758 results match your criteria: "Riga Technical University.[Affiliation]"
Heliyon
January 2025
Institute of Chemistry, University of Tartu, 14a Ravila St., 50411, Tartu, Estonia.
Elevated concentrations of pharmaceutically active compounds (PhACs) in the water bodies are posing a serious threat to the aquatic microbiota and other organisms. In this context, anaerobic ammonium oxidizing (anammox) bacteria carry a great potential to degrade PhACs through their innate metabolic pathways. This study investigates the influence of short-term exposure to lower and higher concentrations (0.
View Article and Find Full Text PDFPolymers (Basel)
December 2024
Department of Innovation Engineering, Ukrainian State University of Science and Technologies, 2 Lazariana Avenue, 49000 Dnipro, Ukraine.
The current research is devoted to integrating naturally renewable cardanol derivatives into one-component silyl-terminated-polyether-based prepolymer systems to improve climatic resistance and obtain materials with versatile mechanical properties that could be significant to various sectors of the economy. Various cardanol-type products are used in industries that require high climatic resistance, and thus combining cardanol with commercially available silyl-terminated polyether prepolymers would improve its material climatic resistance, maintaining its market and application value as well as improving material sustainability. The results obtained in this work show that depending on how the cardanol prepolymer Ultra Lite 513 is modified, it is possible to increase the elasticity (670%) or tensile strength (104%) of the material as well as significantly increase the climatic resistance of the material, thus improving the quality and sustainability of the adhesive compared to existing silyl-terminated-prepolymer-based adhesives on the market.
View Article and Find Full Text PDFPolymers (Basel)
December 2024
Faculty of Civil and Mechanical Engineering, Aeronautics, Space Engineering and Transport Institute, Riga Technical University, LV-1011 Riga, Latvia.
This study investigates the potential of reusing punched-steel waste, a significant component of solid inorganic waste, in composite materials for construction applications. Driven by the growing global demand for raw materials (which is projected to quadruple by 2050) and the need for sustainable waste management practices, this research explores the creation of a composite material (PPLK) incorporating punched-steel tape (LPM-4 grade) embedded in a polypropylene matrix. Experimental testing of PPLK specimens (310 × 90 × 6.
View Article and Find Full Text PDFMaterials (Basel)
December 2024
Institute of Materials and Surface Engineering, Faculty of Natural Science and Technology, Riga Technical University, Paula Valdena st. 3/7, LV-1048 Riga, Latvia.
Sintered porous mullite-alumina ceramics are obtained from the concentrated suspension of powdered raw materials such as kaolin, gamma and alpha AlO, and amorphous SiO, mainly by a solid-state reaction with the presence of a liquid phase. The modification of mullite ceramic is achieved by the use of micro- and nanosize TiO powders. The phase compositions were measured using an X-ray powder diffraction (XRD) Rigaku Ultima+ (Tokyo, Japan) and microstructures of the sintered specimens were analysed using scanning electron microscopy (SEM) Hitachi TM3000-TableTop (Tokyo, Japan).
View Article and Find Full Text PDFMaterials (Basel)
December 2024
Institute of Solid State Physics, University of Latvia, 8 Kengaraga Street, LV-1063 Riga, Latvia.
Surface modification is essential in microfluidic applications due to the inherent hydrophobicity of polymers, which can lead to biofouling and reagent denaturation. Despite the development, challenges such as hydrophobic molecule absorption and limitations in scaling are still present. Off-stoichiometry thiol-ene (OSTE) materials have emerged as a promising alternative, offering advantages like rapid prototyping, minimal hydrophobic absorption, and customizable surface chemistries.
View Article and Find Full Text PDFMaterials (Basel)
December 2024
Latvian State Institute of Wood Chemistry, Dzerbenes iela 27, LV 1006 Riga, Latvia.
In this study, different combinations of mycelium biocomposites (MBs) were developed using primary substrates sourced from the local agricultural, wood processing, and paper industries. The physicomechanical properties, thermal conductivity, and fire behavior were evaluated. The highest bending strength was achieved in composites containing waste fibers and birch sanding dust, with a strength competitive with that of synthetic polymers like EPS and XPS, as well as some commercial building materials.
View Article and Find Full Text PDFBiomedicines
November 2024
Department of Prosthodontics, School of Dentistry, Faculty of Health Sciences, Aristotle University of Thessaloniki, GR-54124 Thessaloniki, Greece.
, commonly known as absinthe, is a perennial plant with distinctive broad ovate pointed leaves of a silvery-gray color, reaching a height of 1.5 m. The utilization of this herb as a source of natural compounds and as the primary ingredient in the alcoholic beverage absinthe has recently seen a resurgence following a period of prohibition.
View Article and Find Full Text PDFRSC Adv
January 2025
Institute of Chemistry and Chemical Technology, Faculty of Natural Sciences and Technology, Riga Technical University P. Valdena 3 LV-1048 Riga Latvia
Research efforts are increasingly directed towards the development of biodegradable polymers derived from renewable agricultural resources. Polymer blends, which combine multiple polymers, offer enhanced properties such as ductility and toughness while being more cost-effective compared to the development of specialized copolymers. This study examines nine binary and four ternary blends of polylactic acid (PLA), poly(butylene succinate--adipate) (PBSA), and polyhydroxyalkanoate (PHA).
