Search results for "mass [excited state]"

showing 10 items of 5250 documents

Determination of mercury at picogram level in natural waters with inductively coupled plasma mass spectrometry by using 3D printed metal scavengers

2019

The determination of ultra-trace concentrations of Hg in natural water samples via preconcentration using 3D printed metal scavenger technique followed by inductively coupled plasma mass spectrometry (ICP-MS) was developed. The determination of Hg in certified reference material ERM-CA615 (groundwater) was performed with high accuracy and precision resulting in recovery of 100 ± 3% and RSD <2.5%, respectively. Selective laser sintering (SLS) 3D printing was used to fabricate the scavengers using a mixture of polyamide-12 powder with thiol-functionalized silica. The preconcentration procedure is based on the adsorption of Hg on the scavenger and followed by elution of the preconcentrated Hg …

3d printedmercuryelohopeavesichemistry.chemical_element02 engineering and technology01 natural sciencesBiochemistryAnalytical ChemistryMetalpreconcentration3D-tulostushaitalliset aineetEnvironmental Chemistryinductively coupled plasma mass spectrometryInductively coupled plasma mass spectrometrySpectroscopyvesistötNatural waterultra-trace concentration010401 analytical chemistry3D printing021001 nanoscience & nanotechnology0104 chemical sciencesMercury (element)spektrometriaCertified reference materialschemistryEnvironmental chemistryvisual_artvisual_art.visual_art_mediumnatural water0210 nano-technologyGroundwaterAnalytica Chimica Acta
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Varying chiral ratio of Pinic acid enantiomers above the Amazon rainforest

2023

Chiral chemodiversity plays a crucial role in biochemical processes such as insect and plant communication. However, the vast majority of organic aerosol studies do not distinguish between enantiomeric compounds in the particle phase. Here we report chirally specified measurements of secondary organic aerosol (SOA) at the Amazon Tall Tower Observatory (ATTO) at different altitudes during three measurement campaigns at different seasons. Analysis of filter samples by liquid chromatography coupled to mass spectrometry (LC-MS) has shown that the chiral ratio of pinic acid (C9H14O4) varies with increasing height above the canopy. A similar trend was recently observed for the gas-phase precursor…

540 Chemistry and allied sciencesAtmospheric ScienceChemistryPhase (matter)540 ChemieAnalytical chemistryParticleMoleculeDegradation (geology)ParticulatesEnantiomerMass spectrometryAerosol
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Formation of 3-methyl-1,2,3-butanetricarboxylic acid via gas phase oxidation of pinonic acid – a mass spectrometric study of SOA aging

2012

Abstract. This paper presents the results of mass spectrometric investigations of the OH-initiated oxidative aging of α-pinene SOA under simulated tropospheric conditions at the large aerosol chamber facility AIDA, Karlsruhe Institute of Technology. In particular, the OH-initiated oxidation of pure pinic and pinonic acid, two well-known oxidation products of α-pinene, was investigated. Two complementary analytical techniques were used, on-line atmospheric pressure chemical ionization/mass spectrometry (APCI/MS) and filter sampling followed by liquid chromatography/mass spectrometry (LC/ESI-MS). The results show that 3-methyl-1,2,3-butanetricarboxylic acid (MBTCA), a very low volatile α-pine…

540 Chemistry and allied sciencesAtmospheric ScienceChromatographyChemistryAtmospheric-pressure chemical ionizationFraction (chemistry)Mass spectrometryMass spectrometriclcsh:QC1-999JGas phaseAerosollcsh:ChemistryAcid oxidationlcsh:QD1-999540 ChemieYield (chemistry)ddc:550lcsh:PhysicsAtmospheric Chemistry and Physics
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Nanoparticles in the Biological Context: Surface Morphology and Protein Corona Formation

2020

Small 16(39), 2002162 (2020). doi:10.1002/smll.202002162

540 Chemistry and allied sciencesMaterials scienceMorphology (linguistics)Shell (structure)NanoparticleContext (language use)Protein Corona02 engineering and technology010402 general chemistry01 natural sciencesMass SpectrometryBiomaterialsColloidCorona (optical phenomenon)General Materials ScienceBackground subtractionBlood ProteinsGeneral Chemistry021001 nanoscience & nanotechnology5400104 chemical sciencesChemical physics540 Chemieddc:540NanoparticlesProtein Corona0210 nano-technologyBiotechnology
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The maximum carbonyl ratio (MCR) as a new index for the structural classification of secondary organic aerosol components

