In vitro cellular activity of maghemite/cerium oxide magnetic nanoparticles with antioxidant properties.

Magnetic γ-FeO/CeO nanoparticles were obtained by precipitation of Ce(NO) with ammonia in the presence of γ-FeO seeds. The formation of CeO nanoparticles on the seeds was confirmed by transmission electron microscopy linked with selected area electron diffraction, energy-dispersive X-ray spectroscopy, electron energy loss spectroscopy, and dynamic light scattering. The γ-FeO/CeO particle surface was functionalized with PEG-neridronate to improve the colloidal stability in PBS and biocompatibility.

Elementary autonomous surface microfluidic devices based on laser-fabricated wetting gradient microtextures that drive directional water flows.

Topography-dependent tuning of water wettability was achieved on a stainless steel surface textured by nanosecond-laser pulses at different laser fluences, with the minimal contribution of the surface chemical modification. Such differently-wet neighboring surface spots were demonstrated to drive an autonomous directional water flow. A series of elementary microfluidic devices based on the spatial wetting gradients were designed and tested as building blocks of "green", energy-saving autonomous microfluidic circuits.

Formation of the Submicron Oxidative LIPSS on Thin Titanium Films During Nanosecond Laser Recording.

Laser-induced periodic surface structures (LIPSSs) spontaneously appearing on the laser-treated (melted or evaporated) surfaces of bulk solid materials seem to be a well-studied phenomenon. Peculiarities of oxidative mechanisms of LIPSS formation on thin films though are far less clear. In this work, the appearance of oxidative LIPSSs on thin titanium films was demonstrated under the action of commercially available nanosecond-pulsed Yb-fiber laser.

Cerium Oxide-Decorated γ-FeO Nanoparticles: Design, Synthesis and Effects on Parameters of Oxidative Stress.

Magnetic γ-FeO/CeO nanoparticles were obtained by basic coprecipitation/oxidation of iron chlorides with hydrogen peroxide, followed by precipitation of Ce(NO) with ammonia. The appearance of CeO on the magnetic particle surface was confirmed by X-ray photoelectron spectroscopy (XPS), powder X-ray diffraction (XRD), and elemental analysis; a magnetometer was used to measure the magnetic properties of γ-FeO/CeO. The relatively high saturation magnetization of the particles (41.

The negative effect of magnetic nanoparticles with ascorbic acid on peritoneal macrophages.

Superparamagnetic iron oxide nanoparticles (SPIOn) are widely used as a contrast agent for cell labeling. Macrophages are the first line of defense of organisms in contact with nanoparticles after their administration. In this study we investigated the effect of silica-coated nanoparticles (γ-FeO-SiO) with or without modification by an ascorbic acid (γ-FeO-SiO-ASA), which is meant to act as an antioxidative agent on rat peritoneal macrophages.

High-resolution large-scale plasmonic laser color printing for jewelry applications.

We offer to use optical features of surface plasmon resonance in Ag nanoparticles for jewelry application as a method for the well-controlled decoration of silver items. The novel approach of silver nanoparticles formation with sizes from 5 to 50 nm via nanosecond direct laser writing allows for controlling the reflectance spectra, thus creating a color image on precious metals with a high resolution of about 450 dpi without dyes or hazardous chemicals. Moreover, the large-scale color image can be applied in single-step processing with significant productivity of 2 cm per minute.

Controlled nanostructures formation on stainless steel by short laser pulses for products protection against falsification.

The coloration of stainless steel surface due to the formation of spatially periodic structures induced by laser pulses of nanosecond duration is demonstrated. The period of microstructures corresponds to the laser wavelength, and their orientation angle depends on the adjustment of laser polarization. The marking algorithm for the development of authentication patterns is presented.

Biological evaluation of surface-modified magnetic nanoparticles as a platform for colon cancer cell theranostics.

Magnetic nanoparticles offer multiple possibilities for biomedical applications. Besides their physico-chemical properties, nanoparticle-cellular interactions are determinant for biological safety. In this work, magnetic nanoparticles were synthesized by one-shot precipitation or two-step reaction and coated with biocompatible polymers, such as poly(l-lysine) and poly(N,N-dimethylacrylamide-co-acrylic acid), and carbohydrates, like l-ascorbic acid, d-galactose, d-mannose, and sucrose.

Carbohydrate-modified magnetic nanoparticles for radical scavenging.

Maghemite (gamma-Fe2O3) nanoparticles, 12 nm in size, were prepared by co-precipitation of Fe(II) and Fe(III) chlorides with ammonium hydroxide and oxidation with hydrogen peroxide. To achieve stability and biocompatibility, obtained particles were coated with silica, to which glucose and ascorbic acid were bound by different mechanisms. The composite particles were thoroughly characterized by transmission electron microscopy, dynamic light scattering, elemental analysis, and FT-Raman and fluorescence spectroscopy to determine composition, morphology, size and its distribution, zeta-potential, and scavenging of peroxyl and hydroxyl radicals.

[The clinical significance of a combination of dysplastic scoliosis with hemostatic system disorders].

Examined were 74 patients ranging in age from 6 to 48 years with dysplastic scoliosis. Disorders in the system of hemostasis were revealed in 67 patients. Including the 25 operated ones.

[Interaction of spin-labeled saturated and unsaturated fatty acid derivatives with biological membrane lipid and protein components].

Interaction of saturated and unsaturated derivatives of spin-labelled fatty acids (2,2,6,6-tetramethyl-4-palmitoylpiperidil-l-oxyl (I) and synthetized by us 2,2,6,6-tetramethyl-4-oleoylpiperidil-1-oxyl (II) with sarcoplasmic reticulum membranes, retina rod outer segments and erythorocyte ghosts was studied. ESR spectra of the probe I are practically unresolved singlets, whereas ESR spectra of the probe II appear as more of less resolved triplet signals. The difference in ESR spectra of the probes I and II is the result of distribution of the probe I in pure lipid regions of membranes, the probe II being located both in lipid bilayer and hydrophobic areas of proteins.