Membrane lipid saturation index
nounPronunciation: /ˈmembreɪn ˈlɪpɪd ˌsætʃəˈreɪʃən ˈɪndeks/
The ratio of saturated to unsaturated fatty acids in plant cell membranes, which increases under cold or oxidative stress as a strategy to reduce membrane fluidity and prevent damage. Higher saturation indices indicate reduced membrane permeability and flexibility.
Plain English
A measure of how many rigid versus flexible fatty acids exist in plant cell membranes, changing during cold or stress conditions.
Etymology & History
Usage
"The membrane lipid saturation index increased significantly in cold-acclimated plants, stabilizing membrane structure at low temperatures."
Style guide notes: Specify fatty acid positions (palmitic, oleic) when describing saturation changes rather than generic references.
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Contrasted with
Related Terms
Frequently Asked Questions
How does membrane lipid saturation index affect cold tolerance?
Higher saturation reduces membrane fluidity, preventing excessive permeability and rupture at freezing temperatures.
Which stress conditions alter membrane lipid saturation?
Cold, drought, and oxidative stress trigger remodeling to increase saturated fatty acids, stabilizing membranes under adverse conditions.
Why Test Candidates on This?
Relevant for advanced research on molecular membrane adaptations under temperature and oxidative stress conditions.
Required skill level: Senior