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  • Analytical Chemistry and Spectroscopy  (107)
  • LUNAR AND PLANETARY EXPLORATION  (103)
  • SPACE SCIENCES
  • 1990-1994  (210)
  • 1975-1979
  • 1970-1974
  • 1990  (210)
Collection
Keywords
Publisher
Years
  • 1990-1994  (210)
  • 1975-1979
  • 1970-1974
Year
  • 1
    Electronic Resource
    Electronic Resource
    Discrimination effects in inorganic ion-cluster detection by secondary-electron multiplier in mass spectrometry experiments (1990)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 4 (1990), S. 9-12 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Discrimination effects in secondary electron multipliers due to the differences in kinetic energy with which ions of different masses strike the dynode surface are investigated. The threshold energy at which ions of a particular mass can be detected is discussed. The efficiencies of such multipliers when used with cluster ions such as H+(H2O)N (where Cat+ represents an alkali-metal cation) are investigated and discussed, in terms of both the ‘kinetic’ and ‘potential’ emission coefficients.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290040104
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Abnormal effects in the detection of ions from bioorganic substances by mass spectrometry (1990)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 4 (1990), S. 13-15 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The characteristics of the detection of ions of the alkali metals and of cluster ions of the type (H2O)NMH+ (where M is an amino acid) are markedly different from those for the detection of protonated saccharose ions. The latter are shown to produce a signal from a secondary electron multiplier detector at a lower ion energy than the threshold energy for the former ions. An explanation is proposed in terms of the charge localization.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290040105
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    Paper (German National Licenses)
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  • 3
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    Voyager photopolarimeter observations of Uranian ring occultations (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Occultation profiles have been derived from Voyager 2 photopolarimeter observations of the nine pre-Voyager Uranian rings as well as of 1986U1R. The epsilon ring, which is the broadest and most massive, is noted to possess a wealth of structure which appears to persist coherently around the ring. The photopolarimeter data do not show any features globally ascribable to all the rings observed. Results are presented from a statistical analysis of photopolarimeter data for previously undetected or partial ring arcs.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus (ISSN 0019-1035); 83; 102-125
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
    Electronic Resource
    Electronic Resource
    Separation of metal complexes by on-line coupled LC-GC (1990)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 13 (1990), S. 170-172 
    Details
    ISSN: 0935-6304
    Keywords: Liquid chromatography ; Gas chromatography ; LC/GC ; On-line coupling ; Metal complexes ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The on-line coupled LC-GC technique was applied to the analysis of several metal chelates of N,N-diethyldithiocarbamic acid. A 10-port valve interface was used to couple the LC and GC instruments. Conditions during sample transfer into the GC gave fully concurrent solvent evaporation. The chelates investigated were separated with a short apolar fused silica column. LC preseparation was made with cyano or amino phases using a hexane/dichloromethane mixture as eluent. On-line LC-GC combination seems to be very suitable for the separation of the metal chelates studied.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240130306
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  • 5
    Electronic Resource
    Electronic Resource
    Fast-Atom bombardment mass spectrometry and collisional spectroscopy in the structural characterization of underivatized 1,4-benzodiazepines (1990)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 4 (1990), S. 314-317 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Fast-atom bombardment (FAB) mass spectrometry linked with collision spectroscopy has been employed for the structural characterization of eight underivatized 1,4-benzodiazepines. Both positive- and negative-ion FAB led, in all cases examined, to the production of abundant molecular species. Collision experiments performed on such ions gave rise to the identification of diagnostic fragment ions, that could be related to the original structure.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290040904
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  • 6
    Electronic Resource
    Electronic Resource
    Stable isotope dilution analysis of 4-hydroxybutyric acid: An accurate method for quantification in physiological fluids and the prenatal diagnosis of 4-hydroxybutyric aciduria (1990)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 19 (1990), S. 89-93 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A quantitative assay for 4-hydroxybutyric acid was developed using D6-4-hydroxybutyric acid as an internal standard. 4-Hydroxybutyric acid was isolated by liquid chromatography and the amount quantified by selected ion monitoring, ammonia chemical ionization gas chromatography/mass spectrometry of the trimethylsilyl derivatives. The concentrations of 4-hydroxybutyric in control physiological fluids were: 2.64 ± 3.46 mmol mol-1 creatinine in urine, 1.09 ± 2.87 μmol l-1 in plasma, 0.98 ± 1.17 μmol l-1 in cerebrospinal fluid and 1.28 ± 0.47 μmol l-1 in amniotic fluid. The concentration of 4-hydroxybutyric acid in the amniotic fluid from a pregnancy at risk for 4-hydroxybutyric aciduria was 2.30 μmol l-1, indicating an unaffected fetus. The stable isotope dilution assay of 4-hydroxybutyric acid in physiological fluid samples is a rapid, sensitive and accurate method for quantification, as well as a valuable technique for the prenatal diagnosis of 4-hydroxybutyric aciduria.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200190207
