Automatic Classification of Staphylococci by Principal-Component Analysis and a Gradient Method1
AUTOR(ES)
Hill, L. R.
RESUMO
Hill, L. R. (Università Statale, Milano, Italy), L. G. Silvestri, P. Ihm, G. Farchi, and P. Lanciani. Automatic classification of staphylococci by principal-component analysis and a gradient method. J. Bacteriol. 89:1393–1401. 1965.—Forty-nine strains from the species Staphylococcus aureus, S. saprophyticus, S. lactis, S. afermentans, and S. roseus were submitted to different taxometric analyses; clustering was performed by single linkage, by the unweighted pair group method, and by principal-component analysis followed by a gradient method. Results were substantially the same with all methods. All S. aureus clustered together, sharply separated from S. roseus and S. afermentans; S. lactis and S. saprophyticus fell between, with the latter nearer to S. aureus. The main purpose of this study was to introduce a new taxometric technique, based on principal-component analysis followed by a gradient method, and to compare it with some other methods in current use. Advantages of the new method are complete automation and therefore greater objectivity, execution of the clustering in a space of reduced dimensions in which different characters have different weights, easy recognition of taxonomically important characters, and opportunity for representing clusters in three-dimensional models; the principal disadvantage is the need for large computer facilities.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=277657Documentos Relacionados
- Principal-Component Analysis of the Characteristics Desirable in Baker's Yeasts
- CLUSFAVOR 5.0: hierarchical cluster and principal-component analysis of microarray-based transcriptional profiles
- ANALYSIS OF PLANT EXTRACTS FOR CHLOROPHYLLS a AND b BY A PHOTOELECTRIC SPECTROPHOTOMETRIC METHOD1
- Synchronization of Bacteria by a Stationary-Phase Method1
- A STUDY OF BACTERIAL SUBSTANCES STAINABLE BY THE HYDROGEN CHLORIDE METHOD1