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.
A century later, the Library of Congress officially credits Louisâ Lunch for selling the first hamburger in the States. 1904 The hamburger makes its national debut at the St. Louis Worldâs Fair, thanks to a burger stand by Fletcher Davis of Athens, Texas. 1916 A fry cook named Walter Anderson creates a short, squat bun specifically made for hamburgers. Five years later, Anderson cofounds White Castle, the worldâs first burger chain.