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| Registros recuperados: 64 | |
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| Kienast, M.; Lehmann, M. F.; Timmermann, A.; Galbraith, E.; Bolliet, T.; Holboum, A.; Normandeau, C.; Laj, C.. |
| Sedimentary delta(15)N records from the oligotrophic western equatorial Pacific (WEP) off Mindanao show that late Holocene sedimentary delta(15)N is substantially lower than that of the early Holocene, following a gradual >3 parts per thousand decrease that occurred between 7 and 3 kyrs ago. Analyses of modem day nitrate isotope profiles from the same region indicate the sensitivity of the WEP N pools towards (1) the advection of (15)N-enriched nitrate from the Eastern Equatorial Pacific (EEP) by the North Equatorial Current (NEC) and the Mindanao Current in subsurface waters and, (2) at shallow depths, the input of new and (15)N-depleted nitrate through N, fixation. We suggest that the Holocene decrease in sedimentary delta(15)N reflects a diminished... |
| Tipo: Text |
Palavras-chave: Tropical Pacific; El Nino; Surface temperature; Fresh water; Nitrate; Mindanao; Ocean; Variability; Holocene; Seawater. |
| Ano: 2008 |
URL: https://archimer.ifremer.fr/doc/00207/31843/30257.pdf |
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| Coverly, Stephen; Kerouel, Roger; Aminot, Alain. |
| Modern instruments together with the use of standard reference materials have improved the accuracy and long-term reproducibility of the analysis of nutrients (ammonium, nitrate, nitrite, phosphate and silicate) in sea water using segmented-flow analysis, so that errors arising from matrix effects become more significant. Colorimetric detectors with bubble-through flowcells have become widely used for seawater analysis in recent years and their associated matrix effects are described. A re-examination of all categories of matrix effects, whose main origin is salinity, was thus undertaken to assess how much they are liable to alter the data. Interferences were classified into four types, each of which was examined in order to show its influence on the... |
| Tipo: Text |
Palavras-chave: Nutrient; Determination; Seawater; Estuarine water; Segmented-flow analysis; Matrix effects. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00057/16843/14530.pdf |
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| Hubert, Francoise; Morga, Benjamin; Renault, Tristan; Le Guyader, Soizick. |
| Aims This study was performed to develop passive sampling methodology for the detection of two viruses in seawater in the area of shellfish production, The Norovirus (NoV), a human pathogen implicated in gastroenteritis outbreaks linked to oyster consumption and the ostreid herpesvirus type 1 (OsHV-1) a virus associated with mass mortalities of Pacific oysters. Methods and Results Commercially membranes were tested for their capacity to adsorb virus: Zetapor, gauze, nylon, low density polyethylene (LDPE) and Polyvinylidene difluoride (PVDF). Laboratory exposures of membranes to contaminated water samples (stool, sewage, seawater) were performed. Our data shown that the amount of NoV GII genome per membrane measured with qRT-PCR increased with the time of... |
| Tipo: Text |
Palavras-chave: Norovirus; OsHV-1; Pacific oysters; Passive samplers; Seawater; Sewage. |
| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00365/47646/47670.pdf |
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| DAWOOD,Mona Gergis; EL-AWADI,Mohamed E. |
| Melatonin is an environmentally friendly-molecule with a potent free radical scavenger and antioxidant capacity. Two pot experiments were conducted during two successive winter seasons (2011/2012 and 2012/2013) at the wire-house of the National Research Centre, Dokki, Cairo, Egypt to study the potentiality of melatonin (100 mM and 500 mM) in alleviating the harmful effect of diluted seawater at a relatively low and high concentrations (3.85 dS/m and 7.69 dS/m, respectively) on the performance of faba bean plants. The results revealed that irrigation of faba bean plants with diluted seawater reduced growth parameters (plant height, leaves number/plant, fresh and dry weights of plant), relative water content (RWC), photosynthetic pigments (chlorophylls a, b... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Indole acetic acid; Legumes; Minerals; N-acetyl-5-methoxytryptamine; Protein patterns; Seawater. |
| Ano: 2015 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2015000200022 |
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| Aminot, Alain; Kerouel, Roger. |
| A segmented flow automated method with on-line photo-oxidation for the determination of dissolved organic phosphorus + soluble reactive phosphorus (DOP + SRP) in seawater and fresh water is described here. A low-power lamp was used for a compact, easy-to-handle and low-ozone-producing manifold. The influence of seawater matrix components was studied in detail using natural seawater and salt solutions spiked with DOP model compounds. Bromide was found to be the most inhibitory species in seawater. The work shows that most salt solutions referred to as artificial seawater are not satisfactory model matrices to test the actual seawater matrix effect. Since DOP recovered in undiluted seawater samples was about half that obtained in fresh water samples, the... |
| Tipo: Text |
Palavras-chave: Measurement; Fresh water; Seawater; Total dissolved phosphorus; Dissolved organic phosphorus. |
