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Wyniki wyszukiwania dla: AROMATIC COMPOUNDS DEGRADATION
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Evolution of the nanostructure of Pt and Pt–Co polymer electrolyte membrane fuel cell electrocatalysts at successive degradation stages probed by X-ray photoemission
PublikacjaWe present a set of XPS (X-ray photoemission spectroscopy) measurements and detailed data-analysis of electrodes for polymer electrolyte membrane fuel cell (PEMFC) based on carbon supported catalysts (Pt and Pt–Co) subjected to a step-like potential cycling (accelerated degradation test). The results of the measurements complete and corroborate parallel TEM (transmission electron microscopy), XRD (X-ray diffraction) and XAS (X-ray...
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Simultaneous Determination of Indolic Compounds in Plant Extracts by Solid-Phase Extraction and High-Performance Liquid Chromatography with UV and Fluorescence Detection
PublikacjaA high-performance liquid chromatographic method with UV and fluorescence detection (HPLC-DAD-FLD) was developed for simultaneous determination of indolic compounds in plant material. Indole-3-carbinol (I3C), indole-3-acetic acid (I3AA), indole-3-acetonitrile (I3ACN), and 3,3′-diindolylmethane (DIM) were used as representative compounds that cover a wide spectrum of indole structures occurring in nature. For concentration and purification...
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Fast-response optoelectronic detection of explosives’ residues from the nitroaromatic compounds detonation: field studies approach
PublikacjaWe are presenting an application of optoelectronic nitrogen dioxide (NO2) analyzer based on cavity enhanced absorption spectroscopy in the detection of traces of explosives after detonation. It has been shown that the analyzer using blue-violet laser is able to detect explosive residues after the detonation of various amounts of nitroaromatic compounds (75g-1kg) with higher efficiency than the HPLC soil sample testing equipment,...
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Modeling hydrolysis of slowly biodegradable organic compounds in biological nutrient removal activated sludge systems
PublikacjaHydrolysis 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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Molecular basis and potential activity of HIV-1 reverse transcriptase toward trimethylamine-based compounds
PublikacjaReverse transcriptase (RT) inhibitors are currently used to treat human immunodeficiency virus (HIV)-1 infections. In this work, novel triethylamine derivatives were designed and studied by rigid and flexible docking and molecular dynamics (MD) approaches. An apo form of HIV-1 RT was also studied by MD simulation to analyze comparative response of protein in ligand-bound and ligand-unbound forms. Among newly designed HIV-1 RT inhibitors,...
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Intense and stable room-temperature photoluminescence from nanoporous vanadium oxide formed by in-ambient degradation of VI3 crystals
PublikacjaVanadium oxides have attracted research interest because their optoelectronic properties make them optically active with room-temperature photoluminescence (PL) emission, which, however, is not sufficiently intense for real applications. For this reason, many nanostructured vanadium oxides are currently fabricated through several precursors and different treatments to improve the PL efficiency and enhance the PL intensity. Herein,...
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Mechanistic insights into the reactive radicals-assisted degradation of sulfamethoxazole via calcium peroxide activation by manganese-incorporated iron oxide–graphene nanocomposite: Formation of radicals and degradation pathway
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Natural/bio-based sorbents as greener extractive materials for endocrine disrupting compounds in samples of different matrix composition
PublikacjaEndocrine-disrupting compounds (EDCs) are a group of chemicals that interfere with the endocrine system, leading to adverse effects on human health and the environment. Increasing concerns over the EDCs presence in various environmental compartments has driven the search for greener extraction materials. Recently, the use of polymers of natural origin (biopolymers) has been demonstrated to be an effective and promising research...
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Latest Insights on Novel Deep Eutectic Solvents (DES) for Sustainable Extraction of Phenolic Compounds from Natural Sources
PublikacjaPhenolic compounds have long been of great importance in the pharmaceutical, food, and cosmetic industries. Unfortunately, conventional extraction procedures have a high cost and are time consuming, and the solvents used can represent a safety risk for operators, consumers, and the environment. Deep eutectic solvents (DESs) are green alternatives for extraction processes, given their low or non-toxicity, biodegradability, and reusability....
