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| Silva,Alinne da; Franzini,Vinícius I.; Piccolla,Cristiano D.; Muraoka,Takashi. |
| ABSTRACT The common bean has been considered to have low biological nitrogen fixation capacity; however, this process can be made more effective with molybdenum (Mo) supplementation. The objective of this study was to evaluate the influence of Mo rates on the growth and biological nitrogen fixation by two Brazilian common bean cultivars using the 15N isotope dilution technique. The experiment was performed in 2014 in a completely randomized design arranged in a 5 x 3 factorial scheme, corresponding to 5 rates of Mo (control, 40, 80, 120 and 240 g ha-1), the common bean cultivars Aporé, Ouro Negro and NORH-54 (a non-nodulating common bean cultivar), and three replicates. The application of Mo and the inoculation with rhizobia strains contributed to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Isotope dilution; Labeled fertilizer; Rhizobia. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000200100 |
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| Dias,Raquel Souza; López,Secundino; Borgatti,Laura Maria Oliveira; Kebreab,Ermias; Vitti,Dorinha Miriam Silber Schmidt; Abdalla,Adibe Luiz; Appuhamy,Jayasooriya Arachchige Don Ranga Niroshan; France,James. |
| ABSTRACT: A reliable determination of endogenous phosphorus (P) excretion is required to measure P utilization in chickens accurately. The objective of this study was to investigate phosphorus (P) retention in broilers fed diets formulated with different feed ingredients. Sixty-four 15-d old broiler chicks were fed diets in which part of the dietary P was provided from dicalcium phosphate, maize, barley or soybean. Level of supplementation of each ingredient was calculated to provide two levels of total P (4.5 or 5.0 g kg−1 feed). Birds received a single injection of 3 MBq of 32P to determine endogenous P excretion using the isotope dilution technique. Four days after injection, blood and excreta were collected for analysis of inorganic and radioactive P.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chicken; Endogenous; Isotope dilution; Phosphorus retention. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019000100018 |
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| Guiffard, Ingrid; Geny, Thomas; Veyrand, Bruno; Marchan, Philippe; Grouhel-pellouin, Anne; Bizec, Bruno Le; Bichon, Emmanuelle. |
| The aim of our work was to develop an analytical strategy to quantify naphthalene, acenaphthylene, acenaphthene, fluorene, phenanthrene and anthracene in fish products by on-line dynamic headspace extraction, followed by thermodesorption injection and gas chromatography analysis coupled with tandem mass spectrometry using electron ionization mode (DHS-TD-GC-EI-MS/MS). The developed protocol used 1 g of freeze-dried or oil sample supplemented with perdeuterated light PAHs. The sample was heated at [90 - 100°C], the headspace of the sample was swept by nitrogen and the trapping of the PAHs was carried out on a Tenax-type adsorbent placed at 25°C. Analytes were thermodesorbed at 300°C from the dried adsorbant and then cryofocused on a cooled injection system... |
| Tipo: Text |
Palavras-chave: Light polycyclic aromatic hydrocarbons (PAHs); Dynamic HeadSpace (DHS); Thermo desorption (TDU); GC-MS/MS; Isotope dilution; Seafood. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00604/71629/70076.pdf |
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| Firesinger, Devon Robert. |
| The development of an accurate and precise geochronology is imperative to understanding archives containing information about Earth’s past. Unable to date all intervals of an archive, researchers use methods of interpolation to approximate age between dates. Sections of the radiocarbon calibration curve can induce larger chronological uncertainty independent of instrumental precision, meaning even a precise date may carry inflated error in its calibration to a calendar age. Methods of interpolation range from step-wise linear regression to, most recently, Bayesian statistical models. These employ prior knowledge of accumulation rate to provide a more informed interpolation between neighboring dates. This study uses a Bayesian statistical accumulation model... |
| Tipo: Text |
Palavras-chave: Gas ion source; Accelerator mass spectrometry; Isotope dilution; Foraminifera; Pigmy Basin. |
| Ano: 2017 |
URL: https://archimer.ifremer.fr/doc/00494/60601/64087.pdf |
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| GIOIA,S.M.C.L.; PIMENTEL,M.M.. |
| Nd isotopes represent one of the best tools to investigate the processes involved in the evolution of the continental crust and mantle. This is due mainly to the similar geochemical behaviour of Sm and Nd, both light rare earth elements, which inhibits their fractionation during most varied geological processes. In order to carry out crustal evolution studies in central Brazil, the Sm-Nd isotopic method was implanted at the Geochronology Laboratory of the University of Brasília. The Sm-Nd separation methodology is basically that described in Richard et al. (1976), with the addition of some improvements. In this study we describe in detail the methodology used in Brasília. Precision and accuracy were checked with the international standards such as JB-3,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Sm-Nd method; Isotope dilution; Ion exchange chromatography; TIMS. |
| Ano: 2000 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000200009 |
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