These methods comprise: [0020] (1) providing a lipid molecule having a nucleophilic moiety selected from a thiol moiety, an amine moiety and an alcohol moiety, the lipid molecule selected from (a) phosphoglycerides, (b) lipids having a sphingosine base as a backbone, (c) monoacylglyerols, (d) diacylglycerols, (e) glycosylacylglycerols, and (f) sterol compounds of the formula: [0021] where R is a b