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  • Analytical Chemistry and Spectroscopy  (12)
  • Isozymes  (2)
  • 1
    Digitale Medien
    Digitale Medien
    Chromosomal location of structural genes controlling isozymes in Hordeum chilense (1987)
    Springer
    Theoretical and applied genetics 73 (1987), S. 433-439 
    Details
    ISSN: 1432-2242
    Schlagwort(e): Hordeum chilense ; Tritordeum ; C-banding ; 6-phosphogluconate dehydrogenase ; Malate dehydrogenase ; Isozymes ; Isozyme markers
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary A study of 6-phosphogluconate dehydrogenase and malate dehydrogenase isozyme expression in Triticum turgidum conv. durum /Hordeum chilense monosomic addition lines has revealed the location of two structural genes, 6-pgd-H ch 2 and Mdh-H ch 1, on chromosome 1Hch of H. chilense. The homoeology between 1Hch and other chromosome of Triticeae related species is discussed on the basis of isozyme gene analysis.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00262512
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  • 2
    Digitale Medien
    Digitale Medien
    Chromosomal location of structural genes controlling isozymes in Hordeum chilense (1987)
    Springer
    Theoretical and applied genetics 73 (1987), S. 690-698 
    Details
    ISSN: 1432-2242
    Schlagwort(e): Hordeum chilense ; Tritordeum ; Esterases ; Glutamate oxaloacetate transaminase ; Phosphoglucomutase ; Isozymes
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Polyacrylamide and starch gel electrophoresis of esterase (EST), glutamate oxaloacetate transaminase (GOT) and phosphoglucomutase (PGM) isozymes in Hordeum chilense, Triticum turgidum conv. durum, the amphiploid H. chilense X T. turgidum (Tritordeum), and the durum wheat/H. chilense monosomic addition lines revealed the chromosomal location of one EST locus, two GOT loci and one PGM locus. Loci Est-H ch1 and Got-H ch2 were found on chromosome 6Hch,Got-H ch3 on chromosome 3Hch, and Pgm-H ch1 on chromosome 4Hch. These results lend evidence for the assumed homoeology relationships between chromosomes of Triticeae species.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00260777
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  • 3
    Digitale Medien
    Digitale Medien
    EDXRF procedure for quantitative analysis matching theoretically generated reference spectra to measured spectraPresented at the European Conference on EDXRS, Budapest, Hungary, 30 May-3 June 1994. (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 24 (1995), S. 277-282 
    Details
    ISSN: 0049-8246
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Physik
    Notizen: The diversity of processes that contribute to an x-ray fluorescence spectrum make it difficult to obtain an accurate estimate of the line intensities needed to determine the sample composition in XRF analysis. The radiative contributions forming the spectrum are produced by the interactions that x-ray photons undergo with the atoms of the sample. Many multiple scattering terms contribute to the continuous portions of spectrum that overlap the lines of interest. The lines themselves are formed by the overlap of many narrow (discrete) contributions and some continuous ones: one ‘primary intensity’ plus several enhancement terms. The lines can also interfere with other neighbouring lines produced in the sample. The resulting spectrum, sufficiently complicated at this stage, is still modified in a complex way by the influence of the detector response and successive digitalization by the multi-channel analyser. The difficulties that such spectral complexity introduces in the process of extracting the ‘primary fluorescence intensity’ from the experimental spectrum can be overcome by using a theoretical spectrum of reference that, in this paper, was calculated using the code SHAPE. Such a theoretical spectrum has the property that all the single contributions are well known, and therefore can be used to estimate correctly the fraction of ‘primary fluorescence intensity’ under any experimental line of interest in the real spectrum enclosed between two given energy channels. Since the theoretical spectrum can be computed only for a known composition, the calculated fraction can be initially obtained by feeding SHAPE with an arbitrary composition. The fraction estimated with the theoretical spectrum is used to correct the corresponding peak area in the experimental measured spectrum, which in turn is used to obtain a new calculated composition. This result is used to feed a new spectrum computation, defining an iterative method that converges to the unknown composition. The theoretical details of this iterative method are described and some experimental examples of EDXRF analysis using this technique are given. The advantages of the method for treating some paradigmatic cases of analysis are also illustrated.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/xrs.1300240602
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  • 4
    Digitale Medien
    Digitale Medien
    A theoretical procedure to determine coefficients from the Rasberry-Heinrich calibration curve in XRF spectroscopy (1981)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 10 (1981), S. 74-77 
    Details
    ISSN: 0049-8246
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Physik
    Notizen: Relative X-ray fluorescent intensity data have been generated numerically for binary samples under mono-chromatic excitation in those cases of absorption plus enhancement that are dealt with in this work. These data were fitted to the empirical Rasberry-Heinrich equation, keeping both coefficients different from zero, since from our numerical calculations it is shown that in most cases the best fit is achieved when A ≠ 0. Furthermore, this approach shows that a third coefficient introduced into the empirical equation improves the fitting. The aforementioned results suggest that the empirical equation could be deduced from the theoretical equation of fundamental parameters under suitable approximation. The result is an equation similar to that of Rasberry and Heinrich, from which analytical approximated coefficients are obtained. It is then possible to calculate a calibration curve using fundamental parameters values.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/xrs.1300100208
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  • 5
    Digitale Medien
    Digitale Medien
    Thin-film thickness calculation to maximize X-ray fluorescence intensity in transmission arrangements (1986)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 15 (1986), S. 103-105 
    Details
    ISSN: 0049-8246
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Physik
    Notizen: Equations were obtained from physical theory to express the fluorescence intensity emitted by a sample in terms of the geometrical parameters of a source-sample-detector cylindrical symmetry arrangement. These equations allow the calculation of the optimum sizes of samples in XRF. The thickness required to maximize the detected fluorescence intensity, in terms of the value of the remaining physical and geometrical parameters, was determined. A thin sample in transmission geometry was considered, where excitation is produced by an isotropic monoenergetic x-ray source. The sizes of the detector and source are such that they are considered to be dimensionless compared with the sample. These approximations do not affect the validity of the results.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/xrs.1300150206
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  • 6
    Digitale Medien
    Digitale Medien
    Polarization effects and photon transport in x-ray spectrometryPresented at the European Conference on EDXRS, Budapest, Hungary, 30 May-3 June 1994. (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 24 (1995), S. 283-292 
    Details
    ISSN: 0049-8246
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Physik
    Notizen: The nature of the scattering interactions in the x-ray energy regime makes the effect of polarization extremely important, mainly when the incident beam is partially or totally polarized. The effects of the source polarization on the x-ray spectrum are analysed, stressing the points of interest in each case of unpolarized, linearly polarized and circularly polarized excitation.
