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Search results for: MAGNESIUM BIODEGRADABLE IMPLANTS
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Polymer biodegradable coatings as active substance release systems for urological applications
PublicationCatheter-associated urinary tract infections are the result of catheterization of the bladder. The risk of infection is directly proportional to the length of the bladder catheterization. Bacteria cells have the ability to adhere and create the biofilm on the surface of catheter materials. Bacteria’s biofilm is an extremely beneficial environment of existence for microorganisms. Microorganisms that are an integral part of the biofilm...
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High temperature monoclinic-to-tetragonal phase transition in magnesium doped lanthanum ortho-niobate
PublicationMagnesium doped lanthanum ortho-niobate (La0.98Mg0.02NbO4) was prepared by the molten salt synthesis method. X-ray diffraction and dilatometry methods were used to study high temperature behavior of the ceramic material. Special attention was paid to the phase transition between the monoclinic and tetragonal phases. The values of spontaneous strain on the basis of unit cell parameter, obtained by Rietveld refinement, have been...
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Flexural behavior of composite structural insulated panels with magnesium oxide board facings
PublicationThe current report is devoted to the flexural analysis of a composite structural insulated panel (CSIP) with magnesium oxide board facings and expanded polystyrene (EPS) core, that was recently introduced to the building industry. An advanced nonlinear FE model was created in the ABAQUS environment, able to simulate the CSIP’s flexural behavior in great detail. An original custom code procedure was developed, which allowed to include...
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Allergic reactions as a defense of the organism to the influence of implants components made of stainless steel
PublicationDue to the increasing number of cases of hypersensitivity caused by direct contact with metals, as well as the increasing demand for implants in humans all ages numerous studies on the effects of the impact of implant components are being carried out. The paper presents the phenomenon of etiology of allergy in general terms and in relation to the biomaterials used in medicine. There have been characterized in terms of impact on...
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Allergic Reactions as a Defense of the Organism to the Influence of Implants Components Made of Stainless Steel
PublicationDue to the increasing number of cases of hypersensitivity caused by direct contact with metals, as well as the increasing demand for implants in humans all ages numerous studies on the effects of the impact of implant components are being carried out. The paper presents the phenomenon of etiology of allergy in general terms and in relation to the biomaterials used in medicine. There have been characterized in terms of impact on...
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Nanotubular Oxide Layer Formed on Helix Surfaces of Dental Screw Implants
PublicationSurface modification is used to extend the life of implants. To increase the corrosion resistance and improve the biocompatibility of metal implant materials, oxidation of the Ti-13Nb- 13Zr titanium alloy was used. The samples used for the research had the shape of a helix with a metric thread, with their geometry imitating a dental implant. The oxide layer was produced by a standard electrochemical method in an environment of...
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The Effect of Sodium Tetrafluoroborate on the Properties of Conversion Coatings Formed on the AZ91D Magnesium Alloy by Plasma Electrolytic Oxidation
PublicationMagnesium and its alloys are widely used in many areas because of their light weight, excellent dimensional stability, and high strength-to-weight ratio. However, the material exhibits poor wear and corrosion resistance, which limits its use. Plasma electrolytic oxidation (PEO) is an effective surface modification method for producing ceramic oxide layers on Mg and their alloys. The influence of the additions of sodium tetrafluoroborate...
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The role of slowly biodegradable organic compounds in a full-scale biological nutrient removal activated sludge systems
PublicationThe aim of this study was to determine the immediate effects of slowly biodegradable substrates on the denitrification capability and phosphate release/uptake interactions for a full-scale biomass process from two large wastewater treatment plants (WWTPs) located in the cities of Gdansk and Gdynia (northern Poland). Since it is hard to distinguish the slowly biodegradable substrate in a direct way, a novel procedure based on batch...
