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

SUMMARY: A comparative study was made of enzymes involved in nitrogen and carbon metabolism in the cyanobiont directly isolated from Cycas revoluta coralloid roots, and in the cultured isolate Nostoc 7422. The symbiotic Nostoc showed high activity of glutamine synthetase and glutamate synthase, the primary ammonia-assimilating enzyme system in cyanobacteria. Ammoniaassimilating glutamate dehydrogenase (GDH) activity was undetectable, although the catabolic GDH activity was high. Both glutamate-oxaloacetic acid transaminase and malate dehydrogenase showed higher activities in the symbiotic Nostoc than in the cultured Nostoc strain. The symbiotic Nostoc did not fix CO2 in vivo although in cell-free extracts both ribulose-1,5-bisphosphate carboxylase and phosphoribulokinase activities, similar to those in the cultured strain, were present.

The Cycas revoluta-Nostoc Symbiosis: Enzyme Activities of Nitrogen and Carbon Metabolism in the Cyanobiont