What is photo-oxidation in biology?

What is photo-oxidation in biology?

High intensity of light can oxidize the chlorophyll due to which chlorophyll loses its ability to photosynthesize. This can occur due to: Exposure of plants to UV rays of the sun. Donation of energy directly towards oxygen.

What is photo-oxidation of water?

The photolysis is an oxidative process and means splitting of water in the presence of light to form oxygen, protons and electrons. As a result, there is the evolution of oxygen and the electron move through Mn-protein bound to PS- II.

What is oil Photooxidation?

Direct photooxidation occurs when compounds in crude oil that absorb natural sunlight, such as polycyclic aromatic hydrocarbons, are oxidized. If this were the dominant pathway, oxidation would be limited to the tiny fraction of oil components that absorbs sunlight. Fig.

What is photooxidation of chlorophyll molecule?

Photo -oxidation in chlorophyll a means release of electrons from Chlorophylla (PSII/P680) after absorption of a photon. It occurs during noncyclic photophosphorylation. The electron move from oxidised chla to electron acceptor plastotoquinone and then further to other electon acceptors making electron transport chain.

What is photo-oxidation in phototherapy?

The absorptions of light by bilirubin also results in the generation of excited-state bilirubin molecules that react with oxygen to produce colorless oxidation products, or photooxidation products. This process occurs more slowly than configurational or structural isomerization.

What is a photosystem and where are they found?

Photosystems are the functional units for photosynthesis, defined by a particular pigment organization and association patterns, whose work is the absorption and transfer of light energy, which implies transfer of electrons. Physically, photosystems are found in the thylakoid membranes.

What is photo oxidation in phototherapy?

Is photosynthesis is a photochemical process?

Photosynthesis is a photochemical process by which green plants, seaweeds, algae, and certain bacteria absorb solar energy and utilize it to convert the atmospheric carbon dioxide to carbohydrates in the presence of water.

What is the product of photorespiration?

Phosphoglycerate
So the correct answer is ‘Phosphoglycerate’.

What is meant by Solarisation?

Definition of solarization 1 photography : a reversal of gradation in a photographic image obtained by intense or continued exposure Solarization creates a partially reversed image with an unusual negative and positive appearance.— Henry Horenstein. 2 : the act or process of solarizing something: such as.

What is the difference between photosystem I and photosystem II?

The main difference between photosystem 1 and 2 is that PS I absorbs longer wavelengths of light (>680 nm) whereas PS II absorbs shorter wavelengths of light (<680 nm).

What is phototherapy used for?

It’s called phototherapy, or light therapy. It uses ultraviolet rays to treat: Skin diseases like psoriasis, eczema, dermatitis, or vitiligo. Skin cancers like cutaneous lymphoma.

What do you mean by phototherapy?

(FOH-toh-THAYR-uh-pee) The treatment of disease with certain types of light. Phototherapy can use lasers, LED, fluorescent lamps, and ultraviolet or infrared radiation. Also called light therapy.

What is the photosystem made of?

Each photosystem is composed of a core complex and a peripheral antenna system, light harvesting complex I (LHCI) for PSI and light harvesting complex II (LHCII) for PSII, respectively.

What is photochemical reaction in chemistry?

photochemical reaction, a chemical reaction initiated by the absorption of energy in the form of light. The consequence of molecules’ absorbing light is the creation of transient excited states whose chemical and physical properties differ greatly from the original molecules.

What is photorespiration explain?

Photorespiration is a process which involves loss of fixed carbon as CO2 in plants in the presence of light. It is initiated in chloroplasts. This process does not produce ATP or NADPH and is a wasteful process. Photorespiration occurs usually when there is the high concentration of oxygen.