Search results for "Aragon"

showing 10 items of 215 documents

2016

AbstractAuthigenic carbonate build-ups develop at seafloor methane-seeps, where microbially mediated sulphate-dependent anaerobic oxidation of methane facilitates carbonate precipitation. Despite being valuable recorders of past methane seepage events, their role as archives of atmospheric processes has not been examined. Here we show that cyclic sedimentation pulses related to the Indian monsoon in concert with authigenic precipitation of methane-derived aragonite gave rise to a well-laminated carbonate build-up within the oxygen minimum zone off Pakistan (northern Arabian Sea). U–Th dating indicates that the build-up grew during past ~1,130 years, creating an exceptional high-resolution a…

Monsoon of South AsiaMultidisciplinary010504 meteorology & atmospheric sciencesAragoniteGeochemistryAuthigenicengineering.material010502 geochemistry & geophysicsOxygen minimum zone01 natural sciencesSeafloor spreadingchemistry.chemical_compoundchemistry13. Climate actionAnaerobic oxidation of methaneengineeringCarbonate14. Life underwaterPrecipitationGeology0105 earth and related environmental sciencesScientific Reports
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A hydrated crystalline calcium carbonate phase: Calcium carbonate hemihydrate.

2019

Hydrous CaCO 3 gets a new structure Calcium carbonate (CaCO 3 ) forms important minerals on Earth and is a model system for understanding crystal nucleation. Three different structures of CaCO 3 are known, along with two structures that are hydrated. Zou et al. found a third hydrated CaCO 3 structure formed from amorphous CaCO 3 in the presence of magnesium ions. The discovery illustrates the importance of amorphous precursors for producing new materials. Science , this issue p. 396

MultidisciplinaryGeneral Science & TechnologyAragoniteengineering.materialAmorphous calcium carbonateMonohydrocalcitelaw.inventionchemistry.chemical_compoundIkaiteCalcium carbonatechemistryChemical engineeringlawengineeringCrystallizationMagnesium ionBiomineralizationScience (New York, N.Y.)
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Nanostructure, composition and mechanisms of bivalve shell growth

2008

Abstract Freshwater and marine cultured pearls form via identical processes to the shells of bivalves and can therefore serve as models for the biomineralization of bivalve shells in general. Their nanostructure consists of membrane-coated granules (vesicles) which contain amorphous calcium carbonate (ACC) at the beginning of the biomineralization sequence, preceding the crystallization of aragonite and vaterite. In contrast to the commonly accepted view, crystallization of ACC occurs rapidly and within the granular nano-compartments mediated by organic molecules much earlier than platelet formation. The interlamellar organic sheets in nacre that form the platelet structure of nacre themsel…

NanostructureChemistryAragoniteNucleationMineralogy550 - Earth sciencesengineering.materialAmorphous calcium carbonatelaw.inventionchemistry.chemical_compoundChemical engineeringGeochemistry and PetrologylawVateriteengineeringCrystallizationBivalve shellBiomineralization
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Ad Regum Aragonum veterumq comitum depictas effigies, in regia Caesaraugustanensi deputationis aula positas, inscriptiones : quae summa vniuscuiusq. …

1587

Sign.: [calderó]1, 2[calderó]1, 3[calderó]1, 4[calderó]1, A-K4 Les il. són esc. xil. nobiliaris Port. amb esc. xil. d'Aragó. - Text emmarcat

Noblesa aragonesaDIG-BHHeràldica Aragó
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Ad Regum Aragonum veterumq comitum depictas effigies, in regia Caesaraugustanensi deputationis aula positas, inscriptiones : quae summa vniuscuiusq. …

Sign.: [calderó]1, 2[calderó]1, 3[calderó]1, 4[calderó]1, A-K4 Les il. són esc. xil. nobiliaris Port. amb esc. xil. d'Aragó. - Text emmarcat

Noblesa aragonesaHeràldica Aragó
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Seawater carbonate chemistry and nest guarding behaviour of a temperate wrasse

2021

Organisms may respond to changing environmental conditions by adjusting their behaviour (i.e., behavioural plasticity). Ocean acidification (OA), resulting from anthropogenic emissions of carbon dioxide (CO2), is predicted to impair sensory function and behaviour of fish. However, reproductive behaviours, and parental care in particular, and their role in mediating responses to OA are presently overlooked. Here, we assessed whether the nesting male ocellated wrasse Symphodus ocellatus from sites with different CO2 concentrations showed different behaviours during their breeding season. We also investigated potential re-allocation of the time-budget towards different behavioural activities b…

