isomer


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i·so·mer

 (ī′sə-mər)
n.
1. Chemistry Any of two or more substances that have the same molecular formula but differ in the way their atoms are connected to each other, in the spatial orientation of their atoms, or, in the case of large molecules such as DNA, in their molecular topology.
2. Physics Any of two or more nuclei with the same mass number and atomic number that have different radioactive properties and can exist in any of several energy states for a measurable period of time.

[Greek īsomerēs, having equal share : īso-, iso- + meros, part, share; see (s)mer- in Indo-European roots.]

i′so·mer′ic (-mĕr′ĭk) adj.
i′so·mer′i·cal·ly adv.

isomer

(ˈaɪsəmə)
n
1. (Elements & Compounds) chem a compound that exhibits isomerism with one or more other compounds
2. (General Physics) physics a nuclide that exhibits isomerism with one or more other nuclides
isomeric adj

i•so•mer

(ˈaɪ sə mər)

n.
a chemical compound or nuclide that displays isomerism.
[1865–70; < Swedish (1830) < Greek isomerḗs equally divided =iso- iso- + -merēs, adj. derivative of méos part, division]

i·so·mer

(ī′sə-mər)
One of two or more compounds composed of the same chemical elements in the same proportions but having a different arrangement of the atoms. Isomers differ from one another in at least one physical or chemical property. Lactose and sucrose are isomers.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.isomer - a compound that exists in forms having different arrangements of atoms but the same molecular weight
chemical compound, compound - (chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight
Translations

isomer

[ˈaɪsəməʳ] Nisómero m

isomer

n (Chem) → Isomer(e) nt

isomer

[ˈaɪsəməʳ] nisomero
References in periodicals archive ?
Table 1: Regression analysis of the plot of peak area versus concentration for each isomer Standard Sample Standard equation Alpha-tocopherol Y = 6.01[e.sup.6] X - 4.02[e.sup.6] Alpha-tocotrienol Y = 1.16[e.sup.7] X - 1.16[e.sup.7] Gamma-tocotrienol Y = 9.88[e.sup.6] X - 1.00[e.sup.7] Delta-tocotrienol Y = 1.86[e.sup.7] X - 2.15[e.sup.7] Correlation Standard Sample coefficient, [R.sup.2] Correlation, r Alpha-tocopherol 0.999812 0.999906 Alpha-tocotrienol 0.999904 0.999952 Gamma-tocotrienol 0.999711 0.999856 Delta-tocotrienol 0.998702 0.999351 Fig.
The PubChem databases for the alpha-Patchouli isomer were CID442384, CID521903, CID6432585, CID3080622, CID10955174, and CID56928117.
Rotational isomerism which leads to spectral changes of merocyanine monomers is one of the intriguing issues since it is often difficult to keep a molecular isomer in the frozen state for further manipulation.
For processed Paeoniae Radix Alba, the relative contents of compounds 12, 36, 84, and 86 were remarkably increased except 12 compounds including pedunculagin, oxypaeoniflorin, 6-O-glucopyranosyl-lactinolide, 1, 2, 3, 6-tetra-O-galloylglucose isomer A, 1, 2, 3, 6-tetra-O-galloylglucose isomer B, tetragalloyl glucose C, galloylpaeoniflorin isomer II, hexagalloyl glucose, 3, 6-di-O-galloyl paeoniorin isomer, oxybenzoyl-oxypaeoniflorin, benzoyloxypaeoniflorin, and albiflorin R1 isomer III were newly generated and 13 compounds were not found after its compatibility with processed Atractylodis Macrocephalae Rhizoma.
Presence of the hydroxyethyl substituent could improve stability of open merocyanine isomer by obtaining of the cyclic oxazolidine isomers [20, 21].
The results are summarized in Table 3 and the major isomer is 4a (trans-isomer) [16,17].
Vitamin E is a fat soluble nutrient that exits in multiple isomer variants that have been shown to inhibit the development and progression of certain cancers by inhibiting mutational damage to DNA strands.
This result was in agreement with experimental finding that in which 4R was the predominant isomer (4R:4S, >95%) [14].
It is primarily manufactured by the Fischer esterifaction of acetic acid and butanol isomer in the presence of catalytic sulfuric acid.
The cis isomer of beta-carotene is more effective in treating vitamin A deficiency than the trans isomer.
* Isomer Partners LP, an existing subtenant which signed a new, direct 1,837 square-foot lease on a portion of the 26th floor;