Search results for "icp"
showing 10 items of 139 documents
Human primary macrophages scavenge AuNPs and eliminate it through exosomes. A natural shuttling for nanomaterials.
2018
Abstract The use of nanomaterials is increasing but the real risk associated with their use in humans has to be defined. In fact, nanomaterials tend to accumulate in organs over a long period of time and are slowly degraded or eliminated by the body. Exosomes are nanovesicles actively shuttle molecules, including chemical products and metals, through the body. Macrophages scavenge the body from both organic and inorganic substances, and they use to release high amounts of exosomes. We hypothesized that macrophages may have a role in eliminating nanomaterials through their exosomes. We treated human primary macrophages with 20 nm gold nanoparticles (AuNPs), analyzing the presence of AuNPs in…
Nanodaļiņu noteikšana ar viendaļiņu induktīvi saistītās plazmas masspektrometrijas metodi pārtikas produktos
2021
Nanodaļiņu noteikšana ar viendaļiņu induktīvi saistītās plazmas masspektrometrijas metodi pārtikas produktos. Nečiporenko A., zinātniskais vadītājs Dr.chem. prof. Vadims Bartkevičs. Maģistra darbs, 46 lappuses, 24 attēli, 17 tabulas, 64 literatūras avoti, 13 pielikumi. Latviešu valodā. Darbā apkopota zinātniskā literatūra par nanodaļiņām, kas ietver to īpašības, toksiskumu, izplatību, pielietojumu, noteikšanas metodes un izmantošanu pārtikā. Literatūras daļā ir ietverts apkopojums par TiO2, Ag, ZnO un SiO2 nanodaļiņām. Darbā ir veikta TiO2, Ag, ZnO un SiO2 nanodaļiņu noteikšana pārtikas produktos ar SP-ICP-MS metodi, kā arī SP-ICP-MS instrumentālās metodes verificēšana ar Au nanodaļiņām.
Svina noteikšanas iespējas asinīs ar instrumentālajām analīzes metodēm, izmantojot dažādus paraugu sagatavošanas veidus
2017
Svina noteikšanas iespējas asinīs ar instrumentālajām analīzes metodēm, izmantojot dažādus paraugu sagatavošanas veidus. Ribkinska L., darba vadītājas Dr. med. Inese Mārtiņsone un Dr. Chem. Agnese Osīte. Maģistra darbs, 45 lappuses, 18 attēli, 12 tabulas, 45 literatūras avoti, 18 pielikumi. Latviešu valodā. Maģistra darbā ir apkopota literatūra par instrumentālajām analīzes metodēm (ETAAS un ICP-MS), paraugu sagatavošanas metodēm un svina toksisko iedarbību uz cilvēka veselību. Eksperimentālajā daļā veikta svina masas koncentrācijas noteikšana asinīs, izmantojot dažādus paraugu sagatavošanas veidus. Paraugu sagatavošanas metodēm veikta to salīdzināšana, kā arī rezultātu pareizības kontrolei…
The Pattern of Rare Earth Elements Like a Possible Helpful Tool in Traceability and Geographical Characterization of the Soil-Olive System (Olea euro…
2022
The identification of a product, with its geographical origin, is a guaranty of the value of the foodstuff and protection from potential fraud. Extra virgin olive oil is produced or marketed as a single variety or a blend of two or more cultivars, often of different geographic origins. Therefore, to study a possible link between the soil and olive oil, we accounted crucial to analyse the behaviour of olive of different cultivars. We studied Rare Earth Elements (REE) amounts and their relationship to trace their distribution from soil to the olive pulp (Olea europea L.). The results obtained pointed out that the different cultivars of Olea did not drive significant differences in reciprocal …
Kinetic and equilibrium studies for uranyl removal from aqueous solution by adsorption onto alginate gel beads. DPV and ICP measurements
2014
ConformalALU: A Conformal Geometric Algebra Coprocessor for Medical Image Processing
2015
Medical imaging involves important computational geometric problems, such as image segmentation and analysis, shape approximation, three-dimensional (3D) modeling, and registration of volumetric data. In the last few years, Conformal Geometric Algebra (CGA), based on five-dimensional (5D) Clifford Algebra, is emerging as a new paradigm that offers simple and universal operators for the representation and solution of complex geometric problems. However, the widespread use of CGA has been so far hindered by its high dimensionality and computational complexity. This paper proposes a simplified formulation of the conformal geometric operations (reflections, rotations, translations, and uniform …
The joint adverse effects of aged nanoscale plastic debris and their co-occurring benzo[α]pyrene in freshwater mussel (Anodonta anatina)
2021
Although the presence of small-scale plastics, including nanoscale plastic debris (NPD, size1 μm), is expected in the environment, our understanding of their potential uptake and biodistribution in organisms is still limited. This mostly is because of the limitations in analytical techniques to characterize NPD in organisms' bodies. Moreover, it is still debatable whether aged NPD can sorb and transfer chemicals into organisms. Here, we apply iron oxide-doped polystyrene nanoparticles (Fe-PS NPs) of 270 nm size to quantify the uptake and biodistribution of NPD in freshwater mussels (Anodonta anatina). The Fe-PS NPs were, first, oxidized using heat-activated potassium persulfate treatments t…
Chemical characterization of ancient liturgical vestment (chasuble) by Inductively Coupled Plasma–Optical Emission Spectrometry (ICP–OES)
2016
Abstract This paper presents the chemical characterization of the yarns of an ancient liturgical vestment (chasuble). The samples have been analyzed for Al, Ag, Au, Cd, Co, Cr, Cu, Ni, Pb and Zn using amounts always less than 1 mg by Inductively Coupled Plasma–Optical Emission Spectrometry (ICP-OES). Except a sample, silver is the most abundant element in all the yarns. In the samples containing silver, it ranged from 68 to 97%. Only two samples contain aluminum. Although the investigated chasuble is recorded in the inventory as an artifact of the XV century, a part of the yarns is composed of materials attributed to later period. In fact, the voluntary use of aluminum in metal alloys is du…
CORROSION RESISTANCE OF DIFFERENT STAINLESS STEEL GRADES IN FOOD AND BEVERAGE INDUSTRY
2020
Fast offline data reduction of laser ablation MC-ICP-MS Sr isotope measurements: Via an interactive Excel-based spreadsheet 'SrDR'
2020
Strontium isotopes are applied to a wide range of scientific fields and to different types of sample materials, providing valuable information foremost about provenance and age, but also on diagenetic processes and mixing relationships between different Sr reservoirs. The development of in-situ analytical techniques, such as laser ablation ICP-MS, has improved our understanding of Sr isotope variability in several field of application, because of the possibility to discriminate small-scale changes and their spatial distribution. However, large outputs of Sr isotope data are produced by laser ablation MC-ICP-MS systems, which necessitate of multiple offline steps to correct and assess the da…