View Article and Find Full Text PDFFront Fungal Biol
December 2024
Water Systems and Biotechnology Institute, Faculty of Natural Sciences and Technology, Riga Technical University, Riga, Latvia.
The growing demand for novel enzyme producers to meet industrial and environmental needs has driven interest in lignocellulose-degrading fungi. In this study, lignocellulolytic enzyme production capabilities of environmental fungal isolates collected from boreal coniferous and nemoral summer green deciduous forests were investigated, using Congo Red, ABTS, and Azure B as indicators of cellulolytic and ligninolytic enzyme productions. Through qualitative and quantitative assays, the study aimed to identify promising species for lignocellulose-degrading enzyme secretion and assess their potential for biotechnological applications.
View Article and Find Full Text PDFNanomaterials (Basel)
December 2024
Institute of Photonics and Nanotechnology, Faculty of Physics, Vilnius University, Saulėtekio Ave. 3, 10257 Vilnius, Lithuania.
We elaborate a method for determining the 0D-1D nanostructure size by photoluminescence (PL) emission spectrum dependence on the nanostructure dimensions. As observed, the high number of diamond-like carbon nanocones shows a strongly blue-shifted PL spectrum compared to the bulk material, allowing for the calculation of their top dimensions of 2.0 nm.
View Article and Find Full Text PDFJ Biomed Mater Res B Appl Biomater
January 2025
CPP SAS, Divonne-Les-Bains, France.
The first workshop on the "latest advances in biomedical applications of octacalcium phosphate (OCP)" was organized as a satellite symposium to the Bioceramics33 conference in Solothurn, Switzerland, in October 2023. The event brought together leading researchers and industry representatives to present and discuss their latest groundbreaking research aimed at developing and commercializing advanced OCP-based biomaterials for bone regeneration. The topics presented by the six invited speakers ranged from a fundamental understanding of the OCP crystal chemistry to advanced processing and characterization methods, functionalization, biomineralization, and commercialization.
View Article and Find Full Text PDFBioresour Technol
December 2024
Riga Technical University, Institute of Energy Systems and Environment, Azenes str. 12/1, Riga LV-1048, Latvia.
Emerging research highlights the potential of specific light spectral regions to significantly enhance microalgae biomass production compared to conventional white light illumination. However, conflicting results of existing studies on the most optimal wavelengths reveal a knowledge gap regarding the underlying factors for optimal spectrum. The present paper aims to address this gap by critically analyzing existing studies on light spectral quality and its impact on microalgae growth.
View Article and Find Full Text PDFEJNMMI Radiopharm Chem
December 2024
CERN, Geneva, Switzerland.
Background: In the field of medical and scientific research, radionuclides are used to investigate various physiological and pathological processes. PRISMAP - the European medical radionuclide programme was created to bring together production facilities including intense neutron sources, an isotope mass separation facility, high-power accelerators, biomedical research institutes, and hospitals to support medical research. The aim of this article is to introduce readers with the current status of innovative radionuclides in Europe.
View Article and Find Full Text PDFJ Biomed Mater Res A
January 2025
Department of Biomaterials, Institute of Clinical Dentistry, Faculty of Dentistry, University of Oslo, Oslo, Norway.
The eggshell membrane (ESM), resembling the extracellular matrix (ECM), acts as a protective barrier against bacterial invasion and offers various biofunctions due to its porous structure and protein-rich composition, such as ovalbumin, ovotransferrin, collagen, soluble protein, and antimicrobial proteins. However, the structure of ESM primarily comprises disulfide bonds and heterochains, which poses a challenge for protein solubilization/extraction. Therefore, the method of dissolving and extracting bioactive protein components from ESM has significant potential value and importance for exploring the reuse of egg waste and environmental protection.
View Article and Find Full Text PDFHeliyon
December 2024
Water Systems and Biotechnology Institute, Faculty of Natural Sciences and Technology, Riga Technical University, Kipsalas 6a, Riga, Latvia.
Municipal sewage sludge, a by-product of wastewater treatment plants, presents environmental challenges due to its complex composition. Particular concern is the lipophilic and aliphatic compounds that pose risks to the environment and human health. This study focuses on the efficient removal of those compounds from sewage sludge using several organic solvents (hexane, toluene, chloroform, dichloromethane, acetone, hexane-methanol mixture, ethanol, and methanol) and ionic liquids (ILs) like tetrakis(hydroxymethyl)phosphonium chloride and 1-ethyl-3-methylimidazolium acetate by solvent extraction techniques.
View Article and Find Full Text PDFMaterials (Basel)
December 2024
Faculty of Materials Science and Applied Chemistry, Institute of Polymer Materials, Riga Technical University, 3/7 Paula Valdena Street, LV-1048 Riga, Latvia.
