WEEK 4, SS1 BIOLOGY CONCEPTS OF CULTURING

WEEK 4 CONCEPT OF CULTURING A pre-requisite to studying microbes is their cultivation under laboratory conditions. Hence, it is important to know the nutrients and physical conditions needed by the organisms. It is easier to grow bacteria, fungi, and algae in appropriate media. The material on or in which microbes grow in the laboratory is called culture medium. Some media are prepared from complex extracts of plant or animal tissues. A culture is the population of organisms cultivated in a medium. If a culture contains only one living species of organism regardless of the number of individuals, it is said to be a pure or axenic culture. A culture which contains two or more species growing together is called a mixed culture. An important medium used for growing microbes is agar. It is a dried polysaccharide extract of red algae which is used as a solidifying agent. It is not broken down by microbes. EVALUATION 1. What is a culture medium

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