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Tytuł:
Adsorption of humic acid on mesoporous carbons prepared from poly- (ethylene terephthalate) templated with magnesium compounds
Autorzy:
Karolczyk, J.
Mozia, S.
Morawski, A.W.
Przepiórski, J.
Powiązania:
https://bibliotekanauki.pl/articles/778949.pdf
Data publikacji:
2012
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
porous carbon
adsorption
humic acid
fluorescence spectroscopy
Opis:
Porous carbons obtained from poly(ethylene terephtalate) contained in a mixture with either MgCO3 or Mg(OH)2 were examined as adsorbents for removal of humic acid from water. Adsorption of the model contaminants is discussed in relation to the textural parameters of the obtained carbon materials. Pore structure parameters of the carbonaceous materials were strongly influenced by preparation conditions including temperature and relative amounts of the inorganics used during preparations as template. Porous carbons prepared revealed a potential to purify water from the model contaminant of high molecular weight. The results presented confirmed a key role of mesoporosity in the adsorption of humic acid. Fluorescence spectroscopy was confirmed to be an useful method to evaluate concentration of humic acid in water.
Źródło:
Polish Journal of Chemical Technology; 2012, 14, 4; 95-99
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fluorescence of natural seawater exposed to oil pollution
Autorzy:
Otremba, Z.
Baszanowska, E.
Powiązania:
https://bibliotekanauki.pl/articles/245422.pdf
Data publikacji:
2015
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
marine fleet exploitation
seawater
oil pollution
fluorescence spectroscopy
Opis:
The natural seawater contains both dissolved and suspended organic substances originating from natural sources and human activities – like the marine transport fleet among other. To specify the type and quantity of vitally valid as well as dangerous for properly functioning marine ecosystems substances complicated and sophisticated chemical instrumentation and methodologies must be used. Only a small number of seawater components it is possible easily to determine their concentrations – for example, the salt content is determined directly in the bulk of water through simultaneous measurement of electrolytic conductivity and temperature of water. It is worth to search similarly quick method for oil substances directly in the seawater. Taking into account seawater organic pollutants originating from natural sources inter alia crude oils, the presence of refinery petroleum substances due to their fluorescence in ultra-violet light can be determined based on fluorescence spectroscopy. The aim of this paper is to search fluorescence features of oil substances dissolved in natural seawater based on excitation-emission spectroscopy. In the paper fresh and oily contaminated seawater taken from the coastal area of the Baltic Sea were used. As an oil pollution ‘Petro-baltic’ oil were applied. The natural seawater, at first was laboratory exposed to low extremely amount of oil and then it was examined by fluorescence under UV light. The seawater from vicinity of Gdynia (Poland) were tested as fresh and after artificially contaminated by different amount of oil (from 0.5 to 500 ppm). Spectrofluorometer Hitachi F-7000 FL was applied to measure excitation-emission spectra (EEMs). Low amounts of oil (up to several ppm) cause increasing of main peak in excitation-emission spectra (EEMs). Addition of larger amounts of oil results in appearance new peaks, which originate from fluorescence of soluble fractions of oil artificially added to examined water. These specific features of oil describe the spectroscopic signatures of oil, which is the basis to development operational method of the source of oil pollution identification.
Źródło:
Journal of KONES; 2015, 22, 3; 181-186
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of fluorometric signatures of oil residues in both marine environment and in organic diluent
Autorzy:
Otremba, Z.
Baszanowska, E.
Powiązania:
https://bibliotekanauki.pl/articles/243211.pdf
Data publikacji:
2015
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
oil pollution
seawater
excitation-emission spectra
fluorescence spectroscopy
Opis:
The significant part of petroleum substances is transferred to the marine environment after technical activities (inevitable exploitive spills, illegal discharges). However a certain part of petroleum in seawater coming from the natural sources. Therefore, to develop the safety of natural marine environment it is necessary to track not only the anthropogenic pollutants but also the natural sources of petroleum. To distinguish both source of oil the fluorescence properties of oil can be used as the tools to oil identification. The aim of the study is to describe the optical properties of crude oil after it contact with aquatic environment based on fluorescence spectroscopy. For the study, crude oil ‘Petrobaltic’ type potentially found in marine environment due to coming from natural source was applied. To dissolve oil, two different solvent – hexane and Baltic seawater form the Gdynia coast were used. To measure the excitation-emission spectra (EEMs) of oil spectrofluorometer Hitachi F-7000 FL was applied. In the paper, we discuss the changes of oil EEMs in two cases for oil dissolved in n-hexane and for oil dissolved in seawater for various oil concentration. Obtained EEMs for oil dissolved in seawater indicate that EEMs spectrum contain the main peak – describing by the wavelength – independent fluorescence maximum, which was detected for oil dissolved in n-hexane (typical for this kind of oil). However, the intensity of oil fluorescence decreases after oil contact with seawater. This approach could allow expanding the description of complex mixtures of oils as a possible tool proposed for identification the type and origin of oil found in marine environment.
