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Wyniki wyszukiwania dla: chemia peptydów
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CHEMICAL ENGINEERING SCIENCE
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DRUG AND CHEMICAL TOXICOLOGY
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Wpływ rodzaju kwasu jako dodatku do eluentu na parametry rozdzielania polifenoli techniką chromatografii cieczowej w odwróconych układach faz (RP-HPLC)
PublikacjaChromatografia cieczowa jest jedną z technik wykorzystywanych w badaniach składu mieszanin, a także do wydzielania czystych składników z mieszanin w postaci frakcji eluatu. Z punktu widzenia współczesnej chemii, farmakologii, a także medycyny, czy biotechnologii, chromatografia pełni ważną rolę, w zakresie analityki jakościowej i ilościowej. Dzięki możliwości otrzymywania naturalnych składników biologicznie czynnych w czystej...
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Method for determination of the chemical composition of phases of the iron catalyst precursor for ammonia synthesis
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Thermodynamics of Chemical Processes in the System of Nanocrystalline Iron–Ammonia–Hydrogen at 350 °C
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Description of plants and assessment of chemical properties of three species from the Amelanchier genus
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Effect of substrate type on the field performance and chemical composition of highbush blueberry cv.Patriot
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Syntheses, structures and chemical properties of unsaturated oligo(alkylene-ester-ether)diols
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Balance of pesticides mass in gas, liquid and solid phase after their chemical degradation.
PublikacjaOpisano metodę usuwania pestycydów z wody przy zastosowaniu fotodegradacji (UV) i katalizatora (TiO2). Efektywność procesu usuwania pestycydów była kontrolowana przy zastosowaniu chromatografu gazowego z detektorem wychwytu elektronów. Oznaczano zawartość pestycydów w wodzie, a także zaadsorbowanych na powierzchni stałej, oraz w fazie gazowej. Największa zawartość pestycydów znajdowała się na fazie stałej, następnie w cieczy i...
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Physical, Chemical and Biological Changes in the Gulf of Gdańsk Ecosystem (Southern Baltic Sea).
PublikacjaPrzedstawiono fizyczne, chemiczne i biologiczne zmiany zachodzące w ekosystemie Zatoki Gdańskiej (Południowy Bałtyk. Opisano klimat (temp. wody, opady poziom morza, zasolenie), fluktuację stężeń związków biogennych (azotany,fosforany, krzemiany), poziom organicznych zanieczyszczeń (POP´s, PcB´, pestycydy, WWA) oraz zmiany w biologicznym życiu morza.
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Elimination of the chemical and microbiological pollutants in the modernized watewater treatment plant ''Wschód'' in Gdańsk.
PublikacjaW artykule przedstawiono wyniki 2 letnich, kompleksowych badań efektywności zanieczyszczeń chemicznych, mikrobiologicznych i parazytologicznych w zmodernizowanej oczyszczalni ścieków ''Wschód'' w Gdańsku. Oceniono wpływ funkcjonowania układu generowania lotnych kwasów tłuszczowych na skuteczność usuwania związków biogennych oraz jego oddziaływanie na eliminację zanieczyszczeń biologicznych z oczyszczonych ścieków
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Centre of Excellence in Envirinmental Analysis and Monitoring at the Chemical Faculty of the Gdańsk University of Technology.
PublikacjaPrzedstawiono działalność Centrum (CEEAM) utworzonego 01.01.2003 na Wydziale Chemicznym PG. Opisano cel powstania, zrealizowane zadania i plany.
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Chemometric exploration of sea water chemical component data sets with missing elements
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Morphologic, Phylogenetic and Chemical Characterization of a Brackish Colonial Picocyanobacterium (Coelosphaeriaceae) with Bioactive Properties
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Raman Spectra Measurements for Chemical Identifications - Aspect of Uncertainty Sources and Reduction of Their Effects
PublikacjaRaman spectrometers enable fast and non-contact identification of examined chemicals. These devices measure Raman spectra and compare with the spectra database to identify unknown and often illicit chemicals (e.g. drugs, explosives) usually without any sample preparation. Raman spectra measurements are a challenge due to noise and interferences present outside the laboratories (field applications). The design of a portable Raman...
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Characteristics, Chemical Modification Processes as well as the Application of Silica and its Modified Forms
PublikacjaThe variety of chemical modifications of the surface of silica and its modified forms cause thesematerials to find a consistently wider scope of application. In the publication, the characteristicsof silica, silica gel, aerogel and xerogel are presented. The obtainment, application and propertiesof these materials are discussed. Methods of chemical modifications of surface structures withthe use of different chemical compounds...
