بسم الله الرحمن الرحيم 140 MICRO LAB 5 : PURIFICATION OF MICROORGANISM.

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Presentation transcript:

بسم الله الرحمن الرحيم 140 MICRO LAB 5 : PURIFICATION OF MICROORGANISM

Culture The organism growing on the media plate is called as culture Colony The number of cells of any organism living together

Types of Culture 1-Pure Culture 2-Contaminated culture More than one type of organism growing on the media plate Only one type of microorganism growing on the media plate

Purification of microorganism

Purification of Fungi: 1. With the help of inoculating needle 2. Take some material from the edge of an actively growing fungal colony 3. Inoculate it on another media plate 4. Incubate it for 2-3 days 5. Pure culture of the organism will appear.

Purification of Bacteria : 1- Streak plate Method Streak inoculum onto one portion of the plate Sterilize the loop Streak through the first inoculum and spread into second section Repeat several times Incubate, a single colony will be observed.

Streak pattern Bacterial growth pattern Nice isolation!

Which streak plate culture started as a pure culture. How can you tell? Answer: the one on the right, because all colonies look alike.

The Pour Plate Method Make serial dilutions of bacterial suspension Mix diluted sample with melted agar Pour into plate Incubate Observe for isolated colonies Purification of Bacteria :

Characters of colony

Form What is the basic shape of the colony? For example, circular, filamentous, etc. Margin What is the magnified shape of the edge of the colony? Elevation What is the cross sectional shape of the colony? Turn the Petri dish on end. Surface How does the surface of the colony appear? For example, smooth, rough, dull,wrinkled etc. Pigmentation For example, white, red, purple, etc.

Most bacterial colonies appear white, cream, or yellow in color, and fairly circular in shape.

The End أ. شروق الشهراني