source. Stable m12+ ions could not be formed in the case of [NH4]+, [NH]+·, [H2O]+· and [OH]+. Even in these cases the value of Qmin could be estimated by studying the fragments formed from the unstable m2+ ions. In several cases, the energy required to form m12+ ions is less than the literature value for the ionization energy of m1+. This is discussed in terms of the possibility of the presence of excited states of m1+ in the present experiments.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210161008
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  • 9
    Electronic Resource
    Electronic Resource
    The elimination of carbon monoxide from molecular ions of phenol and other [C6H6O]+· isomers (1982)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 17 (1982), S. 81-85 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Phenol and five acyclic isomeric compounds have been investigated using electron impact and field ionization techniques, mass analysed ion kinetic energy spectrometry and collision induced dissociation mass analysed ion kinetic energy spectrometry. The kinetic energy release data corresponding to the elimination of carbon monoxide from the molecular ions show that at least two structures of the reactant ion are involved. The electron impact and field ionization collision induced dissociation mass analysed ion kinetic energy spectra indicate that under electron impact conditions, the phenol ion partially isomerizes to another ion structure. An isomerization of about 40% to the structure of cis-2-hexen-4-yn-1-al is in good accordance with the spectral data.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210170206
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  • 10
    Electronic Resource
    Electronic Resource
    The modern mass spectrometer - a complete chemical laboratory (1981)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 16 (1981), S. 101-114 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Using nitrobenzene as an example, various ways in which a contemporary mass spectrometer can be utilized to yield a wealth of information about the compound studied are reviewed. Applying a variety of different techniques and procedures, in addition to the conventional low resolution mass spectrum, the following nitrobenzene spectra have been obtained: collision induced dissociation mass spectrum, mass analysed ion kinetic energy spectra, collision induced dissociation mass analysed ion kinetic energy spectra, spectra obtained at constant B/E, spectra obtained at constant B2/E, high voltage scans of metastable ion fragmentation processes, consecutive fragmentations in different field free regions, charge exchange mass spectra, charge stripping mass spectra, doubly charged ion mass spectra, chemical ionization mass spectra, negative ion mass spectra, negative ion mass analysed ion kinetic energy spectra, negative ion mass analysed ion kinetic energy collision induced dissociation spectra, charge inversion spectra, etc. The complementary types of information available from the above studies are discussed to show the unique versatility of mass spectrometry as a technique for the examination of organic compounds.
    Additional Material: 32 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210160302
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