Search results for "Sst"
showing 10 items of 538 documents
Soft-dielectron excess in proton-proton collisions at $\sqrt{s}$ = 13 TeV
2021
Physical review letters 127(4), 042302 (2021). doi:10.1103/PhysRevLett.127.042302
Mitochondrial redox signaling: Interaction of mitochondrial reactive oxygen species with other sources of oxidative stress.
2014
Significance: Oxidative stress is a well established hallmark of cardiovascular disease and there is strong evidence for a causal role of reactive oxygen and nitrogen species (RONS) therein. Recent Advances: Improvement of cardiovascular complications by genetic deletion of RONS producing enzymes and overexpression of RONS degrading enzymes proved the involvement of these species in cardiovascular disease at a molecular level. Vice versa, overexpression of RONS producing enzymes as well as deletion of antioxidant enzymes was demonstrated to aggravate cardiovascular complications. Critical Issues: With the present overview we present and discuss different pathways how mitochondrial RONS inte…
Unveiling pure-metal ejecta X-ray emission in supernova remnants through their radiative recombination continuum
2020
Spectral analysis of X-ray emission from ejecta in supernova remnants (SNRs) is hampered by the low spectral resolution of CCD cameras, which creates a degeneracy between the best-fit values of abundances and emission measure. The combined contribution of shocked ambient medium and ejecta to the X-ray emission complicates the determination of the ejecta mass and chemical composition, leading to big uncertainties in mass estimates and it can introduce a bias in the comparison between the observed ejecta composition and the yields predicted by explosive nucleosynthesis. We explore the capabilities of present and future spectral instruments with the aim of identifying a spectral feature which …
Iemesli vegānisma kā dzīvesstila izvēlei: Rīgas piemērs
2018
Bakalaura darbā „Iemesli vegānisma kā dzīvesstila izvēlei: Rīgas piemērs” pētīts tas, kā vegānisms integrējas Rīgā dzīvojoša vegāna dzīvē, kā arī galvenie iemesli kļūšanai par vegānu. Pētījuma mērķis ir noskaidrot Rīgā dzīvojošo vegānu iemeslus izvēlēties vegānismu kā dzīvesstilu. Darba apakšmērķis ir noskaidrot mediju konstruēto attieksmi pret vegānismu. Kā pētījuma teorētisko ietvaru autore izmantoja racionālās izvēles teoriju, kā arī rakstus un veiktos pētījumus par vegānismu. Lai sasniegtu pētījuma mērķi, autore izmantoja kvalitatīvo pētījuma metodi - veica 15 daļēji strukturētās intervijas ar Rīgā dzīvojošajiem vegāniem. Papildus tam autore vēlējās noskaidrot ziņu mediju konstruēto att…
Multiplexing of encrypted data using fractal masks
2012
In this Letter, we present to the best of our knowledge a new all-optical technique for multiple-image encryption and multiplexing, based on fractal encrypting masks. The optical architecture is a joint transform correlator. The multiplexed encrypted data are stored in a photorefractive crystal. The fractal parameters of the key can be easily tuned to lead to a multiplexing operation without cross talk effects. Experimental results that support the potential of the method are presented.
Renē Žirārs un Imants Ziedonis: trīsstūra mehānisms
2016
Bakalaura darbā “Renē Žirārs un Imants Ziedonis: trīsstūra mehānisms”, tiek apskatīta 20.gs. izcilā franču domātāja R.Žirāra izstrādātā teorija par trīsstūra mehānismu, kas pastāv cilvēku attiecībās. Šo trīsstūri virza iekāre, jo saskaņā ar Žirāru, tas ir cilvēku dabīgais stāvoklis, iekārot to, kas citiem. Paralēli tam, pētījuma ietvaros autore mēģina saskatīt paralēles R.Žirāra teorijai Imanta Ziedoņa daiļradē. Autore izvirza un pētījuma gaitā apstiprina tēzi, ka I. Ziedoņa epifānija „Es varu dzīvot tikai trīsstūrī ” ir idejiski vienots un ilustratīvs materiāls R. Žirāra mimesis teorijai, norādot, ka indivīds nedzīvo ārpus trīsstūra attiecību modeļa. Bet, lai gan ideja par trīsstūra mehāni…
Measuring universal health coverage based on an index of effective coverage of health services in 204 countries and territories, 1990-2019: a systema…
2020
Publisher's version (útgefin grein)
Exploring a regulatory role for mast cells: 'MCregs'?
2010
Regulatory cells can mould the fate of the immune response by direct suppression of specific subsets of effector cells, or by redirecting effectors against invading pathogens and infected or neoplastic cells. These functions have been classically, although not exclusively, ascribed to different subsets of T cells. Recently, mast cells have been shown to regulate physiological and pathological immune responses, and thus to act at the interface between innate and adaptive immunity assuming different functions and behaviors at discrete stages of the immune response. Here, we focus on these poorly defined, and sometimes apparently conflicting, functions of mast cells.
Spin crossover and photomagnetism in dinuclear iron(II) compounds
2007
Abstract In this paper, we review recent work reported in the field of molecular spin crossover phenomena in dinuclear compounds. Following a comprehensive overview on the synthesis and properties of new iron(II) dinuclear compounds presenting the spin crossover phenomenon, we focus this review on recent efforts made in studying and understanding the photo-physical properties of the {[Fe(L)(NCX)2]2bpym} (L = bt or bpym, X = S or Se) family of compounds. Finally, literature on the different theoretical approaches treating the static and dynamic properties of dinuclear complexes presenting two-step thermal spin transition is briefly summarized.
Thermal and Light-Induced Spin Transition in the High- and Low-Temperature Structure of [Fe0.35Ni0.65(mtz)6](ClO4)2
1996
The thermal and light induced spin transition in [Fe(0.35)Ni(0.65)(mtz)(6)](ClO(4))(2) (mtz = 1-methyl-1H-tetrazole) was studied by (57)Fe Mössbauer spectroscopy and magnetic susceptibility measurements. In addition to the spin transition of the iron(II) complexes the compound undergoes a structural phase transition. The high-temperature structure could be determined by X-ray crystallography of the isomorphous [Fe(0.25)Ni(0.75)(mtz)(6)](ClO(4))(2) complex at room temperature. The X-ray structural analysis shows this complex to be rhombohedric, space group Rthremacr;, with a = 10.865(2) Å and c = 23.65(1) Å with three molecules in the unit cell. The transition to the low-temperature structur…