The role of root-associatedKlebsiella pneumoniae in the nitrogen nutrition ofPoa pratensis andTriticum aestivum as estimated by the method of15N isotope dilution

1986 ◽  
Vol 90 (1-3) ◽  
pp. 245-254 ◽  
Author(s):  
Kielo Haahtela ◽  
Kirsti Kari
Keyword(s):  
Isotope Dilution ◽  
Nitrogen Nutrition

Possible Role of Rhizosphere Bacteria in the Nitrogen Nutrition of Ammophila Arenaria

Nature ◽  
1964 ◽  
Vol 202 (4931) ◽  
pp. 467-469 ◽  
Author(s):  
M. G. HASSOUNA ◽  
P. F. WAREING
Keyword(s):  
Nitrogen Nutrition ◽  
Rhizosphere Bacteria ◽  
Ammophila Arenaria

Role of protein phosphatases in the regulation of nitrogen nutrition in plants

2021 ◽  
Author(s):  
Lekshmy Sathee ◽  
G. K. Krishna ◽  
Sandeep B. Adavi ◽  
Shailendra K. Jha ◽  
Vanita Jain
Keyword(s):  
Nitrogen Nutrition ◽  
Protein Phosphatases

The use of the 15N isotope dilution technique to estimate the contribution of associated biological nitrogen fixation to the nitrogen nutrition of Paspalum notatum cv. batatais

1983 ◽  
Vol 29 (8) ◽  
pp. 1036-1045 ◽  
Author(s):  
Robert M. Boddey ◽  
Phillip M. Chalk ◽  
Reynaldo L. Victoria ◽  
Eiichi Matsui ◽  
Johanna Döbereiner
Keyword(s):  
Isotope Dilution ◽  
Nitrogen Nutrition ◽  
Control Plant ◽  
Paspalum Notatum ◽  
Dilution Technique ◽  
N Nutrition ◽  
Advantages And Disadvantages ◽  
Reduction Activity ◽  
Dilution Experiments ◽  
Biological Nitrogen

This paper reports the results of a field experiment to investigate the use of the 15N-dilution technique to measure the contribution of biological N2 fixation to the N nutrition of the batatais cultivar of Paspalum notatum. The pensacola cultivar of this grass supports little associated N2 fixation as evidenced by the low associated C2H2 reduction activity and was thus used as a nonfixing control plant. The grasses were grown in 60-cm diameter concrete cylinders sunk into the soil, and the effects of four different addition rates of labelled nitrogen (NH4)2SO4, were investigated. The data from seven harvests clearly demonstrated that there was a significant input of plant associated N2 fixation to the nutrition of the batatais cultivar amounting to approximately 20 kg N∙ha−1∙year−1. Problems associated with the conduct of such isotope dilution experiments are discussed including the importance of using nonfixing control plants of similar growth habit, the advantages and disadvantages of growing the plants in cylinders as opposed to field plots, and the various methods of application of labelled N fertilizer.

scholarly journals Dual Role of the Oligopeptide Permease Opp3 during Growth of Staphylococcus aureus in Milk

2009 ◽  
Vol 75 (10) ◽  
pp. 3355-3357 ◽  
Author(s):  
Elise Borez�e-Durant ◽  
Aurelia Hiron ◽  
Jean-Christophe Piard ◽  
Vincent Juillard
Keyword(s):  
Staphylococcus Aureus ◽  
Amino Acid ◽  
Nitrogen Nutrition ◽  
Dual Role ◽  
Diauxic Growth ◽  
Extracellular Proteases ◽  
Expression Levels ◽  
Oligopeptide Permease

ABSTRACT Staphylococcus aureus RN6390 presents a diauxic growth in milk, due to amino acid limitation. Inactivation of the oligopeptide permease Opp3 (dedicated to the nitrogen nutrition of the strain) not only affects the growth of the strain but also results in reduced expression levels of three major extracellular proteases.

Evidence for cleavage of [26-14C]cholesterol side-chain by human foetal membranes in vitro

1983 ◽  
Vol 102 (2) ◽  
pp. 288-291 ◽  
Author(s):  
R. Gunasegaram ◽  
A. Loganath ◽  
K. L. Peh ◽  
S. C. Ng ◽  
S. M. M. Karim ◽  
...  
Keyword(s):  
Isotope Dilution ◽  
Strong Evidence ◽  
Side Chain ◽  
Isotope Dilution Analysis ◽  
Spontaneous Labour ◽  
Foetal Membranes

Abstract. With a view to establish the hitherto undescribed role of cholesterol in foetal-membranous steroidogenesis, homogenates of term chorion pars reflexa and amnion pars reflexa and pars placentaris collected from 6 women after spontaneous labour at term (38 to 41 weeks gestation) were incubated with [26-14C]cholesterol. Using reverse-isotope dilution analysis, [14C]isocaproic acid was isolated and characterized. This conversion constitutes strong evidence that C-20, 22-desmolase activity, normally present in the adrenal, gonadal and placental tissues, is present in the homogenates of both membranes. The efficiency of the enzymic conversion suggests that the chorion possesses a more active desmolase system compared to that of the amnion.

scholarly journals Role of nitrate in nitrogen nutrition of the mangrove Avicennia marina

1985 ◽  
Vol 21 ◽  
pp. 259-265 ◽  
Author(s):  
K Boto ◽  
P Saffigna ◽  
B Clough
Keyword(s):  
Nitrogen Nutrition ◽  
Avicennia Marina

scholarly journals Effects of soil acidity on Douglas fir seedlings. 2. The role of pH, aluminium concentration and nitrogen nutrition (pot experiment).

1987 ◽  
Vol 35 (4) ◽  
pp. 537-540
Author(s):  
H.P. Smit ◽  
W.G. Keltjens ◽  
N. van Breemen
Keyword(s):  
Pseudotsuga Menziesii ◽  
Soil Acidity ◽  
Nitrogen Nutrition ◽  
Douglas Fir ◽  
Pot Experiment ◽  
Aluminium Concentration

In greenhouse studies, the growth of 1-yr-old Douglas fir (Pseudotsuga menziesii) seedlings decreased and mortality increased with increasing soil acidity when pH was

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