Isotope Ratio
Mostrando 1-12 de 111 artigos, teses e dissertações.
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1. Geochemical Investigation of Tar Balls Collected in a Brazilian Beach Using Biomarkers, Ni/V, δ13C Ratios and Ultra-High Resolution FT-ICR Mass Spectrometry
Representative tar balls collected in two distinct years (2012 and 2014) in a beach along the State of Bahia, northeastern Brazil, were geochemically characterized in order to identify correlations between them and investigate potential sources. Terpanes and steranes biomarkers (detected by gas chromatography coupled to mass spectrometry, GC-MS), carbon stab
J. Braz. Chem. Soc.. Publicado em: 2020-04
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2. Traceability of animal protein byproducts in ruminants by multivariate analysis of isotope ratio mass spectrometry to prevent transmission of prion diseases
Abstract Background: Ruminant feed containing animal byproduct proteins (ABPs) is prohibited in many countries due to its risk of transmitting prion diseases (PD). In most cases the entire herd is sacrificed, which causes great harm to the producer countries by preventing their exportation of ruminant derived-products. Methods: We used stable isotope ratio
J. Venom. Anim. Toxins incl. Trop. Dis. Publicado em: 13/05/2019
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3. Use of stable isotopes of carbon to detect coconut water adulteration
ABSTRACT: Industrialized coconut water may have been adulterated by adding sugar above the limit permitted by law. According to Brazilian law, industrialized coconut water can receive the maximum addition of 1 g of sugar per 100 mL of the drink. This work aimed to detect adulteration in industrialized coconut water produced in Brazil and measure the relative
Sci. agric. (Piracicaba, Braz.). Publicado em: 2019-05
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4. Timing carbon turnover (δ13C) in weaned piglet’s brain by IRMS
Abstract Isotope-ratio mass spectrometry (IRMS) is a potential tool that provides time-integrated estimate of assimilated and not just ingested nutrients. This feature turned possible its application to evaluate the effects of dietary nucleotides and glutamate on carbon turnover (δ13C) in the brain of weanling piglets. Eighty-seven piglets weaned at 21-day-
An. Acad. Bras. Ciênc.. Publicado em: 26/07/2018
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5. Relationships of stable isotopes, water-rock interaction and salinization in fractured aquifers, Petrolina region, Pernambuco State, Brazil
Abstract The Petrolina County, Pernambuco State, Brazil, presents specificities that make it unique from a hydrogeological point of view. Water resource scarcity is both a quantitative and qualitative issue. The climate is classified as semiarid, having low precipitation, along with high temperatures and evapotranspiration rates. Aquifer zones are related to
REM, Int. Eng. J.. Publicado em: 2018-03
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6. Exploratory Analysis of Sparkling Wines Based in the Combined Data of Stable Isotope Analysis with Physicochemical Variables and Volatile Profile
This work performs an exploratory analysis of the sparkling wines from the state of Rio Grande do Sul, Brazil. Samples of traditional sparkling wine and Moscatel sparkling wine were analyzed and chemometrics tools were applied to physicochemical, gas chromatography and stable carbon isotope analysis. The carbon isotope ratio (δ13C-CO2) of the samples presen
J. Braz. Chem. Soc.. Publicado em: 2017-08
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7. Abundância isotópica do 13C e contribuição da biomassa de eucalipto na conversão da matéria orgânica do solo
RESUMO: A avaliação da conversão da matéria orgânica do solo (MOS) entre pastagens e cultivos arbóreos, tornou-se possível graças a diferença entre os ciclos fotossintéticos do eucalipto (C3) e da maioria das gramíneas (C4). Com o autoanalisador acoplado ao IRMS (isotope ratio mass spectrometer) e a avaliação da abundância isotópica de 13C, o
Cienc. Rural. Publicado em: 06/03/2017
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8. Ion Exchange Chromatography and Mass Bias Correction for Accurate and Precise Zn Isotope Ratio Measurements in Environmental Reference Materials by MC-ICP-MS
Precise and accurate d66/64Zn data for environmental reference materials (RMs) including rocks, sediments, soils and plants are presented in order to improve the metrological traceability and analytical control of Zn isotope ratio determinations in future environmental studies. Previously developed ion exchange chromatography protocols were adjusted to enabl
J. Braz. Chem. Soc.. Publicado em: 2017-02
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9. Differentiation Among Brazilian Wine Regions Based on Lead Isotopic Data
For the first time, the isotope ratio of lead is reported in Brazilian red wines. The lead concentration and the ratios of 204Pb/206Pb, 207Pb/206Pb and 208Pb/206Pb were determined in 94 red wines produced in Campanha Gaúcha, Serra Gaúcha, Vale dos Vinhedos in Southern Brazil and Vale do São Francisco in Northeastern Brazil. The values observed for the iso
J. Braz. Chem. Soc.. Publicado em: 2016-06
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10. Determination of Boron Isotope Ratios in Tooth Enamel by Inductively Coupled Plasma Mass Spectrometry (ICP-MS) After Matrix Separation by Ion Exchange Chromatography
Boron isotopes in teeth has been a new proxy for dietary reconstructions and its resistance to diagenetic alteration. In this study a method using inductively coupled plasma source mass spectrometry (ICP-MS) for the measurement of boron isotope ratio in human dental enamel has been developed. Human dental enamel were digested with HNO3-H2O2 in a microwave sy
J. Braz. Chem. Soc.. Publicado em: 2015-05
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11. Galactose oxidation using 13C in healthy and galactosemic children
Galactosemia is an inborn error of galactose metabolism that occurs mainly as the outcome of galactose-1-phosphate uridyltransferase (GALT) deficiency. The ability to assess galactose oxidation following administration of a galactose-labeled isotope (1-13C-galactose) allows the determination of galactose metabolism in a practical manner. We aimed to assess t
Braz J Med Biol Res. Publicado em: 20/01/2015
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12. Does the rattle of Crotalus durissus terrificus reveal its dietary history?
Background Environmental devastation threatens the survival of many species, including venomous snakes such as the South American rattlesnake Crotalus durissus terrificus. This observation is based on the decrease of snakes collected and donated to Brazilian research institutes. Nevertheless, some individuals have managed to survive and procreate. The ques
J. Venom. Anim. Toxins incl. Trop. Dis. Publicado em: 20/01/2015