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Metabolism (/ m ə ˈ t æ b ə l ɪ z ə m /, from Greek: μεταβολή metabolē, "change") is the set of life-sustaining chemical reactions in organisms.The three main functions of metabolism are: the conversion of the energy in food to energy available to run cellular processes; the conversion of food to building blocks of proteins, lipids, nucleic acids, and some carbohydrates; and the ...
The Columbian exchange, also known as the Columbian interchange, was the widespread transfer of plants, animals, precious metals, commodities, culture, human populations, technology, diseases, and ideas between the New World (the Americas) in the Western Hemisphere, and the Old World ( Afro-Eurasia) in the Eastern Hemisphere, in the late 15th ...
A hot, less-dense lower boundary layer sends plumes of hot material upwards, and cold material from the top moves downwards. Heat transfer is a discipline of thermal engineering that concerns the generation, use, conversion, and exchange of thermal energy ( heat) between physical systems. Heat transfer is classified into various mechanisms ...
Russia said on Tuesday it had important matters to discuss with Afghanistan's Taliban leaders and was working to remove the Taliban from its list of banned terrorist organisations. "This is a ...
Johnson Sea Link was a type of deep-sea scientific research submersible built by Edwin Albert Link. Link built the first submersible, Johnson Sea Link I, in 1971 at the request of his friend Seward Johnson, founder of the Harbor Branch Oceanographic Institute. It was the successor to Link's previous submersible, Deep Diver, which had been ...
Heat exchanger. A heat exchanger is a system used to transfer heat between a source and a working fluid. Heat exchangers are used in both cooling and heating processes. [1] The fluids may be separated by a solid wall to prevent mixing or they may be in direct contact. [2]
v. t. e. In finance, an exchange rate is the rate at which one currency will be exchanged for another currency. [1] Currencies are most commonly national currencies, but may be sub-national as in the case of Hong Kong or supra-national as in the case of the euro. [2]
Ion-exchange resin beads. An ion-exchange resin or ion-exchange polymer is a resin or polymer that acts as a medium for ion exchange.It is an insoluble matrix (or support structure) normally in the form of small (0.25–1.43 mm radius) microbeads, usually white or yellowish, fabricated from an organic polymer substrate.