TY - RPRT TI - Sucrose density gradient centrifugation for efficient separation of engineered nanoparticles from a model organism, Caenorhabditis elegans AU - Johnson, M E AU - Montoro Bustos, A R AU - Hanna, S K AU - Petersen, E J AU - Murphy, K E AU - Yu, L L AU - Nelson, B C AU - Winchester, M R PY - 2017 PB - National Institute of Standards and Technology CY - Gaithersburg, MD SN - NIST SP 1200-24 DO - 10.6028/NIST.SP.1200-24 ER -