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A Petri dish (alternatively known as a Petri plate or cell-culture dish) is a shallow transparent lidded dish that biologists use to hold growth medium in which cells can be cultured, [1] [2] originally, cells of bacteria, fungi and small mosses. [3]
As the surface area of most filters is less than that of a standard Petri dish, the linear range of the plate count will be less. [11] The Miles and Misra methods or drop-plate method wherein a very small aliquot (usually about 10 microliters) of sample from each dilution in series is dropped onto a Petri dish. The drop dish must be read while ...
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100 mm (3.9 in) diameter Petri dishes containing agar gel for bacterial culture Main article: Agar plate An agar plate or Petri dish is used to provide a growth medium using a mix of agar and other nutrients in which microorganisms, including bacteria and fungi , can be cultured and observed under the microscope.
The basic design of the Petri dish has not changed since being created by Petri in 1887. [4] It was a challenge to keep dishes free of dust and extra bacteria that could collect and alter samples; heavy bell jars used for this purpose having proved ineffective, six years later Petri created a transparent plate slightly larger than the dish ...
[1] [2] This process is called inoculation. The tool consists of a thin handle with a loop about 5 mm wide or smaller at the end. It was originally made of twisted metal wire (such as platinum, tungsten or nichrome), but disposable molded plastic versions are now common. The size of the loop determines the volume of liquid an inoculation loop ...
Search Pubmed or something for an article containing Petri dishes for examples, it's pretty much universally capital P. Just a quick addition to this discusson. I am publishing a book with MIT Press and the editors changed it to lower case P, even though that still seems weird to me. FWIW. -- Jyoshimi ( talk ) 17:42, 12 April 2024 (UTC) [ reply ]
Grain size (or particle size) is the diameter of individual grains of sediment, or the lithified particles in clastic rocks. The term may also be applied to other granular materials . This is different from the crystallite size, which refers to the size of a single crystal inside a particle or grain.