Is Streptococcus mutans catalase positive or negative?
Is Streptococcus mutans catalase positive or negative?
Biochemical Test and Identification of Streptococcus mutans
| Basic Characteristics | Properties (Streptococcus mutans) |
|---|---|
| Catalase | Negative (-ve) |
| Gram Staining | Positive (+ve) |
| Hemolysis | Alfa Hemolysis |
| Motility | Non-motile |
Why is Streptococcus mutans gram positive?
Streptococcus mutans is a facultatively anaerobic, gram-positive coccus (round bacterium) commonly found in the human oral cavity and is a significant contributor to tooth decay….
| Streptococcus mutans | |
|---|---|
| Stain of S. mutans in thioglycollate broth culture. | |
| Scientific classification | |
| Domain: | Bacteria |
| Phylum: | “Firmicutes” |
Why is the catalase test useful for the differentiation of staphylococci from streptococci?
The catalase test is a particularly important test used to determine whether the Gram + cocci is a staphylococci or a streptococci. Catalase is an enzyme that converts hydrogen peroxide to water and oxygen gas. If bubbles appear (due to the production of oxygen gas) the bacteria are catalase positive.
What is the positive reaction of catalase test?
This test is used to identify organisms that produce the enzyme, catalase. This enzyme detoxifies hydrogen peroxide by breaking it down into water and oxygen gas. The bubbles resulting from production of oxygen gas clearly indicate a catalase positive result.
Does Streptococcus salivarius ferment glucose?
salivarius is able to use the sucrose to produce a capsule around itself. However, if sucrose is replaced by glucose as on a GYC (glucose, yeast extract, calcium carbonate) plate, S….
| Streptococcus salivarius | |
|---|---|
| Class: | Bacilli |
| Order: | Lactobacillales |
| Family: | Streptococcaceae |
| Genus: | Streptococcus |
What is the catalase test in microbiology?
The catalase test involves the mixing of inoculum with hydrogen peroxide. If the test organisms contain catalase, they can easily degrade H 2 O 2 into H 2 O and O 2 (in the form of bubbles). There will be no formation of gas bubbles if a test organism lacks catalase.
Is Enterococcus catalase positive or negative?
The catalase test is primarily used to distinguish among Gram-positive cocci: members of the genus Staphylococcus are catalase-positive, and members of the genera Streptococcus and Enterococcus are catalase-negative.
Is Streptococcus a catalase anaerobic or aerobic?
Streptococcus bacteria are mostly facultative anaerobes (may produce catalase), while few are obligate anaerobes (cannot produce catalase). Staphylococcus bacteria are aerobic and contain catalase enzyme to break down the reactive oxygen forms like superoxide and hydrogen peroxide.
What are the basic characteristics of Streptococcus mutans?
Biochemical Test and Identification of Streptococcus mutans Basic Characteristics Properties (Streptococcus mutans) Hemolysis Alfa Hemolysis Motility Non-motile OF (Oxidative-Fermentative) Facultative anaerobes Oxidase Negative (-ve)
