up vote 3 down vote accepted. $\pi$ is the name of the constant relating the diameter and circumferance of a circle. It's a definition, a particular constant that we thought deserved a name. $e$ happens to be the name of a constant from a particular limit. Like $\pi$, we named it because we thought it would be useful. In Physics, many, many constants have names. Gravitational constants, expansional constants, electrical constants, etc. Each is useful, but somewhat arbitrarily chosen.
Bacteria: The Monera Kingdom Bacteria are classified into two groups: Eubacteria (true bacteria) and Archaebacteria (Ancient Bacteria). They are autotrophic. 28-1 Chapter 28: Microbiology. 28-2 Viruses Viruses are noncellular, nonliving particles and therefore are not included in the classification scheme.
Kingdom Archaea â¢âarchaeâ bacteria= âancientâ bacteria â¢Contains most of the âextremophilesâ â¢Prokaryotes-no membrane bound organelles â¢Encompasses 5 phyla, and includes the methanogens and extreme halophiles and thermophiles.â¢Until 1977 archaea were classified as bacteria. The majority of archaea are extremophiles. â¢ Acidophile An organism with optimal growth at pH levels of 3 or below â¢ Alkaliphile An organism with optimal growth pH levels of 9 or aboveâ¢ Anaerobe An organism that does not require oxygen for growth.