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Search results for: meldrum's acid
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Isolation and characterization of Acid Soluble Collagen from the Skin of African Catfish (Clarias gariepinus), Salmon (Salmo salar) and Baltic cod (Gadus morhua)
PublicationAcid-soluble collagen (ASC) from the fish skin of African catfish (Clarias gariepinus), Salmon (Salmo salar) and Baltic cod (Gadus morhua) was extracted and characterized. The ASC extraction yield was 75%, 73% and 68%, respectively. The denaturation and melting temperatures of African catfish ASC (29.3°C and 100.0°C) were significantly higher than ASC of Salmon and Baltic cod (20.6°C and 90.5°C; 15.2°C and 86.7°C, respectively), assessed...
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Performance tuning of chitosan-based membranes by protonated 2-Pyrrolidone-5-carboxylic acid-sulfolane DES for effective water/ethanol separation by pervaporation
PublicationToday, the applicability of deep eutectic solvents (DES) in various fields, including membrane science and technology, is extensively investigated. In pioneering works, we have implemented different DES as a component of chitosan (CS)-based flat membranes for pervaporation (PV) separation. Herein, we present a new protonated (by sulphuric acid) 2-Pyrrolidone-5-carboxylic acid: sulfolane DES, as a green additive for its chemical...
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The influence of amorphous macrodiol, diisocyanate type and l-ascorbic acid modifier on chemical structure, morphology and degradation behavior of polyurethanes for tissue scaffolds fabrication
PublicationStudies described in this work were related to the bulk synthesis and characterization of polyurethanes (PURs) obtained with the use of cyclic 4,4′-methylene bis(cyclohexyl isocyanate) (HMDI) or linear 1,6-hexamethylene diisocyanate (HDI), amorphous α,ω-dihydroxy(ethylene-butylene adipate) macrodiol (PEBA), 1,4-butandiol (BDO) chain extender and dibutyltin dilaurate (DBTDL) catalyst. Obtained PURs were modified with l-ascorbic...
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Synthesis of eosin modified TiO2 film with co-exposed {001} and {101} facets for photocatalytic degradation of para-aminobenzoic acid and solar H2 production
PublicationOwing to the increasing photosensitivity and DNA damage properties of para-aminobenzoic acid (PABA), concerns have been raised over the exposure of humans to PABA. Solar light-driven photocatalysis (SPC) provides a promising solution for the effective removal of organic pollutants especially when directed towards sulfate radical (SO4−) production. Herein, we have developed a sulfite-enhanced SPC using Eosin-Y sensitized TiO2/Ti...
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A study of chirality in bis(1,2-dimethoxyethane-κ^2 O,O')sodium bis(tri-tert-butoxysilanethiolato-κ2O,S)sodate
PublicationPraca prezentuje analizę samoorganizacji związku kompleksowego z prostszych jonów na przykładzie silanotiolanosodanu bis(dimetoksyetan)sodu. Stwierdzono, że w anionie (RS)2Na- obie grupy tri-tert-butoksysilanotiolanowe mają tę samą skręcalność - obie (P) lub obie (M). Zjawisko to występuje we wszystkich znanych sodanach i litanach zawierających grupę (tert-BuO)3SiS.
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Di-{bis(tri-tert-butoxysilanethiolato-S)(dimethylformamide-O)cadmium(II)}-μ-trans-1,2-di-4-pyridylethene-κ2N:N'
PublicationW przypadku tytułowego związku di-{bis(tri-tert-butoksysilanotiolano-S)(dimetylformamid-O)kadm(II)}-μ-trans-1,2-di-4-pirydyloeten [Cd(C12H27O3SSi)4(C3H7NO)2(C12H10N2)], centralny atom kadmu jest skoordynowany z czterema atomami donorowymi, tworząc rdzeń typu CdNOS2. Jest to pierwszy kompleks Cd(II) o tego typu centrum i ze względu na obecność dwóch reszt tiolanowych, N- i O-donora może on służyć za model centrum katalitycznego...
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Electromagnetic wave scattering in structures containing cylindrical object.**2005, 177 s. 119 rys. 8 tab. bibliogr. 239 poz.
