Search results for "Concentration."

showing 10 items of 1849 documents

Parvovirus capsid disorders cholesterol-rich membranes.

2008

In this study canine parvovirus, CPV, was found to induce disorder in DPPC:cholesterol membranes in acidic conditions. This acidicity-induced fluidizing effect is suggested to originate from the N-terminus of the viral capsid protein VP1. In accordance with the model membrane studies, a fluidizing effect was seen also in the endosomal membranes during CPV infection implying an important functional role of the fluidization in the endocytic entry of the virus.

12-DipalmitoylphosphatidylcholineParvovirus CanineEndosomeMembrane Fluidityanimal diseasesvirusesEndocytic cycleBiophysicsBiochemistryViruschemistry.chemical_compoundCapsidMolecular BiologybiologyCholesterolParvovirusCanine parvovirusMembranes ArtificialCell BiologyHydrogen-Ion Concentrationbiology.organism_classificationVirologyCell biologyMembraneCholesterolCapsidchemistryCapsid ProteinsBiochemical and biophysical research communications
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Snowpack concentrations and estimated fluxes of volatile organic compounds in a boreal forest

2012

Abstract. Soil provides an important source of volatile organic compounds (VOCs) to atmosphere, but in boreal forests these fluxes and their seasonal variations have not been characterized in detail. Especially wintertime fluxes are almost completely unstudied. In this study, we measured the VOC concentrations inside the snowpack in a boreal Scots pine (Pinus sylvestris L.) forest in southern Finland, using adsorbent tubes and air samplers installed permanently in the snow profile. Based on the VOC concentrations at three heights inside the snowpack, we estimated the fluxes of these gases. We measured 20 VOCs from the snowpack, monoterpenes being the most abundant group with concentrations …

1171 Geosciences010504 meteorology & atmospheric sciencesSEASONAL-VARIATIONeducationCLIMATE CHANGElcsh:LifeVOC CONCENTRATIONS010501 environmental sciences01 natural sciencesAtmosphereSMEAR-IISNOW COVERMONOTERPENE EMISSIONSlcsh:QH540-549.5medicineSCOTS PINETEMPERATUREEcology Evolution Behavior and Systematics1172 Environmental sciencesEarth-Surface Processes0105 earth and related environmental sciencesHydrologyForest floor4112 ForestrybiologyTaigalcsh:QE1-996.5Scots pine04 agricultural and veterinary sciencesSeasonalitySnowpack15. Life on landSnowmedicine.diseasebiology.organism_classificationlcsh:GeologySOILlcsh:QH501-531Boreal13. Climate actionEnvironmental chemistry040103 agronomy & agriculture0401 agriculture forestry and fisheriesEnvironmental sciencelcsh:Ecology
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Synthesis and anti-HIV activity of 2,3-diaryl-1,3-thiazolidin-4-(thi)one derivatives.

2002

Several 2,3-diaryl-1,3-thiazolidine-4-thione derivatives and 2,3-diaryl-1,3-thiazolidin-4-ones bearing a methyl group at C-5 position have been synthesized and tested as anti-HIV agents. The results of the in vitro tests showed that some of them proved to be effective inhibitors of HIV-1 replication.

23-Diaryl-13-thiazolidine-4-thioneAnti-HIV activity23-Diaryl-13-thiazolidin-4-oneStereochemistryAnti-HIV AgentsCell SurvivalPharmaceutical ScienceVirus ReplicationChemical synthesischemistry.chemical_compoundInhibitory Concentration 50Structure-Activity RelationshipThiadiazolesDrug DiscoveryThiadiazolesmedicineTumor Cells CulturedStructure–activity relationshipHumansAnti hiv activityReverse-transcriptase inhibitorGeneral MedicineSettore CHIM/08 - Chimica FarmaceuticaIn vitrochemistryNNRTIsLactamHIV-1EpimerMethyl groupmedicine.drugFarmaco (Societa chimica italiana : 1989)
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Analytical solution of kinematic wave time of concentration for overland flow under green-ampt infiltration

2015

In this paper the well-known kinematic wave equation for computing the time of concentration for impervious surfaces has been extended to the case of pervious hillslopes, accounting for infiltration. An analytical solution for the time of concentration for overland flow on a rectangular plane surface is derived using the kinematic wave equation under the Green-Ampt infiltration. The relative time of concentration is defined as the ratio between the time of concentration of an infiltrating plane and the soil sorptivity time scale, depending on the normalized rainfall intensity and a parameter synthesizing the soil and hillslope characteristics. It is shown that for a more complex case (corre…

2300Sorptivity0208 environmental biotechnologyGreen-Ampt infiltration model; Hillslope hydrology; Kinematic wave equations; 2300; Environmental Chemistry; Water Science and Technology; Civil and Structural Engineering02 engineering and technologyMechanicsGreen-Ampt infiltration modelHillslope hydrologyPhysics::Geophysics020801 environmental engineeringKinematic wave equationKinematic waveInfiltration (hydrology)Error analysisImpervious surfaceEnvironmental ChemistrySettore AGR/08 - Idraulica Agraria E Sistemazioni Idraulico-ForestaliGeotechnical engineeringSurface runoffTime of concentrationGeologyGeneral Environmental ScienceWater Science and TechnologyCivil and Structural Engineering
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Partial purification and characterization of an NAD-dependent 3 beta-hydroxysteroid dehydrogenase from Clostridium innocuum

1989

In nine strains of Clostridium innocuum, 3 beta-hydroxysteroid-dehydrogenating activities were detected. 3 beta, 7 alpha, 12 alpha-Trihydroxy- and 3 beta-hydroxy-12-keto-5 beta-cholanoic acids were identified as reduction products of the respective 3-keto bile acids by gas-liquid chromatography and gas-liquid chromatography-mass spectrometry. One strain was shown to contain a NAD-dependent 3 beta-hydroxysteroid dehydrogenase. Enzyme production was constitutive in the absence of added bile acids. The specific enzyme activity was significantly reduced by growth medium supplementation with 3-keto bile acids, with trisubstituted acids being more effective than disubstituted ones. A pH optimum o…

