Cell culture molecular biology primarily involves cultures of cells on flat plastic dishes. This technique is known as two-dimensional (2D) cell culture, and was first developed by Wilhelm Roux who, in 1885, removed a portion of the medullary plate of an embryonic chicken and maintained it in warm saline for several days on a flat glass plate. From the advance of polymer technology arose today's standard plastic dish for 2D cell culture, commonly known as the Petri dish. Julius Richard Petri, a German bacteriologist, is generally credited with this invention while working as an assistant to Robert Koch. Various researchers today also
Butter dish using water to keep the butter away from the air, thereby keeping it fresh. The water is placed into the base of the dish and the butter is put into a bell-shaped lid, creating an air seal. Butter dish A butter dish is defined as "a usually round or rectangular dish often with a drainer and a cover for holding butter at table". Before refrigerators existed, a covered dish made of crystal, silver, or china housed the butter. The first butter dish was made by Simpson, Hall, Miller, and Co. around 1880 in Connecticut, out of silver. These butter dishes