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  • Chemistry  (3)
  • Homologous/heterologous hybridizations  (1)
  • Organ specificity/sexual genotype  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Robust principal component analysis by projection pursuit (1993)
    New York, NY : Wiley-Blackwell
    Journal of Chemometrics 7 (1993), S. 527-541 
    Details
    ISSN: 0886-9383
    Keywords: Principal component analysis ; Projection pursuit ; Simulated annealing algorithm ; Robust statistics ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Principal component analysis (PCA) is a widely used technique in chemometrics. The classical PCA method is, unfortunately, non-robust, since the variance is adopted as the objective function. In this paper, projection pursuit (PP) is used to carry out PCA with a criterion which is more robust than the variance. In addition, the generalized simulated annealing (GSA) algorithm is introduced as an optimization procedure in the process of PP calculation to guarantee the global optimum. The results for simulated data sets show that PCA via PP is resistant to the deviation of the error distribution from the normal one. The method is especially recommended for use in cases with possible outlier(s) existing in the data.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cem.1180070606
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Maximum sum of binary-coded residuals (MASBR) regression as a robust procedure for treatment of spectral data (1995)
    New York, NY : Wiley-Blackwell
    Journal of Chemometrics 9 (1995), S. 373-387 
    Details
    ISSN: 0886-9383
    Keywords: robust regression ; outliers ; spectroscopy ; calibration ; MASBR (maximum sum of binary coded residuals) ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In this paper, a novel robust regression method, the maximum sum of binary coded residuals (MASBR), is proposed. Instead of the sum of squared residuals used in least squares regression as the minimization criterion, MASBR regression maximizes the sum of binary coded residuals. MASBR regression is designed for cases where the conventional robust regression methods with breakdown points less than 50% fail. To circumvent the problem of being trapped in local optima, a stepwise-varying acceptable error limit (SVAEL) algorithm is proposed. Both numerical simulation and treatment of real analytical data demonstrate the feasibility of MASBR regression in conjunction with the SVAEL algorithm.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cem.1180090505
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Hybridization kinetics and gene expression in Mercurialis annua flowers: Sexual genotype —specificity and correlation with hormonal contents (1989)
    Springer
    Molecular genetics and genomics 218 (1989), S. 545-553 
    Details
    ISSN: 1617-4623
    Keywords: Sex and male sterility differentiation ; Phytohormones ; Homologous/heterologous hybridizations ; Organ specificity/sexual genotype
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Sequences specifically transcribed in each sex type of Mercurialis annua have been demonstrated by comparative analysis of their poly(A)+ RNA populations (homologous and heterologous hybridizations). A comparison of the curves for fertile male genotype cDNAs/fertile male genotype poly(A)+ RNAs and fertile male cDNAs/female genotype poly(A)+ RNAs clearly demonstrates that the staminate flowers of fertile male plants have 6.5% specific sequences without counterpart in poly(A)+ RNAs of the pistillate flowers of female genotypes. The poly(A)+ population of genetic females is composed primarily of amplified male transcripts [female cDNAs/male poly(A)+ RNAs, 100% hybridizations with the homologous curve of female cDNAs/female poly(A)+ RNAs]. Cytokinin reproduces the amplification of male transcripts in the course of artificial feminization of genetically male individuals and exogenous benzylaminopurine induces sequences specific for feminization. The poly(A)+ RNAs of the constructed sterile male strain and the restored fertile male strain present 11.5% and 9.0% specificity, respectively, with reference to staminate flowers of fertile males [sterile or restored fertile male cDNAs/fertile male poly(A)+ RNAs]. The existence of differential sequences even in identical organs (stamens in normal genetic male plants or restored fertile male strain, pistils in normal genetic females or constructed females bearing male sterility determinants) is clearly demonstrated and correlated with the determinant genotype of these sex types and with the hormones they contain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00332422
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  • 4
    Electronic Resource
    Electronic Resource
    Dispersion of the oblique phonons in tetragonal BaTiO3 and Ce: BaTiO3 (1995)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 26 (1995), S. 295-299 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Raman spectra of oblique phonons in tetragonal BaTiO3 and Ce : BaTiO3 single crystals were obtained for different values of the angle θ which the phonon wavenumber q̄ makes with the c-axis. On the basis of Merten's equation, the directional dispersion curves were fitted and plotted. The results show that the A1(TO) phonons of BaTiO3 at 275 and 514 cm-1 come from first-order scattering, which is evidence for the order - disorder model of the ferroelectric phase transition. The Raman spectra of Ce : BaTiO3 are reported for the first time and the results indicate that Ce atoms have little effect on the structure of BaTiO3.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250260407
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    Paper (German National Licenses)
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