Time-course of dinitrogen fixation of promiscuous soybean cultivars measured by the isotope dilution method

1999 ◽  
Vol 30 (3) ◽  
pp. 187-192 ◽  
Author(s):  
R. C. Abaidoo ◽  
K. E. Dashiell ◽  
N. Sanginga ◽  
H. H. Keyser ◽  
P. W. Singleton
Keyword(s):  
Isotope Dilution ◽  
Time Course ◽  
Dinitrogen Fixation ◽  
Isotope Dilution Method ◽  
Dilution Method ◽  
Soybean Cultivars ◽  
Promiscuous Soybean

15N-Isotope dilution as a measure of dinitrogen fixation by Azospirillum brasilense associated with maize

1980 ◽  
Vol 58 (1) ◽  
pp. 21-24 ◽  
Author(s):  
R. J. Rennie
Keyword(s):  
Isotope Dilution ◽  
Azospirillum Brasilense ◽  
Dinitrogen Fixation ◽  
Isotope Dilution Method ◽  
Dilution Method ◽  
15N Isotope Dilution ◽  
Fixed Nitrogen ◽  
15N Isotope ◽  
Maize Rhizosphere

The classical difference method (based on Kjeldahl determinations) and the 15N-isotope dilution method to measure dinitrogen fixation by Azospirillum brasilense associated with maize in vitro were compared. Both methods resulted in an accurate measure of the amount of Azospirilluin-fixed nitrogen found in the maize plant; 12.6% of the maize nitrogen was derived from the atmosphere. When sucrose, malate, or succinate was added as a carbon source to encourage dinitrogen fixation in the maize rhizosphere, atmosphere-derived nitrogen in the maize increased to 19.0, 28.0, and 38.0% of the total nitrogen (the remainder coming from seed nitrogen).

ON THE VALUE OF SOME PARAMETERS OF ADRENOCORTICAL GLUCOCORTICOID FUNCTION

1963 ◽  
Vol 44 (4) ◽  
pp. 499-504 ◽  
Author(s):  
M. Van Der Straeten ◽  
A. Vermeulen ◽  
N. Orie ◽  
P. Regniers
Keyword(s):  
Urinary Excretion ◽  
Adrenal Cortex ◽  
Isotope Dilution ◽  
Isotope Dilution Method ◽  
Dilution Method ◽  
Steroid Excretion ◽  
Colorimetric Methods

ABSTRACT The authors studied the correlation between cortisol production, as measured by an isotope dilution method, and the urinary excretion of total and free Porter-Silber chromogens, as well as of 17-ketogenic steroids. Although a significant correlation exists between total Porter-Silber chromogens, 17-ketogenic steroid excretion and cortisol production, discrepancies are occasionally observed. Hence, different colorimetric methods should be used to assess the glucocorticoid activity of the adrenal cortex.

Quality criteria for the isotope dilution method with HRGC/MS

1996 ◽  
Vol 354 (7-8) ◽  
pp. 818-822 ◽  
Author(s):  
B. Henkelmann ◽  
K. -W. Schramm ◽  
C. Klimm ◽  
A. Kettrup
Keyword(s):  
Isotope Dilution ◽  
Quality Criteria ◽  
Isotope Dilution Method ◽  
Dilution Method
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