scholarly journals Inhibition kinetics of nitrate uptake by ammonium in size-fractionated oceanic phytoplankton communities: implications for new production and f-ratio estimates

2008 ◽  
Vol 30 (10) ◽  
pp. 1179-1188 ◽  
Author(s):  
S. L'Helguen ◽  
J.-F. Maguer ◽  
J. Caradec
Keyword(s):  
Nitrate Uptake ◽  
Inhibition Kinetics ◽  
New Production ◽  
Phytoplankton Communities ◽  
Kinetics Of

scholarly journals Variability in Nitrate Uptake Kinetics of Phytoplankton Communities in a Mediterranean Coastal Lagoon

1997 ◽  
Vol 44 (3) ◽  
pp. 369-375 ◽  
Author(s):  
Y. Collos ◽  
A. Vaquer ◽  
B. Bibent ◽  
G. Slawyk ◽  
N. Garcia ◽  
...  
Keyword(s):  
Coastal Lagoon ◽  
Nitrate Uptake ◽  
Uptake Kinetics ◽  
Phytoplankton Communities ◽  
Kinetics Of ◽  
Mediterranean Coastal Lagoon

SUBSTRATE INHIBITION KINETICS OF MALATHION BIODEGRADATION AND THE EFFECT OF MOLASSES AS COSUBSTRATE

2015 ◽  
Vol 14 (1) ◽  
pp. 109-119 ◽  
Author(s):  
Djaber Tazdait ◽  
Nadia Abdi ◽  
Hakim Lounici ◽  
Nabil Mameri
Keyword(s):  
Substrate Inhibition ◽  
Inhibition Kinetics ◽  
Substrate Inhibition Kinetics ◽  
Kinetics Of

scholarly journals Effect of incubation time and substrate concentration on N-uptake rates by phytoplankton in the Bay of Bengal

2005 ◽  
Vol 2 (5) ◽  
pp. 1331-1352
Author(s):  
S. Kumar ◽  
R. Ramesh ◽  
S. Sardesai ◽  
M. S. Sheshshayee
Keyword(s):  
Incubation Time ◽  
Uptake Rate ◽  
Nitrate Uptake ◽  
N Uptake ◽  
Marine Phytoplankton ◽  
Total Production ◽  
New Production ◽  
Urea Uptake ◽  
Uptake Rates

Abstract. We report here the results of three experiments, which are slight variations of the 15N method (JGOFS protocol) for determination of new production. The first two test the effect of (i) duration of incubation time and (ii) concentration of tracer added on the uptake rates of various N-species (nitrate, ammonium and urea) by marine phytoplankton; while the third compares in situ and deck incubations from dawn to dusk. Results indicate that nitrate uptake can be underestimated by experiments where incubation times shorter than 4h or when more than 10% of the ambient concentration of nitrate is added prior to incubation. The f-ratio increases from 0.28 to 0.42 when the incubation time increases from two to four hours. This may be due to the observed increase in the uptake rate of nitrate and decrease in the urea uptake rate. Unlike ammonium [y{=}2.07x{-}0.002\\, (r2=0.55)] and urea uptakes [y{=}1.88x{+}0.004 (r2=0.88)], the nitrate uptake decreases as the concentration of the substrate (x) increases, showing a negative correlation [y{=}-0.76x+0.05 (r2=0.86)], possibly due to production of glutamine, which might suppress nitrate uptake. This leads to decline in the f-ratio from 0.47 to 0.10, when concentration of tracer varies from 0.01 to 0.04μ M. The column integrated total productions are 519 mg C m-2 d-1 and 251 mg C m-2 d-1 for in situ and deck incubations, respectively. The 14C based production at the same location is ~200 mg C m-2 d-1, which is in closer agreement to the 15N based total production measured by deck incubation.

776 MODELING INTERFERON-ALPHA MEDIATED INHIBITION KINETICS OF INTRACELLULAR AND EXTRACELLULAR HCVRNA DURING HCV INFECTION IN VITRO

2011 ◽  
Vol 54 ◽  
pp. S312 ◽  
Author(s):  
H. Dahari ◽  
N. Barretto ◽  
B.J. Sainz ◽  
J. Guedj ◽  
A.S. Perelson ◽  
...  
Keyword(s):  
Interferon Alpha ◽  
Hcv Infection ◽  
Inhibition Kinetics ◽  
Kinetics Of
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