A preparation of fibrin precipitated over a solid Celite (diatomaceous earth) matrix that selectively binds 50-70% of the plasminogen activator present in human blood plasma is described. Affinity chromatography of plasma on fibrin/Celite followed by gel filtration led to a 29,000-fold purification of the plasminogen activator. The activator, referred to as the high-affinity plasminogen activat...

Pairs of transcriptional activators in prokaryotes have been shown to activate transcription synergistically from promoters with two activator binding sites. In some cases, such synergistic effects result from cooperative binding, but in other cases each DNA-bound activator plays a direct role in the activation process by interacting simultaneously with separate surfaces of RNA polymerase. In s...

The Bi-activated strontium aluminates SrAl2O4 and Sr3Al2O6 are synthesised by the solid-phase method; their structural phase spectral-luminescent properties studied. possibility of controlling luminescence spectrum, its intensity and, consequently, colour characteristics samples changing composition matrix, nature activator concentration shown.