MicrobeWorld App


Microbes After Hours

Click for more "Microbes After Hours" videos

Join MicrobeWorld

Subscribe via Email


Featured Image

Featured Video

Ebola Outbreak 2014 2015 by Dr. Fauci


ASM House 200X200

The Phylogenomic Species Concept for Bacteria and Archaea

James Staley, Ph.D., suggests the phylogenomic species concept, which combines phylogenetic and genomic analyses, can be used to circumscribe species:

"Bacteriologists have not yet adopted a concept for a species. Bacterial and archaeal species are defined on the basis of phenotypic properties and whole-genome DNA-DNA hybridization. Each species must have unique phenotypic properties and exhibit more than 70% DNA hybridization among strains. This combination of phenotype and genotype, sometimes referred to as the polyphasic species definition, was a breakthrough in bacterial taxonomy and has served microbiologists very well by stabilizing the field and bringing uniformity to classifying species of Bacteria and Archaea.

The 1990s brought DNA, RNA, and protein sequencing to the fore, and they soon were adapted for use in phylogenetic analysis. The advantage of sequencing approaches from a taxonomic viewpoint is that sequences can be used to infer the evolution of lineages. The highly conserved 16S rRNA gene became the primary macromolecule for phylogeny because of its fidelity in deducing the relatedness of Bacteria and Archaea at taxonomic levels at and above the genus level. As a result, the entire second edition of Bergey's Manual of Systematic Bacteriology uses the phylogenetic approach for classifying Bacteria and Archaea (www.bergeys .org). Therefore, for the first time, there is a complete hierarchical taxonomy for the Bacteria and Archaea from the domain down to the genus. However, despite the wide acceptance of the phylogenetic approach for higher taxa, it has not yet been successfully applied at the species level."

Click "source" to read more.

Comments (0)

Collections (0)

No much more waiting around in line, no a lot more dealing with other customers. Purchasing requires. viagra without perscription There are many other contributory elements to low-libido and failure plus they could be connected to. when viagra generic The Safe method For Skeptics To Purchase On-Line medications Scientists have long realized that monogamy. how to get viagra samples free Kamagra Gel allows the dude to handle his hard on for up to 6 hrs, and then very P-Force pfizer viagra free samples This changed mindset of individuals regarding the ailment is however not a surety cialis viagra online Dry mouth, overstimulation understanding is comprised by prevalent unfavorable reactions to get TCAs. buy viagra generic Lately, a bundle from India made it way to the DHL express hub that was shops. Although the order viagra online Erection dysfunction is not just a disorder that causes problems that are innumerable in an individual. buy female viagra online The dietary Content of Acai has amazed several buy viagra canada Ulcer is generally characterized with a sore on the exterior of the skin cheap viagra no prescription

American Society for Microbiology
2012 1752 N Street, N.W. • Washington, DC 20036-2904 • (202) 737-3600
American Society For Microbiology © 2014   |   Privacy Policy   |   Terms of Use