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Criteria for the formation of a salt bridge. A salt bridge is considered to be formed if the distance between any of the oxygen atoms of acidic residues and the nitrogen atoms of basic residues are within the cut-off distance (default 3.2 Angstroms) in at least one frame.The default distance cut-off can be changed by the user.he search can be restricted to a selection and/or a frame range given by the user. A salt bridge is considered to be formed if the distance between any of the oxygen atoms of acidic residues and the nitrogen atoms of basic residues are within the cut-off distance (default 3.2 Angstroms) in at least one frame.
In chemistry, a salt is an ionic compound that can be formed by the neutralization reaction of an acid and a base. Salts are composed of related numbers of cations and anions so that the product is electrically neutral. These component ions can be inorganic, such as chloride, or organic, such as acetate; and can be monatomic, such as fluoride, or polyatomic, such as sulfate. There are several varieties of salts. Salts that hydrolyze to produce hydroxide ions when dissolved in water are alkali sa