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The principle of activated swelling has made available polymer particles in the range of 1–100 μm, highly uniform in size, and with great variations in morphology and chemical composition. A short description of the method is given. On the basis of monosized porous macroreticular particles, monosized magnetic polymer particles (MMP) are prepared which are uniform in size as well as in content of magnetic oxides. These particles have found applications in a number of selective cell separation procedures. Special types of MMP have been developed for isolation of organelles and viruses. The use of MMP as contrast agent in magnetic resonance imaging is shortly described.

A solid-state reference electrode has been constructed and tested. Experiments have shown that the reference electrode gives a negligible and constant contribution to the measured EMF. The solid-state reference electrode was used as a reference electrode for an Orion Fluoride (F ) selective electrode. This cell behaves satisfactorily compared to an Orion F -combination electrode. The first promising progress has therefore been made toward realization of a new solid-state reference electrode.