ionic bond

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the linkage between atoms or radicals of a chemical compound, or the symbol representing this linkage and indicating the number and attachment of the valencies of an atom in constitutional formulas, represented by a pair of dots or a line between atoms, e.g., H—O—H, H—C≡C—H or H:O:H, H:C:::C:H.
coordinate covalent bond a covalent bond in which one of the bonded atoms furnishes both of the shared electrons.
covalent bond a chemical bond between two atoms or radicals formed by the sharing of a pair (single bond), two pairs (double bond), or three pairs of electrons (triple bond).
disulfide bond a strong covalent bond, —S—S—, important in linking polypeptide chains in proteins, the linkage arising as a result of the oxidation of the sulfhydryl (SH) groups of two molecules of cysteine.
high-energy phosphate bond an energy-rich phosphate linkage present in adenosine triphosphate (ATP), phosphocreatine, and certain other biological molecules. On hydrolysis at pH 7 it yields about 8000 calories per mole, in contrast to the 3000 calories yielded by phosphate esters. The bond stores energy that is used to drive biochemical processes, such as the synthesis of macromolecules, contraction of muscles, and the production of the electrical potentials for nerve conduction.
high-energy sulfur bond an energy-rich sulfur linkage, the most important of which occurs in the acetyl-CoA molecule, the main source of energy in fatty acid biosynthesis.
hydrogen bond a weak, primarily electrostatic, bond between a hydrogen atom bound to a highly electronegative element (such as oxygen or nitrogen) in a given molecule, or part of a molecule, and a second highly electronegative atom in another molecule or in a different part of the same molecule.
ionic bond a chemical bond in which electrons are transferred from one atom to another so that one bears a positive and the other a negative charge, the attraction between these opposite charges forming the bond.
peptide bond the —CO—NH— linkage formed between the carboxyl group of one amino acid and the amino group of another; it is an amide linkage joining amino acids to form peptides.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

ion·ic bond

(ī-on'ik bond)
A type of chemical bond that forms between metal and non-metal ions through electrostatic attraction; the attraction between oppositely charged ions.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

ionic bond

an electrostatic bond.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
References in periodicals archive ?
Changes in ionic bond (A), hydrogen bond (B), and hydrophobic interaction (C) of normal and pale, soft and exudative (PSE)-like actomyosin during heating.
The overdrying potato starch can improve properties of surimi gel, as it promoted the formation of insoluble protein, decreased the amount of ionic bonds, and increased that of nondisulfide covalent bonds and hydrophobic interaction.
Sample CON 8% NPS Ionic bond (%) 1.14 [+ or -] 0.03 0.99 [+ or -] 0.02 Hydrogen bond (%) 1.79 [+ or -] 0.03 2.19 [+ or -] 0.02 Hydrophobic 47.84 [+ or -] 0.04 28.68 [+ or -] 0.00 interaction (%) Disulfide bond (%) 27.62 [+ or -] 0.07 12.27 [+ or -] 0.02 Sample 8% LMPS Ionic bond (%) 0.91 [+ or -] 0.01 Hydrogen bond (%) 2.93 [+ or -] 0.03 Hydrophobic 28.51 [+ or -] 0.05 interaction (%) Disulfide bond (%) 18.47 [+ or -] 0.06 CON (control, i.e., pure surimi gel), NPS (surimi gel with native potato starch), and LMPS (surimi gel with low-moisture potato starch).
Provided the gel has some time to relax between stretches, the ionic bonds between the alginate and the calcium can "re-zip," and the researchers have shown that this process can be accelerated by raising the ambient temperature.
In ionic bonds, donor atoms such as sodium tend to lose electrons easily while acceptor atoms such as chlorine tend to acquire additional electrons.
Thus, both the ionic bond and the covalent bond involve a magnetically bound (anti-parallel spin-aligned) electron pair that is attracted to two positively charged atomic nuclei by Coulomb forces.
The dissociation energy of the C-O-[Zn.sup.2+]-O-C (293 kJ/mol) ionic bond is intermediate to that of C-C (335 kJ/mol) and C-[S.sub.x]-C (147 kJ/mol) covalent crosslinks (ref.
The frequency and success of the group II element is an indication of their effectiveness in the introduction of ionic bonds into either short chain (i.e., nonpolymeric) or long chain (i.e., polymeric) backbones.
Natural nacre also benefits from so-called sacrificial ionic bonds between proteins, which break under stress but can reform.
This is thought to be associated with the breaking of ionic bonds. This peak is largely absent from the curves for the blends that include ZDA.
The salt seems to prompt the formation of strong ionic bonds between the oppositely charged amino acids in adjacent peptides.
They derive many of their unique physical and mechanical properties from the ionic bonds that are formed between the zinc cation and the carboxylate anions.