Search results for "TGA"

showing 10 items of 232 documents

Catecholamine release in human skin--a microdialysis study.

2003

Dermal microdialysis might be a promising tool to investigate properties of sympathetic neurons in the skin as investigation of peripheral noradrenergic neurons in humans usually relies on highly variable vasoconstrictor reflexes or on indirect measurements like skin temperature recordings. To evaluate this technique, 21 experiments were performed in 15 healthy subjects with four intracutaneous microdialysis fibers (diameter, 200 microm; cutoff, 5 kDa) at hands or feet. After 60 min, saline perfusion tyramine at concentrations of 0.195 to 200 microg/ml was applied for 15 min followed by a 15-min saline perfusion again. Catecholamine concentrations were detected through high-performance liqu…

AdultMaleMicrodialysisSympathetic nervous systemmedicine.medical_specialtyDopamineMicrodialysisPresynaptic TerminalsTyramineHuman skinSweatingNorepinephrinechemistry.chemical_compoundNorepinephrineCatecholaminesSympathetic Fibers PostganglionicDevelopmental NeuroscienceInternal medicinemedicineHumansSkinDose-Response Relationship DrugChemistrySecretory VesiclesTyramineAxonsUp-RegulationEpinephrinemedicine.anatomical_structureEndocrinologyNeurologyVasoconstrictionCatecholamineFemalePerfusionmedicine.drugExperimental neurology
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Spreading of sudomotor axon reflexes in human skin.

2005

Acetylcholine (ACh) activates both sudomotor fibers and primary afferent nociceptors. This leads to sudomotor and vasodilator axon reflexes, which can be diminished, for example, in neuropathies. In some neuropathies, however, there is increased axon reflex sweating, a response pattern that has never been observed for vasodilator flares.To compare both types of axon reflexes and to elucidate possible differences.In healthy young male subjects, sweat response and flare reaction in response to ACh were quantified. Constant-current iontophoresis (300 mC) of ACh was performed on the lateral lower legs. The sudomotor axon reflex was visualized with iodine starch staining, and the sweat response …

AdultMaleSensory Receptor CellsHuman skinSweatingEfferent PathwaysSympathetic Fibers PostganglionicReflexMedicineHumansPeripheral NervesAxonSkinAfferent PathwaysNerve Fibers Unmyelinatedintegumentary systemIontophoresisbusiness.industryNociceptorsAnatomyAcetylcholineSweat GlandsSudomotorVasodilationVasomotor Systemmedicine.anatomical_structurenervous systemReflexNociceptorBlood VesselsAxon reflexNeurology (clinical)businessAcetylcholinemedicine.drugNeurology
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Acute Physiological Responses to Four Running Sessions Performed at Different Intensity Zones

2020

AbstractThis study investigated acute responses and post 24-h recovery to four running sessions performed at different intensity zones by supine heart rate variability, countermovement jump, and a submaximal running test. A total of 24 recreationally endurance-trained male subjects performed 90 min low-intensity (LIT), 30 min moderate-intensity (MOD), 6×3 min high-intensity interval (HIIT) and 10×30 s supramaximal-intensity interval (SMIT) exercises on a treadmill. Heart rate variability decreased acutely after all sessions, and the decrease was greater after MOD compared to LIT and SMIT (p<0.001; p<0.01) and HIIT compared to LIT (p<0.01). Countermovement jump decreased only after …

AdultMaleSupine positionTime FactorskestävyysharjoitteluMovementpalautuminenPhysical ExertionPhysical Therapy Sports Therapy and RehabilitationAutonomic Nervous SystemInterval trainingRunningjuoksuRandom AllocationYoung Adultrecoveryendurance trainingEndurance trainingHeart RateHeart rate variabilityMedicineHumansOrthopedics and Sports MedicineLactic AcidTreadmillsubmaximal running testinterval trainingcountermovement jumpbusiness.industryheart rate variabilityRecovery of FunctionintervalliharjoitteluPhysiological responsesParasympathetic Fibers PostganglionicIntensity (physics)AthletesAnesthesiaCountermovement jumpExercise TestPhysical Endurancebusiness
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Zvaigžņotā Debess: 2017, Pavasaris (235)

