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Pentatricopeptide repeat (PPR) proteins are widely distributed in eukaryotes and are mostly localized in mitochondria or plastids. PPR proteins play essential roles in various RNA processing steps in organelles; however, the function of the majority of PPR proteins remains unknown. To examine the function of plastid PPR proteins, PpPPR_4 gene knock‐out mutants were characterized in Physcomitrella patens...
This paper investigates the time-dependence of the median particle size during comminution processes in horizontal and vertical stirred media mills. The shape of the time-dependent function describing the particle size is proposed, and it is shown that this function precisely traces the temporal variation of the particle size in comminution processes. The grinding rate constant is defined as the coefficient...
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