Table of Contents
What is the arrangement of Micrococcus?
Micrococcus species are strictly aerobic Gram positive cocci arranged in tetrads or irregular clusters, not in chains and cells range from 0.5 to 3µm in diameter. They are seldom motile and are non-sporing.
What is the margin of Micrococcus luteus?
Table 2
| Bacterial isolates | Colour on nutrient agar | Margin |
|---|---|---|
| Leuconostoc | Light yellow | Entire |
| Micrococcus | Bright Yellow | Entire |
| Staphylococcus aureus | Golden yellow colour | Entire |
| Lactobacillus | White | Entire |
How is Micrococcus luteus identified?
It can commonly be mis-identified by eye as Staphylococcus aureus due to the golden / yellow colour so identification beyond colony morphology is required. Other distinguishing identification features are that M. luteus is urease & catalase but coagulase negative.
What is margin in colony morphology?
Margin – The margin or edge of a colony (or any growth) may be an important characteristic in identifying an organism.
How would you describe a colony?
A colony is defined as a visible mass of microorganisms all originating from a single mother cell, therefore a colony constitutes a clone of bacteria all genetically alike. In the identification of bacteria and fungi much weight is placed on how the organism grows in or on media.
What are typical shapes of bacterial cells?
Individual bacteria can assume one of three basic shapes: spherical (coccus), rodlike (bacillus), or curved (vibrio, spirillum, or spirochete). Considerable variation is seen in the actual shapes of bacteria, and cells can be stretched or compressed in one dimension.
What is the Gram reaction and cell shape morphology of Micrococcus luteus?
Micrococcus luteus (M. luteus) is a Gram-positive to Gram-variable, non-motile, coccus, saprotrophic bacterium. It can form in tetrads or irregular clusters but not in chains and belongs to the family Micrococcaceae.
What is bacterial colony morphology?
Its definition is simple: colony morphology is simply the appearance of the colony once it grows on an agar plate. The visual cues provided by a cultivated bacterial colony serve as an important way for microbiologists to identify and isolate them via colony picking for other applications.
What is the diameter of Micrococcus luteus?
0.5 to 3.5 µm
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| Species/Subspecies: | Micrococcus luteus |
|---|---|
| Micromorphology: | Small cocci (0.5 to 3.5 µm in diameter), which are usually arranged in tetrads or irregular clusters. |
| Gram +/Gram -: | G+ |
| Metabolism: | Aerobic |
| Catalase/Oxidase: | +/+ |
What is Micrococcus luteus?
Micrococcus luteus is a spherical bacteria of between 0.5 and 3.5 millimeters in length that grows in aerobic environments and forms yellow colonies when grown on agar plates.
What is the morphology of Micrococcus?
Micrococcus species are strictly aerobic Gram-positive cocci arranged in tetrads or irregular clusters, and cells range from 0.5 to 3 µm in diameter. They are seldom motile and are non-sporing.
What is the morphology of Mycoplasma luteus?
The colony morphology of being yellow, shiny and smooth line up perfectly with M. luteus (Public Health England). The antibiotic resistance test showed only minor resistance to the antibiotic Oxacillin, which is likely due to a chance inheritance in the population or complete chance because of the weak strength.
What are the characteristics of Micrococcus lylae?
Micrococcus lylae are Gram-positive cocci mostly arranged in tetrads. They are catalase and oxidase positive whereas urease negative. They grow in circular, entire, convex, and usually non-pigmented or cream white colonies with diameters of approximately 4 mm after 2-3 days on the plate at 37°C.