Ciliate conjugation is a sexual phenomenon that results in genetic recombination and nuclear reorganization within the cell. In most ciliate groups, however, the cells separate after conjugation, and both form new macronuclei from their micronuclei.
Before the bun, hamburgers are said to have been served between two pieces of bread. In fact, a ground beef patty was known as Hamburger steak (first mentioned in an American cookbook in 1891); when this was put between bread or in a bun it was called a Hamburger sandwich.
Tracing the source of the Hamburger (the meat patty in two pieces of bread) gets a little more tricky. The actual hamburger bun is said to be invented in 1916 by Walter Anderson, a short-order cook and founder of the first Hamburger chain âWhite Castleâ.