What is the function of differential media?

Differential media are used to differentiate closely related organisms or groups of organisms. Owing to the presence of certain dyes or chemicals in the media, the organisms will produce characteristic changes or growth patterns that are used for identification or differentiation.

What is differential media selective media quizlet?

Selective media. A group is selected for growth in that media because it contains a substance that inhibits the growth of one but helps the other. Only $35.99/year. Differential media. Media that will cause one group of organisms to appear distinctly different usually by a color change.

How is Macconkey agar selective and differential?

This medium is both selective and differential. The selective ingredients are the bile salts and the dye, crystal violet which inhibit the growth of Gram-positive bacteria. The differential ingredient is lactose.

Can a selective media be differential?

Selective and differential media can be combined and play an important role in the identification of bacteria by biochemical methods. Another commonly used medium that is both selective and differential is eosin-methylene blue (EMB) agar. Therefore, EMB is selective for gram-negatives.

What’s the difference between selective and differential media?

The key difference between selective media and differential media is that selective media are used to grow and isolate a specific type of microorganism by suppressing the growth of other microorganisms while differential media are used to visually distinguish microorganisms from one another.

What are the differences between selective and differential media quizlet?

What is selective media? Allows the growth of some organisms while inhibiting the growth of others. What is differential media? Differentiates closely related organisms or groups of organisms based on the organism’s biochemical characteristics.

Is Thayer Martin Agar selective or differential?

Thayer-Martin agar is a selective medium used for the isolation of gonococci (Neisseria gonorrheae) from specimens containing a mixed flora of bacteria and/or fungi e.g. urogenital specimen. Modified Thayer-Martin (MTM) agar is a GC agar base containing vancomycin, colistin, nystatin, and trimethoprim lactate (VCNT).

Is MSA selective or differential?

This type of medium is both selective and differential. The MSA will select for organisms such as Staphylococcus species which can live in areas of high salt concentration (plate on the left in the picture below).