photocatalyst definition
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Definitions &Translations Definitions for photocatalyst. This page provides all possible meanings and translations of the word photocatalyst. Wiktionary(0.00 / 0 votes)Rate this definition: photocatalyst(Noun) A substance that absorbs light and, in doing so, catalyzes a reaction.
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Light-independent reactions The internal structure of a chloroplast. The light-independent reactions of photosynthesis are chemical reactions that convert carbon dioxide and other compounds into glucose. These reactions occur in the stroma, the fluid-filled area of a chloroplast outside of the thylakoid membranes.
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luciferase An enzyme present in the cells of bioluminescent organisms that catalyzes the oxidation of luciferin and ATP, producing light. Origin of luciferase.
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photoautotroph noun, Biology. 1. any organism that derives its energy for food synthesis from light and is capable of using carbon dioxide as its principal source of carbon. Origin of photoautotroph. 1945-1950.
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photosynthesis photosynthesis. noun. The process in green plants and certain other organisms by which carbohydrates are synthesized from carbon dioxide and a source of hydrogen (usually water), using light as an energy source. Most forms of photosynthesis release oxygen as a byproduct.
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Catalysis Learn more. Catalysts are chemical compounds that increase the rate of a reaction by lowering the activation energy required to reach the transition state. Unlike reactants, a catalyst is not consumed as part of the reaction process. The process of speeding up a reaction by using a catalyst is known as catalysis.
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photosystem Definition of photosystem : either of two photochemical reaction centers consisting chiefly of photosynthetic pigments complexed with protein and occurring in chloroplasts: a: one that absorbs light with a wavelength of about 700 nanometers — called also photosystem I b: one that absorbs light with a wavelength of about 680 nanometers — called also photosystem II new!
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chemolithoautotroph chem·o·lith·o·au·to·troph. noun. A chemosynthetic organism that obtains energy from the oxidation of inorganic compounds and uses carbon dioxide as its sole source of carbon for growth. Also called chemoautotroph, chemolithotroph.
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Photochemistry In the case of photochemical reactions, light provides the activation energy. Simplistically, light is one mechanism for providing the activation energy required for many reactions. If laser light is employed, it is possible to selectively excite a molecule so as to produce a desired electronic and vibrational state.
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Photoautotroph Photoautotroph. Definition. noun, plural: photoautotrophs. An organism, typically a plant, obtaining energy from sunlight as its source of energy to convert inorganic materials into organic materials for use in cellular functions such as biosynthesis and respiration.
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- Share to: To catalyze a reaction means to speed it up. Enzymes speed up reactions by bringing together the chemicals that are needed to react, rather than waiting for them to bump into… each other by chance. If it weren't for enzymes, most reactions in living cells would happen too slowly to be useful. 7 people found this useful.
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Definition of enzyme Definition of enzyme. 1) A protein that acts as a catalyst in biological systems. 2) An enzyme is a macromolecule, usually a protein, that functions as a (bio) catalyst by increasing the reaction rate. In general, an enzyme catalyzes only one reaction type (reaction selectivity) and operates on only one type of substrate (substrate selectivity).
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- (kăt′l-īz′) tr.v. cat·a·lyzed, cat·a·lyz·ing, cat·a·lyz·es. 1. To modify, especially to increase, the rate of (a chemical reaction) by catalysis. 2. To bring about; initiate: The technology bred of science has catalyzed stupendous economic growth (Nature).
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Photochemistry Photochemistry is the branch of chemistry concerned with the chemical effects of light. Generally, this term is used to describe a chemical reaction caused by absorption of ultraviolet (wavelength from 100 to 400 nm), visible light (400 - 750 nm) or infrared radiation (750 - 2500 nm).
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- Luciferase. Luciferase. (Science: enzyme) An enzyme from firefly tails that catalyses the production of light in the reaction between luciferin and atp. Used by the male firefly for producing light to attract females and used in the laboratory in a chemiluminescence bioassay for atp.Science: enzyme) An enzyme from firefly tails that catalyses the production of light in the reaction between luciferin and atp. Used by the male firefly for producing light to attract females and used in the laboratory in a chemiluminescence bioassay for atp.
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Optimal levels of oxygen deficiency in the visible light photocatalyst TiO 2â x and long-term stability of catalytic performance The Ti 3+ species form oxygen deficiency states approximately 1 eV below the conduction band (CB) minimum . Thus, TiO 2−x photocatalysts have visible light photocatalytic activity and a light yellow color [10,11,14,17].
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Vitamin D and other vitamins and minerals How well vitamin D works depends on the amount of other vitamins and minerals that are present in your body. The other vitamins and minerals needed to help vitamin D work well are called cofactors. To get the most benefit from vitamin D, you must have other cofactors in your body. Vitamin D has a number of cofactors; the ones listed below are the most important. Magnesium.
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Catalysis Catalysts are chemical compounds that increase the rate of a reaction by lowering the activation energy required to reach the transition state. Unlike reactants, a catalyst is not consumed as part of the reaction process.
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Enzyme Enzymes /ˈɛnzaɪmz/ are macromolecular biological catalysts. Enzymes accelerate, or catalyze, chemical reactions. The molecules at the beginning of the process are called substrates and the enzyme converts these into different molecules, called products. Almost all metabolic processes in the cell need enzymes in order to occur at rates fast enough to sustain life.
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- tr.v. cat·a·lyzed, cat·a·lyz·ing, cat·a·lyz·es. 1  1. To modify, especially to increase, the rate of (a chemical reaction) by catalysis. 2  2. To bring about; initiate: The technology bred of science has catalyzed stupendous economic growth (Nature).
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Definitions &Translations Freebase(0.00 / 0 votes)Rate this definition: Photoluminescence describes the phenomenon of light emission from any form of matter after the absorption of photons. It is one of many forms of luminescence and is initiated by photoexcitation, hence the prefix photo-.
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Nucleic acids Photolithography is a process used in microfabrication to selectively remove parts of a thin film (or the bulk of a substrate). It uses light to transfer a geometric pattern from a photomask to a light-sensitive chemical (photoresist, or simply resist) on the substrate.
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- Enzymes /ˈɛnzaɪmz/ are macromolecular biological catalysts. Enzymes accelerate, or catalyze, chemical reactions. The molecules at the beginning of the process upon which enzymes may act are called substrates and the enzyme converts these into different molecules, called products.
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Photoelectron spectroscopy Summary. 1  Photoelectron spectroscopy is a useful analytical tool used by chemists to determine the electronic structure of atoms and molecules. 2  Photoelectron spectrometers ionize samples by bombarding them with high-energy radiation, such as UV or x-rays, and detecting the number and kinetic energy of ejected electrons.
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Transketolase Transketolase is an enzyme of both the pentose phosphate pathway in all organisms and the Calvin cycle of photosynthesis. It catalyzes two important reactions, which operate in opposite directions in these two pathways.oreover, in the Calvin cycle this is the first reaction catalyzed by transketolase, rather than the second. In mammals, transketolase connects the pentose phosphate pathway to glycolysis, feeding excess sugar phosphates into the main carbohydrate metabolic pathways.
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- gene regulation. Chemiluminescence is the light emitted by a chemical reaction and bioluminescence is a type of chemiluminescence i n which the chemical reaction is catalyzed by an enzyme. Measurement of light from a chemical reaction is highly useful because the concentration of an unknown can be inferred from the rate at which light is emitted.