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.
1 Bacterium â a genus of rod-shaped bacteria first described in 1828. 2  Haeckel does not explicitly assign this genus to the Monera. 3  Bacillus â a genus of spore-forming rod-shaped bacteria first described in 1835 Haeckel does not explicitly assign this genus to the Monera kingdom.fter the development of the microscope, attempts were made to fit microscopic organisms into either the plant or animal kingdoms. In 1676, Antonie van Leeuwenhoek discovered bacteria and called them animalcules, assigning them to the class Vermes of the Animalia.