| http://www.w3.org/ns/prov#value | - Amphiphiles may be neutral or charged: when negatively charged, usually having as the anionic group, phosphate, carboxylate, sulfonate or sulfate, particularly phosphate; when positively charged, usually having as the cationic group, ammonium e.g. pyridinium, tetralkyl ammonium, etc., phosphonium, or sulfonium, particularly ammonium.
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