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Wyniki wyszukiwania dla: chemia peptydów
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Polylactide-Based Films with the Addition of Poly(ethylene glycol) and Extract of Propolis—Physico-Chemical and Storage Properties
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Effect of the Concentration of Hop Cone Extract on the Antibacterial, Physico-Chemical and Functional Properties of Adhesive Toilet Cleaners
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Chemical hazard in glacial melt? The glacial system as a secondary source of POPs (in the Northern Hemisphere). A systematic review
PublikacjaToxicity of compounds belonging to persistent organic pollutants (POPs) iswidely known, and their re-emission from glaciers has been conclusively demonstrated. However, the harmful effects associated with such secondary emissions have yet to be thoroughly understood, especially in the spatial and temporal context, as the existing literature has a clear sampling biaswith the best recognition of sites in the European Alps. In this...
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Modeling and optimization of chemical-treated torrefaction of wheat straw to improve energy density by response surface methodology
PublikacjaToday, torrefaction is important technique for extending the potential of biomass for improvement of energy density. The independent variables investigated for torrefaction study were temperature, retention time, acid concentration, and particle size. The experiment was designed by central composite design (CCD) method using design expert (version 11). The three dependent variables were higher heating value (HHV), energy enhancement...
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Currently Commercially Available Chemical Sensors Employed for Detection of Volatile Organic Compounds in Outdoor and Indoor Air
PublikacjaThe paper presents principle of operation and design of the most popular chemical sensors for measurement of volatile organic compounds (VOCs) in outdoor and indoor air. It describes the sensors for evaluation of explosion risk including pellistors and IR-absorption sensors as well as the sensors for detection of toxic compounds such as electrochemical (amperometric), photoionization and semiconductor with solid electrolyte ones....
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Peptide conjugates of lactoferricin analogues and antimicrobials—Design, chemical synthesis, evaluation of antimicrobial activity and mammalian cytotoxicity
PublikacjaEight new peptide conjugates composed of modified bovine lactoferricin truncated analogues (LFcinB) and oneof the three antimicrobials — ciprofloxacin (CIP), levofloxacin (LVX), and fluconazole (FLC) — were synthesized. Four different linkers were applied to connect a peptide and an antimicrobial agent. The FLC-containing peptidic conjugates were synthesized using the “click chemistry” method. This novel approach is reported here...
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Amperometric sensing of chemical oxygen demand at glassy carbon and silicon electrodes modified with boron-doped diamond
Publikacja.A boron-doped diamond (BDD) sensor is proposed for effective detection of chemical oxygen demand (COD) by means of amperometric technique. Boron-doped diamond thin films, acting as active sensors, were deposited on both silicon wafer and glassy carbon (GC) substrates by microwave plasma assisted chemical vapour deposition. SEM micrographs showed that BDD–Si displays triangle-faceted crystallites ca. 0.5–3 μm in size, while BDD–GC...
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Analysis of chemical composition and hardness of copper alloys = Badania składu chemicznego oraz twardości stopów miedzi
PublikacjaWykonano analizę składu chemicznego oraz badania twardości stopów miedzi zastosowanych na elementy łożyskowe. Sformułowano wnioski.
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Electroactive polymer/graphene oxide nanostructured composites; evidence for direct chemical interactions between PEDOT and GOx
PublikacjaThis work concerns electrochemical synthesis of nanocomposites consisting of conducting polymer and reduced graphene oxide (rGOx) as electrode materials for supercapacitors. The electrosynthesis was performed in an aqueous solution of the 3,4-ethylenedioxytiophene (EDOT) monomer and graphene oxide (GOx) without supporting electrolyte. The amount of GOx was optimized to obtain the best electrochemical performance of the nanocomposite...
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Chemical composition of shells from red (Strongylocentrotus franciscanum) and green (Strongylocentrotus droeba-chiensis) sea urchin
PublikacjaThe shells from red and green sea urchins accounted for 47.9 and 40.7% of their body weights, respectively. The red and green sea urchin shells contained 91.08 and 90.77% minerals and 4.06 and 4.99% proteins, respectively. The shells did not contain any chitin. Sea urchin shells had a relatively large amount of naphthoquinone pigments, 121 mg per 100 g in red and 163 mg per 100 g in green species. The small quantities of glucosamine...
