catalase

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Related to Catalase test: Oxidase test, coagulase test

catalase

 [kat´ah-lās]
a hemoprotein enzyme that specifically catalyzes the decomposition of hydrogen peroxide and is found in almost all cells except certain anaerobic bacteria. Deficiency results in acatalasia. adj., adj catalat´ic.

cat·a·lase

(kat'ă-lās), [MIM*115500]
A hemoprotein catalyzing the decomposition of hydrogen peroxide to water and oxygen (2H2O2 → O2 + 2H2O); a deficiency of catalase is associated with acatalasemia.

catalase

(kăt′l-ās′, -āz′)
n.
An enzyme found in living cells that catalyzes the decomposition of hydrogen peroxide, a potentially harmful oxidizing agent, into water and oxygen.

cat′a·lat′ic (kăt′l-ăt′ĭk) adj.

CAT

A gene on chromosome 11p13 that encodes catalase, an enzyme which plays a central role in the body’s defence against oxidative stress, converting the reactive oxygen species hydrogen peroxide (H2O2) to water and oxygen, thereby mitigating H2O2’s toxic effects.

Molecular pathology
Defects in CAT cause acatalasemia. Oxidative stress may play a role in the development of chronic or late-onset diseases—e.g., diabetes, asthma, Alzheimer's disease, systemic lupus erythematosus, rheumatoid arthritis and cancer.

cat·a·lase

(kat'ă-lās)
A hemoprotein catalyzing the decomposition of hydrogen peroxide to water and oxygen (2H2O2→ O2 + 2H2O).

catalase

An ENZYME found in the microbodies (peroxisomes) of cells and that promotes the reaction in which two molecules of hydrogen peroxide are converted to two molecules of water and one molecule of oxygen.

catalase

an iron-containing ENZYME found in tissues such as liver and potato tubers whose function is to catalyse the breakdown of toxic hydrogen peroxide, a by-product of aerobic respiration, into water and oxygen:

Catalase has the highest known TURNOVER RATE and works by reducing the ACTIVATION ENERGY required from about 80 kJ to less than 10 kJ.

References in periodicals archive ?
curvatus) characterised through molecular characterization was found to be negative for catalase test, indole test (green layer is formed at the top of test tube), nitrate reduction test, citrate test (no blue colour in test tube), methyl red Voges-Proskeur test (no red colour appears in test tube), casein hydrolysis test (not able to produce protease enzyme) and for starch agar test (not able to produce amylase enzyme) (Table 1).
For the pre-identification test, the isolates were subjected to catalase test, oxidase test and Gram staining as shown in Table 1.
Although other bacteria were more difficult to identify, some other methods used to aid in classifying each bacterial sample were performed, including the oxidase test, catalase test, and stab cultures.
Last, perform a catalase test (if the organism is not growing on MAC or EMB), or a commercial identification kit system (if the organism is growing on MAC or EMB).
A motility test (motility agar, Difco) and catalase test were also conducted in microtiter plates.
S.aureus was identified by colony morphology, Gram staining and confirmed by catalase, coagulase and DNase tests.19 Oxacillin sensitivity was determined by Kirby Bauer method using Ox disc (1ug).20,21 All other organisms were identified by standard methods, colony morphology, gram staining, oxidase test, catalase test and biochemical tests which included TSI, motility test, urease tests and citrate utilization tests.
Staphylococcus aureus gave positive result for catalase test; coagulase test is indicator test for Staphylococcus.
coli and identified through several biochemical tests (Urease production, Catalase test, Motility, Voges proskauer, Indole production, Carbohydrate fermentation tests, Methyl red and Citrate utilization) as given in Table I.
The bacteria isolated both aerobically and anaerobically showed characteristic colony growth, gram stained and confirmed by standard biochemical tests such as catalase test, oxidase test, Indole production, citrate utilization, methyl red test, Voges Proskauer test and sugar fermentation tests (Cowan and Steel, 1997).
Biochemical characterization of the bacterial isolates was done by catalase test, methyl red test, Oxidase test, Indole test, Voges proskauer test, DNAase test, Sudan III test and Motility test using Sulfide Indole Motility agar (Tittsler and Sandholzer, 1936).
The strains were tested for positive for catalase test while negative for oxidase and potassium oxidase.