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Biologic systems alkali metal ions

The compounds just discussed have all been implicated in alkali metal-ion transport and related phenomena in biological systems. Substances such as these, which are capable of carrying ions across a hydrophobic membrane, are called ionophores. [Pg.228]

Not all complexes are purely electrostatic. In fact, many metal complexes in biological systems have covalent interactions as well. In these cases, the ligand donates a pair of electrons (acting as a Lewis base) to the metal, which functions as a Lewis acid. Therefore, metals can be evaluated based on their abilities to accept electron pairs. Alkali metal ions (Na+, K+) and alkaline earth metals (Mg2+, Ca2+) tend to not form stable complexes with Lewis base ligands. Transition metal ions, particularly those with vacant ri-orbitals, will form more stable complexes with Lewis base-acting ligands. [Pg.420]

The alkali metal ions are very important for the proper functioning of biological systems, such as nerves and muscles Na+ and K+ ions are present in all body cells and fluids. In human blood plasma the concentrations are... [Pg.873]

Shift Reagents for MRS of Alkali Metal Ions in Biological Systems 515... [Pg.501]

SHIFT REAGENTS FOR MRS OF ALKALI METAL IONS IN BIOLOGICAL SYSTEMS... [Pg.515]

Following the original paper, reports of the synthesis of new crowns and crown-like molecules proliferated. A typical property of these systems is their ability to form stable complexes with the alkali metal and alkaline earth ions. Prior to the synthesis of the crowns, the coordination chemistry of the above ions with organic ligands had received very little attention. A further impetus to the study of such complexes was the recognition of the important role of Na+, K+, Mg2+ and Ca2+ ions in biological systems. [Pg.90]

In spite of the overwhelming importance of the channel mechanism for the transport of alkali and alkaline earth metal ions in biological systems, only carrier transport has been studied extensively by chemists. Studies on ion channel mimics of simple structures have long been limited to antibiotic families of gramicidin, amphotericin B, and others. Several pioneers have reported successful preparation of non-peptide artificial channels. However, their claims have been based on kinetic characteristics observed for the release of metal ions through liposomal membrane and lacked the very critical proofs of channel formation. Such a situation was... [Pg.164]


See other pages where Biologic systems alkali metal ions is mentioned: [Pg.11]    [Pg.11]    [Pg.11]    [Pg.112]    [Pg.44]    [Pg.3]    [Pg.65]    [Pg.129]    [Pg.257]    [Pg.5]    [Pg.43]    [Pg.80]    [Pg.3]    [Pg.109]    [Pg.25]    [Pg.9]    [Pg.302]    [Pg.74]    [Pg.63]    [Pg.64]    [Pg.64]    [Pg.429]    [Pg.15]    [Pg.533]    [Pg.667]    [Pg.159]    [Pg.96]    [Pg.201]    [Pg.329]    [Pg.841]    [Pg.182]    [Pg.112]    [Pg.56]    [Pg.14]    [Pg.54]    [Pg.127]    [Pg.1079]   
See also in sourсe #XX -- [ Pg.317 , Pg.882 ]




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