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Synthesis and properties of azobenzocrown ethers with pi-electron donor, or pi-electron donor and pi-electron acceptor group(s) on benzene rings
PublicationZsyntezowano nowe etery azobenzokoronowe o różnej wielkości makropierścienia i z różnymi podstawnikami w resztach benzenowych. Korony te posiadają w pierścieniach benzenowych, w pozycji para do grupy azo grupy funkcyjne o charakterze π-elektronodonorowym lub π-elektronoakceptorowym. Zbadano zdolność kompleksowania jonów metali przez te korony, w roztworze, metodą spektrofotometrii UV-vis. Ustalono strukturę 19-członowego eteru...
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Impedancja nerki. Biul. Oddz. Białost. SEP**2003 nr 16 s. 22-25, 4 rys. bibliogr. 3 poz.
PublicationPrzedstawiono istotę odwzorowania pracy nerki za pomocą obwodu elektrycc- nego. Podano zmiany przepływu krwi w przypadku zmian chorobowych w nerce.
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Związki kompleksowe o rdzeniu bogatym w siarkę zawierające dwa różne ligandy S-donorowe - potencjalne prekursory siarczków metali
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Selectivity of Mixed Iron-Cobalt Spinels Deposited on a N,S-Doped Mesoporous Carbon Support in the Oxygen Reduction Reaction in Alkaline Media
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A Review of the Monograph by Yu. Bilan, O. Chygryn, S. Kolosok “Environmental and Economic Impacts of Energy Transformation: Concepts Innovation and Business Models”
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Synthesis, anticandidal activity of N3-(4-methoxyfumaroyl)-(S)-2,3-diaminopropanoic amide derivatives – Novel inhibitors of glucosamine-6-phosphate synthase
PublicationNovel FMDP amiders 4-6 have been synthesized and tested against Candida strains. The anticandidal activity has been confined only to Candida albicans. Anticandidal activity of the tested amides has correlated with their inhibitory activity of glucosamine-6-phosphate synthase in cell free extract from Candida albicans.
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Treatment of bitumen post oxidative effluents by sulfate radicals based advanced oxidation processes (S-AOPs) under alkaline pH conditions
PublicationSulfate radicals based Advanced Oxidation Processes (S-AOPs), namely Persulfate and peroxymonosulfate, were used for the treatment of post oxidative effluents from a production of petroleum bitumens under alkaline pH. Studies on the identification and monitoring of the volatile organic compounds (VOCs) along with COD, BOD and sulfide ions reduction were performed. Persulfate with a ratio between the oxygen from the oxidant and...
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The effect of alkyl chain length on synergistic effects in micellization and surface tension reduction in nonionic gemini (S-10) and anionic surfactants mixtures
PublicationMixtures of nonionic gemini surfactant S-10 ( α, α'-[2,4,7,9-tetrametyl-5-decyne-4,7-diyl]bis[ω-hydroxy -polioxyetylene] with anionic SRS (sodium alkylsulfates) and SRSO3 (sodium alkylsulfonates) of different alkyl chain length (from 10 to 14 carbon atoms) were investigated. Surface tension measurements were used to find the cmc values and other adsorption parameters. The Clint, Rubingh’s and Rosen theories were applied for evaluation...
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Siatkoblaszek maczugowaty Gomphus clavatus (Pers.: Fr.) S. F. Gray - nowy gatunek grzyba w rejonie Wejherowa (Pomorze Gdańskie)
Publication1 sierpnia 2009 r. autorzy stwierdzili trzecie niżowe stanowisko bardzo rzadkiego, kalcyfilnego (wapieniolubnego) gatunku grzyba, jakim jest siatkoblaszek maczugowaty Gomphus clavatus. Jest ono położone w południowej części Puszczy Darżlubskiej, w pobliżu Wejherowa. W literaturze grzyb wymieniano jako gatunek górski, podawany był z Gór Świętokrzyskich, Beskidu Niskiego i Sądeckiego, Bieszczadów, Gorców i Tatr. Na niżu dotąd odnotowano...
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Structure and properties comparison of poly(ether-urethane)s based on nonpetrochemical and petrochemical polyols obtained by solvent free two-step method
PublicationThe application of thermoplastic polyurethanes (TPU) is becoming more and more extensive, and the decreasing of used petrochemical monomers and reduction of energy for the polymerization and processing processes is getting increasingly important. In this paper, we confirmed the positive influence of high bio-based monomers contents (by replacing petrochemical polyol and glycol by bio-based counterparts) on processing and properties...
