Petri dish Petri dish A Petri dish (sometimes spelled "Petrie Dish" and alternatively known as a Petri plate or cell-culture dish), named after the German bacteriologist Julius Richard Petri, is a shallow cylindrical glass or plastic lidded dish that biologists use to culture cellssuch as bacteriaor small mosses. Modern Petri dishes usually feature rings and/or slots on their lids and bases so that when stacked, they are less prone to sliding off one another. Multiple dishes can also be incorporated into one plastic container to create a "multi-well plate". While glass Petri dishes may be reused after sterilization (via an autoclave at
Chafing dish in New York, (2nd edition, 1894), featured a brief history of chafing dishes, followed by proper instruction for use, suggesting its novelty. Fannie Farmer's "Chafing Dish Possibilities" was published in Boston in 1898. Modern chafing dishes are made of light metal or ceramic casseroles with handles, sometimes covered with a Pyrex lid. Classic uses of a chafing-dish are in preparing Welsh rarebit or cheese fondue. Chafing dish A chafing dish (from the French "chauffer", "to make warm") is a kind of portable grate raised on a tripod, originally heated with charcoal in a brazier, and used for foods that require