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 origin of the hamburger is not very clear, but the prevailing version is that at the end of 1800â² s, European emigrants reached America on the ships of the Hamburg Lines and were served meat patties quickly cooked on the grill and placed between two pieces of bread.