Search results for "COMPOSITION"

showing 10 items of 2675 documents

The chemical composition of the aerial parts essential oil of Lonas annua (L.) Vines & Druce (Asteraceae)

2022

Lonas annua (L.) Vines & Druce (Asteraceae), commonly known as African Daisy or Yellow Ageratum is a rare therophyte native to northwestern Africa (Algeria, Morocco, and Tunisia) and Italy (Sicily and Sardinia). In the present study, the chemical composition of the essential oil from aerial parts of Lonas annua was analyzed by GC-MS. No one report has been previously published on the essential oil of this species. The results showed the presence of large quantity of two unusual metabolites 2,3-dihydrofarnesol (41.64%), and acenaphthene (36.18%). Chemotaxonomic considerations were carried out in order to confirm the phylogenetic reconstructions of Anthemideae.

3-dihydrofarnesolchemotaxonomyAfrican Daisycompositaevolatile compositionOrganic Chemistry2Plant ScienceBiochemistrysicilian floraacenaphtheneAnalytical ChemistryNatural Product Research
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Body Composition in Late Midlife as a Predictor of Accelerated Age-associated Deficit-accumulation From Late Midlife into Old Age: A Longitudinal Bir…

2022

Abstract Background Body mass index (BMI) may not be an optimal predictor of frailty as its constituents, lean and fat mass, may have opposite associations with frailty. Methods A linear mixed model analysis was performed in the Helsinki Birth Cohort Study (n = 2 000) spanning from 57 to 84 years. A 39-item frailty index (FI) was calculated on three occasions over 17 years. Body composition in late midlife included BMI, percent body fat (%BF), waist-to-hip ratio (WHR), lean mass index (LMI), and fat mass index (FMI). Results Mean FI levels increased by 0.28%/year among men and by 0.34%/year among women. Among women, per each kg/m2 higher BMI and each unit higher %BF the increases in FI leve…

3141 Health care sciencebody compositiongerasteniaAgingrisk factorlife-courseruumisfrailtyriskitekijätGeriatrics and GerontologyelämänkaarikehonkoostumusThe Journals of Gerontology: Series A
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Family background and problems at school and in society: The role of family composition, emotional atmosphere and parental education

1997

Three studies were carried out to examine the extent to which family composition, size and atmosphere, parental control, and the level of parental education and socioeconomic status, are associated with young people’s problems at school, and later on in society. In study 1, twenty-four 13- to 14-year-old underachievers, and 24 of their matched-pair controls, and 24 overachievers and 24 of their matchedpair controls, were compared according to their family background. In study 2, sixteen low achieving pupils, 20 vocational school pupils and 21 senior high school pupils, aged between 14 and 19, were examined. In study 3, twenty unemployed young adults, 14 students with health problems, and 23…

4. Educationeducation05 social sciences050301 educationEducational psychologyAcademic achievementAtmosphere (architecture and spatial design)EducationDevelopmental psychologyParental educationDevelopmental and Educational Psychology0501 psychology and cognitive sciencesYoung adultPsychology0503 educationSocioeconomic statusComposition (language)050104 developmental & child psychologySocial influenceEuropean Journal of Psychology of Education
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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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Soil fungi invest into asexual sporulation under resource scarcity, but trait spaces of individual isolates are unique

2022

During the last few decades, a plethora of sequencing studies provided insight into fungal community composition under various environmental conditions. Still, the mechanisms of species assembly and fungal spread in soil remain largely unknown. While mycelial growth patterns are studied extensively, the abundant formation of asexual spores is often overlooked, though representing a substantial part of the fungal life cycle relevant for survival and dispersal. Here, we explore asexual sporulation (spore abundance, size and shape) in 32 co-occurring soil fungal isolates under varying resource conditions, to answer the question whether resource limitation triggers or inhibits fungal investment…

