Multiplication in the bulk: Photo‐generated elec‐tron–hole pairs are split and accelerated in amorphous selenium bulk, which trigger carrier multiplication generating extra carriers. This carrier multiplication boosts the signal of a photodetector, allowing ultra high‐sensitivity photodetection. The sensitivity of a prototype photodetector, evaluated in terms of external quantum efficiency, is up to 1,000 for ultraviolet light (∼375 nm), which suggests that up to 1,000 carriers are generated per incident photon. In the Letter by Masuzawa et al. (), the physics of the carrier multiplication has been investigated in terms of current–voltage characteristics of the prototype photodetector.
Several analogues substituted with fatty acid at the 2'-, 3'-, or 5'-position of the ribose moiety of N6,N6-dimethyladenosine were synthesized and tested for antitumor activity against cultured cells of L1210 leukemia and/or Ehrlich ascites. The cytotoxicity and increase of life span obtained with congeners in the N6,N6-dimethyladenosine 3'- or 5'-substituted series were comparable to in vitro or several times better in vivo than those of the mother compound.
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