Actino-electric effects are observed in argentite and it is shown that the seat of conversion of light into electronic energy occurs both at the contacts as well as at certain spots on the crystal. The effect is found to be absent if the crystal structure is destroyed. The actino-electric current-intensity curves show a peculiar secondary effect at certain intensities. On investigation of the actino-electric e.m.f.'s with reference to varying times of exposure and constant times of recovery it is found that an exponential relation exists between them which can be represented by i=^Ae~a t , The a, however, is not a constant but increases with time of recovery and is the determining factor in the dark current and photoelectric hysteresis of the crystal. It may be very intimately connected with the positive part of the primary photo--electric current as described by Gudden and Pohl.
The proton relaxation times of muscles in the limbs of rats were measured after various types of experimental injury. Abnormalities of perfusion, the effect of histamine and of a non-specific myositis resulted in a significant prolongation of T1 and T2 in in-vitro experiments. It must be remembered that these were serious types of injury. It may be possible to demonstrate less extensive muscle changes by means of MR.
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