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Determination of Chemical Oxygen Demand (COD) at Boron-doped Diamond (BDD) Sensor by Means of Amperometric Technique
PublikacjaA boron-doped diamond (BDD) sensor was proposed for effective detection of chemical oxygen demand (COD) by means of amperometric technique. Thin boron doped diamond active sensor layer was deposited on Si wafer and glassy carbon substrate by Microwave Plasma Enhanced Chemical Vapor Deposition (MW PE CVD). The structure of BDD was confirmed by Raman spectra analysis. Broad Raman bands centered at 482 cm-1 and 1219 cm-1 are typical...
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Optimization of Chemical Functionalities of Indole-2-carboxamides To Improve Allosteric Parameters for the Cannabinoid Receptor 1 (CB1)
Publikacja5-Chloro-3-ethyl-N-(4-(piperidin-1-yl)phenethyl)-1H-indole-2-carboxamide (1; ORG27569) is a prototypical allosteric modulator for the cannabinoid type 1 receptor (CB1). Here, we reveal key structural requirements of indole-2-carboxamides for allosteric modulation of CB1: a critical chain length at the C3-position, an electron withdrawing group at the C5-position, the length of the linker between the amide bond and the phenyl ring...
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Removal of indicator bacteria from treated wastewater using physical and chemical methods. Pilot plant study.
PublikacjaEven after highly efficient biological processes the effluents from wastewater treatment plants may contain significant number of fecal bacteria, from 104 to 106 CFU/100 mL. Since no standards are set on the bacteriological quality of treated wastewater in Poland the elimination of bacterial contaminants is not a priority in wastewater treatment policy. Thus microbiological hazards become particularly significant in the situation...
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Application of dispersive liquid - liquid microextraction for determination of pesticides from various chemical groups in water samples
PublikacjaPesticides are a global risk because they move with the wind, rain and sea currents from other regions, which makes getting to places which were never used before. Their presence was detected in all types of water circulating in the ecosystem, which is an easy source of exposure to life and health of all living organisms. Currently, it is considered one of the most dangerous and toxic pollutants, which fate and function is still...
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Determination of chemical oxygen demand (cod) at boron-doped diamond (bdd) sensor by means of amperometric technique
PublikacjaA boron-doped diamond (BDD) sensor was proposed for effective detection of chemical oxygen demand (COD) by means of amperometric technique. Thin boron doped diamond active sensor layer was deposited on Si wafer and glassy carbon substrate by Microwave Plasma Enhanced Chemical Vapor Deposition (MW PE CVD). The structure of BDD was confirmed by Raman spectra analysis. Broad Raman bands centered at 482 cm-1 and 1219 cm-1 are typical...
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Synthesis, Chemical Characterization and Multiscale Biological Evaluation of a dimericcRGD Peptide for Targeted Imaging of αVβ3 Integrin Activity
PublikacjaCyclic peptides containing the Arg-Gly-Asp (RGD) sequence have been shown to specifically bind the angiogenesis biomarker α V β3 integrin. We report the synthesis, chemical characterization, and biological evaluation of two novel dimeric cyclic RGD-based molecular probes for the targeted imaging of α V β3 activity (a radiolabeled version, 64Cu-NOTA-PEG4-cRGD2, for PET imaging, and a fluorescent version, FITC-PEG4-cRGD2, for in...
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The changes of crosslink density of polyurethanes synthesised with using recycled component. Chemical structure and mechanical properties investigations.
PublikacjaThis paper aims at the utilisation of glycerolysate (Gly) obtained in polyurethane recycling process by means of crude glycerine, which has in its structure hydroxyl end groups that allow for further processing. Polyurethanes (PUs) were synthesised using prepolymer method with the mixture of neat polyol and glycerolysate, in different ratios, with 4,4-diphenylmethane diisocyanate (MDI). The prepolymer was subsequently extended...
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Chemical characterization of wild populations of Brassica oleracea complex species (n=9) for the content of their bioactive compounds
PublikacjaThe wild species belonging to Brassica oleracea complex species (n=9) are widespread in the Mediterranean basin and represent the relative species of several vegetable crops, such as broccoli, cauliflower, kale, cabbage. They are characterized by the high level of bioactive compounds, such as glucosinolates (GLSs), known for their benefits for human health. Four accessions were evaluated: B. macrocarpa (BM) from Favignana (Trapani),...
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Toenail selenium level among healthy residents of two polish districts
PublikacjaCelem pracy było badanie zawartości selenu w próbkach paznokci pobranych od mieszkańców Województwa Pomorskiego i Lubuskiego. Wykazano, że średnie stężenia Se w próbkach paznokci wynosiło odpowiednio 0,57 ± 0,10, 0,60 ± 0,16 mg kg-1. Stwierdzono także, że płeć, wiek, wskaźnik masy ciała, status palenia oraz przyjmowanie Se w postaci suplementów diety przez uczestników badania wpływa istotnie statystycznie na poziom...
