Non-selective media for microbiology
Non-selective media are intended to cultivate microorganisms in order to multiply them. It is a simple culture medium without a selection agent that will allow the growth of microorganisms in an undifferentiated way.
The non-selective media can be basic or enriched depending on the organism to be cultivated because some require more elements to be able to multiply. They contain all the elements that most microorganisms need to grow.
Enriched media are basic media supplemented with nutrients such as blood, serum, egg, for example.
These media can be in solid (or semi-solid) or liquid form. The difference between these two types of media is the presence or absence of agar to solidify the medium. In general, the liquid medium is added to agar and then poured sterile into petri dishes in which it will solidify. Bacteria grown in liquid cultures often form colloidal suspensions.