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Aqueous Molybdate Provides Effective Corrosion Inhibition of WE43 Magnesium Alloy in Sodium Chloride Solutions
PublicationCorrosion and corrosion inhibition of WE43 magnesium alloy were investigated in NaCl solutions containing different amounts of sodium molybdate. Electrochemical, microscopic, and spectroscopic experiments were utilized to examine the mechanism of corrosion inhibition by molybdates. Electrochemical data showed that Na2MoO4 inhibitor provides reliable inhibition at concentrations at and above 100 mM. Raman and XPS spectroscopy demonstrated...
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Degradation of metal implants covered with silver
PublicationSilver was known for its antibacterial properties as long ago as in antiquity. The silver ions have ability to join the bacteria surface. Low density of silver ions Ag+ influence the protons through the bacteria surface, which results in total destruction of the cell. Antibacterial activity of silver remains in proportion with the density of silver ions Ag+ in the environment.
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Microstructural Analysis of Fractured Orthopedic Implants
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In vivo degradation of short-term implants
PublicationStan powierzchni wywiera istotny wpływ na właściwości użytkowe implantu. Stawiane wymagania, zależą od funkcji jakie ma spełniać wszczep oraz rodzaju implantowanego materiału. W przypadku implantów krótkotrwałych wymagana jest przede wszystkim odpowiednia odporność korozyjna, nie powinno tworzyć się trwałe połączenie pomiędzy wszczepem a tkanką kostną.Wszystkie biomateriały ulegają degradacji. Ważne jest to, aby produkty tej degradacji...
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Poly(hydroxybutyrate-co-hydroxyvalerate) as a biodegradable binder in a negative electrode material for lithium-ion batteries
PublicationIn this work, graphite-based negative electrode for lithium-ion battery consisting a novel and biodegradable binder poly(hydroxybutyrate-co-hydroxyvalerate) (PHBV) is compared with standard graphite electrode with polyvinylidene fluoride (PVDF) as a binder. The rate and cycling performance of lithium ion insertion/extraction of electrodes with PHBV in a half-cell configuration are evaluated. Moreover, on the basis of the electrochemical...
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The role of biodegradable particulate and colloidal organic compounds in biological nutrient removal activated sludge systems
PublicationThe efficiency of denitrification and enhanced biological phosphorus removal in biological nutrient removal activated sludge systems is strongly dependent on the availability of appropriate carbon sources. Due to high costs of commercial compounds (such as methanol, ethanol, acetic acid, etc.) and acclimation periods (usually) required, the effective use of internal substrates is preferred. The aim of this study was to determine...
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Structure and properties of magnesium cast alloys
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Modeling hydrolysis of slowly biodegradable organic compounds in biological nutrient removal activated sludge systems
PublicationHydrolysis is an important process in biological wastewater treatment and is known to be the ratelimiting step in organic carbon removal from municipal or industrial wastewater. The influence of the readily biodegradable chemical oxygen demand fraction in biological wastewater treatment systems has been extensively investigated, but little is known about the effects of slowly biodegradable substrate (XS) on denitrification and...
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Edgewise Compressive Behavior of Composite Structural Insulated Panels with Magnesium Oxide Board Facings
PublicationEdgewise compression response of a composite structural insulated panel (CSIP) with magnesium oxide board facings was investigated. The discussed CSIP is a novel multifunctional sandwich panel introduced to the housing industry as a part of the wall, floor, and roof assemblies. The study aims to propose a computational tool for reliable prediction of failure modes of CSIPs subjected to concentric and eccentric axial loads. An advanced...
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Studies on Silver Ions Releasing Processes and Mechanical Properties of Surface-Modified Titanium Alloy Implants
PublicationDispersed silver nanoparticles (AgNPs) on the surface of titanium alloy (Ti6Al4V) and titanium alloy modified by titania nanotube layer (Ti6Al4V/TNT) substrates were produced by the chemical vapor deposition method (CVD) using a novel precursor of the formula [Ag5(O2CC2F5)5(H2O)3]. The structure and volatile properties of this compound were determined using single crystal X-ray diffractometry, variable temperature IR spectrophotometry...