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Zintegrowany system badań zanieczyszczenia środowiska oparty na wykorzystaniu analityki chemicznej i biotestów = Integrated system for assessment of environment quality based on chemical analysis and biotests/Integrated system for assessment of environment quality based on chemical analysis and biotests/
PublikacjaW ostatnich latach coraz częściej do oceny jakości środowiska wykorzystuje się tzw. narzędzia zintegrowane, czyli połączenie analiz chemicznych z mikrobiotestami. Umożliwić to ma identyfikację potencjalnych źródeł toksyczności w analizowanych próbkach. Niestety, znalezienie wyraźnych korelacji pomiędzy wynikami analiz chemicznych oraz oszacowanymi parametrami toksyczności nie jest prostym zadaniem i nastręcza wiele trudności.
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Cyanobacterial toxins in fresh and brackish waters of Pomorskie Province (Northern Poland)
PublikacjaPraca dotyczy oznaczania toksyn należących do grupy hepatotoksycznych peptydów cyklicznych oraz neurotoksycznych alkaloidów. Są one odpowiedzialne za uszkodzenia ryb i ptaków, które powstają w wyniku zakwitu glonów. Badano zakwity w wodach słodkich Pomorza. Oznaczano hepatoksyny, mikrocysty oraz nodularynę. Opracowano w tym celu warunki analityczne przy zastosowaniu techniki HPLC-DAD. Do identyfikacji anatoksyny-A użyto techniki...
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CHEMICAL ENGINEERING & TECHNOLOGY
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COMPUTERS & CHEMICAL ENGINEERING
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CHEMICAL ENGINEERING COMMUNICATIONS
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CHEMICAL SOCIETY REVIEWS
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ACCOUNTS OF CHEMICAL RESEARCH
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JOURNAL OF CHEMICAL SCIENCES
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RUSSIAN CHEMICAL REVIEWS
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Hanna Staroszczyk dr hab. inż.
OsobyAbsolwentka Wydziału Inżynierii i Technologii Chemicznej Politechniki Krakowskiej, od 2007 roku pracuje w Katedrze Chemii, Technologii i Biotechnologii Żywności Wydziału Chemicznego Politechniki Gdańskiej. Pracowała w Politechnice Krakowskiej, Akademii Rolniczej w Krakowie, Institute of Food Research w Norwich, Academia Sinica w Tajpej oraz University of Arkansas w Fayetteville. W 2013 roku uzyskała stopień doktora habilitowanego...
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Au nanoparticles identifiction with the use of AFM Volta potential mapping
Dane BadawczeThe specific physical, chemical and electrochemical electrical properties of gold nanoparticles have led to their extensive use as high-performance chemical and biochemical sensors. The described properties relate to surface plasmon resonance, fluorescence quenching or enhancement, high electrical conductivity and light scattering. The described nanoparticles...
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Andrzej Wasik prof. dr hab. inż.
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Chemia Budow. (niestac. II sem) 21/22
Kursy OnlineMateriały do wykładu z przedmiotu Chemia dla studentów kierunku Budownictwo (studia I stopnia) semestru II (semestr letni). Tematyka kursu obejmuje podstawowe zagadnienia z chemii ogólnej, jak również specjalistyczne zagadnienia z zakresu chemii budowlanej, w tym: - podstawy chemii kwantowej, - reakcje chemiczne (stechiometria, podstawy termodynamiki i kinetyki reakcji), - fizykochemia wody, - roztwory wodne (stężenia,...
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Analysis of the grain boundary conductivity for nanocrystalline doped ceria using the brick layer model.
PublikacjaW pracy przedstawiono wyniki badań elektrycznych i mikrostrukturalnych ceru domieszkowanego itrem. Gęste i nanokrystaliczne filmy przygotowane zostały z użyciem prekursorów polimerowych na szafirze. Konduktancja elektryczna była badana w funkcji temperatury syntezy, która jest skorelowana z wielkością ziaren. Otrzymano mniejszą konduktancję nanokrystalicznego filmu ceru w porównaniu z próbkami ceramicznymi.
