TY - JOUR KW - Multidisciplinary AU - Thomas Perkins AU - Douglas Smith AU - Steven Chu BT - Science DA - 1994-05 DO - 10.1126/science.8171335 IS - 5160 PB - American Association for the Advancement of Science (AAAS) PY - 1994 SP - 819 EP - 822 T2 - Science TI - Direct observation of tube-like motion of a single polymer chain VL - 264 SN - 0036-8075, 1095-9203 ER -