Notes

Differential effects of polyamines on rat thyroid protein kinase activities

“…Polyamines have been shown to augment incorporation of 32P into nonhistone chromatin proteins in several systems , and there are several lines of evidence that strongly support reversible phosphorylation as an important mechanism in the regulation of transcription. The reported alterations in the number of initiation sites [32], as well as RNA polymerase I [24,33,34] and RNA polymerase I1 [35] activities, suggest that control of transcription by reversible phosphorylation may be operative at several levels. Although our data suggests that the term polyamine-dependent protein kinase may be appropriate to describe, at least in part, messenger-independent protein kinase activity, Cochet and Chambaz have, in a recent review [9], suggested that, because polyamines may interact primarily with substrate, the term "polyaminemediated phosphorylation" may be more appropriate.…”

The Silver Iodide–Thallium Iodide Pseudo-Binary System

“…I n the region between 35 and 60 molyo AgI the liquidus may have greater detail than shown on the figure. The tetragonal phase AgTlI, (8) is not congruently melting and dissociates to AgTlJ, (A) and a silver rich phase a t 225 "C, close to the eutectic reaction a t 231 "C; these two events were, therefore, not always resolved across the whole range shown.…”

“…There is evidence, from the form of the liquidus a t high AgI levels, for the peritectic formation of a phase containing 2 85 mol% AgI, at 360 "C; this phase (7) reacts eutectoidally a t 205 "C to give a-AgI and AgTlI, (8). Additional evidence for the formation of this phase is found in the DTA cooling data on samples with < 70 molyo AgI, where the peritectic reaction a t 360 "C is clearly observed.…”

“…There are reports on the phase reactions of mixtures of AgI and TlI. There is some conflict [6,7] about the form of the liquidus for the system, but it is generally accepted that there are two intermediate compounds formed, corresponding to AgTlI, (8) and…”

“…AgTI,I, ( x ) ; it is not clear whether the latter compound forms congruently from the melt, although it is certain that the former does not. Both of these intermediate phases are stable a t room temperature and can be formed by co-precipitation from aqueous solution [8,91. The structure of AgTlI, has been shown to be tetragonal [8, lo], whereas no satisfactory indexing of the diffraction lines of AgTlJ, has been reported.…”