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Effect of chemical composition and microstructure on mechanical properties of BA1055 bronze sand castings.
PublikacjaW pracy wykazano, że nawet małe zmiany w składzie chemicznym brązu aluminiowego BA1055 mają istotny wpływ na strukturę i właściwości mechaniczne odlewów. Określono wpływ wydzieleń międzymetalicznej fazy κ na właściwości odlewów z brązu BA1055 stosowanego na pędniki okrętowe.
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Preparation and characterization of silk fibroin/collagen sponge modified by chemical cross-linking
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INFLUENCE OF THE INTERMOLECULAR INTERACTION ON PHYSICO-CHEMICAL PROPERTIES OF CHITOSAN/HYALURONIC ACID BLENDS
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The Effects of Cross-Link Density and Chemical Exchange on Magnetization Transfer in Polyacrylamide Gels
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The Impact of Effective Microorganisms on Flesh Color and Chemical Composition of Raw Potato Tubers
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Influence of Hydrogenation on Morphology, Chemical Structure and Photocatalytic Efficiency of Graphitic Carbon Nitride
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Solvent effects on the nitrogen NMR chemical shifts in 1-methylazoles – a theoretical study
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Theoretical analysis of solvent effects on nitrogen NMR chemical shifts in oxazoles and oxadiazoles
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Physical, chemical and biochemical properties of Western Siberia Sphagnum and Carex peat soils
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Chemical Munitions Search & Assessment—An evaluation of the dumped munitions problem in the Baltic Sea
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The Use of Chemical Sensors to Monitor Odour Emissions at Municipal Waste Biogas Plants
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Uncertainty in maritime risk analysis: Extended case study on chemical tanker collisions
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Phthalocyanines with bulky substituents at non-peripheral positions – Synthesis and physico-chemical properties
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Optical and chemical characterization of thin TiNx films deposited by DC-magnetron sputtering
PublikacjaThin titanium nitride (tinx) films were deposited on silicon substrates by means of a reactive dc-magnetron plasma. Layers were synthesized under various conditions of discharge power and nitrogen flows in two operation modes of the magnetron (the so-called "balanced" and "unbalanced" modes). The optical constants of the tinx films were investigated by spectroscopic ellipsometry (se). X-ray photoelectron spectroscopy (xps) was...
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Chemical modification of tannins from Acacia mearnsii to produce formaldehyde free flocculant
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A Comprehensive Review on Shilajit: What We Know about Its Chemical Composition
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Determination of the chemical structure of potential organic impurities occurring in drug substance opipramol
PublikacjaThe tricyclic antipsychotic and antidepressant drug opipramol (opipramole) was examined with regard to the chemical structure of its organic impurities. Impurities were isolated from the technical product by chromatographic methods and their chemical structures were established by 1H NMR, MS and FTIR and further confirmed by comparison with commercially available products or with products obtained by independent synthesis, and...
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Consequences of New Approach of Chemical Stability Tests of Active Pharmaceutical Ingredients (APIs)
PublikacjaThere is a great need of broaden look on stability tests of active pharmaceuticalingredients (APIs) in comparison with current requirements contained in pharmacopeia.By usage of many modern analytical methods the conception of monitoring the changesof APIs during initial stage of their exposure to harmful factors has been developed. Newknowledge must be acquired in terms of identification of each degradation...
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Characterization of the Physical, Chemical, and Adsorption Properties of Coal-Fly-Ash–Hydroxyapatite Composites
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Identification of Novel Chemical Scaffolds Inhibiting Trypanothione Synthetase from Pathogenic Trypanosomatids
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Scaffolds Loaded with Dialdehyde Chitosan and Collagen—Their Physico-Chemical Properties and Biological Assessment
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Smuga cienia. Odory z sieci, czyli jak zjeść tę żabę…
PublikacjaFermentacja w sieciach kanalizacyjnych. Emisja gazów. Powstawanie odorów. Przeciwdziałanie, hermetyzacja sieci, systemy filtrów
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Chapter 11 – Application of Chemical Sensors and Sensor Matrixes to Air Quality Evaluation
PublikacjaIndoor and outdoor air quality is one of the key factors influencing human health. However, air quality evaluation is not easy task. Air is a complex system, which is subjected to changes even within short period of time. Progress in analytical methods and analytical tools provides increasingly more reliable information on the condition and quality of indoor and outdoor air. This progress, however, generates an increase in the...