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Hydrothermal Surface Treatment of Biodegradable Mg-Materials
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In vitro toxicity studies of biodegradable, polyelectrolyte nanocapsules
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Porous materials used as inserted bone implants
PublicationArtykul zawiera przegladowa analize literatury dotyczaca scaffoldow
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New techniques assisting cochlear implants fitting.
PublicationW referacie przedstawiono metodę telemetrii odpowiedzi neuronalnej (SoE), którą zastosowano w celu oceny amplitudy sygnału, która będzie wywoływała percepcję słuchową poprzez pobudzenie elektrod implantu ślimakowego. Jest to obiektywna metoda wyznaczania skuteczności systemów implantów ślimakowych.
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Mechanical and Corrosion Properties of Magnesium-Bioceramic Nanocomposites
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Porous Magnesium Based Bionanocomposites For Medical Application
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Advancements in the Additive Manufacturing of Magnesium and Aluminum Alloys through Laser-Based Approach
PublicationComplex structures can now be manufactured easily utilizing AM technologies to meet the pre-requisite objectives such as reduced part numbers, greater functionality, and lightweight, among others. Polymers, metals, and ceramics are the few materials that can be used in AM technology, but metallic materials (Magnesium and Aluminum) are attracting more attention from the research and industrial point of view. Understanding the role...
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Bioactive and biodegradable cotton fabrics produced via synergic effect of plant extracts and essential oils in chitosan coating system
PublicationFunctional antibacterial textile materials are in great demand in the medical sector. In this paper, we propose a facile, eco-friendly approach to the design of antibacterial biodegradable cotton fabrics. Cotton fiber fabrics were enhanced with a chitosan coating loaded with plant extracts and essential oils. We employed Fourier-transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS), UV–Vis spectrophotometry, optical...
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Determinants of the primary stability of cementless acetabular cup implants: A 3D finite element study
PublicationPrimary stability of cementless implants is crucial for the surgical success and long–term stability. However, primary stability is difficult to quantify in vivo and the biomechanical phenomena occurring during the press–fit insertion of an acetabular cup (AC) implant are still poorly understood. The aim of this study is to investigate the influence of the cortical and trabecular bone Young's moduli Ec and Et, the interference...
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Investigations on the Magnesium Status Marker in Humans. The Environmental Variability of the Magnesium Levels in the Hair, Plasma and Erythrocytes of School Children from Poland
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Metal implants in ostheosynthesis - construction solutions, materials and applications
PublicationThe aim of the article is to present two case studies on intramedullary nails. The research included the evaluation of the type of fracture and the analysis of microstructure, chemical composition and hardness of the implant material.
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Characteristics of orthopaedic implants damage and mechanisms of its initiation
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Porous biomaterial for orthopaedic implants based on titanium alloy
PublicationTytan i jego stopy są szeroko stosowane jako biomateriały dla zastosowań ortopedycznych. Badania związane z ich najlepszą odpornością na korozję i ścieranie, biozgodnością i bioaktywnością są stale prowadzone. Obecne badania koncentrują się również na projektowaniu i produkcji materiałów porowatych w oparciu o stopy np. Ti-13Nb-13Zr, które mogą być stosowane do wytwarzania implantów. Jedną z najbardziej efektywnych metod wytwarzania...
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Dual-Setting Bone Cement Based On Magnesium Phosphate Modified with Glycol Methacrylate Designed for Biomedical Applications
PublicationMagnesium phosphate cement (MPC) is a suitable alternative for the currently used calcium phosphates, owing to beneficial properties like favorable resorption rate, fast hardening, and higher compressive strength. However, due to insufficient mechanical properties and high brittleness, further improvement is still expected. In this paper, we reported the preparation of a novel type of dual-setting cement based on MPC with poly(2-hydroxyethyl...
