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 Plus annual

Presents the access of premium content as premium feature

Premium Content

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 annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Anabaena sp. strain 7120 appeared more responsive to nitrogen control thanA. cylindrica. Growth in the presence of nitrate strongly repressed the differentiation of heterocysts and fixation of dinitrogen inAnabaena sp. strain 7120, but only weakly inA. cylindrica. Nitrate assimilation by ammonium-grown cultures was strongly repressed inAnabaena sp. strain 7120, but less so inA. cylindrica. The repressive effect of nitrate on dinitrogen assimilation inAnabaena sp. strain 7120, compared toA. cylindrica , did not correlate with a greater rate of nitrate transport, reduction to ammonium, assimilation into amino acids, or growth. Although both species grew at similar rates with dinitrogen,A. cylindrica grew faster with nitrate, incorporated more13 NO3 − into amino acids, and assimilated (transported) nitrate at the same rate asAnabaena sp. strain 7120. Full expression of nitrate assimilation in the two species occurred within 2.5 h (10 to 14% of their generation times) after transfer to nitrate medium. The induction and continued expression of nitrate assimilation was dependent on protein synthesis. The half-saturation constants for nitrate assimilation and for nitrate and ammonium repression of dinitrogen assimilation have ecological significance with respect to nitrogen-dependent growth and competitiveness of the twoAnabaena species.

Regulation of Expression of Nitrate and Dinitrogen Assimilation by Anabaena Species