Catalase activity
nounPronunciation: /ˈkætəleɪs ækˈtɪvɪti/
The enzymatic function of catalase, a peroxisomal enzyme that rapidly decomposes hydrogen peroxide into water and oxygen, thereby preventing reactive oxygen species (ROS) accumulation during abiotic stress. Enhanced catalase activity is a key component of antioxidant defense systems under stress.
Plain English
An enzyme that breaks down toxic hydrogen peroxide into water and oxygen, protecting cells from stress-induced damage.
Etymology & History
Usage
"Catalase activity increased significantly in heat-stressed tomato plants compared to controls, indicating enhanced antioxidant defense."
Style guide notes: Write as 'catalase activity' (two words); may abbreviate 'CAT' only after full first mention in same document.
Also known as
Contrasted with
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Frequently Asked Questions
Why is catalase important during abiotic stress?
Catalase rapidly detoxifies hydrogen peroxide, a reactive oxygen species produced during stress, preventing cellular damage to proteins, lipids, and DNA.
How is catalase activity measured in research?
Catalase activity is typically measured through spectrophotometric assays monitoring hydrogen peroxide disappearance or oxygen evolution at 240 nm wavelength.
Why Test Candidates on This?
Catalase activity assays are standard biochemical measurements for evaluating antioxidant stress response capacity in abiotic stress tolerance studies.
Required skill level: Junior