Identifying bacteria on agar plates

Bacterial colony morphology chart

This exercise will help you identify the cultural characteristics of a bacterium on an agar plate - called colony morphology. Mix, V. Turn the Petri dish on end. These are the most common. In this blog post you will find common criteria that are used to characterize the bacterial growth. Circular, Irregular, Filamentous, Rhizoid etc. Chromogenesis pigmentation - For example, white, buff, red, purple, etc. J medium , red colored colonies of Serratia marcescens. Opacity - For example, transparent clear , opaque, translucent almost clear, but distorted vision, like looking through frosted glass , iridescent changing colors in reflected light , etc. Budvytiene, M. In fact there is a book called Bergey's Manual of Determinative Bacteriology commonly termed Bergey's Manual that describes the majority of bacterial species identified by scientists so far. Form of the bacterial colony: — The form refers to the shape of the colony.

Request permissions Bacterial culture detection and identification in blood agar plates with an optoelectronic nose S. Characteristics of Bacterial colonies This post was most recently updated on May 9th, Bacteria grow on solid media as colonies.

Fungal colonies vs bacterial colonies

Opacity of the bacterial colony: Is the colony transparent clear , opaque not transparent or clear , translucent almost clear, but distorted vision—like looking through frosted glass , iridescent changing colors in reflected light. In the above picture of a mixed culture, an agar plate that has been exposed to the air and many different colony morphologies can be identified. Martino, P. Some important terminologies Draughtsman colonies Draughtmans colonies of S. Opacity - For example, transparent clear , opaque, translucent almost clear, but distorted vision, like looking through frosted glass , iridescent changing colors in reflected light , etc. Authors contributing to RSC publications journal articles, books or book chapters do not need to formally request permission to reproduce material contained in this article provided that the correct acknowledgement is given with the reproduced material. Not only are pigment differences seen, but also size, edge, pattern, opacity, and shine.

These are the most common. Circular, Irregular, Filamentous, Rhizoid etc.

fungal colony morphology identification

Opacity - For example, transparent clearopaque, translucent almost clear, but distorted vision, like looking through frosted glassiridescent changing colors in reflected lightetc.

Size of the bacterial colony: The size of the colony can be a useful characteristic for identification. Some pigments are water-soluble, others are not.

cultural characteristics of bacteria

Elevation - What is the cross sectional shape of the colony? Characteristics of Bacterial colonies Colony morphology can sometimes be useful in bacterial identification.

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Observing microbes