Ocean Acidification International Coordination Centre (OA-ICC)IdentificationPotentiometric titrationRegistration number of speciesSalinityTemperateCalcite saturation statePotentiometricinorganicwaterAlkalinitySiteTemperature waterCarbon inorganic dissolvedUniform resource locator/link to referenceCalculated using seacarb after Nisumaa et al 2010Mediterranean SeaOcean Acidification International Coordination Centre OA ICCAnimaliaAragonite saturation stateBehaviourBicarbonate ionTime in secondsTypeNektonAlkalinity totalChordataCalculated using seacarb after Nisumaa et al. (2010)totalCO2 ventSpeciespHPelagosSymphodus ocellatusTemperatureCarbonate system computation flagdissolvedFugacity of carbon dioxide (water) at sea surface temperature (wet air)Carbonate ionPartial pressure of carbon dioxide (water) at sea surface temperature (wet air)CarbonPartial pressure of carbon dioxide water at sea surface temperature wet airCarbon dioxideSingle speciesEarth System ResearchFugacity of carbon dioxide water at sea surface temperature wet airCoast and continental shelfField observationUniform resource locator link to reference
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Seawater carbonate chemistry and shell mineralogy, microstructure, and mechanical strength of four Mediterranean gastropod species near a CO2 seep

2017

Marine CO2 seeps allow the study of the long-term effects of elevated pCO2 (ocean acidification) on marine invertebrate biomineralization. We investigated the effects of ocean acidification on shell composition and structure in four ecologically important species of Mediterranean gastropods (two limpets, a top-shell snail, and a whelk). Individuals were sampled from three sites near a volcanic CO2 seep off Vulcano Island, Italy. The three sites represented ambient (8.15 pH), moderate (8.03 pH) and low (7.73 pH) seawater mean pH. Shell mineralogy, microstructure, and mechanical strength were examined in all four species. We found that the calcite/aragonite ratio could vary and increased sign…

Ocean Acidification International Coordination Centre (OA-ICC)IdentificationRegistration number of speciesSalinityTemperateinorganicAlkalinityExperimentTemperature waterCarbon inorganic dissolvedCalculated using seacarb after Nisumaa et al 2010Aragonite saturation stateAlkalinity totalSalinity standard errorPatella caeruleatotalCO2 ventpHCalciteTemperaturePartial pressure of carbon dioxide (water) at sea surface temperature (wet air) standard errordissolvedCarbonate ionPartial pressure of carbon dioxide (water) at sea surface temperature (wet air)standard errorEarth System ResearchField observationUniform resource locator link to referencePotentiometric titrationCalcite saturation stateLengthLocationPotentiometricwaterGrowth MorphologyHexaplex trunculusAlkalinity total standard errorBenthosUniform resource locator/link to referenceOsilinus turbinatusOther studied parameter or processMediterranean SeaOcean Acidification International Coordination Centre OA ICCAnimaliaBicarbonate ionTypeTemperature water standard errorCalculated using seacarb after Nisumaa et al. (2010)ForceSpeciespH standard errorCalculated using CO2SYSCarbonate system computation flagFugacity of carbon dioxide (water) at sea surface temperature (wet air)CarbonElasticityTreatmentAragonite saturation state standard errorPartial pressure of carbon dioxide water at sea surface temperature wet airAragoniteCarbon dioxideMolluscaGrowth/MorphologySingle speciesBenthic animalsFugacity of carbon dioxide water at sea surface temperature wet airPatella rusticaToughnessCoast and continental shelf
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Physiological advantages of dwarfing in surviving extinctions in high-CO2 oceans

2015

Excessive CO2 in the present-day ocean-atmosphere system is causing ocean acidification, and is likely to cause a severe biodiversity decline in the future, mirroring effects in many past mass extinctions. Fossil records demonstrate that organisms surviving such events were often smaller than those before, a phenomenon called the Lilliput effect. Here, we show that two gastropod species adapted to acidified seawater at shallow-water CO2 seeps were smaller than those found in normal pH conditions and had higher mass-specific energy consumption but significantly lower whole-animal metabolic energy demand. These physiological changes allowed the animals to maintain calcification and to partial…

Ocean Acidification International Coordination Centre (OA-ICC)IdentificationSalinityTemperateBicarbonate ion standard deviationBottles or small containers/Aquaria (<20 L)Alkalinity total standard deviationinorganicAlkalinityExperimentTemperature waterCarbon inorganic dissolvedWidthCalculated using seacarb after Nisumaa et al 2010Aragonite saturation stateRespiration rate oxygenAlkalinity totalBottles or small containers Aquaria 20 LtotalCO2 ventpHRespirationCalcification rate of calcium carbonateTemperatureMonthdissolvedCarbonate ionLaboratory experimentPartial pressure of carbon dioxide (water) at sea surface temperature (wet air)Temperature water standard deviationRespiration rateEarth System ResearchField observationstandard deviationThicknessCalcification/DissolutionPotentiometric titrationCalcite saturation statePotentiometricwaterPartial pressure of carbon dioxideSiteGrowth MorphologyFigureAragonite saturation state standard deviationBenthosMediterranean SeaOcean Acidification International Coordination Centre OA ICCCalcite saturation state standard deviationAnimaliaBicarbonate ionLONGITUDECalculated using seacarb after Nisumaa et al. (2010)SpeciesCyclope neriteaBottles or small containers/Aquaria (&lt;20 L)Calculated using CO2SYSHeightPartial pressure of carbon dioxide standard deviationCarbonate system computation flagpH standard deviationCarbonate ion standard deviationFugacity of carbon dioxide (water) at sea surface temperature (wet air)CarbonHeight/width ratioTreatmentPartial pressure of carbon dioxide water at sea surface temperature wet airCarbon dioxideMolluscaGrowth/MorphologySingle speciesCalcification DissolutionLATITUDEHeight width ratioBenthic animalsFugacity of carbon dioxide water at sea surface temperature wet airCoast and continental shelfNassarius corniculusoxygenTable
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Seawater carbonate chemistry and biogenic habitat shifts under long-term ocean acidification