Using a pilot-scale chamber with an interior capacity of 340 L, European aspen () wood boards were thermally modified (TM) under pressure in nitrogen at a maximum temperature of 160-170 °C, for 60-180 min, and with an initial nitrogen pressure of 4-5 bar. After the TM process, aspen wood was characterised by dimensional changes, mass loss (ML), equilibrium moisture content (EMC), antiswelling efficiency (ASE), cell wall total water capacity (CWTWC), modulus of rupture (MOR), modulus of elasticity (MOE), and Brinell hardness (BH). This work offers fresh insights into the characteristics of aspen wood following a closed TM process in pressurised nitrogen.
View Article and Find Full Text PDFMaterials (Basel)
December 2024
Institute of Sustainable Building Materials and Engineering Systems, Faculty of Civil and Mechanical Engineering, Riga Technical University, Kipsalas Str. 6A, LV-1048 Riga, Latvia.
Cement-bonded particle boards are gaining popularity globally due to their durability, strength, and, more importantly, environmental sustainability. The increasing demand for these materials has also created the necessity for the sustainable recycling of these materials. In this study, the potential to recycle wood-wool cement board (WWCB) waste into new lightweight insulation biocomposite material was examined.
View Article and Find Full Text PDFBiomacromolecules
January 2025
Polymer Chemistry and Biomaterials (PBM) Group, Centre of Macromolecular Chemistry (CMaC), Department of Organic and Macromolecular Chemistry, Faculty of Sciences, Ghent University, Krijgslaan 281, Building S4, Ghent 9000, Belgium.
Hydroxyapatite (HAP) and amorphous calcium phosphate (ACP) nanoparticles were incorporated into a thiol-ene clickable gelatin network to elucidate to what extent osteogenic differentiation of human dental pulp- and adipose-derived stem cells (HDPSCs/HASCs) could be further boosted. ACP nanoparticles increased the specific surface area by 23% and reduced the density by 13% while maintaining a comparable particle size (ACP: 25 ± 3 nm; HAP: 27 ± 3 nm). Overall, the incorporation of ceramic nanoparticles did not significantly alter the mechanical properties of the ceramic-containing composites compared to the unsubstituted thiol-ene network.
View Article and Find Full Text PDFDentomaxillofac Radiol
December 2024
Diplomate ABOMR, Professor, Division of Diagnostic Sciences, Director, Oral & Maxillofacial Radiology Predoctoral Program, Section of Oral and Maxillofacial Radiology, Address: 5405 Koury Oral Health Sciences Building, UNC Adams School of Dentistry, Chapel Hill, North Carolina, 27599-7450.
Title: The Influence of a Deep Learning Tool on the Performance of Oral and Maxillofacial Radiologists in the Detection of Apical Radiolucencies.
Objectives: This study aimed to assess the impact of a deep learning model on oral radiologists' ability to detect periapical radiolucencies on periapical radiographs. The secondary objective was to conduct a regression analysis to evaluate the effects of years of experience, time to diagnose, and specialty.
Environ Sci Pollut Res Int
January 2025
Department of Environmental Science, University of Latvia, Jeglavas Street 1, Riga, LV-1004, Latvia.
Microplastics (MPs) have become a critical pollutant, accumulating in aquatic ecosystems and posing significant environmental and human health risks. Approximately 5.25 trillion plastic particles float in global oceans, releasing up to 23,600 metric tonnes of dissolved organic carbon annually, which disrupts microbial dynamics.
View Article and Find Full Text PDFEur Phys J C Part Fields
December 2024
Scientifica (Cairo)
November 2024
Institute of Energy Systems and Environment, Riga Technical University, Azenes Street 12/1, LV 1048, Riga, Latvia.
Due to population growth and climate changes, there is a rising need for alternative food and protein sources to reduce protein scarcity and the environmental impact of food industries. Single-cell proteins (SCPs) have the potential to partially or fully substitute plant- and animal-derived dietary proteins. is an appealing bacterium for SCP production because of its fast growth and ability to obtain high protein and essential amino acid (AA) content in its biomass.
View Article and Find Full Text PDFSci Rep
December 2024
Department of Civil Engineering, ISISE, ARISE, University of Minho, Guimarães, Portugal.
The construction industry significantly impacts the environment through natural resource depletion and energy consumption, leading to environmental degradation. Circular Economy (CE) material efficiency strategies-such as material reuse, design for disassembly, prefabrication, and recycling-offer promising solutions for reducing resource consumption and waste. This paper explores stakeholders' perspectives on the costs and benefits of implementing CE material efficiency strategies in the construction industry, using the 3-R (Reduce, Reuse, Recycle) framework.
View Article and Find Full Text PDFHeliyon
November 2024
Institute of Biomaterials and Bioengineering, Faculty of Natural Sciences and Technology, Riga Technical University, Riga, Latvia.
Calcium phosphate (CaP) biomaterials have been widely used in hard tissue engineering, but their impact on cell metabolism is unclear. We synthesized and characterized hydroxyapatite, β-tricalcium phosphate, and biphasic calcium phosphate composites to investigate material effects on NIH/3T3 cell metabolism. The intracellular metabolites were analyzed employing LC-MS metabolomics, and cell metabolic status was assessed comparatively.
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