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What is meant by photoactivation?

What is meant by photoactivation?

Medical Definition of photoactivation : the process of activating a substance by means of radiant energy and especially light also : photocatalysis — compare photoinactivation sense 2.

What is photoactivation in biology?

the activation or control of a chemical, chemical reaction, or organism by light, as the activation of chlorophyll by sunlight during photosynthesis.

Where does photoactivation of chlorophyll occur?

Light-dependent reactions take place in the thylakoid membrane. Light energy is absorbed by chlorophyll P680 (photoactivation) in photosystem (PS) II which is used to excite electrons to a higher energy level. Chlorophyll P680 loses the high energy electron to an electron acceptor in PSII.

What do you mean by activation of chlorophyll?

During photosynthesis, chlorophyll is activated by visible light, and an electron is promoted from its ground state to an excited state. In plants, this excited electron goes on to react with carbon dioxide and water, via photo induced electron transfer (PET).

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What is Photoexcitation biology?

Definition of photoexcitation : the process of exciting the atoms or molecules of a substance by the absorption of radiant energy.

What is photolysis water?

Photolysis is the splitting of water molecules in the presence of light into proton, electron and oxygen. It takes place during non-cyclic photophosphorylation. The protons are used to reduce NADP and electrons are fed to photosystem II.

What is photoactivation in microbiology?

Photoactivation, the activation of the latent oxygen-evolving activity by light, is a phenomenon widely observed for various photosynthetic organisms from blue-green algae to higher plants (1–4).

What is the purpose of photoactivation?

Photoactivation allows scientists to mark proteins of interest in living cells.

What is chemiosmosis in photosynthesis?

Chemiosmosis is the movement of ions across a semipermeable membrane bound structure, down their electrochemical gradient. An example of this would be the formation of adenosine triphosphate (ATP) by the movement of hydrogen ions (H+) across a membrane during cellular respiration or photosynthesis.

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What is chemiosmosis in Photophosphorylation?

In biology, chemiosmosis refers to the process of moving ions (e.g. protons) to the other side of the membrane resulting in the generation of an electrochemical gradient that can be used to drive ATP synthesis. Not only is chemiosmosis similar to osmosis.

What is chlorophyll chemistry?

Chlorophyll is the green pigment in plants, algae, and cyanobacteria that is essential for photosynthesis. Its central structure is an aromatic porphyrin or chlorin (reduced porphyrin) ring system with a sequestered magnesium atom. A fifth ring is fused to the porphyrin.

What is formula of chlorophyll?

C₅₅H₇₂O₅N₄Mg
Chlorophyll a/Formula