LA RÉACTION 9Be(n, nn) αα A 15 MeV

La réaction 9Be(n, nn) αα étudiée à 15 MeV, par spectrométrie à double temps de vol, a lieu par une suite de réactions à deux corps et non par un processus quasi élastique. Les niveaux du 9Be de 4 à 10 MeV et leur désintégration sont étudiés. L'influence d'une résonance à deux corps par une troisième est discutée.The 9Be(n, nn) αα reaction is analysed at 15 MeV by double time-of-flight spectrometry. The results show a sequential process of two-body reactions. The decay of the 4 to 10 MeV 9Be levels is observed and the shift of the 8Be (2 +) free resonance by a third particle is discussed

Comparison of the expression patterns of genes coding for wheat gluten proteins and proteins involved in the secretory pathway in developing caryopses of wheat

The synthesis of gluten proteins in the developing caryopsis of wheat is highly coordinated, with mRNAs for the various groups being detected from 11 days after anthesis, and the proteins from about 14 days. In contrast, the levels of transcripts for BiP, PDI and PPI are highest at earlier stages of development. The levels of transcripts for two small GTP binding proteins involved in the secretory pathway (Rab1 and Rab5) are also highest early in development, which is consistent with the retention of most of the gluten proteins within the ER to form protein bodies