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Chemical Derivatization Processes Applied to Amine Determination in Samples of Different Matrix Composition
PublikacjaAmines are important biological compounds, and so their analysis and monitoring in various matrices is worthy of investigation and development.Due to the polar nature of amines, chromatographic analysis of free amines is generally unsatisfactory owing to adsorption and decomposition of the solute on the column, resulting in peak tailing and losses. Therefore, many derivatization reactions are employed to reduce the polarity, improve...
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Phytoplankton communities of polar regions–Diversity depending on environmental conditions and chemical anthropopressure
PublikacjaThe polar regions (Arctic and Antarctic) constitute up to 14% of the biosphere and offer some of the coldest and most arid Earth's environments. Nevertheless several oxygenic phototrophs including some higher plants, mosses, lichens, various algal groups and cyanobacteria, survive that harsh climate and create the base of the trophic relationships in fragile ecosystems of polar environments. Ecosystems in polar regions are characterized...
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Chemical, thermal and laser processes in recycling of photovoltaic silicon solar cells and modules
PublikacjaIn recent years, photovoltaic power generation systems have been gaining unprecedented attention as an environmentally beneficial method to solve the energy problem. From the economic point of view the pure silicon, which can be recapture from the used cells, is the most important material due to its cost and shortage. In the paper selected methods of used or damaged module and cells recycling and experimental results are presented....
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Anion recognition by phosphonium calix[4]arens: synthesis and physico-chemical studies
Publikacjap-tert-butylcalix[4]arenes in the cone conformation, di-and tetra substituted at the narrow rim with charged phosphonium groups have been synthesies and characterised.
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Determination of the chemical structure of potencial organic impurities occuring in the drug substance opopramol
PublikacjaThe tricyclic antipsychotic and antidepressant drug opipramol was examined with regard to the chemical structure of its organic impurities. Impurities were isolated from the technical product by chromatographic methods and their chemical structures were estabilished by HMNR, MS and FTIR.
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A novel luminescent chemical sensor for the determination of Pb 2+ and Cu 2+ ions
PublikacjaSilica xerogel surface grafted with aminopropyl (PrNH2) groups was additionally treated by cetyltrimethylammonium bromide (CTAB) surfactant and ascorbic acid (asc) in alkaline solution. This material symbolized as SiO2-PrNH2-CTAB/asc, proved to be a stable luminescent material, exhibited an emission band peaked at 393 nm under excitation wavelength 335 nm. Time evolution of the band intensity suggests changes of defect concentration...
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Crystal structure, chemical bonding, and physical properties of layered AIrSn2 (A = Sr and Ba)
PublikacjaWe report the experimental and theoretical investigation of structure, chemical bonding interactions, and physical properties of new ternary stannides AIrSn2 (A = Sr and Ba). AIrSn2 (A = Sr and Ba) crystallizes in the orthorhombic Re3B-type structure with the space group Cmcm (No. 64). According to single-crystal X-ray diffraction results, the structure of AIrSn2 (A = Sr and Ba) can be considered as a Zintl-type compound with heterogeneous...
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Study of Phase and Chemical Composition of Bi1-xNdxFeO3 Powders Derived by Pressureless Sintering
PublikacjaIn the present paper studies on Bi1xNdxFeO3 for x =0.1-0.4 are reported. The mixed oxide method followed with pressureless sintering was employed for ceramics fabrication. Thermal behavior of stoichiometric mixtures of simple oxide powders, viz. Bi2O3, Nd2O3 and Fe2O3 was studied by simultaneous thermal analysis. It was found that with an increase in neodymium content the weight loss increased from 0.75% to 3.16% for x =0.1 and...
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TEST METHOD FOR DETERMINING THE CHEMICAL EMISSIONS OF A MARINE DIESEL ENGINE EXHAUST IN OPERATION
PublikacjaThe article briefly describes the problem of air pollution caused by sea-going ships and the resulting restrictions on the emission of toxic and harmful chemical compounds in the exhaust of marine engines, introduced by the International Maritime Organization (IMO) under the International Convention for the Prevention of Sea Pollution from Ships (MARPOL 73/78). Such emissions provide a significant metrological problem, not only...
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A New Approach to Chemical Recycling of Polyamide 6.6 and Synthesis of Polyurethanes with Recovered Intermediates
PublikacjaA new efficient method for the chemical decomposition of polyamide 6.6 by the glycolysis and amino-glycolysis processes was proposed. The glycolysis was conducted using the mass excess of ethylene glycol (EG) as a decomposing agent in the presence of a catalyst. Also, a mixture of EG and triethylenetetramine was used as another decomposing agent in the amino- glycolysis process. The described process of decomposition did not...
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CHEMICAL ENGINEERING RESEARCH & DESIGN
Czasopisma