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.
In April 1995, the governor of Oklahoma proclaimed that Tulsa is, in fact, the real birthplace of the hamburger. Oscar Weber Bilby is said to have served the first hamburger, bun and all, in 1891 at a Fourth of July part just west of what is now Tulsa. Hamburger becomes a fast food favorite. So, we know that the hamburger was around by the turn of the twentieth century, but Alan Rocke, a history professor at Case Western Reserve University, says that doesn't mean it was respected back then.