- Biological classification -
Biological classification is a form of scientific taxonomy(<->folk taxonomy ; bugs, ducks). 7 ranks are defined by international nomenclature codes.
Carolus Linnaeus's work is a being base of modern classification. What I understand in wikipedia (http://en.wikipedia.org/wiki/Biological_classification) is only that he shorten the name of living.
Since the 1960s, based on Darwinian principle which believe every species have come from common ancestor, cladistic taxonomy has emerged. This arrange taxon based on phylogenetic tree. This will be posted.
So , I found another webpage for bacterial taxonomy and I think this will be more helpful in practical to me (http://www.microbiologybytes.com/iandi/3a.html).
- Bacteria-Basic Facts -

Gram stain appearances of medically important bacteria
Gram strain (purple) have been used to dye bacteria for identification by microscope. If bacteria only have cell wall made by peptideglycan, it keep the purple color(gram positive). But the bacteria which have extra cell membrane composed of phospholipid lose the purple color(gram negative). In that case, red dye is used for dyeing.

Therefore, I found the other web-site (http://www.bacterio.cict.fr/classification.html). I think this will be last destination.
- Classification, taxonomy and systematics of prokaryotes (bacteria) -
- Additional information -
Strain, clone and species : comments on three basic concepts of bacteriology (http://jmm.sgmjournals.org/cgi/reprint/49/5/397.pdf)
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