2017

Contents: “ZVAIGŽŅOTĀ DEBESS” FORTY YEARS AGO: E.Mūkins. Clouds of Venus: Structure and Composition (abridged) ; J.Miezis. 3rd All-union Young Astronomers Gathering (abridged) ; DEVELOPMENTS in SCIENCE: K.Schwartz. New Discoveries in the Milky Way ; DISCOVERIES: I.Eglītis. Small Planets Get Latvian Names ; I.Pundure. Earth-mass World Revealed around Proxima Centauri ; SPACE RESEARCH and EXPLORATION: J.Jaunbergs. Mysteries of Saturn’s Clouds ; A.Slavinskis. Contribution of Estonian Student Satellite Programme ESTCube to Largest Challenges for Humanity ; R.Misa. Impossible Engine that Is likely Possible ; I.Pundure. ESO VLT to Search for Planets in Alpha Centauri System ; EARTH and COSMOS: J.…

Akadēmiķim Oļģertam Dumbrājam – Artura Balklava balva 2017Kosmologs un matemātiķis abats Žoržs LemetrsStarptautiskā matemātikas olimpiāde 2015 – uzdevumu atrisinājumiErnestam Ābelem – 110Pasaules laiks UTC 31.XII 2016. liekā sekunde un LU AI atompulkstenisAsteroīdi – Saule EglitisZemes masas citplanēta Proxima bDzinējs EmDriveIgaunijas Studentu satelītu programma ESTCubeZemes vulkānismsLU Astronomiskais tornis – trešā desmitgadePiena Ceļa galaktika – struktūraSeminārs “Ērglis 2016” MazsalacāESO VLT – planētas Centaura Alfas sistēmāMārīte Eglīte (1951-2016)Vidējās masas melnā cauruma kandidātsTiho Brahe Vēnas salāDebess spīdekļi – 2017.gada pavasarisAgrim J. Kalnājam – 80Nozīmīgākie sasniegumi Latvijas zinātnē 2016:NATURAL SCIENCES::Physics::Astronomy and astrophysics [Research Subject Categories]Saturns – atmosfēraĶīnas nesējraķete CZ-5Mārim Ābelem – 80Zvaigžņotais visums grafikas mākslāIzstāde LU Bibiliotēkā – ar Latviju saistīti asteroīdu nosaukumi
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Vēsture: Latvijas Universitātes Žurnāls, Nr.11/12

2021

Anatol Shmelev. In the Wake of Empire: Anti-Bolshevik Russia in International Affairs 1917–1920. Stanford California 2021. xiii + 572 p. ISBN 978-0-8179-2424-9 [Recenzija par grāmatu]Ingus Barovskis. Mythopoeia: mūsdienu mītrade. Rīga 2021. 277 lpp. ISBN 978-9934-18-678-3 [Recenzija par grāmatu]Krievijas Ziemeļrietumu armija (1919.–1920.)Ivars Ījabs. Sociāldemokrātija un valsts dibināšana: Latvija. Rīga 2018. 49 lp. ISBN 978-9934-19-670-6 [Recenzija par grāmatu]Spanish Civil War medical aidKārina Pētersone. Valstsvīrs Anatolijs Gorbunovs. Rīga 2020. 796 lpp. ISBN 978-9934-0-9244-2 [Recenzija]Emotions Florencejūrniecība latviešu trimdāUldis Bērziņš. Laikmets kad bija jāraud pat akmeņiem: dokumentu un atmiņu apkopojums. Limbaži 2021. 338 lpp. ISBN 978-9934-596-16-2 [Recenzija par grāmatu]:HUMANITIES and RELIGION::History and philosophy subjects::History subjects [Research Subject Categories]Latvijas akadēmiski izglītoto sieviešu apvienībaLatvijas Igaunijas un Lietuvas armijas virspavēlnieku un to pārstāvju apspriede Valkā 1920. gada 6. janvārīZigmārs Turčinskis. Ziemeļ latgales “Neatkarības vienība”. Pretošanās padomju okupācijai. 1946.–1954. gads. Rīga 2021. 574 lpp. ISBN 978-9934-15-909-1 [Recenzija par grāmatu]Rīgas Arodbiedrību centrālbiroja darbība [Sociālās apdrošināšana]Susan R. Grayzel Tammy M. Proctor (eds.). Gender and the Great War. New York 2017. 286 p. ISBN 978-0-1902-7108-4 [Recenzija par grāmatu]
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Separation of halloysite/kaolinite mixtures in water controlled by sucrose addition: The influence of the attractive forces on the sedimentation beha…