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/xrs.1300240603
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  • 7
    Digitale Medien
    Digitale Medien
    1H NMR structural study of 2-phenylthiazolidine (1981)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 17 (1981), S. 68-70 
    Details
    ISSN: 0030-4921
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Deuteration of 2-phenylthiazolidine, and its complexation with the shift reagent tris(1,1,1,2,2,3,3-heptafluoro-7,7-dimethyl-4,6-octanedionato)europium, have been used to study the signals and conformation of the heterocyclic protons and to interpret the 1H NMR spectrum of this 2-substituted thiazolidine.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/mrc.1270170116
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  • 8
    Digitale Medien
    Digitale Medien
    Influence of interelement effects on x-ray fluorescence calibration curve coefficients for binary mixtures (1982)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 11 (1982), S. 70-78 
    Details
    ISSN: 0049-8246
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Physik
    Notizen: It has been shown that x-ray fluorescence calibration curve coefficients are closely related to matrix effects, such as absorption or absorption plus enhancement of the fluorescent radiation. In the classical paper of Rasberry and Heinrich,1 a single coefficient (named Aik) calibration curve was proposed when pure absorption is the predominant effect on the spectral line of interest. Similarly, and for practical purposes, a single coefficient (named Bik) was also considered when absorption and enhancement are present. We propose a new interpretation of calibration curve coefficients based on analytical expressions obtained recently for binary compounds under monochromatic excitation. Six distinct possible cases of calibration curves arise. Examples of binary compounds for each case are given. The data considered have been computed using the fundamental parameters method which allowed us to study a large number of possible mixtures for an arbitrary monochromatic excitation. Finally, through a different approach we discuss how this analysis could be extended to consider polychromatic excitation.
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/xrs.1300110209
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  • 9
    Digitale Medien
    Digitale Medien
    New EDXRS exploitation of compton scattering propertiesPresented at the European Conference on EDXRS, Budapest, Hungary, 30 May-3 June 1994. (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 24 (1995), S. 167-171 
    Details
    ISSN: 0049-8246
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Physik
    Notizen: The exploitation of the information that can be obtained from the energy analysis of Compton-scattered photons is discussed. It is shown that the use of the high-energy wing part of this energy distribution adds a further tool for EDXRS analysis other than the evaluation of the total fluence area of the Compton (or incoherent) distribution and the total fluence area of the Rayleigh (or coherent) peak. Special attention is paid to those situations for which easy and unambiguous coherent peak evaluation is prevented.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/xrs.1300240405
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  • 10
    Digitale Medien
    Digitale Medien
    SHAPE: A computer simulation of energy-dispersive x-ray spectraAn inspection copy for IBM/PC can be obtained from the authors on request. (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 20 (1991), S. 315-319 
    Details
    ISSN: 0049-8246
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Physik
    Notizen: The energy-dispersive x-ray spectrum is composed of a number of discrete XRF lines overlapping with a background which is due to processes of multiple scattering; both are modulated by the complex response function of the detector. Several physical processes contribute to the emission of x-rays. Under the isolated atoms assumption, the main interactions to be considered are the Rayleigh and Compton scattering and the photoelectric effect. All of these processes taken independently produce well defined and theoretically valuable contributions. Recently, the most important of the multiple scattering contributions involving these interactions have been established analytically in the framework of the transport theory. The two kinds of contributions together give a more detailed physical picture of an x-ray spectrom and make possible a closer comparison with experimental data. The SHAPE code uses this theoretical basis to simulate a complex x-ray spectrum, giving the capability of making a complete characterization of every contribution. The theoretical spectrum may be optionally processed by a routine that simulates the response function of a solid-state detector to produce a multi-channel-like output. Moreover, a graphic interface has been built in the program to allow the identification of the relative importances of the different processes and multiple scattering in every part of the spectrum with direct reading.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/xrs.1300200612
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