Results 11 to 20 of about 262,309 (231)
Determination of nitrogen balance in agroecosystems
MethodsX, 2017 Nitrogen balance in agroecosystems provides a quantitative framework of N inputs and outputs and retention in the soil that examines the sustainability of agricultural productivity and soil and environmental quality.
Upendra M. Sainju
doaj +4 more sources
NITROGEN BALANCE ON RICE DIET 1 [PDF]
Journal of Clinical Investigation, 1950 Ernst Peschel, Ruth Lohmann Peschel
openalex +4 more sources
The nitrogen balance of pregnant rats
The Journal of Physiology, 1956 S. D. Morrison
openalex +5 more sources
Problems with nitrogen balance
The American Journal of Clinical Nutrition, 1977 George G. Graham
openalex +4 more sources
Nitrogen balance studies with the milk-fed lamb [PDF]
British Journal of Nutrition, 1964 DM Walker, GJ Faichney
openalex +4 more sources
The Nitrogen Balance of Laying Pullets
Poultry Science, 1937 Abstract RECENT experiments (Prentice, 1933) 1 concerning the protein requirements of laying pullets have demonstrated that under field conditions cereal rations supplemented by 0.5–1.0 percent salt and oyster shell ad libitum gave as good egg production as similar rations containing various levels of protein-rich supplements.
A. J. Macdonald
openalex +3 more sources
The mysteries of nitrogen balance [PDF]
Nutrition Research Reviews, 1999 AbstractThe first part of this review is concerned with the balance between N input and output as urinary urea. I start with some observations on classical biochemical studies of the operation of the urea cycle. According to Krebs, the cycle is instantaneous and automatic, as a result of the irreversibility of the first enzyme, carbamoyl-phosphate ...
openaire +3 more sources
Nitrogen Balance in Radiation Chimeras.
Experimental Biology and Medicine, 1964 SummaryPositive nitrogen balance was observed in mice given 900 r total-body X-irradiation and then treated by injection of living bone marrow cells. The average level was about twice that of normal controls for 90 days after irradiation and bone marrow treatment. Mice given isologous cells showed a normal rate of gain in body weight.
Mc arthur, W H +2 more
openaire +3 more sources
Escape and evolution of Titan's N$_2$ atmosphere constrained by $^{14}$N/$^{15}$N isotope ratios [PDF]
Monthly Notices of the Royal Astronomical Society, 2020, staa3151, 2020 We apply a 1D upper atmosphere model to study thermal escape of nitrogen over Titan's history. Significant thermal escape should have occurred very early for solar EUV fluxes 100 to 400 times higher than today with escape rates as high as $\approx 1.5\times 10^{28}$ s$^{-1}$ and $\approx 4.5\times 10^{29}$ s$^{-1}$, respectively, while today it is ...
arxiv +1 more source