Results 181 to 190 of about 7,838 (225)
Non-canonical reductive nitrous oxide production pathways in a seasonally stratified lake basin
Einzmann T, Lehmann MF, Zopfi J, Frey C.
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Plant and Soil, 2011
Aims In Brazil N fertilization of sugarcane (Saccharum spp.) is low compared to most other countries. 15N-aided studies and the occurrence of many N2-fixing bacteria associated with cane plants suggest significant contributions from biological N2 fixation (BNF). The objective of this study was to evaluate BNF contributions to nine cane varieties under
Amanda Sales Alves +2 more
exaly +2 more sources
Aims In Brazil N fertilization of sugarcane (Saccharum spp.) is low compared to most other countries. 15N-aided studies and the occurrence of many N2-fixing bacteria associated with cane plants suggest significant contributions from biological N2 fixation (BNF). The objective of this study was to evaluate BNF contributions to nine cane varieties under
Amanda Sales Alves +2 more
exaly +2 more sources
Plant and Soil, 1992
In a mass balance of 15N-labelled nitrate added to soil grown with pea or barley, denitrification estimates using the acetylene-inhibition technique were compared with unaccounted for 15N. During the growth season of 1989, which was drier than average, N losses due to denitrification estimated by the acetylene-inhibition technique were negligible.
E S Jensen
exaly +2 more sources
In a mass balance of 15N-labelled nitrate added to soil grown with pea or barley, denitrification estimates using the acetylene-inhibition technique were compared with unaccounted for 15N. During the growth season of 1989, which was drier than average, N losses due to denitrification estimated by the acetylene-inhibition technique were negligible.
E S Jensen
exaly +2 more sources
Clinica Chimica Acta, 1977
Abstract Urinary 15N-balance studies were carried out in 5 endocrinologically normal subjects (aged 6 to 41 years) and in 4 patients with the classic testicular feminization syndrome (TF, aged 10 to 18 years) before and after testosterone administration (6 daily injections of 15 mg/m2).
M, Zachmann +4 more
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Abstract Urinary 15N-balance studies were carried out in 5 endocrinologically normal subjects (aged 6 to 41 years) and in 4 patients with the classic testicular feminization syndrome (TF, aged 10 to 18 years) before and after testosterone administration (6 daily injections of 15 mg/m2).
M, Zachmann +4 more
openaire +2 more sources
The American Journal of Clinical Nutrition, 1994
The validity of tracer-derived estimates of whole-body leucine balance was investigated. Seven healthy young adult subjects received an adequate protein diet for 6 d; at 1800 on the last day, L-[1-13C]leucine and [15N-15N]urea were given as primed, continuous intravenous infusions for 24 h.
A E, el-Khoury +6 more
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The validity of tracer-derived estimates of whole-body leucine balance was investigated. Seven healthy young adult subjects received an adequate protein diet for 6 d; at 1800 on the last day, L-[1-13C]leucine and [15N-15N]urea were given as primed, continuous intravenous infusions for 24 h.
A E, el-Khoury +6 more
openaire +2 more sources
Nitrate removal in two relict oxbow urban wetlands: a 15N mass-balance approach
Biogeochemistry, 2012A 15N-tracer method was used to quantify nitrogen (N) removal processes in two relict oxbow wetlands located adjacent to the Minebank Run restored stream reach in Baltimore County (Maryland, USA) during summer 2009 and early spring 2010. A mass-balance approach was used to directly determine the flow of 15NO3 − to plants, algae, and ...
Melanie D. Harrison +3 more
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Soil Biology and Biochemistry, 1987
A nitrogen balance study was performed on four commercial sugar cane cultivars grown in pots containing 64 kg of soil from a sugar cane growing area, with the objective of quantifying possible contributions of biological nitrogen fixation (BNF) to the plants.
Eduardo Lima +2 more
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A nitrogen balance study was performed on four commercial sugar cane cultivars grown in pots containing 64 kg of soil from a sugar cane growing area, with the objective of quantifying possible contributions of biological nitrogen fixation (BNF) to the plants.
Eduardo Lima +2 more
openaire +1 more source
Australian Journal of Agricultural Research, 1973
Recovery of 15N from labelled fertilizers was measured in open microplots on pastures at three sites in southern Queensland. Very little 15N was recovered from plants growing further than 15-30 cm from the area of application. Most of the 'N found in soil and roots was in the top 15 cm of the profile.
I Vallis, EF Henzell, AE Martin, PJ Ross
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Recovery of 15N from labelled fertilizers was measured in open microplots on pastures at three sites in southern Queensland. Very little 15N was recovered from plants growing further than 15-30 cm from the area of application. Most of the 'N found in soil and roots was in the top 15 cm of the profile.
I Vallis, EF Henzell, AE Martin, PJ Ross
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Naturwissenschaften, 2004
Although stable isotope ratios in animals have often been used as indicators of the trophic level and for the back-calculation of diets, few experiments have been done under standardized laboratory conditions to investigate factors influencing δ15N and δ13C values.
Julia Gaye-Siessegger +3 more
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Although stable isotope ratios in animals have often been used as indicators of the trophic level and for the back-calculation of diets, few experiments have been done under standardized laboratory conditions to investigate factors influencing δ15N and δ13C values.
Julia Gaye-Siessegger +3 more
openaire +1 more source
American Journal of Physiology-Endocrinology and Metabolism, 1990
The role of the splanchnic region (Sp) in whole body leucine metabolism was assessed in six chronically catheterized fasting mongrel dogs and in eight dogs during constant enteral feeding of a complete amino acid solution (0.24 g.kg-1.h-1). We used primed continuous intravenous infusions of L-[1-13C,15N]leucine and L-[1-14C]leucine and measurements of
Y M, Yu +5 more
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The role of the splanchnic region (Sp) in whole body leucine metabolism was assessed in six chronically catheterized fasting mongrel dogs and in eight dogs during constant enteral feeding of a complete amino acid solution (0.24 g.kg-1.h-1). We used primed continuous intravenous infusions of L-[1-13C,15N]leucine and L-[1-14C]leucine and measurements of
Y M, Yu +5 more
openaire +2 more sources