General Purpose media is designed to grow most organisms and do not contain growth inhibitors. Standard Methods Agar and Blood Agar Bases are examples of general purpose media.
This is a special type of medium that is used to grow microorganisms that are damaged and have lost the ability to produce due to certain harmful environmental factors.
Differential media are bacteriological growth media that contain specific ingredients that allow to distinguish selected species or categories of bacteria by visual observation. Differential means are used to distinguish between organisms or groups of closely related organisms. Examples of differential media : Mannitol salts agar (mannitol fermentation = yellow) Blood agar (various kinds of hemolysis i.e. α, β and γ hemolysis) Mac Conkey agar (lactose fermenters, pink colonies whereas non- lactose fermenter produces pale or […]
Selective media are designed to inhibit unwanted commensal or contaminating bacteria and help to recover pathogen from a mixture of bacteria.
Enrichment media are liquid media that also serves to inhibit commensals in the clinical specimen. Selenite F broth, tetrathionate broth and alkaline peptone water are used to recover pathogens from fecal specimens.
It contains all the basic nutrients required for microbial growth and is used to preserve a particular type of microorganism, preferably bacteria or for a long time a set of different microbial entities.
Chocolate agar is a chocolate-brown colored medium as a result of red blood cell lysis. It is used primarily to isolate fastidious organisms like H. influenza.
Blood agar is a type of bacterial growth medium. It is mainly used to grow fastidious microorganisms such as streptococci. Such organisms do not grow well using an ordinary growth medium. They only grow in blood agar because this medium has inhibitors for some family of bacteria. The medium needs to be heated to inactivate the inhibitor and release a specific growth factor. Once the blood agar is heated, it will become chocolate agar. Examples […]
Nutrient agar is used as a general purpose medium for the growth of a wide variety of non-fastidious microorganisms. It consists of peptone, beef extract and agar. This relatively simple formulation provides the nutrients necessary for the replication of a large number of non-fastidious microorganisms. Agar is a complex polysaccharide. It is highly valuable to microbiologists, although it provides no nutrient support for bacteria. It is commonly used in the laboratory setting primarily because of the following reasons: It […]
Here are some of the different types of glass wares used in medical Laboratories. These are used to transport specific amounts of fluids from one place to another. B : Beakers. Simple containers used to hold samples and reagents. Bulb and graduated pipettes. These are used to transport specific amounts of fluids from one place to another. Burettes. These are used to dispense exact quantities of liquid into another vessel.