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  • 1975-1979  (7)
  • 1900-1904
  • 1978  (3)
  • 1976  (4)
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  • 1975-1979  (7)
  • 1900-1904
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Synthesis of novel bis(amides) by means of triphenyl phosphite intermediates (1978)
    s.l. : American Chemical Society
    Journal of chemical & engineering data 23 (1978), S. 349-350 
    Details
    ISSN: 1520-5134
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/je60079a006
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Coronal temperatures and temperature gradients from OSO-7 spectroheliograms (1976)
    Springer
    Solar physics 47 (1976), S. 611-626 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Temperatures and temperature gradients for the outer corona are obtained from brightness gradients of EUV lines that were measured with the spectroheliograph on OSO-7. Brightness gradients show considerable deviations from isothermal model calculations that include collisional excitation and photoexcitation. A negative temperature gradient that gives both positive and negative ion abundance gradients appears to be able to account for the discrepancy. For λ284 of Fe xv, perhaps the strongest line from the outer corona, measurements during 1972 appear to be consistent with (i) a temperature near 2.3×106K near the equator at ϱ = 1.3±0.1 solar radii from the solar center; (ii) (ϱ/T) dT/dϱ values near -0.7 that extend from as low as ϱ = 1.2 to about ϱ = 1.8. Temperatures from strong lines of Fe xiv and Fe xvi indicate that variations of about ±0.2×106K exist along lines of sight where emission is appreciable. There appears to be some agreement between these results and temperature measurements from ion abundances in the solar wind and Doppler width of λ5303.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00154770
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Occurrence of trans -ribosylzeatin in Agrobacterium tumefaciens tRNA (1976)
    [s.l.] : Nature Publishing Group
    Nature 262 (1976), S. 153-154 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Four strains of A. tumefaciens were examined. Two strains, IIBV7 and C-58, are virulent and have been shown to harbour a large plasmid which is associated in some way with virulence8. The other two strains IIBNV6 and NT1, are avirulent and do not contain the plasmid. Strains C-58 and NT1 are very ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/262153a0
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Trace enrichment of cytokinins from Douglas-fir xylem extrudate (1976)
    Springer
    Planta 131 (1976), S. 271-274 
    Details
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Quantitative trace-enrichment of cytokinins from a plant source (xylem sap from the Douglasfir, Pseudotsuga menziesii (Mirb.) Franco) has been achieved by adsorption onto octadecyl-silica columns followed by elution with ethanol. Adsorption is rapid and efficient and allows complete recovery of cytokinins at the nanomolar level. Douglas-fir sap contains at least four compounds having cytokinin activity, one of which co-elutes with zeatin and another with ribosylzeatin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00385425
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Ulcerative colitis in association with Takayasu's disease (1978)
    Springer
    Digestive diseases and sciences 23 (1978), S. 660-662 
    Details
    ISSN: 1573-2568
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01072601
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Evaluation of some statistical methods of interpreting multi-element geochemical drainage data from New Brunswick (1978)
    Springer
    Mathematical geology 10 (1978), S. 195-224 
    Details
    ISSN: 1573-8868
    Keywords: geochemical exploration ; multivariate analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Mathematics
    Notes: Abstract Univariate and multivariate statistical methods were evaluated using published multi-element stream sediment data from southwestern and northern New Brunswick. The statistical distributions of elements do not obey Ahrens' “law of lognormality”; eleven of thirteen elements investigated for the Bathurst-Jacquet River area are not lognormally distributed at the 0.05 level of significance. The distributions are positively skewed and leptokurtic and consist of aggregate populations which represent mineral deposits, bedrock, and many other physiographic factors; some of these populations are normally distributed. The efficiency of the Pearson correlation coefficient varied and was compared to nonparametric correlation. Various methods of factor analysis were evaluated and the structure of the factors was similar to the subjective groupings derived from the correlation matrices. Comparison of correlation coefficients and factor models derived from the log-transformed and untransformed Bathurst-Jacquet River data showed that background associations were enhanced by the log transformation at the expense of associations representing mineralization. Q-mode factor matrices could not be satisfactorily interpreted without recourse to the mapping of the factor loadings. The maps produced were inferior to simple concentration maps. An iterative technique was developed for discriminant analysis to refine the sample training groups representing mineralized and background terrain; repeated discriminant analysis after misclassified samples were eliminated altered the inherent character of the training groups. Trend surface analysis was found to give goodness of fits of the trend equations comparable to the fits expected from random numbers. The method was mathematically inappropriate for the type of data used. The goal of exploration geochemical statistical analysis should be to discriminate and sort populations representing mineralized and background populations by classification or filtering techniques.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01032864
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Letter to the editor (1976)
    Springer
    Mathematical geology 8 (1976), S. 209-214 
    Details
    ISSN: 1573-8868
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01079036
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    Paper (German National Licenses)
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