What is photo oxidation in biology?
Photo-oxidation means the release of electrons after absorption of a photon occurs during non-cyclic photophosphorylation. The oxidized CHL accepts an electron from the donor (H2O) and this leads to the synthesis of molecular oxygen from water.
What is photo oxidation in photosynthesis?
species is termed photooxidative stress. This can occur in two ways: (1) the donation of energy or electrons directly to oxygen as a result of photosynthetic activity; (2) exposure of tissues to ultraviolet irradiation. Photoinhibition and photooxidation only usually occur when plants are exposed to stress.
Is photo oxidation?
In polymer chemistry photo-oxidation (sometimes: oxidative photodegradation) is the degradation of a polymer surface due to the combined action of light and oxygen. Photo-oxidation causes the polymer chains to break (chain scission), resulting in the material becoming increasingly brittle.
What causes photo oxidation?
Photo-oxidation can change the composition of an oil. It occurs when the sun’s action on an oil slick causes oxygen and carbons to combine and form new products that may be resins. The resins may be somewhat soluble and dissolve into the water, or they may cause water-in-oil emulsions to form.
What is meant by photo-oxidation of chlorophyll?
Photo -oxidation in chlorophyll a means release of electrons from Chlorophylla (PSII/P680) after absorption of a photon. It occurs during noncyclic photophosphorylation. The oxidised Chlorophyll a accepts electron from donor (H2O) and this results in synthesis of molecular oxygen from water.
What is Photooxidative damage?
If the stress continues to build up then the chloroplasts are damaged due to which the photosynthesis is inhibited. It is called photooxidative stress. It can be reversed depending on the duration of exposure to light and the concentration of reactive oxygen species.
What is meant by photo oxidation of chlorophyll?
What is photo-oxidation of chlorophyll?
Which of the following pigment inhibit the photo-oxidation of chlorophyll?
The phycocyanins and phycoerythrins effectively absorb light over range of wavelengths that cannot be absorbed by chlorophyll. Thus they prevent chlorophyll from long and direct illumination and also from its photo-oxidation.
What is photo oxidation of chlorophyll A?
What is Photooxidative stress?
The light-dependent generation of active oxygen species is termed photooxidative stress. This can occur in two ways: (1) the donation of energy or electrons directly to oxygen as a result of photosynthetic activity; (2) exposure of tissues to ultraviolet irradiation.