Bead picker

Figure 10.27 Organizations of genetic material in the nucleus. Upper frame represents several nucleosomes (chromatosomes) arrayed in a beaded string fashion (100 A fibers) Circles represent histone octamers. HI histones are not shown. Lower frame represents a 100 A fiber wound in a solenoid fashion. There are six nucleosomes per turn in a solenoid (300 A fiber). DNA is wound around the histone octamer in a left-handed superhelix. In the solenoid, the winding may be left- or right-handed. (Reproduced by permission from Mainwaring WIP, Parish JH, Pickering JD, Mann NH. Nucleic Acid Biochemistry and Molecular Biology. Oxford Blackwell Scientific, 1982, pp. 268, 269.)...

Polystyrene used in injection molding is mamrfactured by the suspension bead process. Poly(methyl methacrylate) and its copolymers containing small amounts of acrylate esters are also produced by the bead suspension process. Clear transparent polymers are often required, so formulations involving Pickering dispersants (e.g., MgCOa) that can removed from the polymer with dilute acid after polymerization, are particularly advantageous. 

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