A5065352468- Semiconductor materials and devices
- Diamond and Carbon-based Materials Research
- Metal and Thin Film Mechanics
- Microfluidic and Bio-sensing Technologies
- Genomics and Chromatin Dynamics
- Fusion materials and technologies
- Molecular Junctions and Nanostructures
- Graphene research and applications
- Carbon Nanotubes in Composites
- Skin and Cellular Biology Research
- Advancements in Semiconductor Devices and Circuit Design
- High Entropy Alloys Studies
- Thermal properties of materials
- 3D Printing in Biomedical Research
- Nanoparticle-Based Drug Delivery
- Calcium Carbonate Crystallization and Inhibition
- Cardiovascular and Diving-Related Complications
- Copper Interconnects and Reliability
- Nanoparticles: synthesis and applications
- DNA and Nucleic Acid Chemistry
- Ga2O3 and related materials
- Protein Interaction Studies and Fluorescence Analysis
- Electromagnetic Fields and Biological Effects
- Cardiac tumors and thrombi
- Nanowire Synthesis and Applications
Riga Technical University
2018-2024
Riga Stradiņš University
2017
This article is focusing on electrical functionalization of biomaterial’s surface to enhance its biocompatibility. It an overview previously unpublished results from a series experiments concerning the effects can have biological systems. Saccharomyces cerevisiae cells were used for experiments. The hydroxyapatite (HAp) specimens investigate influence structural point defects charge. Threshold photoelectron emission spectroscopy was measure electron work function HAp and biologic samples....
The chromatin observed by conventional electron microscopy under the nuclear envelope constitutes a single layer of dense 30-35 nm granules, while ∼30 fibrils laterally attached to them, form large patches lamin-associated domains (LADs). This particular surface "epichromatin" can be discerned specific (H2A+H2B+DNA) conformational antibody at inner and around mitotic chromosomes. In order differentiate DNA conformation peripheral we applied an Acridine orange (AO) structural test involving...
This study examines the electrical properties and layer quality of field emission microtriodes that have planar electrode geometry are based on tungsten (W) silicon dioxide (SiO2). Two types were analyzed: one with a multi-tip cathode fabricated using photolithography (PL) other single-tip focused ion beam (FIB). Atomic force microscopy (AFM) analysis revealed surface roughness W in order several nanometers (Ra = 3.8 ± 0.5 nm). The work function values Si substrate, SiO2 layer, estimated...
An interesting development of biotechnology has linked microbial cell immobilisation with nanoparticles. The main task our research was to reveal the possible influences differently electrically charged diamond nanoparticles upon physiological characteristics yeast Saccharomyces cerevisiae. It revealed that adverse impact these can manifest not only against prokaryotes, but also eukaryotic cells. However, obtained results indicate it is reduce and, most likely, completely eliminate dangerous...
The paper deals with the evolution of microstructure AlSi10Mg alloy obtained by laser powder bed fusion (LPBF), as a function post-processing heat treatment temperature. This was approached complementary methods including FE-scanning electron microscopy, scanning Kelvin probe force microscopy and exo-electron emission techniques. fast cooling rate LPBF process compared to traditional casting produces very fine high mechanical properties corrosion resistance. However, LPBF-AlSi10Mg can be...
Nanolayered coatings are proposed for use in microelectronic devices where the size/performance ratio is becoming increasingly important, with aim to achieve existing quality requirements while reducing size of and improving their ability perform stably over multiple cycles. Si-SiO2-W structures have been as a potential material fabrication devices. However, before such materials can be implemented devices, properties need carefully studied. In this study, nanolayered were fabricated...
Abstract Insulin and immunoglobulin therapy is commonly administered through injections that are invasive painful. They cannot be taken orally because digestive enzymes break them down. To protect against enzymes, drug molecules may “packed”, which decreases interaction of the active surface molecule with environment. Silica nanoparticles (SiO 2 ) used to attach proteins like insulin or for use in delivery. stable biocompatible. Exposing SiO UV radiation control molecule–nanoparticle...
Magnetron sputtered tungsten and diboride nanofilms are proposed to be used in microelectronic devices. Methods of deposition for on oxidized silicon followed by etching is among the techniques applied production. However, physical-chemical interactions between various films need taken into account. Therefore, a complete surface in-depth characterization synthesized necessary. Tungsten deposited magnetron sputtering technique, plasma chemical etching. Characterization structures separated...
Multilayer Si <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> N xmlns:xlink="http://www.w3.org/1999/xlink">4</sub> consisting of nanolayers with the total thickness 60 nm was deposited layer-by-layer in a low-pressure chemical vapor deposition process. Compared single-layer , multilayer had one-third less oxygen concentration at interfaces. This decreased density electrically active centers traps and improved quality nanocapacitors dielectric.
Abstract Cell attachment is of paramount importance in implant design, bioreactor tissue engineering and the design non-fouling surfaces. Surface roughness a significant factor that affects cell attachment. To explore impact characteristics, micromachining approaches can be used to fabricate surfaces with controlled microscale topography. When optical microscopy employed study optically opaque micropatterned surfaces, one needs separate area an image coated cells from background. Manual...
We present the results of first morphological study a Gore® HELEX® Septal Occluder 30 mm that was explanted seven years after interventional implantation due to significant left-to-right shunt (7 mm) which resulted from stretching concomitant patent foramen ovale by occluder atrial septal defect closure. Complete endothelialization surface device, formation connective tissue around implant, minor chronic inflammation, appearance foreign body giant cells and weakened myocardial adjacent...
In the divertor of tokamak type fusion reactors tungsten and tungsten-covered plasma facing materials are currently among selected materials. However, metallic, high-Z require mitigation. Recent researches show, that mitigation with boron can be used for optimizing operations, while interactions between containing less investigated. The formation mixed layers their behaviour under operations as well reactor maintenance procedures needs to estimated. order estimate properties tungsten-boron...
Abstract The aim of the study was to find out whether it is possible detect human magnetic field without shielding using sensors. For this, an experiment “the possibility detecting sensors” conducted. During found that with help a low-field detector register person’s field, which changing if there change in heart rate. study, device for recording assembled, methodology obtaining data developed, description materials and equipment used provided. In accordance described methods collection,...
The ability of cells to adhere substrates is an important factor for the effectiveness biotechnologies and bioimplants. This research demonstrates that statistical distribution sizes (Saccharomyces cerevisiae) attached substrate surface correlates with electrical potential on substrate's surface. Hypothetically, this behavior should be taken into consideration during processing surfaces when cell adhesion based size required.