| Ano: 2001 |
URL: http://archimer.ifremer.fr/doc/2001/publication-1678.pdf |
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| Paluselli, Andrea. |
| Phthalic Acid Esters (PAEs) are a group of emerging organic contaminants that have become a serious issue because of their ubiquitous presence on the marine environment worldwide and for the endocrine disrupting effects in animals and humans. However, little is known about their distribution in the Ocean, mainly because of analytical difficulties and the high possibility of ambient sample contamination. Plastic debris in marine environment includes resin pellets, macro- and microplastic fragments, and contains additives such as PAEs that might be released in the aquatic environment in unknown proportion. In our work, we improved an analytical method for the determination of 8 PAEs, at trace levels in marine and fresh waters. In the first part of the... |
| Tipo: Text |
Palavras-chave: Phtalates; DEHP; Eau de mer; Perturbateurs endocriniens; Microplastiques; Microplastics; Endocrine disruptors; Seawater; Phthalates; Dehp. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00497/60904/64252.pdf |
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| Donval, Jean-pierre; Guyader, Vivien. |
| “Headspace” technique is one of the methods for the onboard measurement of hydrogen (H2) and methane (CH4) in deep seawater. Based on the principle of an automatic headspace commercial sampler, a specific device has been developed to automatically inject gas samples from 300 ml syringes (gas phase in equilibrium with seawater). As valves, micro pump, oven and detector are independent, a gas chromatograph is not necessary allowing a reduction of the weight and dimensions of the analytical system. The different steps from seawater sampling to gas injection are described. Accuracy of the method is checked by a comparison with the “purge and trap” technique. The detection limit is estimated to 0.3 nM for hydrogen and 0.1 nM for methane which is close to the... |
| Tipo: Text |
Palavras-chave: Gas; Seawater; Headspace method. |
| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00354/46523/46287.pdf |
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| Compere, Chantal. |
| Introduction: Almost all submerged surfaces in the marine environment are subject to developing an organic film, with the exception of some living organisms, such as sponges, which do not undergo any great colonization, for no currently-known scientific reason. The presence of this biofilm is at the source of many problems in the oceanographic field and for marine business. This article introduces some drawbacks relating to the existence of this fouling and elaborates upon the main studies conducted at IFREMER concerning the most-used methods for combating it. However, the anti-fouling agents that are generally used for protecting facilities are toxic and can have disastrous consequences on the marine environment's fauna and flora. Moreover, the use of... |
| Tipo: Text |
Palavras-chave: Biofilm; Seawater. |
| Ano: 1999 |
URL: http://archimer.ifremer.fr/doc/1999/publication-1698.pdf |
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| El Sayed, Mohamed A.; Aminot, Alain. |
| Extractable organic copper using C18 Sep-Pak cartridges was investigated in seawater after laboratory experiment showed that the (C18 Sep-Pak) cartridges were reliable, in open and coastal waters with normal levels of dissolved organic carbon, for the separation of a specific fraction of organo-copper complexes.Given that the Sep-Pak cartridges retain the hydrophobic fraction of the dissolved organic matter, this extraction technique was applied for studying the characteristics of this particular hydrophobic dissolved organic copper fraction (hDOCu) in the north-western Mediterranean waters. Surface distribution of hDOC is influenced by organic matter input from the river Rhone and its estuary as well as the physical processes affecting the primary... |
| Tipo: Text |
Palavras-chave: Mediterranean sea; Seawater; Dissolved organic matter; Copper compounds. |
| Ano: 2000 |
URL: http://archimer.ifremer.fr/doc/2000/publication-1681.pdf |
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| Laguionie, Philippe; Bailly-du-bois, Pascal; Boust, D.; Fievet, B.; Garreau, Pierre; Connan, O.; Charmasson, Sabine; Arnaud, M.; Duffa, Celine; Champion, D.. |
| The accident at the Fukushima Dai-ichi Nuclear Power Plant (FDNPP) in March 2011 led to an unprecedented direct input of artificial radioactivity into the marine environment. The Institute for Radioprotection and Nuclear Safety was requested by the French authorities to investigate the radioecological impact of this input, in particular the potential contamination of products of marine origin used for human consumption. This article describes the close link between the responses provided and the availability of the data, as well as their nature and ability to meet the requirements of expert investigation. These responses were needed: (i) to evaluate the inputs of radionuclides into the marine environment, (ii) to understand their dispersion in seawater,... |
| Tipo: Text |
Palavras-chave: Nuclear power plant; Accident analysis; Seawater; Sediment; Biota. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00096/20690/18353.pdf |
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| Vigneron, Vassilia; Solliec, Gaelle; Montanie, Hélène; Renault, Tristan. |
