Nitrate and Ammonium Assimilation by Roots of Maize (Zea maysL.) Seedlings as Investigated byIn Vivo15N-NMR

1992 ◽  
Vol 43 (5) ◽  
pp. 633-639 ◽  
Author(s):  
SARA AMANCIO ◽  
HELENA SANTOS
Keyword(s):  
Ammonium Assimilation ◽  
Nitrate And Ammonium Assimilation

Nitric oxide controls nitrate and ammonium assimilation in Chlamydomonas reinhardtii

2013 ◽  
Vol 64 (11) ◽  
pp. 3373-3383 ◽  
Author(s):  
Emanuel Sanz-Luque ◽  
Francisco Ocaña-Calahorro ◽  
Angel Llamas ◽  
Aurora Galvan ◽  
Emilio Fernandez
Keyword(s):  
Nitric Oxide ◽  
Chlamydomonas Reinhardtii ◽  
Ammonium Assimilation ◽  
Nitrate And Ammonium Assimilation

scholarly journals Turbulence simultaneously stimulates small- and large-scale CO2 sequestration by chain-forming diatoms in the sea

2018 ◽  
Vol 9 (1) ◽  
Author(s):  
Johanna Bergkvist ◽  
Isabell Klawonn ◽  
Martin J. Whitehouse ◽  
Gaute Lavik ◽  
Volker Brüchert ◽  
...  
Keyword(s):  
Primary Production ◽  
Large Scale ◽  
Secondary Ion Mass Spectrometry ◽  
Ammonium Assimilation ◽  
Nutrient Concentrations ◽  
Turbulent Shear ◽  
Small Scale ◽  
Isotopic Tracers ◽  
Mass Transfer Theory ◽  
Nitrate And Ammonium Assimilation

Abstract Chain-forming diatoms are key CO2-fixing organisms in the ocean. Under turbulent conditions they form fast-sinking aggregates that are exported from the upper sunlit ocean to the ocean interior. A decade-old paradigm states that primary production in chain-forming diatoms is stimulated by turbulence. Yet, direct measurements of cell-specific primary production in individual field populations of chain-forming diatoms are poorly documented. Here we measured cell-specific carbon, nitrate and ammonium assimilation in two field populations of chain-forming diatoms (Skeletonema and Chaetoceros) at low-nutrient concentrations under still conditions and turbulent shear using secondary ion mass spectrometry combined with stable isotopic tracers and compared our data with those predicted by mass transfer theory. Turbulent shear significantly increases cell-specific C assimilation compared to still conditions in the cells/chains that also form fast-sinking, aggregates rich in carbon and ammonium. Thus, turbulence simultaneously stimulates small-scale biological CO2 assimilation and large-scale biogeochemical C and N cycles in the ocean.

Expression of a ferredoxin-dependent glutamate synthase gene in mesophyll and vascular cells and functions of the enzyme in ammonium assimilation in Nicotiana tabacum (L.)

Planta ◽  
2005 ◽  
Vol 222 (4) ◽  
pp. 667-677 ◽  
Author(s):  
Magali Feraud ◽  
Céline Masclaux-Daubresse ◽  
Sylvie Ferrario-Méry ◽  
Karine Pageau ◽  
Maud Lelandais ◽  
...  
Keyword(s):  
Nicotiana Tabacum ◽  
Glutamate Synthase ◽  
Ammonium Assimilation ◽  
Vascular Cells ◽  
Nicotiana Tabacum L
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