Results 211 to 220 of about 136,576 (266)

Nitrate uptake and nitrate reduction in synchronous Chlorella

Planta, 1979
Nitrate uptake was followed continuously in cultures of Chlorella sorokiniana using ionsensitive electrodes. During the lifecycle of the synchronous cell cultures, a drastic increase occurred in the first hour after the onset of the light. Nitrate uptake rate was shown to be dependent on illumination intensity, nitrate concentration, and temperature ...
R, Tischner, H, Lorenzen
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Nitrate Reduction and signalling

2001
The ability to use nitrate as sole nitrogen source to sustain growth is a property shared by some bacteria and fungi and by most algae and plants. The biochemical pathway responsible for nitrate assimilation seems to be the same in both prokaryotes and eukaryotes.
Meyer, C., Stitt, M.
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Reductive activation of nitrate reductases

Dalton Transactions, 2005
Protein film voltammetry of Paracoccus pantotrophus respiratory nitrate reductase (NarGH) and Synechococcus elongatus assimilatory nitrate reductase (NarB) shows that reductive activation of these enzymes may be required before steady state catalysis is observed.
Field, Sarah J., Thornton, Nicholas P., Anderson, Lee J., Gates, Andrew J., Reilly, Ann, Jepson, Brian J. N., Richardson, David J., George, Simon J., Cheesman, Myles R., Butt, Julea N.   +9 more
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Nitrate Reduction in the Presence of Wüstite

Journal of Environmental Quality, 2005
ABSTRACTRecent strategies to reduce elevated nitrate NO3− concentrations employ metallic Fe0 as a reductant. Secondary products of Fe0 corrosion include magnetite (Fe3O4), green rust [Fe6(OH)12SO4], and wüstite [FeO(s)]. To our knowledge, no studies have been reported on the reactivity of NO3− with FeO(s).
Sudipta, Rakshit, Christopher J, Matocha, Gerald R, Haszler   +2 more
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Electrocatalytic reduction of nitrate in water

Water Research, 2003
Nitrate (NO(3)(-)) contamination of groundwater is a common problem throughout intensive agricultural areas (nonpoint source pollution). Current processes (e.g., ion exchange, membrane separation) for NO(3)(-) removal have various disadvantages. The objective of this study was to evaluate an electrocatalytic reduction process to selectively remove NO(3)
J W, Peel, K J, Reddy, B P, Sullivan, J M, Bowen   +3 more
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Nitrate reduction in the genusChromobacterium

Antonie van Leeuwenhoek, 1956
Whether or not a strain ofChromobacterium is able to reduce nitrate completely depends upon the oxygen tension of the medium, the composition of the medium and the length of time the culture is incubated. Based upon action on nitrate only, the genus may be divided into three parts: those which reduce completely with or without gas production, those ...
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On the photochemical reduction of nitrate by algae

Biochimica et Biophysica Acta, 1953
At high light intensity suspensions of Chlorella pyrenoidosa, supplied with non-limiting concentrations of CO2, produce oxygen at a greater rate when nitrate is simultaneously present. In that case the photosynthetic quotient, CO2/O2, is considerably lower than in the absence of nitrate, even though the rate of CO2 assimilation is not reduced.
C B, VAN NIEL, M B, ALLEN, B E, WRIGHT
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Mechanism of nitrate reduction in Chlorella

Biochemical and Biophysical Research Communications, 1969
Abstract In Chlorella , the reduction of nitrate to ammonia takes place in two independent enzymatic steps: 1) the reduction of nitrate to nitrite, involving 2 electrons, catalyzed by NADH-nitrate reductase and 2) the reduction of nitrite to ammonia, involving 6 electrons, catalyzed by ferredoxin-nitrite reductase.
W G, Zumft, A, Paneque, P J, Aparicio, M, Losada   +3 more
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The Assimilatory Reduction of Nitrate

1981
Nitrate reduction by algae and higher plants is one of the most fundamental biological processes by which inorganic oxidized nitrogen is reduced to ammonia with water as the ultimate reductant at the expense of sun energy (Losada and Guerrero, 1979). With the exception of some blue–green algae, and plants that have a symbiotic association with nitrogen-
M. Losada, M. G. Guerrero, J. M. Vega
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Reduction of Nitrate and Nitrite

1979
For most plants in their natural environment, nitrate is the immediate source of nitrogen. This nitrate must be converted to ammonia before it is combined with carbon compounds to form the various nitrogenous components of the cell. Since the nitrogen of nitrate has a formal charge of +5, whereas the nitrogen of ammonia has a formal charge of −3, an 8 ...
B. Vennesland, M. G. Guerrero
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