Sabiia Seb
PortuguêsEspañolEnglish
Embrapa
        Busca avançada

Botão Atualizar


Botão Atualizar

Ordenar por: RelevânciaAutorTítuloAnoImprime registros no formato resumido
Registros recuperados: 12
Primeira ... 1 ... Última
Imagem não selecionada

Imprime registro no formato completo
An Intercomparison Study of the Germanium Isotope Composition of Geological Reference Materials ArchiMer
Escoube, Raphalle; Rouxel, Olivier; Luais, Beatrice; Ponzevera, Emmanuel; Donard, Olivier F. X..
Recent analytical developments in germanium stable isotope determination by multicollector ICP-MS have provided new perspectives for the use of Ge isotopes as geochemical tracers. Here, we report the germanium isotope composition of the NIST SRM 3120a elemental reference solution that has been calibrated relative to internal isotopic standard solutions used in the previous studies. We also intercalibrate several geological reference materials as well as geological and meteoritic samples using different techniques, including online hydride generation and a spray chamber for sample introduction to MC-ICP-MS, and different approaches for mass bias corrections such as samplecalibrator bracketing, external mass bias correction using Ga isotopes and double-spike...
Tipo: Text Palavras-chave: Germanium; Isotope; Intercalibration; Reference materials; Germanium; Isotope; Intercalibration; Materiaux de reference.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00089/20036/21743.pdf
Imagem não selecionada

Imprime registro no formato completo
Editorial: Biogeochemistry and Genomics of Silicification and Silicifiers ArchiMer
Moriceau, Brivaela; Gehlen, Marion; Treguer, Paul; Baines, Stephen; Livage, Jacques; Andre, Luc.
Tipo: Text Palavras-chave: Silicon cycle; Biogenic silica; Diatom; Isotope; Bolidophycae; Sponge (Porifera); Nanostructured silica; Anthropogenic pressure.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00488/59978/63223.pdf
Imagem não selecionada

Imprime registro no formato completo
Effects of Transplanting Time on 15-Nitrogen Utilization and Industrial Quality of Flue-Cured Tobacco Rev. Bras. Ciênc. Solo
Xie,Zhijian; He,Yaqin; Xu,Changxu; Tu,Shuxin.
Abstract Nicotine concentration is a key index and directly affects the industrial quality and availability of flue-cured tobacco (FCT). Seedlings transplanted at different times were subjected to different climatic conditions, which were closely correlated with the growth, development, and nicotine synthesis of FCT. An appropriate transplanting time is imperative for ensuring high-quality tobaccos. Hence, a 15N tracing experiment in the field (which included three treatments: FCT seedlings transplanted on 5th, 15th, and 25th May) was carried out to evaluate the influence of different transplanting dates on 15N utilization and nicotine concentration in FCT leaves. Results showed that compared to the tobacco seedlings transplanted on 5th May, the seedlings...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cash crop; Agronomy measurement; Nicotine; Nutrient use efficiency; Isotope.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832017000100534
Imagem não selecionada

Imprime registro no formato completo
First record of Siganus randalli (Teleost, Siganidae) in New Caledonia, and comments on its diet ArchiMer
Moleana, Thibaud; Della Patrona, Luc; Meziane, Tarik; Letourneur, Yves.
Background Most of the 29 Siganidae species are widely distributed through the Indo-Pacific area. In New Caledonia, these family was represented by 12 species. The present report is the first record of Siganus randalli in New Caledonian waters and provide information on its diet. Methods Three specimens of Siganus randalli were caught in shallow mangrove waters of the southern part of New Caledonia. Their stomach contents and isotopic signatures (carbon and nitrogen) were analyzed and compared to others siganids species. Results and conclusion This note provides the most southerly record of the rabbitfish Siganus randalli, which extends its distribution range by 1200 km southward and 1300 km southwest. The data on its diet, when compared with other...
Tipo: Text Palavras-chave: Variegated rabbitfish; Diet; Stomach content; Isotope; SW pacific.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00350/46161/45859.pdf
Imagem não selecionada

Imprime registro no formato completo
Importance and future of individual markers for the ecosystem approach to fisheries ArchiMer
Fromentin, Jean-marc; Ernande, Bruno; Fablet, Ronan; De Pontual, Helene.
The use of genetic, biochemical and electronic markers in population biology and ecology has been growing tremendously during the last two decades. The first part of this paper aims at reviewing the main principles and advances of these individual markers through a few key applications on exploited marine fish populations. The second part is more prospective and investigates some possibilities that could arise in the near future through: (i) the development of new markers, (ii) the combination of different markers and (iii) the combination of quantitative approaches-whether classical or new-with individual markers. It is finally stressed how crucial individual markers will be to unravel the biocomplexity of wild fish populations and the key role they...
Tipo: Text Palavras-chave: Genetic marker; Biochemical marker; Electronic tag; Otolith; Isotope; Population structure; Statistical and mechanistic model; Fisheries.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/00000/11163/7522.pdf
Imagem não selecionada

