Search results for "LOD"

Zvaigžņotā Debess: 2008, Pavasaris

2008

Latvijas Zinātņu akadēmija, Latvijas Universitāte

Psihosociālie riski un farmaceitu darba slodze. Prenventīvie pasākumi

2015

Maģistra darbs ―"Psihosociālie riski un farmaceitu darba slodze. Preventīvie pasākumi" uzrakstīts uz 71 lpp., tajā ir 22 attēli un viens pielikums. Maģistra darbā tika pētīti, galvenokārt, psihosociālie riski un darba slodzes ietekme uz farmaceitu darbaspējām un veselību. Darbs sastāv no trīs daļām. Pirmajā daļā ir analizēta pieejamā literatūra par pētāmo tēmu. Otrajā daļā tiek aprakstītas pētījumā izmantotās metodes. Trešajā daļā ir analizēti un iztirzāti pētījuma rezultāti. Literatūras apskats liecina, ka strādājošie pakalpojumu sfērā, tai skaitā, farmaceiti ir pakļauti psihosociālajiem riskiem, galvenokārt stresam un izdegšanas sindroma riskam. Darbā tika izmantoti divi mūsdienās populār…

Latvijas Vēstures Institūta Žurnāls. 2016, Nr. 4 (101)

2016

Valsts kultūrkapitāla fonds

Photosynthesized silver-polyaminocyclodextrin nanocomposites as promising antibacterial agents with improved activity

2016

Ag nanocomposites were prepared by photoreduction of ammoniacal silver acetate in the presence of poly-{6-[3-(2-(3-aminopropylamino)ethylamino)propylamino]}-(6-deoxy)-β-CD (amCD). The obtained systems were characterized by means of various complementary techniques (UV-vis, FT-IR, TEM, SAED). In particular, FT-IR spectroscopy evidenced a partial oxidative degradation of the polyamine branches of the capping auxiliary, due to the fact that these groups function as a sacrificial reducing agent in the photoinduced formation of the Ag metal core. TEM and SAED micrographs showed that the Ag cores possess a relatively low polydispersity and a significantly crystalline character. The Ag–amCD system…

Synergistic Activity of Silver Nanoparticles and Polyaminocyclodextrins in Nanosponge Architectures

2019

Four new composite materials, formed by silver nanoparticles embedded in polyamino-cyclodextrin nanosponge architectures, were designed exploiting the affinity of polyamino-cyclodextrins towards Ag+ ions. These materials were characterized by means of different techniques (thermogravimetry, FT-IR, solid state NMR, SEM, HR-TEM), and tested as catalysts for the reduction of nitroarenes and the oxidative coupling of anilines. The results obtained showed synergistic activity between the supramolecular binding abilities of the nanosponge matrix and the catalytic properties of the metal nanoparticle, and open the way towards the design of new composite smart nanomaterials with improved catalytic …

Antimicrobial effect of cyclodextrin-based nanodevices capable of antibiotic release

2018

FFC-NMR Relaxometric Characterization of Nanosponges for Rationalizing their Adsorption and Release abilities

Synthesis and Characterization of Halloysite-Cyclodextrin Nanosponges for Enhanced Dyes Adsorption

2017

Inorganic-organic nanosponge hybrids based on halloysite clay and organic cyclodextrin derivatives (HNT-CDs) were developed by means of microwave irradiations in solvent-free conditions. The HNT-CDs nanomaterials characterized by FT-IR, TGA, BET, TEM, SEM, DLS, and zeta-potential have showed a hyper-reticulated network which possesses both HNT and cyclodextrin peculiarities. The new HNT-CDs nanosponge hybrids were employed as nanoadsorbents, first choosing Rhodamine B as the dye model, and furthermore for the removal of some cationic and anionic dyes, under different pH values (1.0, 4.54, and 7.4). The collected results showed that the pH solution as well as the electrostatic interactions a…

Nanosponge-C3N4 composites as photocatalysts for selective partial alcohol oxidation in aqueous suspension

2023

A set of four composite materials was prepared, consisting of a nanosponge matrix based on beta-cyclodextrin in which carbon nitride was dispersed. The materials were characterized by the presence of diverse cross-linker units joining the cyclodextrin moieties, in order to vary the absorption/release abilities of the matrix. The composites were characterized and used as photocatalysts in aqueous medium under UV, visible and natural solar irradiation for the photodegradation of 4-nitrophenol, and for the selective partial oxidation of 5-hydroxymethylfurfural and veratryl alcohol to the corresponding aldehydes. The nanosponge-C3N4 composites showed higher activity than the pristine semiconduc…

Reduced graphene oxide/silver nanoparticles/β-cyclodextrin nanosponges composites with improved photocatalytic activity

2023

Significant activity improvement was achieved by associating graphene oxide-silver composite photocatalysts with cyclodextrin-based nanosponge materials, due to the synergistic effect provided by the supramolecular host abilities of the nanosponge. Three photocatalysts were prepared, fully characterized (FT-IR, ss-NMR, Raman, XRD, SEM, EDX, AFM, ICP, TGA, potentiometric titration), and tested for the oxidative photodegradation of some dyes and phenols, chosen as model organic pollutants. Compared to the unsupported photocatalyst, the nanosponge-based materials showed enhanced performances (being able to carry out the degradation even of dyes which do not react in the presence of the unsuppo…