Źródło:
Journal of KONES; 2015, 22, 3; 175-179
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Testing of the synchronous fluorescence in application to used lubricate oil characterisation
Autorzy:
Baszanowska, E.
Otremba, Z.
Powiązania:
https://bibliotekanauki.pl/articles/243560.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
marine fleet exploitation
lubricate oil
fluorescence spectroscopy
synchronous fluorescence spectra
Opis:
Reliability of the ship propulsion system depends, inter alia, on the quality of lubricate oils. Research indicates that exploitive features of oil are reduced with it runtime in the ship engine circuit. At the present the basic parameters representing exploitive features of oil are: water content, total acid number and total base number or viscosity vs. temperature, anti-wear performance, further: content of additives and their concentrations, reaction products, and other contaminating substances, also magnetically separated large ferromagnetic particles, the size, the shape, the composition and concentration of the abnormal wear particles. Additional properties of oil are described based on atomic emission spectroscopy, granulometry of separated from the lubricant sample by magnets and gravity, permeability changes, as well as rheometric and tribometric characteristics. Complexity of composition of lubricate oil raises the idea to use changes of relative content of any compounds for characterization of oil exploitive features. Fluorescence method is possible to use for oil properties characterisation due to the presence mono and polycyclic compounds in oil that induces fluorescence phenomenon. Therefore identification the fluorescence spectra when exploitation time of oil increases could be novel indicator to monitor of lubricate oil exploitive quality. In this study we present changes of oil fluorescence expressed by synchronous spectra, taking into account working time of exemplary lubricate oil in the ship engine.
Źródło:
Journal of KONES; 2016, 23, 2; 39-44
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synchronous fluorescence spectra of water contaminated by dispersed crude oil
Autorzy:
Baszanowska, Emilia
Otremba, Zbigniew
Powiązania:
https://bibliotekanauki.pl/articles/174431.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
petroleum
dispersed oil
synchronous fluorescence spectroscopy
marine environment
Opis:
The development of petroleum extraction and transport technology does not ensure complete isolation of these substances from the natural environment. This problem is exacerbated by the location of mining equipment on the sea shelf and the fact that numerous submarine pipelines, tankers and handling terminals can also emit oil pollution. Therefore, the possibility of detecting oil dispersed in the water is particularly important. This paper reports the efforts to identify methods of characterization of the water containing the crude oil emulsion in a very low concentration (a few to several tens of ppm). Due to this, the effect of emulsion concentration on the possibility of its objective characterization using synchronous fluorescence spectra was studied. The similarity of spectra at various oil concentrations was analysed. It has been shown that the stabilization of the shape of synchronous fluorescence spectra occurs at relatively low oil concentrations.
Źródło:
Optica Applicata; 2020, 50, 1; 161-169
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of adsorption of heavy metals from water solutions by wood of selected domestic species using X-Ray Fluorescence (XRF)
Autorzy:
Balicka, Adrianna
Szadkowski, Jan
Powiązania:
https://bibliotekanauki.pl/articles/2200144.pdf
Data publikacji:
2020
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
X-Ray Fluorescence Spectroscopy
wood shaving
adsorption
heavy metals
Opis:
Analysis of adsorption of heavy metals from water solutions by wood of selected domestic species using X-Ray Fluorescence (XRF).The aim of this study was to analyze the absorption of three specific heavy metals from model water solution by wood species from domestic Polish forests. This paper focuses on XRF method to determine metal content in samples. European aspen (Populus tremula L.) and Black locust (Robinia pseudoacacia L.) have been chosen. Firstly, shavings were prepared and soaked with standard solutions of lead (II) nitrate, cadmium nitrate and mercury (II) chloride for 7 days. Then, the material was dried and reduced to ashes using muffle furnace. Finally, content of absorbed metal was marked (XRF) and analyzed with a view to initial contents of metal ions in standard solutions. It was established, that the higher the concentration of mercury in standard solution is, the higher impulse counts is obtained for European aspen. This reversal of the dependence is noticeable for second analyzed species.
