A dreidel is a four-sided spinning top with a Hebrew letter on each side. It is used during Hanukkah to play a popular children's game that involves spinning the dreidel and betting on which Hebrew letter will be showing when the dreidel stops spinning.
The capsule is not synthesized by the closest relatives of B. anthracis, i.e., B. cereus and B. thuringiensis, and this criterion can be used to distinguish the species. Cell Walls The variability of cell wall structure that is common in many Gram-positive bacteria does not occur in the genus Bacillus. few species, such as Bacillus megaterium, require no organic growth factors; others may require amino acids, B-vitamins, or both. The majority are mesophiles, with temperature optima between 30 and 45 degrees, but some are thermophiles with optima as high as 65 degrees.
In 1872, Ferdinand Cohn, a contemporary of Robert Koch, recognized and named the bacterium Bacillus subtilis. The organism is Gram-positive, capable of growth in the presence of oxygen, and forms a unique type of resting cell called an endospore.The organism represented what was to become a large and diverse genus of bacteria named Bacillus, in the Family Bacillaceae.n order to accommodate former members of the genus Bacillus covered in this chapter, its title has been changed to  Gram-positive aerobic or facultative endospore-forming bacteria .