3228285 PDLC polymer-dispersed liquid crystal 90 3228288 PDLC periodontal ligament cells 61 3228290 PDLC Permanent dual lumen catheters 3 3228286 PDLC polymer-dispersed LC 3 3228287 PDLC periodontal ligament-derived cells 1 3228291 PDLC PIC-DOTAP Liposome Complex 1 3228289 PDLC Poona District Leprosy Committee 1 3228292 PDLC product development life cycle 1