Separation of long DNA molecules by quartz nanopillar chips under a direct current electric field - Baba, Yoshinobu.; Horiike, Yasuhiro.; Kaji, Noritada.; Nakanishi, Hiroaki.; Nishimoto, Takahiro.; Takamura, Yuzuru.; Tezuka, Yojiro.; Ueda, Masanori.