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Ekplexite is a unique sulfide-hydroxide niobium-rich mineral with the formula (Nb,Mo)S 2 •(Mg 1−x Al x)(OH) 2+x. [5] [3] It is unique because niobium is usually found in oxide or, eventually, silicate minerals.
Title page to the first edition. Intended for young beginners, for whom it is well adapted, as an introduction to the study of chemistry. [3]According to Frank Wilczek: . It is a wonderful laying-bare of surprising facts and intricate structure in a (superficially) familiar process — the burning of a candle.
Edline was used in schools aiming to have paperless classes and homework. [3] The teacher could upload material such as homework, class expectations, and progress reports. The website mainly helped parents see if students had missed any homework and allowed parents or students to e-mail teachers. [ 4 ]
Diagram of mediator with cyclin-dependent kinase module. Mediator is a multiprotein complex that functions as a transcriptional coactivator in all eukaryotes.It was discovered in 1990 in the lab of Roger D. Kornberg, recipient of the 2006 Nobel Prize in Chemistry.
Chemistry is the scientific study of the properties and behavior of matter. [1] It is a physical science within the natural sciences that studies the chemical elements that make up matter and compounds made of atoms, molecules and ions: their composition, structure, properties, behavior and the changes they undergo during reactions with other substances.
The German chemistry magazine CHEManager wrote, quote: "In a double pack, the two companion works are simply unbeatable, because the knowledge gathered in both offers answers (almost) all questions that can arise in connection with chemical products and processes". [3] These two encyclopedias were compared in Reference Reviews in 2007. [10]
In the NO − 3 anion, the oxidation state of the central nitrogen atom is V (+5). This corresponds to the highest possible oxidation number of nitrogen. Nitrate is a potentially powerful oxidizer as evidenced by its explosive behaviour at high temperature when it is detonated in ammonium nitrate (NH 4 NO 3), or black powder, ignited by the shock wave of a primary explosive.
A module of finite length is a module that admits a (finite) composition series. finite presentation 1. A finite free presentation of a module M is an exact sequence where are finitely generated free modules. 2.