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

Haplocladium microphyllum  moss samples were collected in Nanchang, China. Free amino acid (FAA) concentrations and N isotope compositions (δ 15 N FAA ) in the samples were determined and compared with the bulk N concentrations and δ 15 N bulk  values. The aim was to determine whether δ 15 N FAA  values in moss (which are very variable) indicate the sources of atmospheric N. The δ 15 N FAA  values among individual FAA varied widely (from −19.3‰ to +16.1‰), possibly because of the different sources of N and isotope fractionation in amino acids metabolic pathways. Total  15 N-enrichment for the individual FAAs was equal to total  15 N-depletion relative to δ 15 N bulk . The concentration-weighted mean δ 15 N value for total FAAs (TFAA) (δ 15 N TFAA ) was −3.1‰ ± 3.2‰, which was similar to δ 15 N bulk  (−4.0‰ ± 2.9‰). We concluded that a N isotope balance occurred during amino acid metabolism and that little isotope disparity occurred between the concentration-weighted TFAA and bulk N. We concluded that δ 15 N TFAA  ≈ δ 15 N bulk  ≈ δ 15 N source . The mean δ 15 N alanine  (−4.1‰), δ 15 N glutamate  (−4.2‰), and δ 15 N lysine  (−4.0‰) were similar to the mean δ 15 N bulk , which we attributed to little isotope fractionation occurring during their  in situ  the metabolic pathways. This suggests that δ 15 N alanine , δ 15 N glutamate , and δ 15 N lysine  in moss can be used to indicate the sources of atmospheric N deposition.

Compound-specific δ15N composition of free amino acids in moss as indicators of atmospheric nitrogen sources