What is the colony morphology of Staphylococcus aureus?
S. aureus is a facultatively anaerobic, Gram-positive coccus, which appears as grape-like clusters when viewed through a microscope, and has round, usually golden-yellow colonies, often with hemolysis, when grown on blood agar plates.
What are the 5 basic categories of colony morphology?
Colony Morphology
- Size.
- Shape.
- Color (also known as pigmentation)
- Texture.
- Height (a.k.a. elevation)
- Edge (a.k.a. margin)
How would you describe the morphology of a bacterial colony?
Colony morphology is a method that scientists use to describe the characteristics of an individual colony of bacteria growing on agar in a Petri dish. It can be used to help to identify them. A swab from a bin spread directly onto nutrient agar. Colonies differ in their shape, size, colour and texture.
What are 5 characteristics of bacterial colony morphology?
Characteristics of a colony such as shape, edge, elevation, color and texture. When recording colony morphology, it is important to also record color, optical properties (translucence, sheen) and texture (moist, mucoid or dry). However, remember that color is often influenced by environment.
What is the morphology of Staphylococcus?
Morphology: Spherical cocci; often forming regular and “grape-like” clusters. They occur singly, in pairs, tetrads, and short chains.
What are the 7 characteristics of bacterial colony morphology?
Colonies are described on the basis of size, shape, texture, elevation, pigmentation, and effect on growth medium.
What are colony morphology forms?
Form – The form refers to the shape of the colony. These forms represent the most common colony shapes you are likely to encounter. 1a. Size – The size of the colony can be a useful characteristic for identification.
What are the shape and size of each bacterial colony?
Bacteria. Each distinct circular colony should represent an individual bacterial cell or group that has divided repeatedly. Being kept in one place, the resulting cells have accumulated to form a visible patch. Most bacterial colonies appear white, cream, or yellow in color, and fairly circular in shape.
What is elevation in colony morphology?
2. Elevation – This describes the “side view” of a colony. These are the most common. 3. Margin – The margin or edge of a colony (or any growth) may be an important characteristic in identifying an organism.
What is the colony Colour of Staphylococcus aureus?
S. aureus produces the yellow pigment staphyloxanthin and characteristic gold-colored colonies are formed on all rich media including tryptic soy agar (TSA) at 37°C, brain heart infusion (BHI) agar and Luria Bertani (LB) agar.
What is the difference between Staphylococcus aureus and Staphylococcus epidermidis?
The key difference between epidermidis and aureus is that Staphylococcus epidermidis is a non-haemolytic bacterium while Staphylococcus aureus is a haemolytic bacterium. Epidermidis and aureus are species names of two bacteria in the bacterial genus Staphylococcus.
What is the shape of a staph colony?
This refers to the overall shape of the colony, such as circular, irregular, filamentous, and so on. For example, Staphylococcus aureus often shows up as perfectly circular colonies on an agar plate.
How to identify colony morphology of bacteria?
Basic elements you can identify in a colony morphology include the following: Image 1: The image shows the colony morphology of bacteria. Picture Source: microbeonline.com Form – it pertains to the shape of the colony such as filamentous, circular, and the likes. The form of the colony is subdivided into following:
What is the morphology of Staphylococcus aureus?
MORPHOLOGY OF STAPHYLOCOCCUS AUREUS 1 Shape – Round shape (cocci) 2 Size – 1 micron (diameter) 3 Arrangement of cells – Grape-like clusters 4 Motility – Non-motile 5 Flagella – Non-flagellated 6 Spores – Non-sporing 7 Capsule – present in some strains 8 Gram Staining reaction – Gram +ve More
What does a Bacillus subtilis Colony look like?
through completely lacking (opaque) Colony Pigmentation Colonies can come in a rainbow of colors. Bacillus subtilis Colony shape and size: irregular, large Margin: undulate (wavy) Elevation: umbonate Color: white, dull Texture: dry (or rough).