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  • Articles  (23)
  • Analytical Chemistry and Spectroscopy  (22)
  • 17-hydroxycorticosteroids
  • 1990-1994  (14)
  • 1970-1974  (9)
  • 1
    Electronic Resource
    Electronic Resource
    Cortisol metabolism in monkeys (1974)
    Springer
    Bulletin of experimental biology and medicine 78 (1974), S. 1019-1020 
    Details
    ISSN: 1573-8221
    Keywords: cortisone ; hormone metabolism ; 17-hydroxycorticosteroids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The content of the various fractions of 17-hydroxycorticosteroids in the urine of healthy monkeys (Macaca rhesus) was studied by adsorption chromatography in a thin layer of kieselguhr. Besides cortisol, which accounts for about 20–25% of the total quantity of metabolites determined, cortisone, tetrahydrocortisol, tetrahydrocortisone and, in some cases, 11-deoxycorticosterone, 17-hydroxy-11-deoxycorticosterone, and its tetrahydro metabolite, were found. Age differences in the character of cortisol metabolism were discovered in the monkeys.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00796654
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  • 2
    Electronic Resource
    Electronic Resource
    Peptide sequencing by partial acid hydrolysis and high resolution plasma desorption mass spectrometry (1994)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 8 (1994), S. 906-912 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: A method of deriving peptide sequence information using partial acid hydrolysis in combination with accurate mass measurements and immonium ion analysis provided by high-resolution plasma desorption mass spectrometry has been developed. The technique is very simple in terms of the chemistry and involves a short-time (3-30 min) incubation of the peptide in 1N-6N HCl at 100-110°C with subsequent mass spectrometric analysis. Partial acid hydrolysis is found to produce sequence-specific segments, often ladder-like, although not always a complete set. Two application examples of the method are given: the linear peptide bradykinin and desmopressin, a peptide with an internal S—S bond and a non-amino-acid constituent. The technique has proved to be particularly useful in cases where some a priori information on the peptide structure was already known or where the automated Edman degradation technique might yield erratic results or not work at all.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290081109
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  • 3
    Electronic Resource
    Electronic Resource
    Formulation of a universal electron probe microanalysis correction method (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 21 (1992), S. 27-35 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: A new correction method for obtaining quantitative electron probe microanalysis results is described. It utilizes data provided by Monte Carlo simulations and tracer measurements to obtain a detailed picture of the way in which the x-ray emission process is influenced by the relevant experimental parameters. Then empirical equations are derived which model the intensity of x-ray emission for an extremely wide range of experimental conditions, encompassing electron beam energies from 5 to 40 keV, characteristic x-ray wavelengths from 11.4 to 0.08 nm, angles of electron incidence from 90° to 40° and elements ranging from beryllium to uranium in the Periodic Table. The method treats separately, as with the traditional approach, the effects of atomic number difference in specimen and standard, x-ray absorption and x-ray fluorescence. The correction method was tested on an extensive range of microanalysis data and shown to work well under all conditions, providing chemical compositions which are accutate to within a few percent relative. The capability of handling ultra-light element (beryllium to sodium) analysis is particularly impressive and the r.m.s. error of 3.8% for carbon analysis on carbides is very close to the errors incurred in measuring actual x-ray intensities. The correction program is currently being developed for commercial use on IBM-compatible computers and the final stage in the evolution of the universal correction will be to extend it to deal with the analysis of thin surface films.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300210109
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  • 4
    Electronic Resource
    Electronic Resource
    Infrared and Raman spectra of the spinel ZnGa2O4 (1973)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 1 (1973), S. 513-519 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A study of the infrared and Raman spectra of single crystals and powders of ZnGa2O4 yields the following k = 0 phonon frequencies: 175 cm-1 (T1u), 328 cm-1 (T1u), 420 cm-1 (T1u), 570 cm-1 (T1u), 467 cm-1 (T2g), 611 cm-1 (T2g), 638 cm -1 (Eg) and 714 cm-1 (A1g).The results are compared with the frequencies of the vibronic sidebands of the Cr3+ R line emission as observed in ZnGa2O4: Cr3+. It is found that the strogest vibronics of the R lines are due to coupling of the Cr3+ electrons with the T1u modes of the ZnGa2O4 lattice, especially with the two higher frequency T1u modes.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250010510
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  • 5
    Electronic Resource
    Electronic Resource
