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  • Digitale Medien  (25)
  • 1975-1979  (15)
  • 1960-1964  (6)
  • 1930-1934  (2)
  • 1900-1904  (2)
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  • Digitale Medien  (25)
Erscheinungszeitraum
Jahr
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  • 11
    Digitale Medien
    Digitale Medien
    Lability of the Action Potential and the Recovery Cycle from Isolated Motor Axons of the Crab, Carcinus (1964)
    [s.l.] : Nature Publishing Group
    Nature 203 (1964), S. 872-873 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Fig. 1. Tracings from original records illustrating the modification of the form of the action potential when anodal current (dashed line), and cathodal current (solid line) are applied during the repolarization phase. The normal course of repolarization is shown by the fine solid line. Action ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/203872a0
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  • 12
    Digitale Medien
    Digitale Medien
    A Simple Form of Tide Predictor (1903)
    [s.l.] : Nature Publishing Group
    Nature 68 (1903), S. 322-322 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] FOR the past four years a very simple form of tide-predicting machine, the invention of Captain A. Inglis, the harbour-master, has been in use at Port Adelaide for the construction of the yearly published tide tables. The tides at Port Adelaide are rather peculiar in their behaviour, this being ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/068322a0
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  • 13
    Digitale Medien
    Digitale Medien
    Tides at Port Darwin (1903)
    [s.l.] : Nature Publishing Group
    Nature 68 (1903), S. 295-295 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] ALONG the north-west coast of Australia the tidal wave, flowing in from the Indian Ocean, produces at most places a large rise and fall. At Port Darwin the mean spring range is about 24 feet, but the range is sometimes as much as 30 feet. A tide gauge of Lord Kelvin's pattern was set up here by ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/068295b0
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  • 14
    Digitale Medien
    Digitale Medien
    Trace enrichment of cytokinins from Douglas-fir xylem extrudate (1976)
    Springer
    Planta 131 (1976), S. 271-274 
    Details
    ISSN: 1432-2048
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00385425
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  • 15
    Digitale Medien
    Digitale Medien
    Ulcerative colitis in association with Takayasu's disease (1978)
    Springer
    Digestive diseases and sciences 23 (1978), S. 660-662 
    Details
    ISSN: 1573-2568
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01072601
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  • 16
    Digitale Medien
    Digitale Medien
    Indikatoren (1933)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 93 (1933), S. 454-457 
    Details
    ISSN: 1618-2650
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01393128
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  • 17
    Digitale Medien
    Digitale Medien
    Besondere Indikatoren (1934)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 97 (1934), S. 203-205 
    Details
    ISSN: 1618-2650
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01370555
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  • 18
    Digitale Medien
    Digitale Medien
    Letter to the editor (1976)
    Springer
    Mathematical geology 8 (1976), S. 209-214 
    Details
    ISSN: 1573-8868
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Mathematik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01079036
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  • 19
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): geochemical exploration ; multivariate analysis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Mathematik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01032864
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  • 20
    Digitale Medien
    Digitale Medien
    Exploration geochemistry—Distribution of elements and recognition of anomalies (1975)
    Springer
    Mathematical geology 7 (1975), S. 415-446 
    Details
    ISSN: 1573-8868
    Schlagwort(e): data processing ; discriminant analysis ; graphics ; mapping ; sampling ; simulation ; geochemistry
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Mathematik
    Notizen: Abstract The exploration geochemist faces a serious problem in reconciling theoretical statistics with the empirical distribution of elements in materials in the earth's crust. The results of computer-simulation experiments being conducted by the Exploration Geochemistry Group at the University of New Brunswick illustrate some of the problems of the relation between frequency distributions and spatial distributions of elements and raise some interesting questions about sampling patterns and physical size of samples. Most importantly, the simulation experiments and empirical examples support the contention that attempts to make an assumption of normality more efficient by performing log transformations on positively skewed data may defeat the purpose of statistical analysis for exploration work. New developments in computer-data presentation and interpretation, including population sorting and classification, illustrate the increasing use of the computer in exploration geochemistry.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02080498
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