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Evaluation and behaviour of slowly biodegradable substrate on mathematical modelling of oxygen uptake rate in activated sludge systems
PublicationThe effect of the readily biodegradable (Ss) fraction in activated sludge systems has been extensively investigated, but only minor information can be found about the effect of Xs on OUR in activated sludge systems. The aim of this study was to determine the evaluation and behaviour of Xs on mathematical modelling of OUR using ASM2d and its modification. The essential study was divided into two major parts: experimental investigation...
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Structure and electric properties of double magnesium zirconium orthophosphate
PublicationPublikacja przedstawia wyniki pomiarów elektrycznych i strukturalnych ortofosforanu magnezowo-cyrkonowego.
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The Disturbances of Magnesium in Patients With Thromboembolic Complications After a Cholecystectomy
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Cyclodextrin polymers as efficient adsorbents for removing toxic non-biodegradable pimavanserin from pharmaceutical wastewaters
PublicationPresence of even small amount of active pharmaceutical ingredients in the environment carries risks tohuman and animal health, presenting an important issue. The paper presents issues related to the newdrug - pimavanserin (PMV). Biological treatment efficiency of pimavanserin (PMV) was evaluated usinglab-scale Sequencing Batch Reactor (SBR). It has been shown to have a negative effect on aquatic or-ganisms by classifying it as...
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Mechanical compatibility of implants used in hernia repair with abdominal wall
PublicationThe paper deals with a membrane model of a synthetic surgical mesh for treatment of abdominal hernia. The authors analyse the compatibility of two implant types with the human wall: Dualmesh Gore and Proceed. The finite element method is applied to simulate tjhe behavior of the proposed model. Due fact that recurrences are usually caused by connection failure, this study is focused on reaction forces in supports representing the...
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Preparation of the porous biomaterial based on titanium alloy for orthopaedic implants
PublicationObecnie tytan i jego stopy (Ti-6Al-4V lub Ti-13Nb-13Zr) są szeroko stosowane jako biomateriały dla implantów ortopedycznych. Stale prowadzone są badania nad ich najlepszą odpornością na korozję i zużycie ścierne oraz biozgodnością i bioaktywnością. Obecne badania również skoncentrowane są na projektowaniu, wytwarzaniu i właściwościach materiałów porowatych na podstawie na przykład stopu tytanu (Ti-13Nb-13Zr), które mogą być stosowane...
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Investigations of pitting corrosion of magnesium by means of DEIS and acoustic emission
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Understanding chlorophylls: Central magnesium ion and phytyl as structural determinants
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Analysis of TL and OSL kinetics in lithium magnesium phosphate crystals
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On the distribution of aluminium and magnesium oxides in wustite catalysts for ammonia synthesis
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Preparation of Activated Carbon from the Biodegradable film for Co2 Capture Applications
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Biodegradable macromolecular conjugates of citropin: Synthesis, characterization and in vitro efficiency study
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Biodegradable Poly(ester-urethane) Carriers Exhibiting Controlled Release of Epirubicin
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Are Titania Photocatalysts and Titanium Implants Safe? Review on the Toxicity of Titanium Compounds
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Bis(dithiobenzoato-k2S,S')bis(tetrahydrofuran-kO)magnesium(II)
PublicationTytułowy związek [Mg(C7H5S2)2(C4H8O)2] został otrzymany w reakcji PhMgBr z nadmiarem CS2. Jest to pierwszy kompleks magnezu zawierający dwa ligandy ditiobenzoesanowe. Kompleks posiada zniekształconą geometrię oktaedryczną.
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Quasi-Static and Dynamic Testing of Carbon Fiber Reinforced Magnesium Composites
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Influence of zinc and magnesium carboxylates on properties of emulsions stabilized with acylglycerol emulsifiers.
PublicationOkreślono właściwości emulsji stabilizowanych emulgatorami acyloglicerolowymi modyfikowanymi karboksylanami cynku i magnezu. Zbadano wpływ kompozycji emulgatorów na HLB i efektywność w modelowych układach emulsyjnych.
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Response of inflammatory cells to biodegradable ultra-fine grained Mg-based composites
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