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- W1794110778 abstract "Summary A method is presented for isolation of 2–10 gm of highly purified nucleoli from Walker tumors. Initially, 0.5–1 kg of tumor was minced in a specially devised stainless steel mincer. The minced tissue was then homogenized in a continuous tissue homogenizer in 0.25 m sucrose containing 3.3 mm CaCl 2 . The nuclear preparation, obtained by continuous flow centrifugation, was subjected to sonic oscillation with a sonifier for periods of 1–2 min. The preparation was layered over 0.88 m sucrose and centrifuged for 20 min at 900 × g in a centrifuge with a large capacity to provide the nucleolar pellet. Electron microscopic and chemical analyses indicated that the preparation was highly purified and the nucleoli were morphologically similar to those in the tumor cells. The yield of nucleoli/kg of tissue was approximately 7 × 10 10 , i.e., 4.3 ml of packed nucleoli. Sucrose gradient sedimentation profiles revealed that the isolated tumor nucleoli contained relatively larger amounts of 35 and 45 S RNA than the whole nuclear preparation and very small amounts of 18 S RNA." @default.
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- W1794110778 date "1966-01-01" @default.
- W1794110778 modified "2023-09-23" @default.
- W1794110778 title "A large-scale procedure for isolation of nucleoli from Walker tumors." @default.
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