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If , after the work has been published , the publisher does not ensure that copies of the work are made available to the public within a reasonable period of time after having been requested to do so by the author , the author may rescind the agreement and retain the fee received . The major goals of the work are to provide a reference for future community policy modeling and analysis efforts , and to provide a group of examples of applications of modeling . A work is made available to the public when it is performed outside private premises , or when copies of the work are offered for sale , rental or lending , or otherwise distributed or displayed outside such premises . The general aims of the work are threefold : ( 1 ) to understand the molecular interactions between the major bioorganic molecules in a membrane-type environment , e.g ., amino acid-carbohydrate , porphyrin-amino acid , metalloporphyrin-ascorbic acid etc ., ( 2 ) to apply regio - and stereoselective interactions of major natural products in the synkinesis of complex , hopefully useful molecular assemblies , and ( 3 ) to learn how to disrupt lipid membranes , e.g ., in vesicles , under biological conditions in order to deliver entrapped materials , e.g ., nucleic acids .