The marine red alga Gracilaria caudata J. Agardh has been used in Brazil for agar extraction, mainly in the northeast region of the country. Nitrogen availability is the most important abiotic factor in seawater that limits the growth of seaweeds. The enzyme nitrate reductase (NR) is the key regulatory point in the nitrogen assimilation in photosynthetic organisms. This study describes an in vitro assay, characterizing the enzymatic activity of NR in terms of kinetic constants and stability, its oscillation during the day and glucose effect on NR modulation. Maximal peaks of NR activity were recorded at 20 ºC and pH 8.0. The enzymatic stability in crude extracts stored at 3 ± 1 ºC decreased significantly after 48 hours. Apparent Michaelis-M...
Temperature responses of nitrate reductase (NR) were studied in the psychrophilic unicellular alga, ...
The phytoplankton form the largest group of marine plants. Animal productivity in the oceans is depe...
Light kinetics and diel cycles of nitrate reductase (NR) activity were studied in the upwelling ecos...
Nitrate is one of the most important stimuli in nitrate reductase (NR) induction, while ammonium is ...
A alga marinha Gracilaria tenuistipitata var. liui Zhang et Xia (Gracilariales, Rhodophyta) tem gran...
The enzyme nitrate reductase (NR) responsible for the conversion of nitrate to nitrite is considered...
Gracilariopsis lemaneiformis is an economically-valued species and widely cultured in China at prese...
No ambiente marinho a maior fonte de nitrogênio encontra-se na forma de nitrato, que é reduzido para...
Nitrate reductase (NR) activity was studied in the marine diatom Biddulphia longicruris. During 24 h...
Assimilatory nitrate reductase and glutamate dehydrogenase of the red alga Porphyridium aerugineum h...
A enzima nitrato redutase (NR) catalisa a redução do nitrato a nitrito e controla a taxa de assimila...
Every organism has different potential to accumulate NO3- from the environment. Nitrate reduction p...
1. The properties of nitrate reductase activities have been compared in several strains of Rhodopseu...
Nitrogen-limited continuous cultures of Cyanidium caldarium contained induced levels of glutamine sy...
Temperature responses of nitrate reductase (NR) were studied in the psychrophilic unicellular alga, ...
The phytoplankton form the largest group of marine plants. Animal productivity in the oceans is depe...
Light kinetics and diel cycles of nitrate reductase (NR) activity were studied in the upwelling ecos...
Nitrate is one of the most important stimuli in nitrate reductase (NR) induction, while ammonium is ...
A alga marinha Gracilaria tenuistipitata var. liui Zhang et Xia (Gracilariales, Rhodophyta) tem gran...
The enzyme nitrate reductase (NR) responsible for the conversion of nitrate to nitrite is considered...
Gracilariopsis lemaneiformis is an economically-valued species and widely cultured in China at prese...
No ambiente marinho a maior fonte de nitrogênio encontra-se na forma de nitrato, que é reduzido para...
Nitrate reductase (NR) activity was studied in the marine diatom Biddulphia longicruris. During 24 h...
Assimilatory nitrate reductase and glutamate dehydrogenase of the red alga Porphyridium aerugineum h...
A enzima nitrato redutase (NR) catalisa a redução do nitrato a nitrito e controla a taxa de assimila...
Every organism has different potential to accumulate NO3- from the environment. Nitrate reduction p...
1. The properties of nitrate reductase activities have been compared in several strains of Rhodopseu...
Nitrogen-limited continuous cultures of Cyanidium caldarium contained induced levels of glutamine sy...
Temperature responses of nitrate reductase (NR) were studied in the psychrophilic unicellular alga, ...
The phytoplankton form the largest group of marine plants. Animal productivity in the oceans is depe...
Light kinetics and diel cycles of nitrate reductase (NR) activity were studied in the upwelling ecos...