2022

In this work, we propose an easy strategy for the separation of halloysite/kaolinite mixtures in sucrose aqueous solution. Preliminarily, we investigated the influence of the sucrose addition on the colloidal stability of kaolinite nanoplates and halloysite nanotubes (HNTs) dispersed in water. Dynamic Light Scattering (DLS) measurements revealed that the HNTs aqueous mobility is dependent on the sucrose concentration, while the ζ-potential is negligibly affected by the addition of the carbohydrate in the aqueous solvent. On the other hand, any variations on the surface charge and dynamic behavior of kaolinite were detected in the presence of sucrose. The obtained ζ-potential and DLS results…

Aqueous colloidal stabilityTGAColloid and Surface ChemistryHalloysite nanotubesNanoclaysSeparationSettore CHIM/02 - Chimica FisicaColloids and Surfaces A: Physicochemical and Engineering Aspects
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O2 Diffusion in Amorphous SiO2 Nanoparticles Probed by Outgassing

2012

An experimental study of the O2 diffusion process in nanoparticles of amorphous SiO2 in the temperature range from 98 to 157 °C was carried out by Raman and photoluminescence techniques. We studied O2 diffusion in high purity silica nanoparticles with a mean diameter of 14, 20, and 40 nm detecting the outgassing of molecules trapped during the manufacturing. The kinetics of diffusion is well described for all the investigated nanoparticles by the Fick’s equation proving its applicability to nanoscale systems. The diffusion coefficient features an Arrhenius law temperature dependence in the explored temperature range, and the diffusion coefficient values are in good agreement with extrapolat…

Arrhenius equationMaterials scienceDiffusionSettore FIS/01 - Fisica Sperimentalenanosilica diffusion raman spectroscopyAnalytical chemistryPhysics::OpticsAtmospheric temperature rangeSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsAmorphous solidOutgassingsymbols.namesakeGeneral EnergyDiffusion processsymbolsEffective diffusion coefficientPhysical and Theoretical ChemistryRaman spectroscopyThe Journal of Physical Chemistry C
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Zvaigžņotā Debess: 2016/17, Ziema (234)

2016

Contents: “ZVAIGŽŅOTĀ DEBESS” FORTY YEARS AGO: A.Balklavs. New Possibilities in Search of Cosmic Gravitational Waves (abridged) ; E.Mūkins. «Venus-9» and «Venus-10» Scientific Accomplishment (abridged) ; DEVELOPMENTS in SCIENCE: K.Schwartz. The Unknown Solar Corona ; DISCOVERIES: I.Pundure. Gaia Has Obtained Billion-Star 3D Map ; SPACE RESEARCH and EXPLORATION: J.Jaunbergs. Tar Lakes of Titan ; R.Misa. A Step Closer to Stars ; CONFERENCES and MEETINGS: J.Balodis. Copernicus Is Becoming an Impressive Business ; K.Bērziņš. Conference of Young European Radioastronomers at the Latvian Centre in Germany ; FLASHBACK: A.Alksnis. Short Trips and Faraway Journeys (concluded) ; For SCHOOL YOUTH: D.Bo…

Astroloģija-pareģojumiESA Copernicus programmaLVU astronomijas studenti – vēstulesLatvijas 41.atklātā fizikas olimpiāde16.astronomijas amatieru salidojums Starspace observatorijā:NATURAL SCIENCES::Physics::Astronomy and astrophysics [Research Subject Categories]LU Astronomijas institūts 2015.gadāSaules aptumsumi filatēlijāMildai Zepei – 100“Zvaigžņotās Debess” autori – pasākums Latvijas Zinātņu akadēmijāMārtiņam Bucleram – 150Debess spīdekļi – 2016. gada rudensAstroloģija – astromaģijaEiropas jaunie radioastronomi latviešu centrā BonnāStarpzvaigžņu zonde StarChipZvaigžņu svītru fotogrāfijasSaules koronaGaia’s pirmais katalogs – miljardzvaigžņu 3D karteLatvijas līgums ar CERNValfrīdam Osvaldam – 100Titāns – darvas ezeriPilns Saules aptumsums Sulavesi salāSaules pulksteņi Latvijā 2011-2015Saules pulksteni Latvijas simtgadei
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Zvaigžņotā Debess: 2009/10, Ziema (206)

