Agar plate
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Agar plate
An agar plate streaked with microorganisms isolated from a deep-water sponge. Individual colonies may be seen center right.
Uses
Culturing
Related items
Petri dishGrowth medium
For information on agar plate preparation, please visit the Wikibooks Agar Plate page.
An agar plate is a sterile Petri dish that contains a growth medium (typically agar plus nutrients) used to culture microorganisms or small plants like the moss Physcomitrella patens.
Selective growth compounds may also be added to the media, such as antibiotics.
Individual microorganisms placed on the plate will grow into individual colonies, each a clone genetically identical to the individual ancestor organism (except for the low, unavoidable rate of mutation). Thus, the plate can be used either to estimate the concentration of organisms in a liquid culture or a suitable dilution of that culture using a colony counter, or to generate genetically pure cultures from a mixed culture of genetically different organisms, using a technique known as "streaking". In this technique, a drop of the culture on the end of a thin, sterile loop of wire is streaked across the surface of the agar leaving organisms behind, a higher number at the beginning of the streak and a lower number at the end. At some point during a successful "streak", the number of organisms deposited will be such that distinct individual colonies will grow in that area which may be removed for further culturing, using another sterile loop.
Types of agar plates
An agar plate being viewed in an electronic colony counter.
Like other growth media, the formulations of agar used in plates may be classified as either "defined" or "undefined"; defined medium is synthesized from individual chemicals required by the organism so that the exact molecular composition is known, whereas undefined medium is made from natural products such as yeast extract, where the precise composition is unknown.
Agar plates may be formulated as either permissive, with the intent of allowing the growth of whatever organisms are present, or restrictive or selective, with the intent of only allowing growth a particular subset of those organisms. This may take the form of a nutritional requirement, for instance providing a particular compound such as lactose as the only source of carbon and thereby selecting only organisms which can metabolize that compound, or by including a particular antibiotic or other substance in order to select only organisms which are resistant to that substance. This correlates to some degree with defined and undefined media; undefined media, made from natural products and containing an unknown combination of very many organic molecules, is typically more permissive in terms of supplying the needs of a wider variety of organisms, while defined media can be precisely tailored to select organisms with specific properties.
Agar plates may also be indicator plates, in which the organisms are not selected on the basis of growth, but are instead distinguished by a color change in some colonies, typically caused by the action of an enzyme on some compound added to the media.
Some commonly used agar plate types are:
Blood agar plates are often used to diagnose infection. On the left is a positive Staphylococcus infection, on the right a positive Streptococcus culture.
Blood agar types
Blood agar plate (BAP)
Contains mammalian blood (usually sheep or horse), typically at a concentration of 510%. BAP are an enriched, differential media used to isolate fastidious organisms and detect hemolytic activity. ?-hemolytic activity will show complete lysis of red blood cells surrounding colony. Examples include Streptococcus haemolyticus. ?-hemolysis will only partially lyse hemoglobin and will appear green. An example of this would be Streptococcus viridans. ?-hemolysis (or non-hemolytic) is the term referring to a lack of hemolytic activity.
Contains meat extract,tryptone, sodium chloride, and agar.
Chocolate agar (CHOC)
A type of blood agar plate in which the blood cells have been lysed by heating the cells to 56. Chocolate agar is used for growing fastidious (fussy) respiratory bacteria, such as Haemophilus influenzae. No chocolate is actually contained in the plate; it is named for the coloration only.
Thayer-Martin agar (TM)
Chocolate agar designed to isolate Neisseria gonorrhoeae.
TCBS
TCBS (thiosulfate citrate bile salts sucrose)-enriched agar enhances growth of Vibrio cholerae
General bacterial media
Four types of agar plates demonstrating differential growth...(and so on) To get More information , you can visit some products about Glass Chopping Boards, plastic aprons, . The Cordless Carving Knife products should be show more here!
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