Search results for "Water sample"

showing 10 items of 16 documents

Occurrence and Antimicrobial Resistance of Arcobacter spp. Recovered from Aquatic Environments

2021

Arcobacter spp. are emerging waterborne and foodborne zoonotic pathogens responsible for gastroenteritis in humans. In this work, we evaluated the occurrence and the antimicrobial resistance profile of Arcobacter isolates recovered from different aquatic sources. Besides, we searched for Arcobacter spp. in seaweeds and the corresponding seawater samples. Bacteriological and molecular methods applied to 100 samples led to the isolation of 28 Arcobacter isolates from 27 samples. The highest prevalence was detected in rivers followed by artificial ponds, streams, well waters, and spring waters. Seaweeds contained a higher percentage of Arcobacter than the corresponding seawater samples. The is…

0301 basic medicineMicrobiology (medical)Water samplesVeterinary medicineAntibiotic susceptibilityArcobacter cryaerophilusTetWTetracyclinemedicine.drug_class030106 microbiologyAntibioticsTetOBiochemistryMicrobiologyArticle03 medical and health sciencesAntibiotic resistancemedicinePharmacology (medical)General Pharmacology Toxicology and PharmaceuticsbiologyAquatic ecosystemlcsh:RM1-950Arcobacter butzleri<i>Arcobacter butzleri</i>Multiplex PCRbiology.organism_classificationIsolation (microbiology)Arcobacter butzlerilcsh:Therapeutics. Pharmacology030104 developmental biologyInfectious DiseasesArcobacter<i>tetO</i><i>tetW</i>medicine.drugAntibiotics
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Thermomineral waters of Greece: geochemical characterization

2020

75 °C). In terms of pH most results vary from 5.5 to 823 °C) ii) warm (23 40 °C) iii) thermal (40 75 °C) and iv) hyperthermal (&gtfew springs show either very low pH (&lt10) proposing serpentinization processes. Regarding TDS concentrations collected waters can be subdivided into low salinity (up to 1.5 g/L) brackish (up to 20 g/L) and saline (up to 43 g/L). The medium high salinities can be justified by mixing with sea water and/or strong waterrock interaction processes. Isotope composition of O and H ranges from 12.7 to +2.7 ‰ SMOW and from 91 to +12 ‰ SMOW respectively and is generally comprised between the Global Meteoric Water Line and the East Mediterranean Meteoric Water Line. Only few water samples show a positive shift for δ18O possibly related to high temperature waterrock interaction processes. Carbon dioxide (18 997000 μmol/mol) or N2 (1100 989000 μmol/mol) or CH4 (&ltMany geothermal areas of Greece are located in regions affected by Miocene or Quaternary volcanism and in continental basins characterised by elevated heat flow. Moreover the majority of them is found along the coast as well as in islands of the Aegean Sea and thus thermal water is often brackish to saline due to marine intrusion into costal aquifer. In the present study almost 300 thermal and cold mineral water samples were collected along the Hellenic territory with their physicochemical parameters (temperature pH electrical conductivity and Eh) and the amount of bicarbonates (titration with 0.1N HCl) being determined in situ. Additionally gases found either in free or dissolved phase were sampled. Both water and gas samples were analysed at the INGVPa laboratories for major ions (Ion Chromatography) silica (Inductively Coupled Plasma Optical Emission Spectrometry) chemical composition of free and dissolved gases (Gas Chromatography) water isotopes (O and H) and carbon and helium isotopes of free and dissolved gases (Mass Spectrometry). The temperature of the investigated waters ranges from 6.5 to 98°C pH from 1.96 to 11.98 whilst Total Dissolved Solids (TDS) from 0.06 to 43 g/L. Based on the temperature parameter waters can be divided into four groups: i) cold (&lt0.5 913000 μmol/mol) are the prevailing gas species found in the studied sites. The δ13CCO2 values ranged from 20.1 to +8.5 ‰ whilst the isotope ratio of He from 0.21 to 6.71 R/RA.4) suggesting interaction with H2Srich gases or very high pH values (&gtSettore GEO/08 - Geochimica E Vulcanologia
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Sample Preparation to Determine Pharmaceutical and Personal Care Products in an All-Water Matrix: Solid Phase Extraction

2020

© 2020 by the authors.

ConcentrationWater samplesPharmaceuticals and personal care productsPharmaceutical ScienceSewageReviewCosmeticsWastewater010501 environmental sciences01 natural sciencesEnvironmental impact of pharmaceuticals and personal care productsAnalytical ChemistryAigua AnàlisiTandem Mass SpectrometryDrug DiscoverySample preparationOnlineSolid phase extractionProcess engineeringGroundwaterChromatography High Pressure LiquidSewageDispersive liquid-liquid microextractionSolid Phase ExtractionDisksPharmaceutical PreparationsWastewaterChemistry (miscellaneous)Molecular MedicineEnvironmental MonitoringFarmacologiaLiquid Phase MicroextractionCartridgesSensitivity and SpecificityWater PurificationIsolationlcsh:QD241-441lcsh:Organic chemistryPhysical and Theoretical Chemistry0105 earth and related environmental sciencesSolid-phase extractionbusiness.industry010401 analytical chemistryOrganic ChemistryAnalytical techniqueExtraction (chemistry)Water0104 chemical sciencesEnvironmental sciencebusinessSurface waterWater Pollutants Chemical
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Sample Preparation to Determine Pharmaceutical and Personal Care Products in an All-Water Matrix: Solid Phase Extraction