3-Hydroxysteroid DehydrogenasesIon chromatographyDehydrogenaseApplied Microbiology and BiotechnologySubstrate SpecificityBile Acids and SaltsFeceschemistry.chemical_compoundHumansNucleotideClostridiumchemistry.chemical_classificationGrowth mediumChromatographyClostridium innocuumEcologybiologyHydrogen-Ion Concentrationbiology.organism_classificationMolecular WeightKineticsEnzymechemistryBiochemistryNAD+ kinaseBacteriaResearch ArticleFood ScienceBiotechnologyApplied and Environmental Microbiology
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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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Acid‐Cleavable Poly(ethylene glycol) Hydrogels Displaying Protein Release at pH 5

2020

Abstract PEG is the gold standard polymer for pharmaceutical applications, however it lacks degradability. Degradation under physiologically relevant pH as present in endolysosomes, cancerous and inflammatory tissues is crucial for many areas. The authors present anionic ring‐opening copolymerization of ethylene oxide with 3,4‐epoxy‐1‐butene (EPB) and subsequent modification to introduce acid‐degradable vinyl ether groups as well as methacrylate (MA) units, enabling radical cross‐linking. Copolymers with different molar ratios of EPB, molecular weights (M n) up to 10 000 g mol−1 and narrow dispersities (Đ<1.05) were prepared. Both the P(EG‐co‐isoEPB)MA copolymer and the hydrogels showed pH‐…

540 Chemistry and allied sciencesVinyl CompoundsBiocompatible MaterialsDegree of polymerization010402 general chemistry01 natural sciencesCatalysisPolyethylene GlycolsPolymerizationchemistry.chemical_compoundHydrolysisPolymer chemistryPEG ratioCopolymermedicinehydrogelsPolymer Technologieschemistry.chemical_classificationFull PaperEthylene oxide010405 organic chemistryHydrolysisOrganic ChemistryBiochemistry and Molecular BiologyProteinsprotein releaseHydrogelsGeneral ChemistryPolymerFull PapersHydrogen-Ion ConcentrationVinyl etherPolymerteknologiPEG0104 chemical sciencescopolymerizationchemistry540 Chemiedrug deliverySelf-healing hydrogelsMethacrylatesBiokemi och molekylärbiologimedicine.drugChemistry – A European Journal
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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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Jurisdiction by connection and proper administration of justice under eu regulations 1103/2016 and 1104/2016

2021

The author analyses the rules of jurisdiction by connection set by Articles 4 and 5 of Regulations No. 1103 and 1104 of 2016 in matters of property regimes of transnational couples, taking into account the objective of proper administration of justice pursued within EU Civil judicial cooperation. The Twin Regulations provide for appropriate procedural tools to facilitate concentration of jurisdiction before the courts of the same Member State, establishing an important role for the choice-of-court agreement, especially where property regime issues arise in connection with a matrimonial case or a partnership dissolution case. As we wait for the implementation of these rules by national and E…

:CIENCIAS JURÍDICAS [UNESCO]related actions 148 163establishing an important role for the choice-of-court agreementley de sucesiones2386-4567 22661 Actualidad jurídica iberoamericana 587897 2021 15 8113554 Jurisdiction by connection and proper administration of justice under eu regulations 1103/2016 and 1104/2016 Pía Gasperiniproperty regimesJurisdictionfamily lawtaking into account the objective of proper administration of justice pursued within EU Civil judicial cooperation. The Twin Regulations provide for appropriate procedural tools to facilitate concentration of jurisdiction before the courts of the same Member StateUNESCO::CIENCIAS JURÍDICASMaría The author analyses the rules of jurisdiction by connection set by Articles 4 and 5 of Regulations No. 1103 and 1104 of 2016 in matters of property regimes of transnational couplesregímenes económicosthe author also explores some possible drawbacks they may present. Competencialey de familiaespecially where property regime issues arise in connection with a matrimonial case or a partnership dissolution case. As we wait for the implementation of these rules by national and European courtsacciones relacionadas.succession law
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La nueva oportunidad de la hipoteca inversa

2021

The reverse mortgage is a credit or loan guaranteed by a mortgage that falls on the applicant?s habitual residence, granted at once, or through periodic benefits, to a person who must be over a certain age or prove a degree of disability or dependency, and is not due until the time of death. In view of the doubts that the future of the public pension is raising and the concentration of savings in Spanish property, the reverse mortgage is once again being put on the table as a viable alternative to complement a public pension with little revaluation, in view of the increase in life expectancy and expenses after retirement.

:CIENCIAS JURÍDICAS [UNESCO]retirement 160 207viviendaAna Suyapa The reverse mortgage is a credit or loan guaranteed by a mortgage that falls on the applicant?s habitual residenceguaranteejubilaciónto a person who must be over a certain age or prove a degree of disability or dependencyhipoteca inversaor through periodic benefitsthe reverse mortgage is once again being put on the table as a viable alternative to complement a public pension with little revaluationUNESCO::CIENCIAS JURÍDICASreverse mortgagegarantíagranted at onceand is not due until the time of death. In view of the doubts that the future of the public pension is raising and the concentration of savings in Spanish propertyin view of the increase in life expectancy and expenses after retirement. Hipoteca2070-8157 22082 Revista Boliviana de Derecho 565487 2021 31 7730056 La nueva oportunidad de la hipoteca inversa Fernández-Sancho TahocespréstamoloanhousingMortgage
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