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A low-frequency NMR spectrometer has been built that will accommodate sample volumes of 0.2 and 1.25 liters. A shielded solenoid provides a uniform field of about 10 G. Signals are detected by a symmetrical rf bridge whose coils are bank wound of litz wire with Q∼300 to 400 at 40 kHz. In the smaller coil the homogeneity is sufficient to distinguish signals of protons in protein from those in fat and water. Spectra have been obtained from gelatin, whole eggs, egg whites, egg yolks, and dead mice. In addition, what is believed to be the first NMR signal ever obtained from a whole living animal has been taken on an anesthetized rat.
Jackson et al. (Mon,) studied this question.
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