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.
The term Hamburger steak first appeared in the January 5, 1889 edition of the Walla Walla (Washington) Union. The steak was soon dropped but it wasnât until the 1930s that the word cheeseburger appeared and by 1939 hamburger had been shortened to burger.