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Seasonal changes in organotin compounds in water and sediment samples from the semi-closed Port of Gdynia
PublikacjaThe effect of seasonal changes on the distribution of organotin compounds (OTC) in the sediments and seawaterfrom the docks of the Port of Gdynia was investigated. Sediment and seawater samples were collectedfrom four industrial docks in February (winter) and June (summer) in 2009. The samples were analyzed forbutyltin, phenyltin, octyltin, and tricyclohexyltin (total of 9 OTC derivatives). The fine fraction (b0.063 mm)accumulated...
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Ag(e)ing and Degradation of Supercapacitors: Causes, Mechanisms, Models and Countermeasures
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Enzymatic degradation and transport of endothiopeptides into Escherichia coli K12 mutant strains
PublikacjaZbadano transport trzech otrzymanych na drodze syntezy ditiopeptydów do komórek Escherichia coli K12. Ponadto zbadano szybkość hydrolizy tych związków. Wszystkie peptydy są transportowane przez permeazy, natomiast są bardziej oporne na hydrolizę enzymatyczną w stosunku do naturalnych peptydów.
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Application of impedance imaging to evaluation of organic coating degradation at a local scale
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Degradation of Gel-Coat Layer in Glass/Polyester Laminate in Seawater Environment
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Hydrogen induced degradation of structural steel exposed to the technical liquid hydrocarbons
PublikacjaBadano degradacje stali 26H2MF w mieszaninach węglowodorów. Badania były prowadzone pod stałym obciążeniem i przy małej prędkości 10-6s-1
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Effective processes of phenol degradation on Fe3O4–TiO2 nanostructured magnetic photocatalyst
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Thermal degradation of butyl acrylate-methyl acrylate-acrylic acid-copolymers
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Assessment of reformer tubes degradation during longterm service at elevated temperatures
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Influence of inorganic fillers on the degradation of polypropylene membranes during membrane distillation
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Thermal degradation of poly(alkyl methacrylates) and polyurethane pressure-sensitive adhesives
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Microstructural aspects of hydrogen degradation of the 26H2MF and 34HNM constructional alloy steels
PublikacjaPodatność na degradację wywołaną przez wodór, dwóch gatunków polskich stali konstrukcyjnych stopowych: 26H2MF i 34HNM, określano przy pomocy próby powolnego rozciągania. Mierzono następujące parametry: energię pękania, wydłużenie, wytrzymałość na rozciąganie i przewężenie. Degradację stali obserwowano w 0,01M kwasie siarkowym przy gęstości prądu 20 mA/cm2 wraz z rodzajem przełomów. Poziom degradacji był zgodny z ilością wodoru...
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Influence of Boron Carbide on Core Degradation During Severe Accidents in LWRs
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The influence of implantation on mechanical degradation of the nanotubular oxide layer on titanium screws
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Neural Network Application for Recognition of Geometry Degradation of Power Cycle Components
PublikacjaPrzedyskutowano problem rozpoznawania degradacji geometrycznej. Skuteczne zastosowanie wybranego typu sieci neuronowej (SSN) jest prezentowane w referacie. SSN wykrywająca typy degradacji geometrycznej wykazała wysoką jakość. Pokazano pewną możliwość ekstrapolacji takich SSN. Pokazano możliwość wykrywania typów degradacji geometrycznej nawet w przypadku pozyskiwania niepełnych danych pomiarowych.
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The Role of Crypto Trading in the Economy, Renewable Energy Consumption and Ecological Degradation
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Current methods and technologies for degradation of atrazine in contaminated soil and water: A review
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Completing Autophagy: Formation and Degradation of the Autophagic Body and Metabolite Salvage in Plants
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Photodegradation of Benzo-[a]-pyrene on the Surface of the Photocatalytic Paints and Analysis of the Degradation Products
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Influence of sulphur on high temperature degradation of steel structures in the refinery industry
PublikacjaArtykuł stanowi przegląd skutków wpływu związków siarki, znajdujących się w mediach procesowych instalacji rafineryjnych, na elementy konstrukcji ze stali węglowych i stopowych. Wyróżniono dwa aspekty wysokotemperaturowej korozji siarkowej: związany z tworzeniem się zgorzeliny siarczkowej i ubytkami masy oraz dotyczący wewnętrznej degradacji elementu w wyniku zmian mikrostruktury stali. Przedstawiono tzw. zmodyfikowane krzywe McConomy...
