Abstract: A fat emulsion containing a prostaglandin E.sub.1 alkyl ester represented by the general formula ##STR1## wherein R denotes an alkyl group having 1 to 30 carbon atoms. The fat emulsion can be administered intravenously, has a long half-life of its effective ingredient, prostaglandin E.sub.1 alkyl ester, in the living body as well as a focus selectivity.

Abstract: An emulsifying dispersant is disclosed which is a nonionic surface active agent substantially free of a terminal primary hydroxyl group, obtained by esterifying or etherifying a terminal hydroxyl group of an alkylene oxide adduct of a hydroxyl compound or an alkylene oxide adduct of a carboxyl compound. This emulsifying dispersant is remarkably effective for preventing decomposition of a biocidal agent and for emulsifying the biocidal agent. A biocidal preparation formed using this emulsifying dispersant has good storage stability and good emulsion stability.

Abstract: A method is provided for preparing a stable liposome precursor in the form of a mixture of spray-dried liposomal components including one or more biologically active compounds which may be stored dry and reconstituted with water to form a liposomal preparation immediately prior to use. The dry liposome precursor is also provided.