Badanie adsorpcji metali ciężkich z modelowych roztworów wodnych przez drewno wybranych gatunków krajowych za pomocą Spektrometrii Fluorescencji Rentgenowskiej (XRF). Celem wykonanych badań było sprawdzenie poziomu adsorpcji wytypowanych metali ciężkich tj. ołowiu, kadmu oraz rtęci, przez dwa gatunki rodzime topolę (Populus tremula L.) oraz robinię akacjową (Robinia pseudoacacia L.). W fazie przygotowawczej materiał został znacznie rozdrobniony i rozdzielony na kilka frakcji. Działanie to miało na celu zwiększenie powierzchni adsorpcji badanego drewna. Azotan kadmu (II), azotan ołowiu oraz chlorek rtęci (II) zostały rozpuszczone w destylowanej wodzie w takich proporcjach, aby stworzyć po cztery roztwory – każdy o innym stężeniu. Wybrana frakcja wiórów została poddana obróbce termicznej w wodzie destylowanej w celu usunięcia zawartego powietrza. Następnie frakcję podzielono na próbki 1 gramowe. Drewno nasiąkało w modelowych roztworach przez ok. 168 godzin. Finalnie zostało ono odsączone, wysuszone i spopielone w piecu muflowym. Tak przygotowane próbki zostały poddane badaniu z wykorzystaniem spektrometrii fluorescencji rentgenowskiej (XRF). Urządzenie analizowało zawartość metali w pyle za pomocą dwóch różnych programów i trzech czasów naświetlania. Otrzymane wartości analizowano pod kątem ilościowym a nie jakościowym.
Źródło:
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology; 2020, 111; 73--82
1898-5912
Pojawia się w:
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fluorescence spectra of oil after it contacts with aquatic environment
Autorzy:
Baszanowska, E.
Otremba, Z.
Toczek, H.
Rohde, P.
Powiązania:
https://bibliotekanauki.pl/articles/245054.pdf
Data publikacji:
2013
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
oil pollution
fluorescence spectroscopy
excitation-emission spectra
seawater
environment protection
Opis:
The main task for natural marine environment protection is to prevent the inflow of various contaminants including oil substances and the real challenge is the ability to rapidly detect these pollutants. Moreover important is to find the source or the maker of the oil spill. In this paper, we consider fundamental physical aspects in the area of possibility of monitoring the natural marine ecosystem based on fluorescence spectroscopy. We utilize the fluorescence ability of numerous oil components – mainly polycyclic hydrocarbons. The paper concerns the spectrofluorimetric characterization of oils have been in use during exploitation of the marine fleet, i.e. lubricate oil, fuels, transformer and hydraulic oils as well as crude oils or their residues. Every kind of oil has a chance to enter the marine environment, especially in a case of ship emergency or after collision with other vessel ore shoreline structure as well as when ship enters the stranding. After discharge of oil, some of oil components are dissolved in the water, bacteria or photochemical reactions, which results in transformation of composition of oil, degrade some. Fluorescence spectrometer Perkin Elmer LS55 was applied to obtain the fluorescence spectra using different excitation wavelength in the range from 240 nm to 500 nm. We discuss the changes of the shapes of excitationemission spectra (EEMs) of various types of oil and the EEMs spectra after contact of oil with seawater as an oil-inwater emulsion, which is the most frequent form of oil in the water column. Significant changes in the shape of spectra and displacement of the peaks are observed.
Źródło:
Journal of KONES; 2013, 20, 3; 29-34
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
In vitro fluorescence studies of transcription factor IIB-DNA interaction
Autorzy:
Górecki, Andrzej
Figiel, Małgorzata
Dziedzicka-Wasylewska, Marta
Powiązania:
https://bibliotekanauki.pl/articles/1038975.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
transcription factors
TF2B
TFIIB
fluorescence spectroscopy
fluorescence quenching
site directed mutagenesis
Opis:
General transcription factor TFIIB is one of the basal constituents of the preinitiation complex of eukaryotic RNA polymerase II, acting as a bridge between the preinitiation complex and the polymerase, and binding promoter DNA in an asymmetric manner, thereby defining the direction of the transcription. Methods of fluorescence spectroscopy together with circular dichroism spectroscopy were used to observe conformational changes in the structure of recombinant human TFIIB after binding to specific DNA sequence. To facilitate the exploration of the structural changes, several site-directed mutations have been introduced altering the fluorescence properties of the protein. Our observations showed that binding of specific DNA sequences changed the protein structure and dynamics, and TFIIB may exist in two conformational states, which can be described by a different microenvironment of W52. Fluorescence studies using both intrinsic and exogenous fluorophores showed that these changes significantly depended on the recognition sequence and concerned various regions of the protein, including those interacting with other transcription factors and RNA polymerase II. DNA binding can cause rearrangements in regions of proteins interacting with the polymerase in a manner dependent on the recognized sequences, and therefore, influence the gene expression.
