English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

The present work indicates that RNA primer requirements for poly(U) polymerase in the free ribosomes of the rat liver depend upon the degree of enzyme purification. The poly(U) polymerase activity obtained from a crude free ribosomal preparation was compared with the enzymic activity of a partially purified enzyme. After preliminary purification, the enzyme was fractionated by chromatography on Sephadex G-150 and CM-cellulose. Our results demonstrate the presence of several forms of poly(U) polymerase activities, some requiring exogenous RNA and others possessing their own endogenous primer RNA.

Comparison of endogenous and exogenous RNA primers of poly(U) polymerase in rat hepatic ribosomes