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Digitale Medien

Robust principal component analysis by projection pursuit (1993)

Xie, Yu-Long ; Wang, Ji-Hong ; Liang, Yi-Zeng ; [weitere]

New York, NY : Wiley-Blackwell

Journal of Chemometrics 7 (1993), S. 527-541

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ISSN: 0886-9383

Schlagwort(e): Principal component analysis ; Projection pursuit ; Simulated annealing algorithm ; Robust statistics ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: 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.

Zusätzliches Material: 7 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/cem.1180070606

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Digitale Medien

Survival of, and plasmid transfer between modified Enterobacter cloacae strains under long-term starvation conditions in a continuous-flow system (1999)

Sun, Li ; Bazin, Michael J. ; Lynch, James M.

Springer

World journal of microbiology and biotechnology 15 (1999), S. 639-642

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ISSN: 1573-0972

Schlagwort(e): Column reactors ; genetically-engineered microorganisms (GEMs) ; nutrient starvation ; plasmid transfer

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung

Notizen: Abstract Continuous-flow, packed-bed column reactors, which provide an experimental model of a soil profile, were used to investigate survival of, and plasmid transfer between, strains of Enterobacter cloacae. When columns, inoculated with nutrient-sufficient donor and recipient strains, were provided with a minimal salts medium with no added carbon source, transconjugant cells appeared in their effluents. During the first few days of such experiments, the concentration of cells in the effluent declined but then the donor population stabilized, while the recipient and transconjugant populations continued to decrease. The results indicate that the amount of nutrient required to maintain and transfer plasmids is very low. No transconjugants were observed in the effluent from columns inoculated with pre-starved donor and recipient strains.