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Influence of chemical structure on physicochemical properties and thermal decomposition of the fully bio-based poly(propylene succinate-co-butylene succinate)s
PublicationIn this work, two polyesters and four copolyesters were studied. All materials were synthesized to obtain the monomers dedicated for thermoplastic polyurethane elastomers. For this type of PUR, the monomers should characterize by appropriate selected physicochemical properties and macromolecular structure distribution, which depends on synthesis conditions. The study of chemical structure with extensive and knowledgeable analysis...
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Determination of amino acids in urine of patients with prostate cancer and benign prostate growth
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Utilization of oriented crystal growth for screening of aromatic carboxylic acids cocrystallization with urea
PublicationThe possibility of molecular complex formation in the solid state of urea with benzoic acid analogues was measured directly on the crystallite films deposited on the glass surface using powder X-ray diffractometry (PXRD). Obtained solid mixtures were also analyzed using Fourier transform infrared spectroscopy (FTIR). The simple droplet evaporation method was found to be efficient, robust, fast and cost-preserving approach for first...
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Separation of fatty acids, their methyl esters and triacylglycerols by non-aqueous electrochromatography and HPLC.
PublicationElektrochromatografię kapilarną (CEC) oraz HPLC w odwróconym układzie faz zastosowano do rozdzielenia wolnych kwasów tłuszczowych, ich estrów metylowych oraz triacylogliceroli TAG. Zaproponowano własną konstrukcję zestawu laboratoryjnego do CEC oraz sposób preparowania mikrokolumn o średnicy 100 mm i długości złoża (Hypersil ODS 3 mm) 200 mm. Z porównania względnych czasów retencji TAG rozdzielanych technikami CEC i HPLC przy użyciu...
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Long chain polyunsaturated fatty acids in smoked Atlantic mackerel and Baltic sprats
PublicationWyniki pracy wykazały, że zmienność w składzie kwasów tłuszczowych w surowcu, (makrela, szprot), pochodzącym z różnych dostaw, była większa niż zmiany wywołane wędzeniem i przechowywaniem wędzonego produktu.
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Determination of Selected Organic Acids in Animal Farm Water Samples by Ion Chromatography
PublicationLow molecular mass carboxylic acids (LCAs) occur in many environmental compartments due to natural processes and human activity. They are an important group of organic pollutants of waste water that mainly includes, volatile fatty acids, and also dicarboxylic, aromatic, hydroxy- and ketoacids. LCAs are present in the environment at concentrations between 1 to 5000 ppm and different methods have been reported for their determination...
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Determination of short-chain monocarboksylic acids in cattle farm and dairy industry wastewater
PublicationThe paper describes application of various techniques to determine short-chain monocarboksylic acids (SCMAs) in samples from the successive steps from milk production: from wastewater from cattle farm to wastewater from dairy industry. Each technique of sample preparation is followed by gas chromatographic analysis.
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Hydration of Simple Carboxylic Acids from Infrared Spectra of HDOand Theoretical Calculations
PublicationBadanie hydratacji kwasów karboksylowych w rozcieńczonych roztworach wodnych ma duże znaczenie dla zrozumienia ich funkcji biologicznych. Metodą stosowaną w badaniach była spektroskopia oscylacyjna FTIR z zastosowaniem techniki rozcieńczenia izotopowego wody półciężkiej HDO w roztworze wody zwykłej. Do analizy danych widmowych wykorzystano ''metodę widm różnicowych''. Widma HDO zaburzonej przez kwasy: mrówkowy, octowy i propionowy...
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Generation of chirality in 4,4'-azopyridine by co-crystallization with optically active dicarboxylic acids
PublicationOtrzymano kokryształy anti-4,4'-azopirydyny z optycznie czynnymi kwasai: 9,10-dihydro-9,10-etanoantraceno-11,12-dikarboksylowym i trans-1,2-cykloheksnodikarboksylowym. Następnie pomierzono dichroizm kołowy otrzymanych kryształów. Dodatni znak efektu Cottona, odpowiadający niskoenergetycznemu wzbudzeniu elektronowemu n-pi*, został skorelowany z M helikalnością skręconego chromoforu Ar-N=N. Absolutna konfiguracja skręconej cząsteczki...
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X-ray Photoelectron Spectroscopy of Carboxylic Acids as Corrosion Inhibitors of Aluminium Alloys
PublicationThe datasets, titled X-ray Photoelectron Spectroscopy studies of citric acid adsorption on aluminium alloy 5754 in alkaline media and X-ray Photoelectron Spectroscopy studies of various carboxylic acids adsorption on aluminium alloys in alkaline media, contain XPS studies of the corrosion inhibitory action of selected dicarboxylic acids towards commercially available aluminium alloy 5754 in alkaline media at pH=11. These datasets...
