... expression of the pro-tein of interest, allowing observation of the protein’sinfluence on the progression of the cell cycle and the silica biogenesis. As the regulation of NR expressionappears ... enables rapid protein production from introduced genes.Furthermore, the addition of both nitrate and appro-priate concentrations of ammonium allows, within lim-its, the control of the amount of ... completely shut off, the expression of genes that are under control of the Pnr ⁄ Tnr cassette.Decoupling of transcription and translation of gfp mRNATo further evaluate the properties of the Pnr ⁄...