    Light scattering from polaritons in m-dinitrobenzene single crystal (1974)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 2 (1974), S. 493-495 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Raman scattering from polaritons in organic biaxial crystal m-dinitrobenzene has been observed by a photographic method. In order to obtain a greater shift of polaritons the directional dispersion of the incident wave vector has been taken into account, so that the polariton disperison curves over the range from 500 cm-1 to 3500 cm-1 have been observed.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250020505
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  • 6
    Electronic Resource
    Electronic Resource
    Spectroscopic studies of Lewis acid-base complexes. III: Vibrational frequencies, assignments and normal coordinate analyses for isotopic varieties of phosphine borane and trifluorophosphine borane (1974)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 2 (1974), S. 175-192 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Vibrational spectra of the two Lewis complexes, phosphine borane, PH3BH3, and trifluoro-phosphine borane, PF3BH3, have been investigated for several isotopic species preserving C3v symmetry. New assignments are proposed and substantiated by normal coordinate analyses formulated in the compliance constant basis.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250020208
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  • 7
    Electronic Resource
    Electronic Resource
    Novel aryloxy migrations in substituted diphenyldithiocarbonates under electron impact conditions (1993)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 28 (1993), S. 459-462 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Unusual expulsion of ‘SO’ was observed from the molecular ions of substituted diphenyldithiocarbonates under electron impact conditions. An initial aryloxy migration to sulphur followed by further rearrangement is proposed for this process, based on the substituent effects. The diarylthioketone radical-cation structure assigned for the [M - SO] ion was confirmed through the collision-activated dissociation B/E linked-scan spectra.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210280433
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  • 8
    Electronic Resource
    Electronic Resource
    Measurements of L1, Lα, Lβ and Lγ x-ray fluorescence cross-sections in heavy elements excited by 36.62, 43.69, 48.30, 50.20 and 53.50 keV photons (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 22 (1993), S. 401-405 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: L1, Lα, Lβ and Lγ x-ray fluorescence cross-sections were measured in Au and Pb at excitation energies of 36.62, 43.69, 48.30, 50.20 and 53.50 keV. Measurements were made using an x-ray tube with a secondary exciter system as the excitation source. The x-ray tube with a secondary target arrangement was used to obtain high intensity with a high degree of monochromatization. By using an x-ray tube it is possible to measure L x-ray fluorescence cross-sections even for low-intensity x-rays (L1). The experimental results were compared with the theoretically calculated values of L x-ray fluorescence cross-sections and a fairly good correspondence was observed.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300220606
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  • 9
    Electronic Resource
    Electronic Resource
    Photon-excited K x-ray fluorescence cross-sections for some light elements in the energy range 20-60 keV (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 22 (1993), S. 406-409 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Kα and Kβ x-ray fluorescence cross-sections were experimentally determined for elements in the range 26 ≤ Z ≤ 40 at various excitation energies using and x-ray tube with a secondary exciter system as the excitation source. The x-ray tube with a secondary target arrangement was used to obtain high intensity with a high degree of monochromatization. Experimental values were compared with the theoretical values calculated using IKβ/IKα ratios based on Hartree - Fock and Hartree - Slater theories. The experimental values for all the elements at various excitation energies were in good agreement with the theoretical values.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300220607
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  • 10
    Electronic Resource
    Electronic Resource
    Mass spectra of chloro-substituted benzophenones (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 605-613 
    Details
    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 all three monochloro-, seven of the dichloro- and two of the trichloro-substituted benzophenones are reported. The major fragments in the spectra are due to α-fission to oxonium ions followed by the well-known subsequent fragmentations. The ring bearing the greater number of chlorine atoms appears to cleave more readily, with 2-chloro substituents enhancing this tendency. There is evidence for the formation of the biphenylene ion in all monochloro and all dichloro compounds studied and for the formation of the chloro biphenylene ion in both trichloro compounds studied. In the case of 2,2′-, 2,4- and 3,4-dichlorobenzophenones evidence exists for hydrogen transfer between rings.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210050511
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