Magnetizable materials

Cortex Biochem has found interesting applications for magnetizahle particles in analytical fields. Particles of the analytic aid are prepared Ifom a combination of magnetizable materials (iron oxide) and absorbing material (e.g., charcoal, polyacrolein, ion exchange, cellulose). The particles are dispersed in a biological sample to selectively absorb required compounds. After absorption was accomplished, particles with absorbed substance are removed from solution by a magnetized rod. The materials are used for separation of enzymes, protein, cells or bacteria. 

Magnetic filler n. Any permanently magnetizable material in powder form that may be incorporated into plastics to produce molded or extruded-strip magnets. Major ones in use are Alnico, rare earths, and, most used in plastics, hard ferrite. 

If there are inserts made from magnetizable materials, the fixation can be done using so-called holding magnets. 

The increase in flux density B = ixH- iqxH = i0 x M M is the magnetizability of the material inside the coil... 

There are examples in this book of fillers which have magnetic properties, but somebody in the act of inventiveness came to the conclusion that such material can be used for removing materials from their solutions and designed a composite which contains magnetizable particles attached to the various materials (e.g., selective adsobent of a particular material). By mixing this composite with a solution of material, material is adsorbed by adsorbent and removed from solution by a simple magnet. A new analytic technique was created which is very useful in pharmaceutical and biochemical research. 

We used an anti-TSH monoclonal antibody bound magnetizable microparticles as solid phase and alkaline phosphatase-labelled anti-TSH monoclonal antibody as a tracer. After 6 min incubation of solid phase, a tracer and sample or calibrator (30 fiL), microparticles were washed to remove unbound materials and were then incubated for 5 min with 50 /iL of chemiluminescence substrate, new 1,2-dioxetane derivative. The amount of enzyme-labeled monoclonal antibody that binds to the microparticles is directly proportional to the TSH concentration in the test sample. 

Magnetoquasistatic fields are used to manipulate cells either due to an intrinsic magnetizability, such as the iron in red blood cells, or by attaching magnetic materials to the cells for magnetically... 

For metallization, hb-PPh was admixed with octacarbonyldicobalt to form a cobalt complex. Refractive index values were measured for the neat hb-PPh and for the hb-PPh cobalt complex, indicating refractive index values of 1.704-1.681 together with low optical dispersion for the hb-PPh-cobalt complex, as verified by the high value of the Abbe number. The authors concluded that these materials could act as precursors to magnetic ceramics with high magnetizabilities. 

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