Search results for "echinoderm"

showing 10 items of 85 documents

LATEST CAMBRIAN CORNUTES (ECHINODERMATA: STYLOPHORA) FROM THE TAEBAEKSAN BASIN, KOREA

2005

The oldest echinoderms and first cornute stylophorans ever reported from Korea are described, based on more than 40 specimens collected from the Late Cambrian of the Taebaeksan Basin. New material doubles the number of stylophorans described from Asia and the number of specimens of Late Cambrian stylophorans recorded throughout the world. Three different cornutes are identified: Sokkaejaecystis serrata n. gen. and sp. and two genus and species indeterminate forms A and B. Sokkaejaecystis serrata and indeterminate form B are assigned to the Chauvelicystinae, while the systematic position of indeterminate form A within cornutes is difficult to assess. This new material suggests paleobiogeogra…

MonophylyPaleontologybiologySister groupEchinodermGenusFaunaOrdovicianPaleontologyStylophorabiology.organism_classificationCladisticsJournal of Paleontology
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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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Could the acid-base status of Antarctic sea urchins indicate a better-than-expected resilience to near-future ocean acidification?

2015

Increasing atmospheric carbon dioxide concentration alters the chemistry of the oceans towards more acidic conditions. Polar oceans are particularly affected due to their low temperature, low carbonate content and mixing patterns, for instance upwellings. Calcifying organisms are expected to be highly impacted by the decrease in the oceans' pH and carbonate ions concentration. In particular, sea urchins, members of the phylum Echinodermata, are hypothesized to be at risk due to their high-magnesium calcite skeleton. However, tolerance to ocean acidification in metazoans is first linked to acid-base regulation capacities of the extracellular fluids. No information on this is available to dat…

Ocean Acidification International Coordination Centre (OA-ICC)SalinityNotocidaris gaussensisBicarbonate ion standard deviationinorganicAlkalinity total standard deviationAlkalinityCoulometric titrationExperimentCarbon inorganic dissolvedTemperature waterSizeCoelomic fluidCalculated using seacarb after Nisumaa et al 2010CalculatedAragonite saturation stateCtenocidaris giganteaAlkalinity totaltotalAmphipneustes loriolipHTemperaturedissolvedAcid base regulationCarbonate ionPartial pressure of carbon dioxide (water) at sea surface temperature (wet air)Carbon dioxide standard deviationSterechinus neumayeriEarth System ResearchAporocidaris eltanianaδ13Cstandard deviationField observationPolarStation labelEchinodermataPotentiometric titrationCalcite saturation stateCoelomic fluid alkalinityPotentiometricwaterPartial pressure of carbon dioxideAmphipneustes similisAragonite saturation state standard deviationBenthosDATE TIMEOcean Acidification International Coordination Centre OA ICCSterechinus antarcticusAnimaliaCalcite saturation state standard deviationBicarbonate ionLONGITUDECalculated using seacarb after Nisumaa et al. (2010)SpeciesCalculated using CO2SYScarbonEvent labelPartial pressure of carbon dioxide standard deviationCoelomic fluid carbon inorganic dissolvedCarbonate system computation flagAcid-base regulationpH standard deviationCarbonate ion standard deviationFugacity of carbon dioxide (water) at sea surface temperature (wet air)Amphipneustes rostratusPartial pressure of carbon dioxide water at sea surface temperature wet airDATE/TIMECarbon dioxideDifferenceSingle speciesCoelomic fluid pHLATITUDEFugacity of carbon dioxide water at sea surface temperature wet airAntarcticBenthic animalsCoast and continental shelfAbatus cavernosus
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Ordovician echinoderms from the Tabas and Damghan regions, Iran: palaeobiogeographical implications

2005

Abstract Two echinoderm assemblages are described in the Middle Ordovician of Iran (Darriwilian). The Simeh Kuh section (Damghan area, eastern Alborz range) has yielded a rich and diverse blastozoan fauna consisting of fistuliporite (Echinosphaerites, Heliocrinites) and dichoporite rhombiferans (cheirocrinids indet., hemicosmitids indet.), as well as aristocystitid (Sinocystis) and sphaeronitid diploporites (Glyptosphaerites, Tholocystis). Heliocrinites, cheirocrinids, hemicosmitids, Glyptosphaerites, and Tholocystis are reported for the first time in the Ordovician of Iran. A less diverse assemblage was collected in the Shirgesht section (Tabas area, Derenjal Mountains), and represents the…

PaleontologySouth chinaEchinosphaeritesEchinodermbiologyRange (biology)FaunaOrdovicianGeologyBalticabiology.organism_classificationGeologyTerraneBulletin de la Société Géologique de France
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Palaeogeographical and palaeoecological aspects of the Cambro–Ordovician radiation of echinoderms in Gondwanan Africa and peri-Gondwanan Europe

