Dictionary of Chemistry [6th Ed.]
crystalliteA small crystal, e.g. one of the small crystals forming part of a microcrystalline substance. crystallizationThe proc ...
ZrO 2 ) made by fusing ZrO 2 and allow- ing it to cool under controlled condi- tions. It is used as an inexpensive diamond subst ...
She married the physicist Pierre Curie (1859–1906) in 1895 and soon began work on seeking radioactive el- ements other than uran ...
cyanine dyesA class of dyes that contain a –CH= group linking two ni- trogen-containing heterocyclic rings. They are used as sen ...
i.e. the rings are of carbon atoms. If different atoms occur in the ring, as in pyridine (C 5 H 5 N), the compound is said to be ...
C 6 H 12 N 4 , which is obtained from am- monia and methanal. Cyclonite is a very powerful explosive used mainly for military pu ...
teine molecules (see amino acid). This often occurs between adjacent cysteine residues in polypeptides. The resultant disulphide ...
D 2,4-D 2,4-dichlorophenoxyacetic acid (2,4-dichlorophenoxyethanoic acid): a synthetic auxin frequently used as a weedkiller of ...
tute for Heavy Ion Research where it wasÜrst produced. A Information from the WebElements site date-rape drugsDrugs that are u ...
acetyl group (–COCH 3 ) from a mol- ecule. Deacetylation is an important reaction in several biochemical path- ways, including t ...
were made by the Norwegian-born US chemist Lars Onsager (1903–76). Debye–Hückel theoryA theory to explain the nonideal behaviour ...
decalin(decahydronaphthalene) A liquid bicyclic hydrocarbon, C 10 H 18 , used as a solvent. There are two stereoisomers, cis (b. ...
solved, absorbed, or adsorbed gases from a liquid or solid. Degassing is important in vacuum systems, where gas absorbed in the ...
2:1. For instance, ethanol passed over hot pumice undergoes dehydration to ethene: C 2 H 5 OH – H 2 O →CH 2 :CH 2 Substances suc ...
d-orbital when viewed along the axis of a molecule and has two units of orbital angular momentum around the internuclear axis. T ...
measured in kg m–3. See also relative density; vapour density. density-function theoryA method for the theoretical treatment of ...
with a chemical structure that is sim- ilar to that of an existing drug. De- signer drugs are produced either to increase potenc ...
one neutron. The abundance of deu- terium in natural hydrogen is about 0.015%. It is present in water as the oxide HDO (see also ...
cal compound that rotates the plane of polarization of plane-polarized light to the right (clockwise as ob- served by someone fa ...
which rapidly darkens on standing in air. It is made by the reduction of 1,4- nitrophenylamine and is used as a photographic dev ...
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