570ympäristötekijätReproductionFungi500 Naturwissenschaften und Mathematik::570 Biowissenschaften; Biologie::570 Biowissenschaften; BiologiemaaperäeliöstöSpores FungallisääntyminenMicrobiologySoilfungal spreadPhenotypefungal community compositionReproduction Asexualsoil fungisuvuton lisääntyminensienetEcology Evolution Behavior and SystematicsitiötEnvironmental Microbiology
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From Feynman–Kac formulae to numerical stochastic homogenization in electrical impedance tomography

2016

In this paper, we use the theory of symmetric Dirichlet forms to derive Feynman–Kac formulae for the forward problem of electrical impedance tomography with possibly anisotropic, merely measurable conductivities corresponding to different electrode models on bounded Lipschitz domains. Subsequently, we employ these Feynman–Kac formulae to rigorously justify stochastic homogenization in the case of a stochastic boundary value problem arising from an inverse anomaly detection problem. Motivated by this theoretical result, we prove an estimate for the speed of convergence of the projected mean-square displacement of the underlying process which may serve as the theoretical foundation for the de…

65C05Statistics and Probability65N21stochastic homogenizationquantitative convergence result01 natural sciencesHomogenization (chemistry)78M40general reflecting diffusion process010104 statistics & probabilitysymbols.namesakeFeynman–Kac formula60J4535Q60Applied mathematicsFeynman diagramBoundary value problemSkorohod decomposition0101 mathematicsElectrical impedance tomographyBrownian motionMathematicsrandom conductivity field65N75010102 general mathematicsFeynman–Kac formulaLipschitz continuityBounded functionstochastic forward problemsymbols60J55Statistics Probability and Uncertainty60H30electrical impedance tomographyThe Annals of Applied Probability
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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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La escritura en la diócesis de Segorbe : una aproximación al estudio del alfabetismo y la cultura escrita en el Alto Palancia : 1383-1458

1984

:GEOGRAFÍA [UNESCO]Language Rhetoric and CompositionRegional StudiesReligion GeneralUNESCO::GEOGRAFÍA
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A corpus linguistics and critical discourse analysis of violence in the Brothers Grimm's fairy tales collection

2011

:LINGÜÍSTICA [UNESCO]Language Rhetoric and CompositionLiterature GermanicUNESCO::LINGÜÍSTICA
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Chemical Composition and antimicrobial activity of the essential oils from two species of Thimus growing wild in southern Italy

2009

The volatile constituents of the aerial parts of two samples of Thymus longicaulis C. Presl, collected in Campania and in Sicily, and two samples of Thymus pulegioides L. from the same regions, were extracted by hydrodistillation and analyzed. Considering the four oils together, seventy-eight different compounds were identified: 57 for Thymus longicaulis from Sicily (91.1% of the total oil), 40 for Thymus longicaulis from Campania (91.5% of the oil), 39 for Thymus pulegioides from Sicily (92.5% of the oil) and 29 for Thymus pulegioides from Campania (90.1% of the oil). The composition of the oils is different, although the most abundant components are identical in T. pulegioides. The essent…

<em>Thymus longicaulis</em> C. Presl; <em>Thymus pulegioides </em>L.; essential oil composition; thymol; geraniol; antibacterial activityThymus pulegioidesPharmaceutical ScienceMicrobial Sensitivity TestsArticleAnalytical Chemistrylcsh:QD241-441Thymus Plantchemistry.chemical_compoundlcsh:Organic chemistryantibacterial activitythymolDrug DiscoveryBotanyOils VolatilePlant OilsThymus PlantSettore BIO/15 - Biologia FarmaceuticaPhysical and Theoretical ChemistrygeraniolThymolChemical compositionessential oil compositionThymus longicaulisbiologyBacteriaThymus pulegioides L.Organic ChemistrySettore CHIM/06 - Chimica Organicabiology.organism_classificationAntimicrobialAnti-Bacterial AgentschemistryItalyantimicrobial activity essential oils Thimus longicaulis Thimus pulegioidesChemistry (miscellaneous)Molecular MedicineComposition (visual arts)Thymus longicaulis C. PreslGeraniol
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