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  • Analytical Chemistry and Spectroscopy  (60)
  • INSTRUMENTATION AND PHOTOGRAPHY  (45)
  • Humans
  • 1975-1979  (105)
  • 1977  (105)
  • 1
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    Recent developments in parallel-grid, gas-scintillation proportional counters (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The problems of developing large-area, gas-scintillation proportional counters with high resolution are considered. It is found that simple large-area, parallel-grid proportional counters suffer from a variation in gain over the counter window. Some success has been achieved in overcoming this problem by focusing the charge cloud as it drifts into the multiplication region. Measurements are reported for various mixtures of argon and xenon as well as pure xenon.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
    Electronic Resource
    Electronic Resource
    The measurement of acetanilide in plasma by spectrophotometric and selected ion monitoring methods (1977)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 4 (1977), S. 255-257 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Plasma samples from volunteers who had received an oral dose of acetanilide have been analysed by gas chromatography mass spectrometry and ultraviolet absorption techniques. The gas chromatography mass spectrometry method involved extraction of the plasma and analysis of the acetanilide using selected ion monitoring with a deuterated internal standard. In the ultraviolet method the plasma was hydrolysed with acid to convert the acetanilide to aniline, and this compound was diazotized and coupled with N-1-naphthylethylene-diamine. The absorbance of the resulting complex was read at 550 nm. Acetanilide levels in plasma determined by the selected ion monitoring method were significantly lower than those measured by spectrophotometry. Pharmacokinetic data calculated from the results obtained using these two assays are very different and illustrate the need for an accurate and specific method of analysis. The major metabolites of acetanilide are shown not to interfere with these assays and the results suggest the possible presence of a new metabolite of acetanilide.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200040412
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    In vivo metabolism of cannabinol by the mouse and rat and a comparison with the metabolism of Δ1-tetrahydrocannabinol and cannabidiolAbbreviations: THC = tetrahydrocannabinol; CBD = cannabidiol; CBN = cannabinol. (1977)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 4 (1977), S. 364-370 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The in vivo liver metabolism of cannabinol has been studied in the mouse and rat by combined gas chromatography and mass spectrometry. Cannabinol glucuronide was the major metabolite of cannabinol in the mouse and was accompanied by relatively large amounts of 7-hydroxycannabinol, cannabinol-7-oic acid and their corresponding glucuronide conjugates. Lower concentrations of glucuronides were found in the rat. Two series of disubstituted metabolites were found containing either a 7-hydroxyl or a 7-carboxylic acid group and a second hydroxyl group in the 1″-4″ positions of the sidechain. These were of low concentration in the mouse but higher in the rat; 1″-hydroxy metabolites were particularly abundant in the latter species. Also found in the rat livers were small amounts of sidechain monohydroxy metabolites and larger quantities of 4″,5″-bisnorcannabinol-3″-oic acid; these were absent in the mouse. The metabolites were identified using the trimethylsilyl (TMS),[2H9]TMS and methyl ester-TMS derivatives, and by reduction of acid metabolites with lithium aluminium deuteride to the corresponding alcohols.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200040608
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  • 4
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    Spectral radiance calibrations between 165-300 nm - An interlaboratory comparison (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The spectral radiance of deuterium lamps calibrated by the Max-Planck-Institut fuer Astronomie (MPI), by the U.S. National Bureau of Standards (NBS), and by the Physikalisch-Technische Bundesanstalt (PTB) are compared to check the agreement of UV radiometric scales. The NBS group used the optically thin continuum radiation from a wall-stabilized hydrogen arc as its fundamental radiometric standard, while the MPI and PTB groups used the synchrotron radiation facility in DESY. It is found that the spectral radiance scales based upon the DESY synchrotron and the NBS hydrogen arc are consistent, at least for one wavelength relative to another.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics; 16; July 197
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    NASA TECHNICAL REPORTS
  • 5
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    Digital processing of the Mariner 10 images of Venus and Mercury (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: An extensive effort was devoted to the digital processing of the Mariner 10 images of Venus and Mercury at the Image Processing Laboratory of the Jet Propulsion Laboratory. This effort was designed to optimize the display of the considerable quantity of information contained in the images. Several image restoration, enhancement, and transformation procedures were applied; examples of these techniques are included. A particular task was the construction of large mosaics which characterize the surface of Mercury and the atmospheric structure of Venus.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Journal of Applied Photographic Engineering; 3; Spring 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Development of a drive system for a sequential space camera contract modification 4(S) (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The brush type dc motor and clutch were eliminated from the design of the 16 mm space sequential camera design and replaced by an electronically commutated motor. The new drive system reduces the current consumption at 24 fps to 220 mA. The drive can be programmed and controlled externally from the multipurpose programmable timer/intervalometer, as well as being controlled locally from the camera.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-CR-151342 , SPO-30352
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    DSN water vapor radiometer development: Recent work (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A water vapor radiometer (WVR) was developed which measures the atmospheric noise temperature at two different frequencies. These noise temperatures are used in empirical-theoretical equations which yield tropospheric range delay, in centimeters, through the atmosphere along the beam of the WVR. This range correction is then applied to measurements concerning spacecraft range and to very long baseline interferometry determinations.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: The Deep Space Network; p 71-75
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
    Electronic Resource
    Electronic Resource
    Peptide sequencing: The utility of chemical ionization mass spectrometry (1977)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 4 (1977), S. 159-171 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Chemical ionization mass spectrometry is used at low resolution to determine the sequences of permethylated acetyl peptides. The method has been tested with 45 peptides, between 2 and 5 residues long, including examples of all of the common amino acids except cysteine and N-terminal asparagine. The isobutane chemical ionization spectra contain three principal types of N-terminal sequence ion and one type of C-terminal sequence ion. The redundant information available from these four types of sequence ion increases the reliability of the sequence determination. In prospect, isobutane chemical ionization mass spectrometry seems to be a useful technique for peptide sequence determination, and may have advantages in some cases.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200040308
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  • 9
    Electronic Resource
    Electronic Resource
    High performance liquid chromatographic and mass spectrometric identification of dimethylxanthine metabolites of caffeine in human plasma (1977)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 4 (1977), S. 172-177 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: High performance liquid chromatography and mass spectrometry were used to isolate and identify theophylline, theobromine and 1,7-dimethylxanthine (paraxanthine) in plasma of human volunteers following administration of 300 mg caffeine to methylxanthine-free volunteers. Plasma from these subjects was extracted and the dimethylxanthines were separated from each other and caffeine by high performance liquid chromatography. The effluents at the chromatographic peaks corresponding to the dimethylxanthine metabolites were collected, rechromatographed in a second system and the dried residues were subjected to mass spectrometry. By comparison of their retention times and mass spectra with those of authentic compounds, theophylline, theobromine and paraxanthine were positively identified as metabolic products of caffeine.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200040309
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  • 10
    Electronic Resource
    Electronic Resource
    Organic structural analysis. J. B. Lambert, H. F. Shurvell, L. Berbit, R. G. Cooks, G. H. Stout, Macmillan Publishing Co. Inc., New York, N. Y., 1976. 596 pp. $22.95 (1977)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 4 (1977), S. vii 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200040612
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