2021

RATIONALE Organic aerosols (OA) account for a large fraction of atmospheric fine particulate matter and thus are affecting climate and public health. Elucidation of the chemical composition of OA is the key for addressing the role of ambient fine particles at the atmosphere-biosphere interface and mass spectrometry is the main method to achieve this goal. METHODS High-resolution mass spectrometry (HRMS) is on its way to becoming one of the most prominent analytical techniques, also for the analysis of atmospheric aerosols. The combination of high mass resolution and accurate mass determination allows the elemental compositions of numerous compounds to be easily elucidated. Here a new parame…

540 Chemistry and allied sciencesResolution (mass spectrometry)Chemistry010401 analytical chemistryOrganic ChemistryAnalytical chemistryFraction (chemistry)Structural classificationParticulatesOrbitrapMass spectrometry01 natural sciences0104 chemical sciencesAnalytical ChemistryAerosollaw.inventionlaw540 ChemieChemical compositionSpectroscopyRapid Communications in Mass Spectrometry
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Design, characterization, and first field deployment of a novel aircraft-based aerosol mass spectrometer combining the laser ablation and flash vapor…

2021

In this paper, we present the design, development, and characteristics of the novel aerosol mass spectrometer ERICA (ERC Instrument for Chemical composition of Aerosols; ERC – European Research Council) and selected results from the first airborne field deployment. The instrument combines two well-established methods of real-time in situ measurements of fine particle chemical composition. The first method is the laser desorption and ionization technique, or laser ablation technique, for single-particle mass spectrometry (here with a frequency-quadrupled Nd:YAG laser at λ = 266 nm). The second method is a combination of thermal particle desorption, also called flash vaporization, and electro…

624 Civil engineering540 Chemistry and allied sciencesAtmospheric ScienceLaser ablationMaterials sciencebusiness.industry530 Physics624 Ingenieurbau und UmwelttechnikLaserMass spectrometry530 Physik620 Ingenieurwissenschaften und MaschinenbauAerosollaw.inventionOpticslaw540 ChemieVaporization620 Engineering and allied operationsParticleVacuum chamberParticle size600 Technikbusiness600 Technology (Applied sciences)Atmospheric Measurement Techniques
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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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El constitucionalismo democrático y social : orígenes y características distintivas

2020

The paper aims to reconstruct the doctrinal evolution of the juridical thought in the transition from liberal constitutionalism - identifiable with the nineteenth-century theories of the "rule of law" - to democratic-social constitutionalism that inspires and shapes the "Welfare State". In short, democratic-social constitutionalism can be viewed as the fundamental core of the social pact through which the European and Western civilisation manages to provide a democratic alternative to the disintegration of the liberal states. The main features of the new constitutionalism will be analyzed by focusing on what, in our opinion, can be considered its main “pillars”.

:CIENCIAS JURÍDICAS [UNESCO]PhilosophyMortatiMass democracySubstantial equalityWelfare StateUNESCO::CIENCIAS JURÍDICASK201-487Jurisprudence. Philosophy and theory of lawGénéralitésLawConstitutionalism
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Patients' and physicians' preferences for type 2 diabetes mellitus treatments in Spain and Portugal: a discrete choice experiment.

2015

Objective: To assess Spanish and Portuguese patients' and physicians' preferences regarding type 2 diabetes mellitus (T2DM) treatments and the monthly willingness to pay (WTP) to gain benefits or avoid side effects. Methods: An observational, multicenter, exploratory study focused on routine clinical practice in Spain and Portugal. Physicians were recruited from multiple hospitals and outpatient clinics, while patients were recruited from eleven centers operating in the public health care system in different autonomous communities in Spain and Portugal. Preferences were measured via a discrete choice experiment by rating multiple T2DM medication attributes. Data were analyzed using the cond…