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Indoor atmospheric degradation of historical metal objects studied by spectroscopic techniques
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Degradation of Gel-Coat Layer in Glass/Polyester Laminate in Seawater Environment
PublikacjaGlass/polyester laminate coated with gelcoat layer of different thickness 0,5; 1,5; 3 mm was studied in terms of blistering behaviour and water sorption in hot water environment. Blistering was found to be accelerated for thin (0,5 mm) gel-coat layer compared to the thick (1,5; 3 mm), however no significant difference in blistering behaviour was observed between the laminates with gel-coat thickness 1,5 and 3 mm which may suggest...
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Hydrogen-enhanced degradation and oxide effects in zirconium alloys for nuclear applications
PublikacjaThe zirconium alloys used in nuclear industry include mainly ZreSn and ZreNb alloys ofdifferent chemical composition, microstructure and susceptibility to both hydrogendegradation and oxidation. The hypothetic nuclear accidents can create a real danger tothe Zr alloys and stability of parts made of these alloys, and especially such as loss ofcoolant accident (LOCA) and reactivity initiated accidents (RIA). The hydrogen degradationcan...
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Impedance Spectroscopy as a Diagnostic Tool of Degradation of Solid Oxide Fuel Cells
Publikacjaw pracy przedstawiono wyniki badań degradacji tlenkowych ogniw paliwowych przeprowadzone metodą spektroskopii impedancyjnej. Ogniwa paliwowe zostały przetestowane w eksperymentalnych warunkach, które pozwalają na uzyskanie szybkiego spadku wydajności ogniw paliwowych. impedancja i parametry uzyskane z dopasowania widm do elektrycznego obwodu zastępczego zostały skorelowane z poziomem degradacji elementów ogniw paliwowych - anody...
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Aplication of impedance imaging to evaluation of organic coating degradation at a local scale
PublikacjaZaproponowano nowe podejście do oceny lokalnych właściwości elektrycznych powłok organicznych. Wykorzystuje ono mikroskop sił atomowych pracujący w trybie kontaktowym. Pomiędzy igłę mikroskopu i podłoże metalowe pokryte powłoką przykładany jest sinusoidalny napięciowy sygnał pobudzenia o zadanej częstotliwości i mierzony jest prądowy sygnał odpowiedzi. Zalety tego podejścia zostały zaprezentowane na przykładzie powłoki akrylowej...
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Degradation of protective coatings in steel chimneys of flue gas desulfurisation system
PublikacjaThis paper presents problems associated with corrosion of steel stacks and changes in philosophy of corrosion protection when implemented into flue gas desulphurization systems. In-situ tests were taken by means of electrochemical impedance spectroscopy at the stack which discharges flue gas before wet lime/limestone desulphurization. A very quick electrolyte absorption by the spherical infill vinylester coating was found using...
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Hydrogen induced degradation of structural steel exposed to the technical liquid hydrocarbons
PublikacjaSusceptibility of the differently heat treated 26H2MF steel to stress corrosion cracking has been evaluated in the constant strain rate tension tests done at the strain rate 10-6s-1 and in the constant load tests done at the 0,98 of fracture load. The boiler fuel and the aged mineral oil at 135C and 80C respectively, have been used as the aggressive environments.
