Magnetic sorting

Magnetic sorting may be accomplished with micron-sized or nanometer-sized particles [78]. Smaller nanoparticles produce suspensions that are stable against sedimentation due to gravity or an applied magnetic field, while larger particles can be used to take advantage of sedimentation as part of the separation process [79],... 

MACS and FACS are used instead of magnetic sorting with Dynabeads. 

A. Radbruch, B. Mechtold, A. Thiel, S. Miltenyi, and E. Pflueger, High-gradient magnetic sorting. Methods Cell Biol 42 387-403 (1994). 

In spite of such complications, magnetic sorting is used constantly in the field. Magnets can also be useful identification tools in conjunction with sophisticated quantitative instruments. For example, x-ray fluorescence analysis of a component showed it to be 100% chromium. This is because the technique utilizes only a very thin surface layer. A test with a magnet indicated attraction. It was concluded that the part was chrome plated and not solid chromium (which would have been very unlikely). 

Yeast display uses the a-agglutinin receptor to display recombinant proteins on the surface of Saccharomyces cerevisiae. Yeast display of scFvs or Fabs allows the detection and selection by fluorescence-assisted flow cytometry or by magnetic sorting. In addition, flow cytometry can be used for kinetic characterization of antibody affinity (K ) as well as K ff and rates. ... 

Fig. 3.2. High-resolution double-focusing mass analyser with Nier-Johnson geometry. The electrostatic sector filters ions according to kinetic energy before magnetic sorting according to m/z. The combination of electric and magnet fields produces narrow peaks and high spectral resolution.

Initial mineral grains were ground in a jaw crusher. The plagioclase and the apatite are sieved at 0.5-1 and 1-2 mm, respectively. The 0.5-1 mm fraction was magnetically sorted in order to remove grains containing ilmenite. Apatite and labradorite grains were also treated ultrasonically and washed with distilled water in order to remove the fine particles. 

Magnetic sorting of particles is of particular interest since it can be miniaturized easily and utilized in applications where a small sarr5>le volume is required. One of the chal-... 

The batteries are mechanically and magnetically sorted into different fractions according to their composition, i.e. after hand sorting, during which incorrectly sorted batteries and larger batteries are removed, they are sorted by size, and the R9 cells are sieved out. The round cells are run across a magnetic separator. The non-... 

Atomic clocks represent one of the basic applications of atom physics, for the precise measurement of time is one of the most important needs of present-day civilization. The most familiar are atomic clocks using a microwave transition in Cs. In 1967, an international standard was introduced for the second 1 second = 9192631770 cycles of the standard Cs transition. Cesium atomic clocks use the magnetic sorting of sublevels in Cs and the method of spatially separated fields (Ramsey 1987) to... 

---