2020

© 2020 by the authors. Pharmaceuticals and personal care products (PPCPs) are abundantly used by people, and some of them are excreted unaltered or as metabolites through urine, with the sewage being the most important source to their release to the environment. These compounds are in almost all types of water (wastewater, surface water, groundwater, etc.) at concentrations ranging from ng/L to µg/L. The isolation and concentration of the PPCPs from water achieves the appropriate sensitivity. This step is mostly based on solid-phase extraction (SPE) but also includes other approaches (dispersive liquid-liquid microextraction (DLLME), buckypaper, SPE using multicartridges, etc.). In this rev…

DisksConcentrationSolid-phase extractionWater samplesDispersive liquid-liquid microextractionPharmaceuticals and personal care productsOnlineCartridgesIsolation
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High-Performance Liquid Chromatographic Study on Oxidation Products of Lignin and Humic Substances

1991

We describe a convenient method of preparing samples and characterizing the mixture of degradation products obtained from alkaline cupric oxide oxidation of water samples containing lignin and humic substances. The method was applied to one unpolluted humic water sample and a total mill effluent of a kraft pulp mill. The fractions (Mr &amp;gt; 1000) obtained by ultrafi1tration were oxidized and the products (mixtures of degradation products) were analyzed by reversed-phase high-performance liquid chromatography (Spherisorb 5 ODS column). Acetonitrile-0.01 M phosphate buffer (pH 2) was used as the eluent in a gradient system and UV (set at 280 nm) as the detection system. Differences in the …

Environmental EngineeringChromatographyElectrolysis of waterOxidecomplex mixturesWater samplechemistry.chemical_compoundColumn chromatographychemistryKraft processLigninDegradation (geology)EffluentWater Science and TechnologyWater Science and Technology
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A new method to measure the size distribution of insoluble submicron particles in water

1994

Abstract In the atmosphere, cloud and fog droplets usually contain insoluble material. The role of these insoluble particles is still unknown today, and is of interest to study. To determine the size distribution and number concentration of these particles in water, different techniques are available. The instrumentation, however, to measure nanometer-sized particles down to 50 nm diameter is not known. A new instrument, the Liquid Tandem Differential Mobility Analyser (LTDMA), was developed to measure size distributions of insoluble particles in water in the size range 50–300 nm in diameter. The new method is based on nebulising, e.g. cloud water and forming a residue aerosol consisting of…

Fluid Flow and Transfer ProcessesAtmospheric ScienceEnvironmental EngineeringTandemChemistryMechanical EngineeringAnalyserDispersityAnalytical chemistryMineralogyCloud watercomplex mixturesPollutionWater sampleAerosolField campaignJournal of Aerosol Science
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Global distributions of diazotrophs nitrogen fixation rates - Depth integrated values computed from a collection of source datasets - Contribution to…

2013

The MAREDAT atlas covers 11 types of plankton, ranging in size from bacteria to jellyfish. Together, these plankton groups determine the health and productivity of the global ocean and play a vital role in the global carbon cycle. Working within a uniform and consistent spatial and depth grid (map) of the global ocean, the researchers compiled thousands and tens of thousands of data points to identify regions of plankton abundance and scarcity as well as areas of data abundance and scarcity. At many of the grid points, the MAREDAT team accomplished the difficult conversion from abundance (numbers of organisms) to biomass (carbon mass of organisms). The MAREDAT atlas provides an unprecedente…

Go-Flo bottlesSalinityCAIBEX-ITrichodesmium nitrogen fixation rateRV Kilo MoanaUniform resource locator link to source data fileNitrateCTD/RosetteLatitude of eventNiskinAlisRoger A RevelleTemperature waterwhole seawatertop minCalculatedbottom maxareal concentrationNitrogen fixation rateTemperatureDepth top/minCTD RosetteUnicellular cyanobacteria nitrogen fixation rateTrichodesmiumRoger A. RevelleNitrogen fixation rate integrated per dayEarth System ResearchMooring (long time)CAIBEX-IIMARine Ecosystem Model Intercomparison Project MAREMIPDiapalis 3Longitude of eventDiapalis 4Diapalis 5Sample methodIronwaterChlorophyll total areal concentrationBottle NiskinWater pumpMARine Ecosystem Model Intercomparison Project (MAREMIP)PhosphateWater sampleSarmiento de GamboaSample commentCAIBOXDiapalis 6Diapalis 7Uniform resource locator/link to source data fileDiapalis 9Go Flo bottlesNitrogen fixation rate whole seawaterintegrated per dayUnicellular cyanobacteriaDate/Time of eventChlorophyll totalMooring long timeDiapalis-7Diapalis-9Diapalis-3Diapalis-4Diapalis-5Diapalis-6DEPTH waterMP-6BottleDepthEvent labelDate Time of eventCAIBEX IIMeasured at sea surfaceMP-9MP 9MP 6CAIBEX IDepth bottom/maxHeterocyst nitrogen fixation rateHeterocyst
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Global distributions of diazotrophs Gamma-A nifH genes abundance - Depth integrated values computed from a collection of source datasets - Contributi…