Imprime registro no formato completo
Isotope analysis (δ13C) of pulpy whole apple juice Ciênc. Tecnol. Aliment.
Figueira,Ricardo; Venturini Filho,Waldemar Gastoni; Ducatti,Carlos; Nogueira,Andressa Milene Parente.
The objectives of this study were to develop the method of isotope analysis to quantify the carbon of C3 photosynthetic cycle in pulpy whole apple juice and to measure the legal limits based on Brazilian legislation in order to identify the beverages that do not conform to the Ministry of Agriculture, Livestock and Food Supply (MAPA). This beverage was produced in a laboratory according to the Brazilian law. Pulpy juices adulterated by the addition of sugarcane were also produced. The isotope analyses measured the relative isotope enrichment of the juices, their pulpy fractions (internal standard) and purified sugar. From those results, the quantity of C3 source was estimated by means of the isotope dilution equation. To determine the existence of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Internal standard; Isotope; Carbon; IRMS; Adulteration; Quality.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612011000300017
Imagem não selecionada

Imprime registro no formato completo
Nickel isotope fractionation during laterite Ni ore smelting and refining: implications for tracing the sources of Ni in smelter-affected soils ArchiMer
Ratie, G.; Quantin, C.; Jouvin, D.; Calmels, D.; Ettler, V.; Sivry, Y.; Cruz Vieira, L.; Ponzevera, Emmanuel; Garnier, J..
Nickel isotope ratios were measured in ores, fly ash, slags and FeNi samples from two metallurgical plants located in the Goiás State, Brazil (Barro Alto, Niquelândia). This allowed investigating the mass-dependent fractionation of Ni isotopes during the Ni-laterite ore smelting and refining. Feeding material exhibits a large range of δ60Ni values (from 0.02 ± 0.10 ‰ to 0.20 ± 0.05 ‰, n=7), explained by the diversity of Ni-bearing phases, and the average of δ60Nifeeding materials was found equal to 0.08 ± 0.08‰ (2SD, n=7). Both δ60Ni values of fly ash (δ60Ni = 0.07 ± 0.07‰, n=10) and final FeNi produced (0.05 ± 0.02 ‰, n=2) were not significantly different from the feeding materials ones. These values are consistent with the very high production yield of...
Tipo: Text Palavras-chave: Nickel; Isotope; Smelting; Refining; Source; Soil.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00278/38961/37501.pdf
Imagem não selecionada

Imprime registro no formato completo
Nickel isotope fractionation during tropical weathering of ultramafic rocks ArchiMer
Ratie, G.; Jouvin, D.; Garnier, Julien; Rouxel, Olivier; Miska, S.; Guimaraes, E.; Cruz Vieira, L.; Sivry, Y.; Zelano, I.; Montarges-pelletier, E.; Thil, F.; Quantin, C..
Although Ni isotopes have been shown to be significantly fractionated in terrestrial samples, their use in continental environmental studies has not yet been evaluated. The present study focuses on an ultramafic (UM) massif (Barro Alto, Goias, Brazil) because such areas are naturally rich in Ni. We present developed lateritic weathering profiles. The goal of the study is to evaluate the potential of using Ni isotopes in environmental continental studies by combining its isotopic signature with mineralogy, in order to better understand the geochemical cycling of Ni in UM settings during weathering. As such, Ni isotope values were measured in samples from the Barro Alto UM complex in the main stages of the lateritic weathering profile of UM rocks, including...
Tipo: Text Palavras-chave: Nickel; Isotope; Weathering; Mineralogy; Soil.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00254/36553/35098.pdf
Imagem não selecionada

Imprime registro no formato completo
Réseau trophique de l'anse de l'Aiguillon : dynamique et structure spatiale de la macrofaune et des limicoles hivernants ArchiMer
Degre, Delphine.
The Aiguillon Cove has been preserved as Natural Reserves since 1996 and 1999 for its international importance as wintering areas for waterbirds. The benthic communities of this a macrotidal bay were still little studied. In order to understand the spatial pattern and the dynamics of the main compartments of its trophic network, two cartographies were carried out at the time of the departure (March) and the arrival (October) of the waders. A monthly study was carried out too in three stations of the upper mudflat. The spatio-temporal homogeneity of the granulometry of the sediments and the strong seasonal variation of the salinity of pore water were highlighted. The molluscs' diversity is low, especially on the upper mudflat where abundance of Hydrobia...
Tipo: Text Palavras-chave: Carrying capacity; Inverse analysis; Spatio temporal patterns; Food web; Isotope; Waders; Molluscs bivalves; Aiguillon Cove; Capacité d'accueil; Analyse inverse; Dynamique des populations; Structure spatiale; Réseau trophique; Isotope; Limicoles; Bivalves; Mollusques; Anse de l'Aiguillon.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/these-2097.pdf
Imagem não selecionada

