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  • 1
    Electronic Resource
    Electronic Resource
    Transforms to enhance correlation of mechanical well logs (1975)
    Springer
    Mathematical geology 7 (1975), S. 323-334 
    Details
    ISSN: 1573-8868
    Keywords: crosscorrelation ; stratigraphy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Mathematics
    Notes: Abstract Mathematical correlation of geologic sections from mechanical well logs depends on comparison of frequency components derived from the recorded amplitude variations of the well logs as they respond to changes in lithology. Techniques have been developed that compensate for changes in thickness of units within lithologic sequences and for moderate numbers of missing and truncated beds. However, accurate correlation depends on time stratigraphic units being composed of relatively consistent sequences of rock lithologic units. Correlation is uncertain in areas where time stratigraphic sequences exhibit considerable facies variation. Visual correlation experiences similar problems but the human eye can sort out facies changes more easily and may be better than mechanical correlation in problem areas. Both mechanical and visual correlation can be enhanced by the application of relatively simple transforms to the basic log data. They are applied by computer to digital logs and are designed to magnify specific diagnostics of the more continuous beds while subduing distracting events and noise. Both mechanical and visual correlation are improved by the use of transformed logs; moreover, the digital logs permit optically pleasing displays that maintain the overall advantage of trained geologists over mechanical intervention.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02081704
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  • 2
    Electronic Resource
    Electronic Resource
    Bacterial adsorption to smooth surfaces: Rate, extent, and spatial pattern (1985)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 27 (1985), S. 1662-1667 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The influence of bulk-water bacterial cell concentration and specific growth rate history on bacterial adsorption rates to surfaces was investigated using response surface analysis. A pure culture of Pseudomonas sp. 224S was grown in a chemostat and pumped into a continuous flow reactor where the bacteria were exposed to clean, glass surfaces under turbulent flow conditions for a period of six hours. Adsorption rate decreased approximately linearly with increasing specific growth rate history. Glass surfaces became saturated with 224S at ca. 0.1% coverage and the resulting spatial pattern of the adsorbed cells deviated from random in the direction of uniformity.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260271206
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  • 3
    Electronic Resource
    Electronic Resource
    Identification of some abnormal haemoglobins by fast atom bombardment mass spectrometry and fast atom bombardment tandem mass spectrometry (1988)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 16 (1988), S. 41-44 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The characterization of two abnormal human haemoglobins by fast atom bombardment (FAB) mapping is presented. The first variant, called ‘R’, exhibits a tryptic FAB map identical to that of normal haemoglobin. However, using Staphylococcus protease V8, a peptide containing the carboxyl end of the β-chain exhibits a mass shift down to 300 mass units. This clearly indicates the deletion of the two last amino acids of the β-chain. The second variant, called ‘Grenoble’, is due to two different modifications of the β-chain. The location of the Pro → Ser exchange on peptide T5 is achieved by the collisionally activated dissociation mass analyzed ion kinetic energy spectra of the corresponding [MH]+ ion. The m/z value of that peptide indicated a supplementary acid → amide modification, which was located by amino acid sequencing using chemical methods. This work concludes with the necessity of using complementary methods for achieving rapid determinations of abnormal proteins with minute amounts.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200160108
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  • 4
    Electronic Resource
    Electronic Resource
    Estimation of nitrogen-15 levels in derivatized amino acids using gas chromatography quadrupole mass spectrometry with chemical ionization and selected ion monitoringAbbreviation: HFBA = heptafluorobutyric anhydride. (1978)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1978), S. 648-653 
    Details
    ISSN: 0306-042X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The data indicate that a commercial, low resolution mass spectrometer can be used with chemical ionization and selected ion monitoring, without a data system, to estimate nitrogen-15 isotopic enrichment with a sensitivity and precision adequate for many biological studies. This was demonstrated using derivatized amino acid mixtures with separation and direct introduction into the mass spectrometer via a gas chromatograph. The method can discriminate between mean levels separated by 0.1 atom % 15N with 68% confidence at the 0.1 nmol level. Labeled dansylamide samples, inserted by probe, were also measured for 15N content.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200051203
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  • 5
    Electronic Resource
    Electronic Resource
    The reactions of the ions [XC]+, [X2C]+·, [X3C]+· and [X4C]+· (where X = H or F) with ethene and propene (1987)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 22 (1987), S. 154-156 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The reaction of C1 ions with ethene and propene has been studied in the gas phase using a triple quadrupole mass spectrometer.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210220307
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