Petri dish be used to observe plant germination, the behavior of very small animals or for other day-to-day laboratory practices such as drying fluids in an oven and carrying or storing samples. Their transparency and flat profile also mean they are commonly used as temporary receptacles for viewing samples, especially liquids, under a low-power microscope. 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
Minusheet perfusion culture system allows the simple bathing of cells respectively growing tissues under continuous medium transport (Fig. 4a). In a gradient container the tissue carrier is placed between the base and the lid so that both sides can be provided with individual media mimicking a typical environment for epithelia (Fig. 4b). A further culture container is made of a transparent lid and base allowing the microscopic observation during tissue development (Fig. 4c). In addition, a perfusion culture container can exhibit a flexible silicone lid. Applying force to this lid by an eccentric rotor simulates a mechanical load as required in cartilage and bone