. Biophysical science. Biophysics. 28 : 4/ Magnetic Measurements 531 is then determined. The entire apparatus is very small. The magnet is about 2 cm long and each half cylinder holds about ml. Instead of allowing the magnet to move, a servo system is employed to hold the Mirror Quartz Fiber Half-eel I 1. Quartz Fibers Brass Counterweight Magnet Half-cell 2, Moved Down as Indicated to Show Magnet Figure 2. The principle of the Rankine magnetic susceptibility balance. After A. S. Brill, H. den Hartog, and V. Legallais, "Fast and Sensitive Magnetic Susceptometer for the Study of Rapid B
. Biophysical science. Biophysics. 28 : 4/ Magnetic Measurements 531 is then determined. The entire apparatus is very small. The magnet is about 2 cm long and each half cylinder holds about ml. Instead of allowing the magnet to move, a servo system is employed to hold the Mirror Quartz Fiber Half-eel I 1. Quartz Fibers Brass Counterweight Magnet Half-cell 2, Moved Down as Indicated to Show Magnet Figure 2. The principle of the Rankine magnetic susceptibility balance. After A. S. Brill, H. den Hartog, and V. Legallais, "Fast and Sensitive Magnetic Susceptometer for the Study of Rapid Biochemical Reactions," Rev. Sci. Instr. 29: 383 (1958). magnet in place; the servo current is recorded. This instrument is not an absolute one; it must be calibrated using solutions of known suscep- tibility. This problem is discussed in considerable detail in the reference by Brill and co-workers. The use of a flow system and a rapid mixing chamber makes it possible to resolve short times after the start of the reaction, as discussed in Chapter 26. 4. Resonance Measurements Both of the balances described in the previous section measure the static magnetic susceptibility of a sample. This includes the effects of all the paramagnetic and diamagnetic molecules in the sample. There is no simple way of separating the various contributions. Resonance methods, in contrast, allow one to separate the effects of different para- magnetic species. Resonance methods are based on the quantum mechanical effect that magnetic dipoles are restricted so that their projection on the direction of a magnetic field can have only certain. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ackerman, Eugene, 1920-. Englewood Cliffs, N. J. , Prentice-Hall
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