Search results for "Ultra"
showing 10 items of 4451 documents
Ultrafast optics in coherently spinning molecules
2020
This thesis reports on the study of unidirectional rotation of molecules and focuses on the rotational Doppler effect occuring in the course of third-harmonic generation in coherently spinning molecules.The rotational Doppler effect appears when a circularly polarized wave interacts with an anisotropic rotating object. During the interaction, an exchange of angular momentum and energy between the field and the object occurs, leading to a frequency shift of the wave. In this work, the frequency shift of the third-harmonic generated in unidirectionaly rotating molecules has been observed. An anlytical model developped in the mansucript forsees four kinds of frequency shifts depending on the m…
Variations in the Thickness of the Plantar Fascia After Training Based in Training Race. A Pilot Study.
2020
Plantar fascia (PF) is a connective tissue made up of mostly type 1 collagen that is subjected to constant loads. This study evaluated the effect of continuous running on tissue stress in the PF by measuring changes in the thickness of the PF using ultrasound scans. It was a cross-sectional study involving 24 runners from the University of Valen- cia, recruited as volunteers between December 2018 and February 2019. A variety of data was recorded: (age, body mass index, type of footwear, number of workouts per week, KM run per week, sports injuries in the last year, pre and postrace ultrasound PF measurements). There were significant differences in the 3 postrace meas- urements of the left f…
Search for ultrahigh-energy tau neutrinos with IceCube
2012
The first dedicated search for ultrahigh-energy (UHE) tau neutrinos of astrophysical origin was performed using the IceCube detector in its 22-string configuration with an instrumented volume of roughly 0.25 km3. The search also had sensitivity to UHE electron and muon neutrinos. After application of all selection criteria to approximately 200 live-days of data, we expect a background of 0.60±0.19(stat)+0.56−0.58(syst) events and observe three events, which after inspection, emerge as being compatible with background but are kept in the final sample. Therefore, we set an upper limit on neutrinos of all flavors from UHE astrophysical sources at 90% C.L. of E2νΦ90(νx)<16.3×10−8 GeV cm−2…
No biomasas iegūta levoglikozenona un tā degradācijas produktu noteikšana ātrās pirolīzes produktos, izmantojot UHPLC-UV-QDa sistēmu
2019
Literatūras apskatā apkopota informācija par levoglikozenona potenciālajām izmantošanas iespējām, tā izdalīšanas un noteikšanas metodēm, kā arī tā stabilitāti un iespējamajiem degradācijas produktiem. Apkopota informācija par savienojumu stabilitātes noteikšanas metodiku. Izmantojot UHPLC-UV sistēmu, izstrādāta metode levoglikozenona un tā degradācijas produktu identifikācijai, kā arī veikta metodes analītisko parametru noteikšana. Pēc izstrādātās UHPLC-UV metodes veikti levoglikozenona standartvielas un ātrās pirolīzes produktu – kondensātu un to ekstrakcijas frakciju – stabilitātes pētījumi dažādās šķīdinātāju sistēmās, divās temperatūrās un mainot šķīduma vides pH. Izmantojot UHPLC-MS si…
ST elevāciju miokarda infarkta noteicošās artērijas intravaskulārās ultraskaņas audu raksturojuma saistība ar aterosklerozes asins biomarķieriem un s…
2013
Anotācija ST elevāciju miokarda infarkta gadījumā (STEMI) patofizioloģiskais substrāts ir rupturējusi vai erodējusi panga un tromboze. Šajā darbā veicām iMap IVUS audu analīzi STEMI mērķa bojājumiem 75 pacientiem, noteicām asinīs aterosklerozes biomarķierus un veicām 10 mēnešu apsekojumu. Mūsu rezultāti parādīja augstu nekrotisko audu daudzumu mērķa bojājumā un augstu, bet salīdzinoši zemāku, proksimālajā segmentā. Proksimālajā segmentā 10 mēnešu laikā samazinājās lipīdu audu daudzums par 10,2%. Neointimai 10 mēnešus pēc stenta implantācijas bija raksturīgs stabilāks audu sastāvs pēc iMap IVUS nekā natīvai aterosklerotiskai pangai šajā artērijā. Asins aterosklerozes biomarķieru saistību ar …
WAM tomography in the southern Tyrrhenian region : petrological inferences and hypothesis on the fluid circulation in the subducting Ionian slab and …
2008
SURVEILLANCE PROGRAM FOR DIAGNOSIS OF HCC IN LIVER CIRRHOSIS: ROLE OF ULTRASOUND ECHOPATTERNS
2013
Sequential window acquisition of all theoretical fragments versus information dependent acquisition for suspected-screening of pharmaceuticals in sed…
2019
The aquatic ecosystems are dynamic environments often affected directly or indirectly by a myriad of anthropogenic contaminants that need to be properly identified. In this study, liquid chromatography-quadrupole time-of-flight mass spectrometry (LC-QqTOF-MS) suspected-screening was applied to mussels and riverine sediment both, non-spiked and spiked with a mixture of 32 pharmaceuticals. Three data acquisition methods –sequential window acquisition of all theoretical fragment-ion spectra (SWATH), in fix (FSWATH) and variable (VSWATH) window modes and Information Dependent Acquisition (IDA)– were compared to determine the most suitable acquisition technique. The results obtained in the spike…
Lateral reorganization of plasma membrane is involved in the yeast resistance to severe dehydration
2010
International audience; In this study, we investigated the kinetic and the magnitude of dehydrations on yeast plasma membrane (PM) modifications because this parameter is crucial to cell survival. Functional (permeability) and structural (morphology, ultrastructure, and distribution of the protein Sur7-GFP contained in sterol-rich membrane microdomains) PM modifications were investigated by confocal and electron microscopy after progressive (non-lethal) and rapid (lethal) hyperosmotic perturbations. Rapid cell dehydration induced the formation of many PM invaginations followed by membrane internalization of low sterol content PM regions with time. Permeabilization of the plasma membrane occ…
Clonal differences in growth and phenolics of willows exposed to elevated ultraviolet-B radiation
2003
Abstract In this study, the effects of elevated ultraviolet-B (UV-B, 280–320 nm) radiation on growth and leaf phenolics were evaluated in clones of dark-leaved willow ( Salix myrsinifolia Salisb.) and tea-leaved willow ( Salix phylicifolia L.). Willows were raised for one growing season in an irradiation field, where they were exposed either to a constant 50% increase in UV-B CIE radiation simulating 20–25% ozone depletion or to a small increase in UV-A radiation (320–400 nm). Control willows were grown in the irradiation field under solar radiation (ambient control). Despite the high constitutive concentrations of a UV-absorbing leaf flavonoid, dihydromyricetin, UV-treatments clearly reduc…