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STUDIES ON SEPARATING PLASMA MEMBRANE FROM ROOTS OF PAULOWNIA SEEDLING BY AQUEOUS TWO-PHASE PARTITIONING Isolation of Plasma and Thylakoid Membranes from the Heterocystous Cyanobacterium Anabaena sp. PCC 7120 Purification of Plasma Membrane of Maize Sperm Cells by Aqueous Polymer Two-Phase partitioning