| http://www.w3.org/ns/prov#value | - made as well. When a fatty acid such as stearic or palmitic acid is used as the lipid, a lipid concentration of at least approximately 0.25 mg/cm.sup.2 is necessary. Concentrations of 0.50 to 0.80 mg/cm.sup.2 are preferred. After drying, the plate is
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