Search results for "otos"
showing 10 items of 857 documents
The Photocatalytic Activity of Novel, Substituted Porphyrin/TiO2-Based Composites
2010
Four novel porphyrins, 5-[3-(3-phenoxy)-propoxy]phenyl porphyrin, 5,15-di-[3-(3-phenoxy)-propoxy] phenyl porphyrin, 5,10,15-tri-[3-(3-phenoxy)-propoxy]phenyl porphyrin, 5,10,15,20-tetra-[3-(3-phenoxy)- propoxy]phenyl porphyrin, and their corresponding Cu(II) porphyrins, were synthesized and characterized spectroscopically. The photodegradation of 4-nitrophenol in aq. suspension was used to determine the photocatalytic activity of polycrystalline TiO2 samples which had been impregnated with the Cu(II) porphyrins, as sensitizers. The photocatalytic activity of the composite depends mainly on the amount of sensitizer on the TiO2 surface rather than the nature of the substituted porphyrins.
Effect of nanoaquacitrates on physiological parameters of Fodder Galega infected with phytoplasma
2018
The laboratory experiments have been found that so aking seeds Galega orientalis L. (Fodder galega) in nanoaquacitrates solutions of Mn (10 and 20 mg/dm 3), Mo (4 mg/dm3) and Mg (2 and 4 mg/dm3), has been lead to germination energy rise, while Mn( 10 and 20 mg/dm3) and Mo (4 mg/dm3) concentrations has been influenced germinating ability. At the same time, the soaking seeds in solution of nanoaquacitrates Mn (20 mg/dm3) had the biggest stimulatory effect on the accumulation 7 daily sprouts mass (on 18%). It has been shown that s oaking seeds in nanoparticles Mn and Mo solutions leads to the increase of catalase activities (especially under the influence of manganese) and peroxidase activitie…
Analisi sperimentale comparativa in vitro della citotossicità di quattro tipi di resine per basi proteiche per protesi mobile.
2007
Metal Dependence on the Bidirectionality and Reversibility of the Singlet Energy Transfer in Artificial Special Pair-Containing Dyads
2017
International audience; The demetalation of a precursor dyad, 3, built upon a zinc(II)-containing artificial special pair and free-base antenna, leads to a new dyad, 4, for singlet energy transfer composed of cofacial free-base porphyrins (acceptor), [Fb](2) bridged by a 1,4-C6H4 group to a free-base antenna (donor), [Fb]. This dyad exhibits the general structure [M](2)-C6H4-[Fb], where [M](2) = [Fh](2), and completes a series reported earlier, where [M](2) = [Mg](2) (2) and [Zn](2) (3). The latter dyads exhibit a bidirectional energy-transfer process at 298 K for 2 and at 77 K for 3. Interestingly, a very scarce case of cycling process is observed for the zinc-containing dyad at 298 K. The…
La distribuzione dei redditi nelle economie protosocialiste
1987
the Yalta agreements of 1945 and the institutional models that have established themselves have generated a socio-economic system that has imposed itself through revolutionary and widespread social resignation, as opposed to the western system. The use of the administrative function, the partial application of the principle of equality, the abolition of private property, have denied freedom and fundamental principles. the study aims to analyze how that legal, institutional and economic model has been able to establish itself, at least until its contradictions and its legal and economic fictions have emerged.
Effect of air-absorbed oxygen and moisture on the chemical stability of photoexcitedMg,ZnandEuphthalocyanines in dimethylformamide
2006
Absorption of oxygen and moisture from air by MPc-DMF systems was studied and related to the molecular stability demonstrated by phthalocyanine complexes (unsubstituted MPc's : MgPc , ZnPc and EuPc2; Pc = phthalocyanine ligand, C32H16N8) subjected to UV irradiation. A lower stability of air-exposed dimethylformamide solutions is observed and is due to a specific affinity for molecular oxygen revealed by the Pc macrocycle. SEM results proved oxygen molecules fixed to the phthalocyanine solids by forces strong enough to sustain desorption under vacuum. Absorption curves determined for MPc-DMF systems also indicate oxygen accommodated by the phthalocyanine moiety. This explains the predominant…
Latvijas Universitātes izlaidumi fotoliecībās
2020
Latvijas Universitātes Muzejs par godu izlaidumu sezonai piedāvā iepazīt Latvijas Universitātes Muzeja Latvijas Universitātes vēstures kolekcijās, Latvijas Universitātes foto arhīvā un personīgajos foto albumos esošās izlaiduma fotogrāfijas. Izlaidums universitātē ir svinīgs akts, kur visi vienas fakultātes studiju programmu absolventi pēc veiksmīgi nokārtotiem gala pārbaudījumiem un studiju noslēguma darba aizstāvēšanas saņem Latvijas Universitātes diplomus. Tradicionāli izlaidumi norisinās Alma Mater sirdī (Lielajā aulā) skaistākajā vasaras laikā jūnijā un jūlijā.
Pa pēdām Aristotelim
2019
Virtuālā izstāde "Pa pēdām Aristotelim" veltīta jaunā studiju gada sagaidīšanai un vēsturiskam atskatam par studentu svētkiem "Aristotelis". Izstādē apskatāmas fotogrāfijas, kurās attēlota svētku gaita no to rašanās līdz pat mūsdienām, kā arī informācija par svētku dibināšanu un svētku norisi.
Studentu dziesmu un deju festivāls “Gaudeamus” dalībnieku atmiņās
2021
Izstādi “Studentu dziesmu un deju festivāls “Gaudeamus” dalībnieku atmiņās” veido bijušo un esošo Latvijas Universitātes pašdarbības kolektīvu dalībnieku fotogrāfijas no dažādiem svētkiem un ar svētkiem saistītām aktivitātēm – mēģinājumiem, svētku gājieniem un koncertiem. Tāpat izstādē iespējams iepazīties ar bijušā Deju folkloras kopas “Dandari” dalībnieka Aivara Narvaiša iespaidiem par “Gaudeamus” svētkiem, nelielu izstādē apskatāmo svētku vēsturi un interesantāko informāciju, kā arī festivāla “Gaudeamus” hronoloģiju.