2003

Abstract Ecology and tempo of the Lower Palaeozoic radiation of echinoderms are discussed in this paper based on comparison of the diversity patterns observed in Cambro–Ordovician faunas from Laurentia and the northern Gondwana margin. The Cambrian ‘agronomic revolution’ triggered a global radiation of echinoderms, with the progressive disappearance of biomat-related lifestyles, and the colonisation of new environments. Both in Laurentia and on the northern Gondwana margin, soft-substrate echinoderm assemblages related to cold and/or deep environments were dominated by blastozoans and stylophorans. These assemblages show a pattern of continuous diversification from the Middle Cambrian to th…

PaleozoicbiologyFaunaPaleontologyOceanographybiology.organism_classificationGondwanaPaleontologyEchinodermPaleoecologyOrdovicianLaurentiaOrdovician radiationEcology Evolution Behavior and SystematicsGeologyEarth-Surface ProcessesPalaeogeography, Palaeoclimatology, Palaeoecology
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Phosphoproteinphosphatase activity in sea urchin embryos

1964

Si e studiata l'attivita fosfoproteinfosfatasica in omogenati totali di uova ed embrioni diParacentrotus lividus e diArbacia lixula. La reazione ha un optimum a pH acido, e stimolata da K+ e Na+ ed e inibita da Ca++ e Mg++. L'attivita enzimatica aumenta tra la fecondazione e lo stadio a 64 blastomeri; in seguito rimane costante fino a blastula con mesenchima; quindi generalmente decresce.

PharmacologyEmbryo NonmammalianCell BiologyAnatomyIn Vitro TechniquesSea urchin embryoBiologyMolecular biologyPhosphoric Monoester HydrolasesCellular and Molecular NeuroscienceProtein BiosynthesisAnimalsChemical PrecipitationMolecular MedicineColorimetryMolecular BiologyEchinodermataExperientia
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Some observations on the metabolism of S35-methionine during development of the sea urchin eggs

1958

Si e studiato il metabolismo della metionina-S35 nella frazione non-proteica (TCA-solubile) nel corso dello sviluppo diParacentrotus lividus.

PharmacologyMethionineMethionine metabolismBiochemical PhenomenaCell BiologyMetabolismBiologyFisheryCellular and Molecular Neurosciencechemistry.chemical_compoundMethionineBiochemistrychemistrySea Urchinsbiology.animalAnimalsMolecular MedicineMolecular BiologySea urchinEchinodermataExperientia
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Incorporation of S35-Methionine in the microsomes and soluble proteins during the early development of the sea urchin egg

1960

Nelle uova diParacentrotus lividus gia pochi minuti dopo la fecondazione si inizia una attiva incorporazione di metionina-S35 nei microsomi e nelle proteine solubili. Si avanza l'ipotesi che cio possa indicare l'iniziarsi molto precoce della sintesi di una o piu proteine.

PharmacologyMethionineMethionine metabolismBiochemical PhenomenaProteinsCell BiologyAnatomyBiologyCellular and Molecular Neurosciencechemistry.chemical_compoundMethioninechemistryBiochemistryMicrosomesSea UrchinsProteins metabolismbiology.animalMicrosomeAnimalsMolecular MedicineMolecular BiologySea urchinEchinodermataExperientia
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A model for the cortical reaction of fertilization in the sea-urchin egg.

1953

Da una soluzione di lipovitellina (la lipoproteina del tuorlo dell'uovo di pollo) trattata con spermi vivi diArbacia lixula si ha liberazione di fosfolipidi. Questo esperimento e considerato un modello della reazione corticale di fecondazione dell'uovo di riccio di mare.

PharmacologybiologyCell BiologyAnatomyCellular and Molecular NeuroscienceHuman fertilizationmedicine.anatomical_structurebiology.animalFertilizationSea UrchinsBotanymedicineMolecular MedicineCortical reactionAnimalsMolecular BiologySea urchinEchinodermataOvumExperientia
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In vitro incorporation of amino acids into proteins stimulated by RNA from unfertilized sea urchin eggs.

1964

PhenylalanineBiophysicsIn Vitro TechniquesBiochemistrybiology.animalAnimalsRNA MessengerMolecular BiologySea urchinOvumchemistry.chemical_classificationAlaninebiologyLysineRNAValineCell BiologyIn vitroAmino acidRatsBiochemistrychemistryLiverFertilizationProtein BiosynthesisRNAFemaleEchinodermataBiochemical and biophysical research communications
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