Źródło:
Acta Biochimica Polonica; 2015, 62, 3; 413-421
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The archaeometric, formal and stylistic analysis of a black-glazed fish-plate from the National Museum in Poznań
Autorzy:
Głuszek, Inga
Krueger, Michał
Powiązania:
https://bibliotekanauki.pl/articles/958155.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Rzeszowski. Instytut Archeologii Uniwersytetu Rzeszowskiego. Muzeum Okręgowe w Rzeszowie
Tematy:
black-glaze pottery
X-ray fluorescence spectroscopy
provenience
multivariate analyses
museum collections
Opis:
This paper presents the results of the XRF, formal and stylistic analyses of a black-glaze fish-plate from the National Museum in Poznań. A non-invasive portable X-ray fluorescence spectrometer (pXRF) has been used to determine the chemical composition of the plate. Analysis of the shape and decoration provided data on the chronology, typology and provenance of the vessel. The obtained results were used to determine the possible region of the fish-plate’s production. The form of the fish-plate represents features characteristic for the early stage of Italian black-glaze production, which is combination of Athenian traditions with new solutions in terms of proportion and shape. The analysis of X-ray fluorescence spectrometry data and comparative studies with already known results of the Italian black glaze pottery chemical analyses allowed the fish-plate to be identified as an example of the Campania A group from ancient Naples workshops, dated to the second half of the 4th century BC.
Źródło:
Analecta Archaeologica Ressoviensia; 2019, 14; 81-90
2084-4409
Pojawia się w:
Analecta Archaeologica Ressoviensia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Oil identification based on total synchronous spectra
Autorzy:
Baszanowska, E.
Otremba, Z.
Powiązania:
https://bibliotekanauki.pl/articles/246342.pdf
Data publikacji:
2014
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
fluorescence spectroscopy
total synchronous spectra
lubricate oil
vessel engine room
marine environment
Opis:
Contribution of marine carriage in the global transport is in permanent developing. It leads to increase the unintentional oil spills, which may induce serious disturbances in functioning of the natural marine ecosystem, especially when it interferes with other technical activities in the marine space. That fact contributes to increase the interest in searching of new research techniques to protect the natural ecosystem. Therefore, the main task of marine international organisations concentrates on the effective and rapid detection of oil spill and on the possibility of identifying oil pollutants as well as on origin of pollution. The purpose of the study is to characterise the oil belonging to the vessel engine lubricate oils. We analyse the stage results of investigations based on one of types of fluorescence spectroscopy, namely: synchronous spectra. To characterise the oil, the Aqualog Horiba spectrofluorometer was applied, which allows performing precise measurement in a short time. Based on the measured excitation-emission spectra, total synchronous fluorescence spectra for oil were obtained using various wavelength intervals. Total synchronous fluorescence spectra of petroleum substances allow finding wavelength interval typical for particular type of oil. This approach could allow obtaining of complex mixtures, such as oils, more efficient description. We discuss the total synchronous fluorescence spectra for engine oil (Marinol type) dissolved in n-hexane in various concentrations of oil as a possible tool proposed to oil type identification. We present changes and variation of the total synchronous fluorescence spectra for oil with various oil concentrations.