2009

Contents: TASS and Soviet Press materials. Flight of the Group of Three Soviet Spaceships ; Soviet and Foreign Press materials. Second Expedition on the Moon ; Č.Šklennik. Excursion to an Ancient Laboratory ; M.Gills. Opening Address ; Conference “Astronomy in Latvia” Programme ; From Presentation Abstracts ; I.Pundure. First Enterprise of this Kind ; N.Cimahoviča. Astronomical Contribution to Culture ; A.Alksnis. First Findings of Space Mission CoRoT ; I.Pundure. Ten Years of Chandra Hot Universe Exploration ; M.Gills. The Beginning of Autumn with Astronomy ; Buying Stars and Star Names (translation from IAU) ; I.Pundure. Arturs Balklavs and Astronomy of Latvia (1990-1997) ; J.Jaunbergs. A…

Astronomija kultūrāNesējraķetes Ares I izstrādeArturs Balklavs “Latvijas astronomija pēc Trešās atmodas”Krustvārdu mīklaLU fizikas docents Ludvigs JansonsCoRoT misijas pirmie rezultātiKosmiskā ēra pastmarkāsKonference “Astronomija Latvijā”Astronomiskās parādības - 2009Latvijas astronomija - vēstureLatvijas atklātā fizikas olimpiādeStarptautiskais Astronomijas gads 2009 - pasākumiTeodoram Grothusam – 225Latvijas matemātikas olimpiāde – uzdevumu atrisinājumiAstronomijas seminārs „Ērgļa tau”LZA Fizikas un tehnisko zinātņu nodaļas sēdes „Starptautiskais Astronomijas gads” lēmuma projektsRentgenstaru observatorijas Chandra desmitgadeLatvijas Pasta Eiropas sērijaMarsa meteorītiAstronomiskās parādības - 2010Zvaigžņu un to nosaukumu pirkšanaRosetta’s trešā pietuvošanās ZemeiAstronomija Zinātņu akadēmijas sēdēs 2009.gadāPilnais Saules aptumsums - novērojumi - 2009. gada 22. jūlijs Ķīna
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A muscarinic inhibition of the noradrenaline release evoked by postganglionic sympathetic nerve stimulation

1969

1. The noradrenaline output from isolated rabbit hearts perfused with Tyrode solution was estimated fluorimetrically. The postganglionic sympathetic nerves of the heart were stimulated (10 shocks/sec; 1 msec) for three 1 min periods with intervals of 10 min. 2. The noradrenaline output evoked by 3 consecutive stimulation periods decreased exponentially. 3. Acetylcholine (10−9–10−6 g/ml) administered continuously one min before to one min after the second stimulation caused a dose-dependent reduction of the noradrenaline output evoked by the second stimulation to as low as 19% of the normal value. Acetylcholine in the concentrations applied did not cause a noradrenaline output by itself. 4. …

AtropineMalemedicine.medical_specialtySympathetic Nervous SystemTyramineStimulationHexamethonium CompoundsIn Vitro TechniquesPiperazinesNorepinephrinechemistry.chemical_compoundInternal medicineMuscarinic acetylcholine receptormedicineAnimalsMethacholine CompoundsFluorometryReceptors CholinergicPharmacologyHeartAdrenergic nervous systemGeneral MedicineCoronary VesselsAcetylcholineElectric StimulationReceptors AdrenergicPerfusionQuaternary Ammonium CompoundsAtropineEndocrinologyParasympathomimeticschemistryDepression ChemicalAutonomic Fibers PostganglionicCholinergicFemaleHexamethoniumMethacholineRabbitsAcetylcholinemedicine.drugNaunyn-Schmiedebergs Archiv f�r Pharmakologie
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