The present invention provides a polyethylene glycol derivative having sugar residue-containing side chains and carboxyl group-containing side chains, and a method of preparing the same. The present invention also provides a carrier for drug delivery systems and a carrier for gene transfer, both comprising the polyethylene glycol derivative.
The present invention provides a polyethylene glycol derivative having sugar residue-containing side chains and carboxyl group-containing side chains, and a method of preparing the same. The present invention also provides a carrier for drug delivery systems and a carrier for gene transfer, both comprising the polyethylene glycol derivative.
Metal oxide nanotube and process for production thereof
申请人:Shimizu Toshimi
公开号:US20050077496A1
公开(公告)日:2005-04-14
Spiral shaped fibers were utilized to prepare completely novel metal oxide nanotubes comprising solely metal oxides. The metal oxide nanotubes comprise solely a hollow cylinder shaped metal oxide which may contain hydroxyl groups constituting a double helix and having hole diameter distributions containing two peak hole diameters ranging from 1 to 2 nm and from 3 to 7 nm. The tubes may be obtained by forming spiral shaped fibers from a solution of compound 1
and compound 2
and using the fibers as a template for making the nanotubes. The hydrogen adsorption and storage capacity of the metal oxide nanotubes are extremely good.