2013

The MAREDAT atlas covers 11 types of plankton, ranging in size from bacteria to jellyfish. Together, these plankton groups determine the health and productivity of the global ocean and play a vital role in the global carbon cycle. Working within a uniform and consistent spatial and depth grid (map) of the global ocean, the researchers compiled thousands and tens of thousands of data points to identify regions of plankton abundance and scarcity as well as areas of data abundance and scarcity. At many of the grid points, the MAREDAT team accomplished the difficult conversion from abundance (numbers of organisms) to biomass (carbon mass of organisms). The MAREDAT atlas provides an unprecedente…

M60/5SalinityChlorophyll aDiazotrophs total biomass as carbonUniform resource locator link to source data fileNitrateCTD/RosetteLatitude of eventNiskinM55 1Temperature waterCalothrix abundance expressed in number of nifH gene copiesratio expressed in mass of carbon per amount of nifH gene copiesCalculatedtop minUnicellular cyanobacteria-B biological trait ratio expressed in mass of carbon per amount of nifH gene copiesCD132biomass as carbonTrichodesmium biomass as carbonM55/1bottom maxCTD SeabirdTemperatureDepth top/minCTD RosetteSeabirdRichelia biological trait ratio expressed in mass of carbon per amount of nifH gene copiesCalothrixSO187 2Unicellular cyanobacteria-B abundance expressed in number of nifH gene copiesTrichodesmiumEarth System ResearchMARine Ecosystem Model Intercomparison Project MAREMIPDiazotrophsLongitude of eventRichelia associated speciesSample methodCalothrix biological trait ratio expressed in mass of carbon per amount of nifH gene copiesIronBottle NiskinwaterIn situ pumpMARine Ecosystem Model Intercomparison Project (MAREMIP)Unicellular cyanobacteria-C abundance expressed in number of nifH gene copiesPhosphateWater sampleSample commentUnicellular cyanobacteria biomassUniform resource locator/link to source data filetotal biomass as carbonHeterocyst biomassUnicellular cyanobacteriaProteobacteriaDate/Time of eventMeteor 1986Richelia abundance expressed in number of nifH gene copiesUnicellular cyanobacteria CUnicellular cyanobacteria Bbiological traitSO187/2RicheliaUnicellular cyanobacteria ADEPTH waterbiomassTrichodesmium abundance expressed in number of nifH gene copiesMeteor (1986)BottleDepthEvent labelDate Time of eventTrichodesmium biological trait ratio expressed in mass of carbon per amount of nifH gene copiesUnicellular cyanobacteria-C biological trait ratio expressed in mass of carbon per amount of nifH gene copiesMeasured at sea surfaceCTDCalothrix associated speciesCharles DarwinSonneabundance expressed in number of nifH gene copiesM60 5Depth bottom/maxUnicellular cyanobacteria-A abundance expressed in number of nifH gene copiesassociated speciesProteobacteria abundance expressed in number of nifH gene copiesHeterocyst
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Solid-phase extraction in multi-residue pesticide analysis of water

1993

The determination of pesticides in water is fundamental to the solution of environmental problems as natural waters are usually contaminated with a large number of pesticides. The selection of an isolation and/or concentration technique depends largely on the class of pesticides to be determined. It is often necessary to determine simultaneously a wide variety of compounds in a water sample. Application of solid-phase extraction techniques offers a solution. The mechanisms of solid-phase extraction, types of sorbents and their application to multi-residue pesticide analysis are reviewed.

Multi residueChromatographyChromatographyChemistryNatural waterOrganic ChemistryExtraction (chemistry)Pesticide ResiduesGeneral MedicineContaminationPesticideBiochemistryWater sampleAnalytical ChemistryWater SupplySolid phase extractionWater pollutionWater Pollutants ChemicalJournal of Chromatography A
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Whither the species? Phytophthora taxa, MOTUs and barcodes in the world of metagenomics

2015

The study of ecosystem diversity is being transformed by high throughput sequencing technology that allows an unparalleled depth of sampling of DNA barcode sequences. The opportunities are great at this fascinating interface of pathology, ecology, taxonomy and molecular biology but there are pitfalls. It is important to consider the potential for bias at all steps in the process from sampling through to data analysis. Increasingly Phytophthora diversity is being examined by metabarcoding of the PCR amplified rDNA ITS regions from soil, water or plant sample DNA. We have applied baiting and isolation, cloning and Sanger sequencing and Illumina MiSeq analysis to a time-series of filtered wate…

Phytophthora spp. metabarcoding MiSeq Illumina water samples
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