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  • 7
    Electronic Resource
    Electronic Resource
    Structure determination of O-linked glycopeptides by tandem mass spectrometry (1990)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 19 (1990), S. 777-781 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A new method for characterizing O-linked glycopeptides without chemical degradation is presented. Collisioninduced dissociation (CID) analysis of intact O-linked glycopeptides containing mono-and disaccharides was performed. For glycopeptides containing one hexose unit, both the peptide sequence and the site of attachment of the sugar moiety were obtained from a single high-energy CID spectrum. However, in a glycopeptide bearing multiple sugar residues per site, the CID spectrum was dominated by fragments resulting from cleavages of the carbohydrate substituents and the gas-phase deglycosylated peptide, thus obviating the concomitant observation of peptide sequence ions. Hence, information on the structures of the carbohydrate substituents was obtained, but not on the sites of attachment of these residues to the peptide. Subsequent CID analysis of the gas-phase deglycosylated peptide ion can be used to obtain the sequence of the peptide backbone from the same sample. This method holds promise for simultaneously determining the carbohydrate structure and the peptide sequence of intact O-linked glycopeptides without chemical degradation.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200191205
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  • 8
    Electronic Resource
    Electronic Resource
    Electron spin resonance study of spin-trapped radicals from gamma irradiation of glucose oligomers (1990)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 28 (1990), S. 594-600 
    Details
    ISSN: 0749-1581
    Keywords: ESR ; Gamma irradiation ; Glucose ; Glucopyranose ; Glucopyranosyl ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Radicals produced in aqueous solution by gamma irradiation of the five first glucose oligomers were trapped using 2-methyl-2-nitrosopropane (MNP) and separated by high-performance liquid chromatography. The electron spin resonance (ESR) spectra were analysed on a microcomputer with a general interactive simulation program (VOYONS). The ESR coupling constants of five radical adducts, which were found in all the oligomers, are reported. A comparison with the coupling constants previously obtained from α-D-glucopyranosyl,-0-methyl-α-D-glucopyranose, O-α-D-glucopyranosyl-(1 →4)-α-D-glucopyranose or polyols, irradiated in the liquid phase or in the powder state, provides new information on the chemical structures of the radicals radioinduced in glucose oligomers. As the powder ESR spectra and the main radiolytic products from the gamma-irradiated oligomers have been found to be comparable to those from irradiated starches, this work is the first step in the elucidation of the radiolysis mechanism of starch.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260280707
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  • 9
    Electronic Resource
    Electronic Resource
    Fluorine NMR spectra of some 9α-fluorosteroids (1990)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 28 (1990), S. 414-418 
    Details
    ISSN: 0749-1581
    Keywords: 19F spectroscopy ; 9α-Fluorosteroids ; Proton-fluorine coupling ; Vicinal shielding effects ; Remote deshielding effects ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Fluorine NMR spectra of 23 9α-fluorocorticosteroid analogs established that the 9α-fluorine is subject to deshielding effects by remote structural features (A-ring olefinic unsaturation, A-ring 1α- and 2β-hydroxy and acetoxy features and D-ring 16α-methyl substitution) and to minor shielding effects by vicinal 11β-alcohol dehydrogenation and acetylation, and by B-ring olefinic unsaturation. Substitutions in the 6α-, 6β-, 16α- and 16β-positions and D-ring homoannulation do not alter the 19F chemical shift significantly. Coupling constants of the 9α-fluorine to vicinal 8β- and 11α-hydrogens are not altered appreciably by structural changes, except for introduction of a Δ6-double bond or 11β-alcohol dehydrogenation, indicating that the conformations of the tetracyclic ring system and particularly the B/C-ring junction were very similar for these 9α-fluorosteroids.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260280506
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  • 10
    Electronic Resource
    Electronic Resource
    13C NMR analysis of sultones and sulphonate-sulphate anhydrides (1990)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 28 (1990), S. 998-1002 
    Details
    ISSN: 0749-1581
    Keywords: 13C NMR ; Sultones ; Sulphonate-sulphate anhydrides ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 13C NMR spectra of 20 compounds belonging to several types of monocyclic sultones and related ‘carbyl sulphates,’ including a series of fluorinated β-sultones (1,2-oxathietane 2,2-dioxides), are reported. Chemical shift increment systems with n-alkanes as reference molecules are established for non-fluorinated sultones: they show a much less pronounced deshielding effect on the carbon α to oxygen in β-sultones than in the other series. Chemical shifts for the parent β-sultone, predicted in two ways (linear or cyclic model compound), are found to be almost consistent with a purely additive scheme. In fluorinated β-sultones the α-substituent increments relative to perfluoroethanesultone are also derived.
    Additional Material: 8 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260281116
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