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  • Analytical Chemistry and Spectroscopy  (3)
  • GEOPHYSICS  (2)
  • 2005-2009
  • 1985-1989  (5)
  • 1945-1949
Collection
Keywords
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Positive ion fast atom bombardment mass spectrometry of reductively pyridylaminated maltooligosaccharides and its application to α-amylase assay (1988)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 15 (1988), S. 233-237 
    Details
    ISSN: 0887-6134
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Positive ion fast atom bombardment mass spectra of maltooligosaccharides reductively aminated with 2-aminopyridine (Gn-AP) contain abundant [M + H]+ ions. Determination of G2-AP and G3-AP produced from G5-AP by the action of α-amylases, based on the abundance of their [M + H]+ ions relative to that of cellobiose reductively aminated with 2-amino-6-methylpyridine as the internal standard, allowed rapid and reproducible assay of these enzymes. It was advantageous for clinical investigation that the proportion of pancreatic and salivary α-amylase activities could be determined.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200150408
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Studies of 13C NMR spectra of 13C-enriched cycloartenol biosynthesized from [1-13C]-, [2-13C]-and [1,2-13C2]-acetate. Revised 13C NMR spectral assignments of cycloartenol and cycloartanol and 13C NMR spectral support for the generally accepted skeleton formation mechanism of cycloartenol (1987)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 25 (1987), S. 683-687 
    Details
    ISSN: 0749-1581
    Keywords: 13C-enrichment ; 13C NMR ; spectral assignment ; Cycloartanol ; Cycloartanol ; Skeleton formation mechanism ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Previously proposed 13C NMR spectral assignments of cycloartenol (9,19-cyclolanost-24-en-3β-ol) (1) and cycloartanol (9,19-cyclolanostan-3β-3-ol) (2) were re-examined by means of 13C-enrichment experiments and LIS measurement of 13C chemical shifts. Revised signal assignments are proposed for C-7, C-11, C-16, C-18, C-21 and C-28 of 1 and C-7, C-11, C-12, C-15 and C-16 of 2. Experimental proof for the skeleton formation mechanism of 1 based on 13C NMR spectral findings is presented.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260250806
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Conformations of bryonolic acid and its derivatives in CDCl3 solution by 1H and 13C NMR spectroscopy (1987)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 25 (1987), S. 848-855 
    Details
    ISSN: 0749-1581
    Keywords: Conformation ; D:C-friedoolean-8-enes ; Molecular mechanics calculation ; 1H and 13C NMR ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Comparison of the 1H and 13C chemical shift data of bryonolic acid (D : C-friedoolean-8-en-3β-ol-29-oic acid) and its derivatives (13 species) revealed that the conformational features of these compounds in CDCl3 solution depend on whether the functional groups at C-29 are trigonal, such as COOCH3, or tetrahedral, such as CH2OH. In order to study the conformational features of these two groups of compounds, vicinal coupling constants between the protons on the E rings of the methyl ester of D : C-friedoolean-8-en-29-oic acid, D : C-friedoolean-8-en-29-oic and its acetate were measured. Comparison of the results with the steric geometries to be expected from the molecular mechanics calculation for the E-ring moieties of these derivatives in the S form (D-E rings: boat-boat form) and the F form (D-E rings: chair-chair form) led to the conclusion that the compounds having a trigonal functional group at C-29 mainly adopt the S form, and those having a tetrahedral functional group at C-29 are present as mixtures of the S and F form in equilibrium in the solutions.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260251004
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  • 4
    facet.materialart.
    Unknown
    Measurements of concentrations of chlorofluoromethanes (CFMs) carbon dioxide and carbon isotope ratio in stratospheric and tropospheric air by grab-sampling systems (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Measurements of concentrations of chlorofluoromethanes (CFMs), carbon dioxide and carbon isotope ratio in stratospheric and tropospheric air by grab-sampling systems are reported. The balloon-borne grab-sampling system has been launched from Sanriku Balloon Center three times since 1981. It consists of: (1) six sampling cylinders, (2) eight motor driven values, (3) control and monitor circuits, and (4) pressurized housing. Particular consideration is paid to the problem of contamination. Strict requirements are placed on the choice of materials and components, construction methods, cleaning techniques, vacuum integrity, and sampling procedures. An aluminum pressurized housing and a 4-m long inlet line are employed to prevent the sampling air from contamination by outgassing of sampling and control devices. The sampling is performed during the descent of the system. Vertical profiles of mixing ratios of CF2Cl2, CFCl3 and CH4 are given. Mixing ratios of CF2Cl2 and CFCl3 in the stratosphere do not show the discernible effect of the increase of those in the ground level background, and decrease with altitude. Decreasing rate of CFCl3 is larger than that of CF2Cl2. CH4 mixing ratio, on the other hand, shows diffusive equilibrium, as the photodissociation cross section of CH4 is small and concentrations of OH radical and 0(sup I D) are low.
    Keywords: GEOPHYSICS
    Type: International Council of Scientific Unions Handbook for MAP, Vol. 18; 7 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
    facet.materialart.
    Unknown
    Noble gases in diamonds - Occurrences of solarlike helium and neon (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Seventeen diamond samples from diverse locations were analyzed for the contents of He, Ar, Kr, and Xe, and of their isotopes, using a Reynolds (1956) type glass mass spectrometer. The results disclosed a large spread in the He-3/He-4 ratios, ranging from values below atmospheric to close to the solar ratio. In particular, solarlike He-3/He-4 ratios were seen for an Australian colorless diamond composite and an Arkansas diamond, which also displayed solarlike neon isotopic ratios. Wide variation was also observed in the He-4/Ar-40 ratios, suggesting a complex history for the source regions and the diamond crystallization processes.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 92; 12507-12
    Format: text
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    NASA TECHNICAL REPORTS
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