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Electrical conductivity of nanostructured acceptor-doped ceria fabricated by spark plasma sintering (SPS)
PublikacjaHigh purity nanoscale powders (~10–15 nm size) of two different compositions of ceria, doped with Gd3+ and Ca2+, have been consolidated by spark plasma sintering (SPS) at different temperatures. Fully-dense samples were observed only at a sintering temperature of 980 °C. The as-sintered samples showed rather fast grain growth with an average grain size below 300 nm. The electrical properties of the samples were evaluated by impedance...
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Copper and cobalt co-doped ceria as an anode catalyst for DIR-SOFCs fueled by biogas
PublikacjaThe nanocrystalline compounds of Co and Cu co-doped ceria (with up to 20 mol.% of dopants) were fabricated by the reverse microemulsion synthesis method. They were deposited in a form of layers on the surface of SOFC anode in an aim to act as electrochemically active materials for biogas reforming process. Fourier Transformed Infrared Spectroscopy was used to analyze a composition of outlet gases simultaneously with the tests of...
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Structural and catalytic properties of ceria layers doped with transition metals for SOFCs fueled by biogas
PublikacjaThe aim of this paper was to investigate an influence of the nanocrystalline Ce0.8A0.2O2-δ (A = Mn, Fe, Co, Ni, Cu) materials on the direct internal reforming of biogas in SOFC. Structural analysis of fabricated compounds has been done. An in-situ analysis of a composition of outlet gases from operating SOFC was performed using FTIR spectroscopy with simultaneous electrical tests. It was found out, that type of dopant strongly...
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Morphological, genetic, chemical and ecophysiological characterisation of two Microcystis aeruginosa isolates from the Vistula Lagoon, southern Baltic
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Recent achievements in chemical hydride generation inductively coupled and microwave induced plasmas with optical emission spectrometry detection
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Quantum chemical modeling (DFT) of active species on the VWO catalyst surface in various redox conditions
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Glycerol extracts of Glycyrrhiza glabra, Echinacea purpurea, Silybum marianum and Berberis vulgaris: chemical characterisation and cosmeceutical potential
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Comparison of antioxidant and enzyme inhibition activities as well chemical composition of different extracts and fractions of Rubus caesius leaves
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Investigation on structural, optical and anti-bacterial properties of organic additives iron oxide prepared by chemical route method
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Mobility and bioavailability of mercury in sediments of the southern Baltic sea in relation to the chemical fractions of iron: Spatial and temporal patterns
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Definicje schematów danych jako specjalizowane dialekty językowe na przykładzie XML Schema dla sektora energetycznego
PublikacjaRozdział przedstawia zagadnienie opracowania zbioru reguł (schematu) dla dokumentów XML i omawia celowość tworzenia takich schematów na przykładzie XML Schema dla sieci elektroenergetycznej.
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Estimation of Potential Leakage from Dumped Chemical Munitions in the Baltic Sea Based on Two Different Modelling Approaches
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Chemical composition and antifungal activity of Chelidonium majus extracts – antagonistic action of chelerythrine and sanguinarine against Botrytis cinerea
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Poly(3,4-ethynenedioxythiophene)-Prussian Blue hybrid material evidence of direct chemical interaction betwenn PB andpEDOT
PublikacjaPrzedstawiono syntezę materiału złożonego z poli(3,4-etylenodioksytiofenu) oraz analogu błękitu pruskiego. Sieć struktury BP utworzona została wewnątrz matrycy polimerowej pEDOT-u za pomocą metody polaryzacji multicyklicznej. Chemiczne oddziaływania Fe z BP oraz siarki z pEDOT zostały potwierdzone metodą XPS. Obecność BP potwierdzono FTiR - stwierdzono obecność drgań rozciągających Fe-C oraz Fe-N. Metoda cyklowoltamperometryczna...
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Sample handling and determination of physico-chemical parameters in rime, hoarfrost, dew, fog and cloud water samples - a review
PublikacjaW pracy przedstawiono różne typy próbników stosowanych do pobierania próbek osadów atmosferycznych (szron, szadź, rosa, mgła i woda z chmur). Zaprezentowano urządzenia o różnym stopniu automatyzacji. W pracy przedstawiono również informacje literaturowe na temat oznaczania parametrów fizyko-chemicznych w próbkach osadów atmosferycznych z zastosowaniem odpowiednich technik pomiarowych.
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Physico‐chemical and proteolytic changes during cold storage of dry‐cured pork loins with probiotic strains ofLAB
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Chemical Composition and Antimicrobial Activity of Selected Essential Oils against Staphylococcus spp. Isolated from Human Semen
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