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Influence of e-beam irradiation on the dynamic creep and fatigue properties of poly(aliphatic/aromatic-ester) copolymers for biomedical applications
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Thermophysical properties and phase equilibria study of the binary systems {N-hexylquinolinium bis(trifluoromethylsulfonyl)imide+aromatic hydrocarbons, or an alcohol}
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Interplay of hydrogen bonding and aromatic ring interactions in supramolecular complexes of phenazine with N,N'-bis(2-pyridyl)aryldiamines
PublikacjaOtrzymano pięć krystalicznych kompleksów fenazyny z N,N'-bis(2-pirydylo)arylodiaminami i N'N'-difenylo-1,4-diamino-benzenem o różnej stechiometrii. Badania struktur tych kompleksów za pomocą metod rentgenograficznych wykazały, że powiązane wiązaniami wodorowymi typu NH...N cząsteczki fenazyny i arylodiamin układają się w stosy, które stabilizowane są poprzez oddziaływaniami typu π-π płaszczyzna-krawędź pierścieni aromatycznych....
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Resveratrol enhances apoptosis induced by the heterocyclic aromatic amines in p53-wt LoVo cells, but not in p53-deficient HaCaT cells
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Berry fruit juices protect lymphocytes against DNA damage and ROS formation induced with heterocyclic aromatic amine PhIP
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The extended version of restriction analysis approach for the examination of the ability of low-molecular-weight compounds to modify DNA in a cell-free system
PublikacjaOne of the primary requirements in toxicology is the assessment of ability of chemicals to induce DNA covalent modification. There are several well-established methods used for this purpose such as 32P-Postlabeling or HPLC-MS. However, all of these approaches have difficult to overcome limitations, which prevents their use in genotoxin screening. Here, we describe the simple protocol exploiting specificity of restriction enzymes...
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Quantum dots conjugates with unsymmetrical bisacridines enhance cytotoxicity of these antitumor compounds in lung cancer cells and have protecting effects on normal cells
PublikacjaBackground: In recent years, with the rapid development of nanotechnology and its extensive applications in the medicine, nanocarriers for anticancer drug delivery have gained a great importance. Spherical semiconductor nanocrystals, frequently called quantum dots (QDs) are very attractive nanomaterials for bioimaging applications and they possess properties as potential candidates for drug carrier. Unsymmetrical bisacridines (UAs),...
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Fermi-liquid behavior of binary intermetallic compounds Y3 M (M = Co, Ni, Rh, Pd, Ir, Pt)
PublikacjaA series of polycrystalline samples of Y3 M (M = Co, Ni, Rh, Pd, Ir, Pt), intermetallic binary compounds were synthesized by the arc-melting method. Powder x-ray diffraction (pXRD) confirmed the orthorhombic cementite-type crystal structure and allowed for the estimation of the lattice parameters. Physical properties were investigated by means of electrical resistivity and heat capacity measurements between 1.9 K and 300 K. All...
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Combination of terrestrial laser scanning and UAV photogrammetry for 3D modelling and degradation assessment of heritage building based on a lighting analysis: case study—St. Adalbert Church in Gdansk, Poland
PublikacjaThe construction of the St. Adalbert Church in Gdansk dates to 1310. It is a church of rich history and great historical value, and its care is challenging. In this study, the combination of unmanned aerial vehicle (UAV) photogrammetry and terrestrial laser scanning (TLS) was used to accurately build a 3D model of the church. Together with the collected historical inventory documentation, the historic building information model...
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New Phenolic Compounds from the Roots of Lentil (Lens culinaris)
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Chiral phonons in the honeycomb sublattice of layered CoSn-like compounds
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Environmental fate of endocrine disrupting compounds - analytical problems and challenges
PublikacjaNarażenie na substancje wykazujące się aktywnością hormonów płciowych może negatywnie wpływać na układ endokrynny i rozrodczy u ludzi i innych organizmów żywych. Badania wykazały że obserwowane są znaczne wzrosty przypadków występowania nowotworów piersi, prostaty i jąder. Inne zaś wykazały obniżoną liczbę plemników w nasieniu mężczyzn i wydłużenie czasu oczekiwania na poczęcie. Odkrycia te znajdują potwierdzenie w badaniach polowych...
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Quantitative structure-(chromatographic) retention relationship models for dissociating compounds
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Sorption Properties of Polydivinylbenzene Polymers towards Phenolic Compounds and Pharmaceuticals
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