What is the colony morphology of Bacillus?
Bacillus anthracis — Colony Characteristics Colonies are nonhemolytic, flat or slightly convex with irregular edges and ground-glass appearance. There are often comma shaped projections from the colony edge producing a “Medusa-head” colony. Colonies have a sticky consistency when manipulated with a loop.
What is the colony morphology of Bacillus cereus?
cereus colonies are large, feathery, dull, gray, granular, spreading colonies, and opaque with a rough matted surface and irregular perimeters. On blood agar, it is beta-hemolytic. Colony perimeters are irregular and represent the configuration of swarming from the site of initial inoculation, perhaps due to B.
What is the arrangement and cell morphology of Bacillus?
Bacilli (or bacillus for a single cell) are rod-shaped bacteria. Spirilla (or spirillum for a single cell) are curved bacteria which can range from a gently curved shape to a corkscrew-like spiral.
How is Bacillus cereus identified?
The traditional method of B. cereus detection is based on the bacterial culturing onto selective agars and cells enumeration. In addition, molecular and chemical methods are proposed for toxin gene profiling, toxin quantification and strain screening for defined virulence factors.
What is the Bacillus cereus group?
Bacillus cereus is a Gram-positive, rod-shaped, facultatively anaerobic, motile, beta-hemolytic, spore-forming bacterium commonly found in soil, food and marine sponges. The Bacillus cereus group comprises seven closely related species: B. cereus sensu stricto (referred to herein as B.
What is microbiology morphology?
morphology, in biology, the study of the size, shape, and structure of animals, plants, and microorganisms and of the relationships of their constituent parts. The term refers to the general aspects of biological form and arrangement of the parts of a plant or an animal.
What color is Bacillus cereus?
B. cereus colonies are usually a pink-orange color on Bacara or pink on MYP and may become more intense after additional incubation (see Fig. 1).
What is Bacillus polymyxa used for?
Paenibacillus polymyxa, formerly known as Bacillus polymyxa, is a plant growth promoting rhizobacterium (PGPR) used for the biocontrol of plant diseases [1], [2], [3], [4]. The Paenibacillus genus, a Gram-positive, aerobic, rod-shaped, endospore-forming bacterium, is a PGPR [5], [6].
What is the morphology of Paenibacillus polymyxa?
Paenibacillus polymyxa is an endospore-forming bacterium that is non-pathogenic and found in environments such as plant roots in soil and marine sediment [1] [2]. P. polymyxa is a Gram-positive, rod-shaped bacterium [3], that is also motile. It achieves motion via peritrichous flagella [3].
What is the size of Citrobacter colonies on agar?
Approximately 1 micrometer in diameter by 2.0-6.0 micrometers in length. Usually motile by peritrichous flagella. None. None. Citrobacter spp. grow readily on ordinary media. At 24 hours, colonies on nutrient agar are generally 2-4 millimeters in diameter, smooth, low, convex and moist.
What is Paenibacillus polymyxa Osy-DF?
Scanning electron microscope picture of Paenibacillus polymyxa OSY-DF. Source: Zengguo et al. 2007. Paenibacillus polymyxa is an endospore-forming bacterium that is non-pathogenic and found in environments such as plant roots in soil and marine sediment [1] [2]. P. polymyxa is a Gram-positive, rod-shaped bacterium [3], that is also motile.