:Geographicals::Geographic Locations::Europe::Portugal [Medical Subject Headings]cardiovascular riskHbA1cendocrine system diseases:Analytical Diagnostic and Therapeutic Techniques and Equipment::Diagnosis::Diagnostic Techniques and Procedures::Physical Examination::Body Constitution::Body Weights and Measures::Body Mass Index [Medical Subject Headings]:Diseases::Nutritional and Metabolic Diseases::Metabolic Diseases::Glucose Metabolism Disorders::Hypoglycemia [Medical Subject Headings]:Disciplines and Occupations::Health Occupations::Medicine::Public Health [Medical Subject Headings]:Analytical Diagnostic and Therapeutic Techniques and Equipment::Investigative Techniques::Epidemiologic Methods::Statistics as Topic::Probability::Risk::Risk Factors [Medical Subject Headings]:Organisms::Eukaryota::Animals::Chordata::Vertebrates::Mammals::Primates::Haplorhini::Catarrhini::Hominidae::Humans [Medical Subject Headings]:Named Groups::Persons::Occupational Groups::Health Personnel::Physicians [Medical Subject Headings]HbA(1c)HbA:Diseases::Pathological Conditions Signs and Symptoms::Signs and Symptoms::Body Weight::Body Weight Changes::Weight Loss [Medical Subject Headings]:Diseases::Cardiovascular Diseases [Medical Subject Headings]preferences:Geographicals::Geographic Locations::Europe::Spain [Medical Subject Headings]diabetesnutritional and metabolic diseasesPeso corporalweightPérdida de peso:Health Care::Health Care Facilities Manpower and Services::Health Facilities::Ambulatory Care Facilities [Medical Subject Headings]Diabetes mellitus tipo 2:Diseases::Pathological Conditions Signs and Symptoms::Signs and Symptoms::Signs and Symptoms Digestive::Nausea [Medical Subject Headings]hypoglycemia:Analytical Diagnostic and Therapeutic Techniques and Equipment::Investigative Techniques::Epidemiologic Methods::Statistics as Topic::Models Statistical::Logistic Models [Medical Subject Headings]:Diseases::Pathological Conditions Signs and Symptoms::Signs and Symptoms::Body Weight [Medical Subject Headings]:Diseases::Nutritional and Metabolic Diseases::Metabolic Diseases::Glucose Metabolism Disorders::Diabetes Mellitus::Diabetes Mellitus Type 2 [Medical Subject Headings]:Chemicals and Drugs::Chemical Actions and Uses::Pharmacologic Actions::Physiological Effects of Drugs::Hypoglycemic Agents [Medical Subject Headings]Enfermedades cardiovascularesHipoglucemiawillingness to pay:Check Tags [Medical Subject Headings]discrete choice model
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Religious-Philosophical Articles, XXXIII

2022

Žurnāla “Reliģiski-filozofiski raksti” XXXIII laidiens veltīts Latvijas sabiedrības vērtību analīzei salīdzinošā perspektīvā. Ņemot vērā vērtību jēdziena daudzdimensionālo raksturu, vērtību apraksts, analīze un klasifikācija visos laikos ir izraisījusi diskusijas, strīdus un pat konfliktus. Ideja veidot speciālu žurnāla numuru nolūkā veicināt teorētisko un empīrisko zināšanu attīstību par vērtībām Latvijā, aicinot sociālo un humanitāro zinātņu pētniekus dalīties ar jaunākajiem pētījumiem un atziņām šajā jomā, dzima projekta “Vērtību maiņa nestabilos apstākļos: sabiedrības saliedētība un neoliberālais ētoss” īstenošanas laikā. Pētnieciskā projekta tiešais mērķis bija sniegt jaunu salīdzinošu…

:HUMANITIES and RELIGION::Other humanities and religion [Research Subject Categories]kultūras vērtības:SOCIAL SCIENCES::Social sciences::Sociology [Research Subject Categories]eitanāzijapašnāvībaetnolingvistiskā kopienajaunatnevērtības:SOCIAL SCIENCES::Other social sciences::Mass communication [Research Subject Categories]:SOCIAL SCIENCES::Social sciences::Social anthropology/ethnography::Social anthropology [Research Subject Categories]starppaaudžu vērtības:SOCIAL SCIENCES::Other social sciences [Research Subject Categories]lokālā identitātenevienlīdzībaabortsnacionālā identitāteLatvijas iedzīvotāju vērtībasnāvessods
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