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

/cat·a·lase/ (kat´ah-lās) a hemoprotein enzyme that catalyzes the decomposition of hydrogen peroxide to water and oxygen, protecting cells. It is found in almost all animal cells except certain anaerobic bacteria; genetic deficiency of the enzyme results in acatalasia.catalat´ic

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.

catalase

[kat′əlās]
Etymology: Gk, katalein, to dissolve
a heme enzyme, found in almost all biological cells, that catalyzes the decomposition of hydrogen peroxide to water and oxygen.

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.

catalase (kaˑ·t·las),

n an enzyme that breaks down hydrogen peroxide into water and oxygen.

catalase

a heme-containing enzyme that specifically catalyzes the decomposition of hydrogen peroxide and is found in almost all cells except certain anaerobic bacteria. The reaction can be used as a test in the identification of bacteria.
References in periodicals archive ?
It was found to be positive for glucose, lactose and sucrose fermentation (red colour appeared in test tube) but found to be negative for catalase test (no bubbles were formed), indole test (green layer is formed at the top of test tube), nitrate reduction test, citrate test (green-forest colour in test tube), methyl red Voges-Proskeur test (no red colour appears in test tube), casein hydrolysis test and for starch agar test (no clear zone formation) as shown in Table 1.
Samples Catalase Test Oxidase Test Gram staining LAB001-B Negative Negative Gram positive LAB002-C Negative Negative Gram positive LAB003-D Negative Negative Gram positive LAB004-E Negative Negative Gram positive LAB005-F Negative Negative Gram positive Table 2: Phenotypic identification of isolates using API 50 CHL Kits and API web.
The catalase test was conducted by placing one drop of 3 % hydrogen peroxide (Fisher Scientific Co.
All strains were tested positive for catalase test while negative for oxidase test.
levan formation, arginine hydroysis, indole production, phosphorous solubilization, gelatin liquefaction, oxidase test and catalase test (Table 3) which confirmed the identification of the selected isolates (I-7, I-15, I-18, I-23, I-24 and I-25) to be P.
Catalase test was performed by preparing 3% hydrogen, peroxide, H2O2, solution (3 ml H2O2 in 100 ml distilled water).
Then, preliminary characterization of this culture was carried using classical methods such as test of gram character, motility, Catalase test, Oxidase test, and indole production test and sugar fermentation.
Gram staining reaction, Potassium hydroxide solubility test, Catalase test, Starch hydrolysis, Motility test and Casein hydrolysis test were performed for confirmation of R.
These suspected colonies were subjected to spot indole test and catalase test and later tested for fermentation of sugars for confirmation of species.
Isolates were identified as GAS on the basis of p-hemolysis, Gram staining, negative catalase test result, positive pyrrolidonyl arylamidase test result, and agglutination with Lancefield group A antiserum.
Among 157 bacteria, 67 were selected on the basis of preliminary tests which included Gram staining reaction, catalase test and motility test.
Culture vials so collected were sent to laboratory for microscopy, catalase test, nitrate reduction test, culture and sensitivity, within half to one hour.