Inorganic ions, transport

Silver, S. and Walderhaug, M. (1992). Gene regulation of plasmid-determined and chromosome-determined inorganic ion transport in bacteria, Microbiol. Rev., 56, 195-228. 

Recent studies of inorganic ion transport have revealed possible relations to ATP metabolism (40, 42), phospholipideturnover (18), phosphoprotein turnover (3, 32), and oxidative phosphorylation (5, 41). These studies have opened fresh approaches to this problem and have raised hopes that some insight into the mechanism of ion transport will soon be attained. In contrast, progress in studies on amino acid transport has been somewhat less dramatic. 

In this section, we will be concerned with a concise review of the physical chemistry of inorganic ion transport in hypothetical unmodified BLM, that is, those membranes which do not contain protein or other mediating species. We shall not be concerned with hydrophobic or carrier transport or with channel or pore effects which have been reviewed extensively elsewhere (9,10). For the interested reader, much of the appropriate physics in this area has been reviewed by Lakshminarayanaiah (11), and the electrostatic aspects have been critically evaluated by Dorn (12). 

Ion transport through liquid organic membranes from one aqueous solution into another is a process which has a sequence of at least three steps, i.e. extraction from an aqueous sourse solution into the organic membrane, diffiision through the membrane due to a concentration gr ent, and reextraction into a receiving aqueous solution. In the case of inorganic ion transport facilitated by a low molecular weight carrier, the total process is complicated by reversible chemical interactions of the hydrophilic ion and usually much more hydrophobic carrier. As a result a... 

V. Inorganic Ion Transport and the Rapid Transmission of Electrical Signals over Long Distances (up to 1 m)... 

VII. Inorganic Ion Transport against a Concentration Gradient at Expense of ATP Hydrolysis... 

V. INORGANIC ION TRANSPORT AND THE RAPID TRANSMISSION OF ELECTRICAL SIGNALS OVER LONG DISTANCES (UP TO m)... 

VII. INORGANIC ION TRANSPORT AGAINST A CONCENTRATION GRADIENT AT EXPENSE OF ATP HYDROLYSIS... 

C Energy production and conservation G Carbohydrate transport and metabolism E Amino acid transport and metabolism F Nucleotide transport and metabolism H Coenzyme transport and metabolism I Lipid transport and metabolism P Inorganic ion transport and metabolism Q Secondary motabolites biosnth, transport. 

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