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Streptococcus pneumoniae: small colonies with raised edges displaying alpha-hemolysis on blood agar [8]: 223 Proteus sp. : swarming behaviour on blood agar [ 1 ] : 167 Serratia marcescens : red pigmentation: although considered characteristic of the species, only about 10% of specimens produce this pigment [ 8 ] : 236
Corynebacterium (/ k ɔː ˈ r aɪ n ə b æ k ˌ t ɪər i ə m,-ˈ r ɪ n-/) is a genus of Gram-positive bacteria and most are aerobic.They are bacilli (rod-shaped), and in some phases of life they are, more specifically, club-shaped, which inspired the genus name (coryneform means "club-shaped").
Chocolate agar is a type of blood agar plate in which the blood cells have been lysed by heating the cells to 80 °C. It is used for growing fastidious respiratory bacteria, such as Haemophilus influenzae. Chocolate agar is named for its color, and no chocolate is contained in the plate.
Hemolysis is the breakdown of red blood cells. The ability of bacterial colonies to induce hemolysis when grown on blood agar is used to classify certain microorganisms. This is particularly useful in classifying streptococcal species. A substance that causes hemolysis is called a hemolysin.
C. amycolatum also differs in its colony morphology; the species characteristically produces flat, whitish-gray, matte or waxy colonies on Schaedler blood agar. Its antibiotic sensitivity may also aid in its identification; the organism is generally resistant to multiple antibiotics.
Hemolysis is detected on human blood agar plates, and routine plating of specimens suspected of containing A. haemolyticum on human blood agar is suggested to distinguish it from Streptococcus pyogenes, as A. haemolyticum can easily be confused with this organism.
Colonies of B. cereus were originally isolated from a gelatine plate left exposed to the air in a cow shed in 1887. [11] In the 2010s, examination of warning letters issued by the US Food and Drug Administration issued to pharmaceutical manufacturing facilities addressing facility microbial contamination revealed that the most common contaminant was B. cereus.
Colonies tend to be cream-colored, but will turn red in the presence of iron in media, most likely as a result of pulcherrimin. [ 6 ] [ 9 ] B. licheniformis is found in a wide variety of environments, but especially in soil and in the feathers of birds, where B. licheniformis degrades β-keratin .