Imprime registro no formato completo
Shell of the Great Scallop Pecten maximus as a high-frequency archive of paleoenvironmental changes - art. no. Q08001 ArchiMer
Chauvaud, Laurent; Lorrain, Anne; Dunbar, Robert; Paulet, Yves; Thouzeau, Gérard; Jean, Frédéric; Guarini, Jean-marc; Mucciarone, David.
We investigate the environmental and biological controls on oxygen isotope ratios in the shells of modern Pecten maximus bivalves collected alive in the Bay of Brest (France). Seasonal delta(18)O profiles, obtained by drilling the daily calcite ridges deposited at the surface of the left valve, were compared with in situ measurements of temperature and salinity. We show that P. maximus delta(18)O values accurately track seasonal variations in bottom water temperature. Shell growth rate has no significant effect on shell delta(18)O values. Our study demonstrates that daily variations in water temperature can be reconstructed within about 0.5 degrees C. Temperatures estimated with the paleotemperature equation established in this study were compared with...
Tipo: Text Palavras-chave: Pecten Maximus; Brittany; Paleoenvironment; Estimation; Daily varition; Water temperature; Isotope; Calcite; Shell; Ëecten maximus; Paleotempérature; Variation saisonnière; Température eau; Strie croissance; Isotope; Coquille.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/publication-643.pdf
Imagem não selecionada

Imprime registro no formato completo
Stable oxygen and hydrogen isotopic tracers in Amazon shelf waters during Amasseds ArchiMer
Karr, Jd; Showers, Wj.
A detailed hydrographic survey of the water column of the Amazon shelf was performed using stable oxygen and hydrogen isotopes to determine the source and fate of waters on the shelf. delta(18)O-H2O and deltaD measurements were made on water column samples from approximately 60 stations (three depths per station) which were each collected during four Amasseds (A Multidisciplinary Amazon Shelf SEDiment Study) cruises: I8909-August 1989, falling river discharge; I9002-March 1990, rising river discharge; I9004-May 1990, peak discharge: I9113-November 1991, minimum discharge. Isotopes were compared with salinity and temperature measurements in order to identify water masses and mixing. The characteristics (salinity, temperature, delta(18)O, deltaD and d) are...
Tipo: Text Palavras-chave: Amazone; Isotopes; 18O; Deutérium; Hydrologie; Amazon; Isotope; O-18; Deuterium; Hydrography.
Ano: 2002 URL: http://archimer.ifremer.fr/doc/00322/43321/42933.pdf
Imagem não selecionada

Imprime registro no formato completo
The behavior of nickel isotopes at the biogeochemical interface between ultramafic soils and Ni accumulator species ArchiMer
Ratie, G.; Quantin, C.; Maia De Freitas, A.; Echevarria, G.; Ponzevera, Emmanuel; Garnier, J..
Ultramafic derived soils are characterized by low nutrient soils, a low Ca:Mg ratio, and high metal contents such as Ni, Co and Cr. The vegetation growing on these soils is highly adapted and includes both Ni hyperaccumulator and accumulator species. Today, approximately 530 Ni hyperaccumulator species are listed worldwide and the Ni concentration can be extremely high, e.g. up to 25% in latex from Pycnandra acuminata (Sapotaceae), a tree found in New Caledonia. The aim of this study is to identify the potential role of Ni hyperaccumulator plants in the Ni biogeochemical cycle at the soil surface by using Ni isotopes. A set of Ni hyperaccumulator and Ni accumulator plants as well as topsoils were sampled on the Barro Alto and Niquelândia ultramafic...
Tipo: Text Palavras-chave: Nickel; Isotope; Ni hyperaccumulator species; Ultramafic environment.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00464/57565/59740.pdf
Registros recuperados: 12
Primeira ... 1 ... Última
 

Empresa Brasileira de Pesquisa Agropecuária - Embrapa
Todos os direitos reservados, conforme Lei n° 9.610
Política de Privacidade
Área restrita

Embrapa
Parque Estação Biológica - PqEB s/n°
Brasília, DF - Brasil - CEP 70770-901
Fone: (61) 3448-4433 - Fax: (61) 3448-4890 / 3448-4891 SAC: https://www.embrapa.br/fale-conosco

Valid HTML 4.01 Transitional