What are the 5 basic categories of colony morphology?

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What are the 5 basic categories of colony morphology?

Terms in this set (6)

  • 5 basic categories of colony morphology. shape. margin. elevations.
  • Shape (3) Can be circular, irregular, or punctiform (tiny)
  • Margin (5) (FiLeR) entire (smooth with no irregularities)
  • Elevation (5) (PURFC) flat.
  • Texture (3) mucoid (use loop) moist- wet.
  • Pigment (2) color. density (opaque or clear)

What are the categories of colony morphology?

Colony morphological characteristics may be viewed with the naked eye, a hand lens, a stereo (dissecting) microscope, or a colony counter (Fig. 2.3). The seven basic categories include colony size, shape, margin (edge), surface, elevation, texture, and optical properties (Fig.

How would you describe a colony appearance?

Bacterial colonies are frequently shiny and smooth in appearance. Other surface descriptions might be: veined, rough, dull, wrinkled (or shriveled), glistening. 1c. Color – It is important to describe the color or pigment of the colony.

What is the margin of a colony?

Margin – Describes the shape of the edge of the colony when magnified. Common examples include entire (smooth), undulate (wavy), erose (serrated), filamentous, lobate, and curled. Surface – Describes how the surface of the colony looks. Examples include smooth, rough, glistening, dull, rugose, mucoid, viscous, etc.

What are 5 characteristics of bacterial colony morphology?

Colonies are described on the basis of size, shape, texture, elevation, pigmentation, and effect on growth medium. In this blog post, you will find common criteria that are used to characterize the bacterial growth.

How do you calculate CFU?

Calculate the number of bacteria (CFU) per milliliter or gram of sample by dividing the number of colonies by the dilution factor The number of colonies per ml reported should reflect the precision of the method and should not include more than two significant figures.

What are mucoid colonies?

mu·coid col·o·ny. a colony showing viscous or sticky growth typical of an organism producing large quantities of a carbohydrate capsule.

How would you describe a colony in microbiology?

In microbiology, a “colony” is a group of bacteria, fungi, and other microorganisms grown on a solid agar medium. The cells plated on this medium grow to form a mass, which can then be duplicated for further use in the lab.

What does colony morphology tell you?

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. Colonies differ in their shape, size, colour and texture.

What are bacterial colonies?

Bacterial Colony Definition and Overview A bacterial colony is what you call a group of bacteria derived from the same mother cell. This means that a single mother cell reproduces to make a group of genetically identical cells, and this group of cells form a mass, which is known as a bacterial colony.

How is colony morphology useful in bacterial identification?

Colony morphology can sometimes be useful in bacterial identification. Colonies are described as to such properties as size, shape, texture, elevation, pigmentation, effect on growth medium. In this blog post you will find common criteria that are used to characterize the bacterial growth.

What are the surface descriptions of a colony?

Other surface descriptions might be: veined, rough, dull, wrinkled (or shriveled), glistening. 1c. Color – It is important to describe the color or pigment of the colony.

What are the characteristics of a tiny bacterial colony?

Tiny colonies are also referred to as punctiform (pin-point). Colonies larger than about 5 mm are likely to be motile organisms. Bacterial colonies are frequently shiny and smooth in appearance. Other surface descriptions might be: dull (opposite of glistening), veined, rough, wrinkled (or shriveled), glistening.

How is the size of a colony measured?

1a. Size – The size of the colony can be a useful characteristic for identification. The diameter of a representative colony may be measured in millimeters. Tiny colonies are referred to as punctiform . 1b. Surface – How does the surface of the colony appear?

What are five characteristics of bacterial colony morphology?

How would you describe a bacterial colony?

A bacterial colony is what you call a group of bacteria derived from the same mother cell. This means that a single mother cell reproduces to make a group of genetically identical cells, and this group of cells form a mass, which is known as a bacterial colony.

What is the difference between bacterial morphology and colony morphology?

Explain. cellular morphology shows the difference of the individual cells that is seen under the microscope. Morphology of colonies can be defined as their color, shape, edge and elevation. These features are observed with the naked eye by looking at the colony itself.

What is bacterial colony morphology?

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 cough that was aimed directly onto nutrient agar. Colonies differ in their shape, size, colour and texture.

How do you measure bacterial colony?

Use the formula: [Number of colonies counted] × 10 × [how many times the sample must be multiplied to get to the original concentration: for example, 105] = Number of colony forming units (CFU) per milliliter of starting culture. This is the bacterial growth in your petri dishes.

What are the basic morphological features of bacteria?

1. Bacteria are complex and highly variable microbes. They come in four basic shapes: spherical (cocci), rod-shaped (bacilli), arc-shaped (vibrio), and spiral (spirochete) (Figure 1.3(A)).

What are the morphology of bacteria?

Bacteria are complex and highly variable microbes. They come in four basic shapes: spherical (cocci), rod-shaped (bacilli), arc-shaped (vibrio), and spiral (spirochete) (Figure 1.3(A)).

Why is bacterial colony morphology important?

Observing colony morphology is an important skill used in the microbiology laboratory to identify microorganisms. Colonies need to be well isolated from other colonies to observe the characteristic shape, size, color, surface appearance, and texture. Another important characteristic of a bacterial colony is hemolysis.

What are the three different types of bacterial morphology?

Most bacteria come in one of three basic shapes: coccus, rod or bacillus, and spiral.

What is meant by morphology of bacteria?

Bacterial morphology deals with size, shape, and arrangement of bacterial cells. Size of Bacteria. Bacteria are microscopic organisms that are less than 3 micrometeres (μm) in size.

Why do bacteria have different morphology?

The simplest conclusion is that morphological adaptation serves an important biological function. Simply put, bacteria with different shapes present different physical features to the outside world, and these features help cells cope with and adapt to external conditions.

What is an example of colony morphology?

The morphology of a colony results from characteristics of the individual bacteria viewed collectively. For example, Streptococcus pneumoniae colonies are smooth in appearance if the bacteria have a protective glycocalyx capsule and the colonies appear rough appearing in strains that do not have capsules.

What is the margin of a bacterial colony?

Most bacterial colonies are circular or irregular in shape. Some of them are actinomycetes filamentous or rhizoid. Most bacterial colonies are tiny and less than 1 mm in diameter. Hence, they are called punctiform (pin-point). They have a defined margin as well. The microscope can be used in order to observe the edge.

What is the definition of a bacterial colony?

bacterial colony. A discrete accumulation of a very large number of bacteria , usually occurring as a CLONE of a single organism or of a small number. Colonies grow best on selected media.

What is morphology of bacteria?

Bacterial Morphology . Bacterial morphology deals with size, shape, and arrangement of bacterial cells. Bacteria are microscopic organisms that are less than 3 micrometeres (μm) in size. Size of cocci range from 0.5 to 3 μm, and the size of a rod shaped bacteria range from 0.15 to 2 μm (width) to 0.5 to 20 μm (length).

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