Źródło:
Journal of KONES; 2014, 21, 2; 15-20
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Changes in the fluorescence excitation and emissions spectra of heated and frying rapeseed oil and sunflower oil
Autorzy:
Szukay, Beata
Stachura, Wojciech
Saletnik, Łukasz
Budzyński, Jacek
Szymańska, Justyna
Fisz, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/410481.pdf
Data publikacji:
2019
Wydawca:
Politechnika Łódzka. Wydawnictwo Politechniki Łódzkiej
Tematy:
fluorescence spectroscopy
vegetable oils
deep frying
spektroskopia fluorescencyjna
oleje roślinne
smażenie zanurzeniowe
Opis:
Frying is a popular method of cooking (meals preparation). Heating and deep-fat frying cause a series of chemical reactions, such as oxidation of polyunsaturated fatty acids and vitamin E, as well as formation of trans isomers and products of peroxidation. These chemical reactions cause organoleptic and nutritional changes in the product, which may have a negative effect on health. For this reason, the usefulness of many methods for evaluation of refined oils quality is investigated. The fluorescence spectroscopy is increasingly used for this purpose. The aim of the study was to monitor the changes in emission and excitation spectra of refined rapeseed oil and sunflower oil after processes of heating and frying frozen French fries. The obtained results show the differences between the shapes of fluorescence excitation and emission spectra of both oils due to the two processes and these changes depend on duration of both processes. This study indicates that fluorescence spectroscopy is a promising method for evaluation of changes in oils during heating or frying.
Źródło:
Biotechnology and Food Science; 2019, 83, 1; 49-56
2084-0136
2299-6818
Pojawia się w:
Biotechnology and Food Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Porównanie liniowych metod PCA (Principal Component Analysis) i LDA (Linear Discriminant Analysis) zastosowanych do klasyfikacji matryc wzbudzeniowo-emisyjnych wybranych grup substancji biologicznych
Comparison of Principal Component Analysis and Linear Discriminant Analysis applied to classification of excitation-emission matrices of the selected biological material
Autorzy:
Leśkiewicz, M.
Kaliszewski, M.
Mierczyk, Z.
Włodarski, M.
Powiązania:
https://bibliotekanauki.pl/articles/211300.pdf
Data publikacji:
2016
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
analiza cech
spektroskopia fluorescencyjna
klasyfikacja substancji biologicznych
Feature Analysis
Fluorescence Spectroscopy
Biological Material Classification
Opis:
W pracy porównano właściwości dwóch liniowych metod (PCA i LDA) pozwalających na redukcję wymiarów w trakcie analizy cech oraz zbadano wydajność tych dwóch algorytmów w procesie klasyfikacji wybranego materiału biologicznego na podstawie jego wzbudzeniowo-emisyjnych matryc fluorescencyjnych. Stwierdzono, że metoda LDA redukuje liczbę wymiarów (znaczących zmiennych) bardziej efektywnie niż metoda PCA. Za pomocą algorytmu LDA udało się uzyskać względnie dobre rozróżnienie badanego materiału biologicznego.
Quality of two linear methods (PCA and LDA) applied to reduce dimensionality of feature analysis is compared and efficiency of their algorithms in classification of the selected biological materials according to their excitation-emission fluorescence matrices is examined. It has been found that LDA method reduces the dimensions (or a number of significant variables) more effectively than PCA method. Arelatively good discrimination within the examined biological material has been obtained with the use of LDA algorithm.
Źródło:
Biuletyn Wojskowej Akademii Technicznej; 2016, 65, 1; 15-31
1234-5865
Pojawia się w:
Biuletyn Wojskowej Akademii Technicznej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dansylated analogues of the opioid peptide [Dmt1]DALDA: in vitro activity profiles and fluorescence parameters.
Autorzy:
Berezowska, Irena
Lemieux, Carole
Chung, Nga
Zelent, Bogumil
Schiller, Peter
Powiązania:
https://bibliotekanauki.pl/articles/1043324.pdf
Data publikacji:
2004
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
fluorescence spectroscopy
opioid activity profile in vitro
fluorescence quantum yield
opioid peptides
fluorescent opioid peptide analogues
[Dmt1]DALDA
Opis:
Dansylated analogues of the potent and selective μ opioid peptide agonist [Dmt1]DALDA (H-Dmt-D-Arg-Phe-Lys-NH2; Dmt = 2',6'-dimethyltyrosine) were prepared either by substitution of Nβ-dansyl-α,β-diaminopropionic acid or Nε-dansyllysine for Lys4, or by attachment of a dansyl group to the C-terminal carboxamide function via a linker. All three analogues displayed high μ agonist potency in vitro and the C-terminally dansylated one retained significant μ receptor selectivity. The three analogues showed interesting differences in their fluorescence emission maxima and quantum yields, indicating that the dansyl group in two of them was engaged in intramolecular hydrophobic interactions. These dansylated [Dmt1]DALDA analogues represent valuable tools for binding studies, cellular uptake and intracellular distribution studies, and tissue distribution studies.
