Search results for "Nano"

Statistical Approximation of Fourier Transform-IR Spectroscopy Data for Zinc White Pigment from Twentieth-Century Russian Paintings

2017

We present a statistical model for approximation of experimental Fourier transform-IR spectroscopy (FTIR) data for paint samples from paintings of different ages. The model utilizes random variations in some parameters (initial ageing rate, degree of change in ageing rate and time at which the change occurs). We determine the parameters characterizing variation in the paint composition and the storage conditions for the paintings. The numerical calculation is qualitatively consistent with the experimental data. In the proposed model, changes in the initial composition of the paint and the storage conditions make about the same contribution to the experimentally observed scatter in the data …

Äänenhuoltokurssin vaikutus liikunnanopettajaksi opiskelevien äänenkäyttöön

2007

Jauna pieeja prostatas vēža cirkulējošu ekstracelulāro vezikulu selektīvai izolēšanai un to ietverto RNS biomarķieru analīze

2021

Audzēju producētās ekstracelulārās vezikulas (EVs) ir ieguvušas ievērojamu uzmanību zinātnieku vidū pēdējo gadu laikā, kā daudzsološs biomarķieru avots ar potenciālu pielietojumu vēža diagnostikā, prognostikā un monitorēšanā. Pacientu biofluīdos cirkulējošo EV izmantošanu šiem mērķiem apgrūtina tas, ka vēža izcelsmes EVs bieži sastāda zemu proporciju no kopējā parauga EV satura un šī proporcija mēdz atšķirties pacientu starpā. Tādēļ vajadzīgs meklēt jaunas pieejas, kas ļautu selektīvi izolēt un analizēt noteiktas EV subpopulācijas, kas bagātinātas ar vēža izcelsmes biomarķieriem. Adresējot šo aktualitāti, bakalaura darbā tika attīstīta un testēta jauna EV subpopulāciju izolēšanas metode – a…

EVALUATION OF BIODEGRADABILITY ON POLYSPARTAMIDE-POLYLACTIC ACID BASED NANOPARTICLES BY CHEMICAL HYDROLYSIS STUDIES POLYMER DEGRADATION AND STABILITY

2015

Here, the synthesis of two graft copolymers based on α,β-poly(N-2-hydroxyethyl)-D,L-aspartamide (PHEA) and poly(lactic acid) (PLA), the O-(2-aminoethyl)-O′-galactosyl polyethylene glycol (GAL-PEG-NH2) or the methoxypolyethylene glycol amine (H2N-PEG-OCH3) is described. Starting from the obtained PHEA-PLA-PEG-GAL and PHEA-PLA-PEG copolymers, polymeric nanoparticles were prepared by high pressure homogenization–solvent evaporation method. To demonstrate their biodegradability as a function of the matrix composition, a chemical stability study was carried out until 21 days by incubating systems in two media mimicking physiological compartments (pH 7.4 and pH 5.5). The degradability of both nan…

Evaluation of biodegradability of novel polymeric nanoparticles based on amphiphilic polylactide-polyaspartamide derivatives.

2015

Photoluminescence properties of S2 molecule trapped in Melanophlogite

2015

We studied the photoluminescence properties of a sample of SiO2-clathrate Melanophlogite, a crystalline microporous material which is found in nature as a rare mineral. Upon β irradiation, the material displays an intense light emission under near-UV illumination. We studied in detail this optical activity by steady-state and time-resolved photoluminescence measurements as a function of temperature. The spectroscopic properties we find can be ascribed to a population of quasi-free molecules trapped within each of the two different types of cage available in the structure of this clathrate, although the spectroscopic properties of the guest molecules are affected by their interactions with t…