2023

Experiments have shown that increasing dissolved CO2 concentrations (i.e. Ocean Acidification, OA) in marine ecosystems may act as nutrient for primary producers (e.g. fleshy algae) or a stressor for calcifying species (e.g., coralline algae, corals, molluscs). For the first time, rapid habitat dominance shifts and altered competitive replacement from a reef-forming to a non-reef-forming biogenic habitat were documented over one-year exposure to low pH/high CO2 through a transplant experiment off Vulcano Island CO2 seeps (NE Sicily, Italy). Ocean acidification decreased vermetid reefs complexity via a reduction in the reef-building species density, boosted canopy macroalgae and led to chang…

Ocean Acidification International Coordination Centre (OA-ICC)IdentificationSalinityTemperateCommunity composition and diversityinorganicAlkalinityDensityType of studyExperimentTemperature waterCarbon inorganic dissolvedAbundanceCalculated using seacarb after Nisumaa et al 2010Aragonite saturation stateAlkalinity totalSalinity standard errortotalCO2 ventpHTemperaturePartial pressure of carbon dioxide (water) at sea surface temperature (wet air) standard errordissolvedCarbonate ionPartial pressure of carbon dioxide (water) at sea surface temperature (wet air)Field experimentstandard errorEarth System ResearchPotentiometric titrationCalcite saturation stateCoveragePotentiometricwaterSiteRocky-shore communityAlkalinity total standard errorBenthosReplicateMediterranean SeaOcean Acidification International Coordination Centre OA ICCBicarbonate ionTemperature water standard errorCalculated using seacarb after Nisumaa et al. (2010)pH standard errorCalculated using CO2SYSCarbonate system computation flagComplexityFugacity of carbon dioxide (water) at sea surface temperature (wet air)CarbonBiomass/Abundance/Elemental compositionAragonite saturation state standard errorPartial pressure of carbon dioxide water at sea surface temperature wet airCarbon dioxideEntire communityRocky shore communityFugacity of carbon dioxide water at sea surface temperature wet airBiomass Abundance Elemental compositionCoast and continental shelfSpecies richness
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The impact of ocean acidification and warming on the skeletal mechanical properties of the sea urchin Paracentrotus lividus from laboratory and field…

2016

Increased atmospheric CO2 concentration is leading to changes in the carbonate chemistry and the temperature of the ocean. The impact of these processes on marine organisms will depend on their ability to cope with those changes, particularly the maintenance of calcium carbonate structures. Both a laboratory experiment (long-term exposure to decreased pH and increased temperature) and collections of individuals from natural environments characterized by low pH levels (individuals from intertidal pools and around a CO2 seep) were here coupled to comprehensively study the impact of near-future conditions of pH and temperature on the mechanical properties of the skeleton of the euechinoid sea …

Ocean Acidification International Coordination Centre (OA-ICC)IdentificationSalinityTemperateinorganicAlkalinityAreaExperimentTemperature waterCarbon inorganic dissolvedCalculated using seacarb after Nisumaa et al 2010Aragonite saturation stateMesocosm or benthocosmAlkalinity totaltotalYoung s moduluspHNorth AtlanticTemperatureProportiondissolvedCarbonate ionLaboratory experimentPartial pressure of carbon dioxide (water) at sea surface temperature (wet air)Earth System ResearchField observationThicknessEchinodermataCalcite saturation stateLengthwaterYoung's modulusGrowth MorphologyBenthosReplicateDiameterHardnessOther studied parameter or processOcean Acidification International Coordination Centre OA ICCAnimaliaBicarbonate ionCalculated using seacarb after Nisumaa et al. (2010)ForceSpeciesHeightTest setCarbonate system computation flagFugacity of carbon dioxide (water) at sea surface temperature (wet air)CarbonTreatmentPartial pressure of carbon dioxide water at sea surface temperature wet airCarbon dioxideParacentrotus lividusGrowth/MorphologySingle speciesBenthic animalsFugacity of carbon dioxide water at sea surface temperature wet airCoast and continental shelfSecond moment of area
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