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Influence of the internet and electronic commerce growth on polish small and medium enterprises. PODAĆ POLSKI TYTUŁ.
PublicationTechnological development in communication creates new possibilities for commercial activity . Each new medium was changing business processes . Internet does the same - implies rapid changes in every stage of commercial activity.The aim of this paper is to show that the Internet and Electronic Commerce are influencing the Small and Medium Enterprises (SMEs) development in Poland. For achieving this another issue had to be under...
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Impact of Integrated European Business Environment on Small and Medium-sized Enterprises (SMEs) Cooperation Strategies
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3-phase medium frequency transformer for a 100kW 1.2kV 20kHz Dual Active Bridge converter
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25 kV–50 Hz railway supply modelling for medium frequencies (0–5 kHz)
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Softly switched model predictive control for control of integratedwastewater treatment system at medium time scale.
PublicationW przypadku gdy system jest sterowany za pomocą jednej, uniwersalnej strategii sterowania w pełnym zakresie jego obciążeń, powstają poważne trudności w znalezieniu optymalnego sterowania. W celu jak najlepszego dopasowania strategii sterowania do panujący warunków, zdefiniowano trzy stany operacyjne: normalny, zakłóceniowy oraz awaryjny. Dla tych stanów zaprojektowano odpowiednie strategie sterowania. W związku z tym pojawia się...
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The dying medium temperature impact on the final moisture content of pine wood at constant drying time
PublicationThe results of final moisture content of pine wood (Pinus sylvestris L.) after drying process are presented. The wood in the experiments was taken from the northern part of Pomeranian region in Poland. The drying process was performed in the experimental chamber equipped with the micro-jet heat exchanger. The air at temperatures of 40°C, 60°C, 80°C, 100°C and 120°C with relative humidity about 60% and atmospheric pressure was the...
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Corporate social responsibility in reference to environmental statements within EMAS system in small and medium enterprises
PublicationAccording to the corporate social responsibility concept, organisations should apply any mechanisms available supporting their business actions contributing i.e. to the improvement of natural environment. Among them is EMAS eco-management and audit scheme. The prove of its implementation is environmental statement and entering the organisation into a national EMAS register. The aim of the statement is informing the society and...
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Lean Six Sigma in French and Polish Small and Medium-Sized Enterprises - The Pilot Research Results
PublicationThe article presents results of the research conducted in Polish and French small and medium-sized enterprises referring to the context of the implementation and application of the concept of Lean Six Sigma. The research was conducted in the form of case studies, observations and individual interviews. The pilot studies led to the identification of the needs, expectations, concerns and experiences of these companies. At the same...
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Influence of laser processing of the low alloy medium carbon structural steel on the development of the fatigue crack
PublicationThe paper contains the results of the structural analysis, hardness tests and fatigue tests conducted for the medium carbon structural steel with low content of Cr and Ni after its processing with CO2 laser beam. Pre-cracks were made in the round compact tension (RCT) specimen used for fatigue test. Next, four paths, parallel to each other, were melted on both sides of the samples using a laser beam. The paths were perpendicular...
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Modified Preisach model of hysteresis in multi air gap ferrite core medium frequency transformer
PublicationThis article presents the modified Preisach model of hysteresis for a 3-phase medium frequency transformer in a 100 kW dual active bridge converter. The transformer magnetic core is assembled out of ferrite I-cores, which results in multiple parasitic air gaps. For this transformer, the hysteresis loops were measured and parameters of the Preisach model were determined. The Preisach distribution function is approximated with a...
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Knowledge Management Approaches of Small and Medium-Sized KIBS Firms: a Descriptive Analysis of Four Countries
PublicationPurpose –There is evidence that small and medium sized enterprises (SMEs) do not manage knowledge the same way as large firms, and that they approach knowledge management (KM) in various ways. However, the literature on this topic is still scarce and fragmented. In order to fill this gap, the paper aims to single out and discuss the different features that characterize the approaches to KM adopted by small companies. Design/methodology/approach...