| Since 1991, herpesvirus infections have been reported among larvae and juveniles of various bivalves. Most of the studies focused on detection of viral infections of economically important species. However, the persistence of bivalve herpesviruses; in the marine environment is poorly documented. The present study concerns the role of seawater parameters in Ostreid Herpesvirus I (OsHV-1) detection by polymerase chain reaction (PCR). Viral DNA extracted from purified particles or virions present in infected oyster larvae were detected by PCR after storage in different media at different temperatures. The lowest detection threshold was found using distilled water or Tris EDTA buffer. In seawater, the threshold was higher. The use of sterile media permitted... |
| Tipo: Text |
Palavras-chave: Temperature; PCR; Detection; Seawater; Viral DNA; Oyster herpesvirus 1. |
| Ano: 2004 |
URL: http://archimer.ifremer.fr/doc/2004/publication-2909.pdf |
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| Vong, Lilita; Laes, Agathe; Blain, Stéphane. |
| A new method for the non-specific determination of iron-porphyrin-like complexes in natural waters has been developed. It is based on the chemiluminescent oxidation of the luminol in the presence of dioxygen (O-2) at pH 13. The method has been implemented in a FIA manifold that allowed the direct injection of seawater. The limit of detection is 0.11 nM of equivalent hemin (Fe-protoporphyrin IX). Fe2+, Fe3+, H2O2, siderophore (deferoxamin mesylate), humic acid and phytic acid did not interfere when the), were present at the concentrations expected in seawater. Metal free porphyrin and Mg, Cu, Co porphyrin complexes did not induce a significant chemiluminescent signal. Poisoned unfiltered samples could be stored for several weeks before analyses. The new... |
| Tipo: Text |
Palavras-chave: Chemiluminescence; Complexation; Flow injection; Seawater; Porphyrin; Iron. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-3298.pdf |
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| Freslon, Nicolas; Bayon, Germain; Birot, Dominique; Bollinger, Claire; Barrat, Jean-alix. |
| This paper reports on a novel procedure for determining trace element abundances (REE and Y, Cr, Mn, Co) in seawater by inductively coupled plasma sector field mass spectrometry (ICP-SFMS). The procedure uses a combination of pre-concentration using co-precipitation onto magnesium hydroxides and addition of thulium spike. The validity of the method was assessed onto 25 ml volumes of certified reference materials (NASS- and CASS-4) and in house seawater standard. Procedural blanks were determined by applying the same procedure to aliquots of seawater previously depleted in trace elements by successive Mg(OH)(2) co-precipitations, yielding estimated contributions to the studied samples better than 1.1% for all elements, with the exception of Cr (<3.3%)... |
| Tipo: Text |
Palavras-chave: Trace elements; Rare earth elements (REE); Seawater; Mg(OH)(2) co-precipitation; ICP-MS; Thulium. |
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00041/15220/15855.pdf |
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| Baconnais, Isabelle; Rouxel, Olivier; Dulaquais, Gabriel; Boye, Marie. |
| A new technique for the determination of dissolved copper isotope composition (δ65Cu) of seawater was applied to examine copper sources and internal cycling in the Mediterranean Sea. A succession of chelating resin with nitrilotriacetic acid functional groups and strong base anion exchange resin, together with optimization of the multi-collector inductively coupled plasma mass spectrometry set-up allowed to isolate copper from seawater matrix and to measure the 65Cu/63Cu ratios in seawater with an external precision of 0.06‰ (2 s.d.). This method was first applied for inter-comparison measurements to surface and deep waters sampled at station BATS in the North Atlantic Ocean. Disparities in δ65Cu reported here and in the literature over these samples... |
| Tipo: Text |
Palavras-chave: Copper isotope; Seawater; Mediterranean Sea; Geotraces; Isotope fractionation. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00457/56880/58742.pdf |
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| Le Menn, Monique; Malardé, Damien; David, Arnaud; Brault, Patrice; Grosso, Philippe; De Bougrenet De La Tocnaye, Jean-louis; Le Reste, Serge; Podeur, Christian. |
| Salinity is the essential parameter for ocean dynamics studies. Its definition and using in the equations used to calculate the thermodynamic properties of seawater, were revised in 2010, opening the possibility of new sensors developments. In this context, NOSS (NKE Optical Salinity Sensor) has emerged as one of the first underwater instrument for in situ refractive index measurement in the past years open up the scope of possibilities to access to density parameter. This achievement is the fruit of the cooperation between several institutions and the fruit of several years of developments and trials. NOSS sensor is designed to be deployed in coastal environment and open-ocean waters up to 2000m, especially on profiling floats of the Argo network. |
| Tipo: Text |
Palavras-chave: Salinity; Density; Ocean; Seawater; Refractive index; Sensor.. |
| Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00664/77601/79616.pdf |
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| Registros recuperados: 64 | |
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