Źródło:
Acta Biochimica Polonica; 2004, 51, 1; 107-113
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zastosowanie fluorescencyjnej spektroskopii synchronicznej do oceny jakości próbek ziarna pszenicy i nasion rzepaku
Application of synchronous scanning fluorescence spectroscopy to analysis quality of wheat grain and rapeseed samples
Autorzy:
Tańska, M.
Konopka, I.
Smyk, B.
Konopka, S.
Powiązania:
https://bibliotekanauki.pl/articles/271121.pdf
Data publikacji:
2013
Wydawca:
Centralny Ośrodek Badawczo-Rozwojowy Aparatury Badawczej i Dydaktycznej, COBRABiD
Tematy:
pszenica
rzepak
fluorescencyjna spektroskopia synchroniczna
analiza składowych głównych
wheat
rapeseed
synchronous scanning fluorescence spectroscopy
principal component analysis
Opis:
Celem prezentowanych badań było określenie możliwości zastosowania synchronicznej fluorescencji do odróżniania próbek ziarna pszenicy oraz nasion rzepaku różniących się jakością. Ocenie poddano próbki ziarna/nasion „zdrowych" oraz eksperymentalnie uszkodzonych termicznie (przesuszenie) i hydrolityczno-mikrobiologicznie (przechowywanie w warunkach podwyższonej wilgotności). Jakość kontrolnych próbek ziarna pszenicy i nasion rzepaku oceniono za pomocą standardowych wyróżników technologicznych oraz za pomocą analizy zawartości wybranych związków bioaktywnych (kwasy fenolowe, toko- chromanole, chlorofile). Wszystkie próbki poddano analizie spektralnej wykorzystując rejestrację synchroniczną widm fluorescencji. Zastosowanie analizy składowych głównych (PCA) pozwoliło na wskazanie głównych obszarów spektralnych wskazujących na różne typy (jakość) analizowanych próbek. Zastosowane warianty uszkodzenia ziaren/nasion bardziej wpłynęły na próbki nasion rzepaku.
The aim of this study was to determine the possibility of using synchronous fluorescence to distinguish the wheat grain and rapeseed samples of different quality. We compared "healthy" grain/seed samples and experimentally damaged by heat (drying) and moisture-microbial deteriorated by storing at high moisture content. Quality of control samples was evaluated using standard methods according to Polish Standards. Additionally some selected bioactive compounds (phenolic acids, tocochromanols and chlorophylls) were also analyzed. All samples were subjected to spectral analyses using synchronous fluorescence spectroscopy. Application of principal component analysis (PCA) allowed us to identify the main areas indicating different spectral types (quality) of the analyzed samples. Utilized variants of the grains/seeds deterioration affected more significantly the rapeseed samples quality.
Źródło:
Aparatura Badawcza i Dydaktyczna; 2013, 18, 4; 355-363
2392-1765
Pojawia się w:
Aparatura Badawcza i Dydaktyczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Archaeometallurgical Investigations of the Early Iron Age Casting Workshop at Kamieniec. A Preliminary Study
Autorzy:
Garbacz-Klempka, A.
Kowalski, Ł.
Kozana, J.
Gackowski, J.
Perek-Nowak, M.
Szczepańska, G.
Piękoś, M.
Powiązania:
https://bibliotekanauki.pl/articles/383062.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
non-destructive testing
investment casting
X-ray fluorescence spectroscopy
archaeometallurgy
Lusatian culture
badania nieniszczące
odlewnictwo
promieniowanie rentgenowskie
kultura łużycka
Opis:
(Chełmno land, Poland) as it is reflected through casting workshop recovered during recent excavations. Among ready products, the ones giving evidence of local metallurgy (e.g. casting moulds and main runners) were also identified. With the shrinkage cavities and dendritic microstructures revealed, the artifacts prove the implementing a casting method by the Lusatian culture metalworkers. The elemental composition indicates application of two main types of bronzes: Cu-Sn and Cu-Pb. Aside these main alloying additions, some natural impurities such as silver, arsenic, antimony and nickel were found which may be attributed to the origin of the ore and casting technology. The collection from Kamieniec was described in terms of its structure and composition. The investigations were made by means of the energy dispersive X-ray fluorescence spectroscopy (ED-XRF), scanning electron microscopy (SEM) coupled with an energy dispersive X-ray analysis system (EDS) and optical microscopy (OM). In order to fingerprint either local or non-local profile of the alloys, the ED-XRF data-set was statistically evaluated using a factor analysis (FA).
Źródło:
Archives of Foundry Engineering; 2016, 16, 3; 29-34
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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