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3-phase medium frequency transformer for a 100kW 1.2kV 20kHz Dual Active Bridge converter
PublicationThe article presents a three-phase Medium Frequency Transformer being a part of a 100kW 1.2kV 20kHz Dual Active Bridge DC-DC converter. The transformer design is detailed focusing on winding and core power loss calculation. The high power three-phase MFT prototype is presented. The experimental results include the transformer impedance characteristics, no load test and three-phase DAB full load test waveforms
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Synergistic effects of low-/medium-vacuum carbonization on physico-chemical properties and stability characteristics of biochars
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Unusual behavior of secondary amine group as a leaving group
PublicationIn our recent project we focused on reactivity of2,2-dimethyl-4,6-dioxane-1,3-dione carbamoilo- and thiocarbamoylo- derivatives as a ketenesource. Meldrum`s acid derivatives after thermal decomposition gives substituted keteneswith stoichiometric yield, that can be trapped with various spectrum of nucleophiles likealcohols, thiols, amine, imines etc. In case of5-[3-(dimethylamino)-sulfanyl-propyliden]-2,2-dimethyl-1,3-dioxane-4,6-dione...
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W kierunku zmiennej metafory miasta-miejsca, zdarzenia, krajobrazy. W: Ka- zimierz Wejchert - teoria kompozycji urbanistycznej. Warszawa: Akapit-DTP** 2003 s. 52-61, 3 il. bibliogr. 26 poz. Urbanistyka. Międzyuczelniane Zeszyty Naukowe R. VIII. Red. serii: prof. S. Gzel.
PublicationW latach 60. XX wieku, w dużej mierze za sprawą koncepcji K. Lyncha, corazwyraźniej zaczęła się wykształcać zmiana w wyobrażeniu miasta, które rozu-miane jest dzisiaj nie tylko jako statyczny wzór, ale jako układ wzajemnychoddziaływań, scena życia społecznego, miejsce zdarzeń i dynamicznych wpływówśrodowiska. Miejsca definiowane są dzisiaj nie tylko w kryteriach kompozycy-jnych, ale także poprzez zdarzenia, interakcje, miejskie...
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Preparation, composition and properties of fish silage produced with post-coagulation sludge
PublicationPost-coagulation sludge was added to fish fydrolyzates (silage). Silage was prepared using whole sprats. Technology of the process has been modified and sulphuric acid was replaced with phosphoric acid. The objective was to evaleuate the quality of produced silage during storage, particulary the changes of peroxide value and amount of free acids in silage fat.
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Alkanethiolates of Group 1,2, and 13-15 Metals
PublicationThis manuscript is an update to the earlier Science of Synthesis contribution describing methods for the synthesis of alkanethiolates of group 1, 2, and 13-15 metals. Alkanethiolates can be converted into S-alkyl thiocarboxylic acid esters, 1-thioglycosides, S-alkyl thiosulfinates, tetrahydro-1,4-thiazine-3-ones, sulfides, disulfides, sulfonium salts, dithioacetals and dithioketals, etc. These transformations are accomplished by...
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Pochodne kwasu neopentylidenofosforoditiowego jako substraty do syntezy ugrupowania trisulfidowego
PublicationBadania przeprowadzone w Katedrze Chemii Organicznej Wydziału Chemicznego Politechniki Gdańskiej na przestrzeni ostatnich kilku lat, pokazały wszechstronność pochodnych kwasu neopentylidenofosforoditiowego [32] w syntezie symetrycznie i niesymetrycznie podstawionego ugrupowania disulfidowego. Wyniki powyższych badań doprowadziły do opracowania nowej strategii syntetycznej, umożliwiającej otrzymywanie...
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Application of molecularly imprinted polymer pipette tip micro-solid phase extraction of nalidixic acid and acetaminophen from pills and seawater samples and their determination by spectrophotometry
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Effect of Soybean or Linseed Oil With RRR-D-α-Tocopherol or Dl-α-Tocopherol Acetate on Quality Characteristics and Fatty Acid Profile of Turkey Meat
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Determination of mefenamic acid in urine and pharmaceutical samples by HPLC after pipette-tip solid phase microextraction using zinc sulfide modified carbon nanotubes
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Octanoic Acid—An Insecticidal Metabolite of Conidiobolus coronatus (Entomopthorales) That Affects Two Majors Antifungal Protection Systems in Galleria mellonella (Lepidoptera): Cuticular Lipids and Hemocytes
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Molecular Simulation Study of the Potentials of Mean Force for the Interactions between Models of Like-Charged and between Charged and Nonpolar Amino Acid Side Chains in Water
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