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
French butter dish French butter dish A French butter dish is a container used to maintain the freshness and spreadable consistency of butter without refrigeration. This late 19th century French-designed pottery crock has two parts: a base that holds water, and a cup to hold the packed butter which also serves as a lid. The cup containing butter is placed into the base, where water creates an airtight seal that keeps the air (and thus oxygen) away from the butter so that refrigeration is not needed, and the butter can be used in its soft form. This method will keep butter for around