Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "spectroscopy FTIR" wg kryterium: Temat

  Lista filtrów
Wyrównaj
Wyświetlanie 1-15 z 35
Tytuł:
FTIR fingerprint — testing a new representation of the binary fingerprint based on FTIR spectra in the prediction of physicochemical properties
Autorzy:
Tomaszewski, Kacper
Kurczab, Rafał
Powiązania:
https://bibliotekanauki.pl/articles/29521107.pdf
Data publikacji:
2023
Wydawca:
Akademia Tarnowska
Tematy:
binary fingerprint
FTIR spectroscopy
Savitzky-Golay filter
FEDS
prediction models
physicochemical properties
binarny odcisk palca
spektroskopia FTIR
filtr Savitzky'ego-Golaya
modele prognostyczne
właściwości fizykochemiczne
Opis:
The paper deals with the development of a new method for the generation of binary fingerprints based on the Savitzky-Golay (SG) algorithm and first-order derivatives of FTIR spectra, which are then used to create prediction models for selected the physicochemical properties of chemical compounds. Models based on the FEDS (Functionally- Enhanced Derivative Spectroscopy) transformation and raw spectra were used as a reference to determine whether the use of the SG filter and first-order derivatives was worth to further develop. The FTIR spectra of 103 compounds with theoretically determined values of logP, logD and logS were studied. The Tanimoto coefficient and correlation coefficient were used to compare the fingerprints obtained, while the root mean square error (RMSE) was used to assess the quality of the prediction models. Based on the results, it was found that the use of the SG filter and derivatives had a positive effect on the quality of the prediction models for logP and logS, and a negative effect on the quality of the models for logD, compared to the models based on original spectra and FEDS transformation.
Źródło:
Science, Technology and Innovation; 2023, 17, 1-2; 9-29
2544-9125
Pojawia się w:
Science, Technology and Innovation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mycoremediation of Heavy Metals Contaminated Soil by Using Indigenous Metallotolerant Fungi
Autorzy:
Akram, Muhammad Bilal
Khan, Ibrar
Ur Rehman, Mujaddad
Sarwar, Abid
Ullah, Najeeb
ur Rahman, Shafiq
Aziz, Tariq
Alharbi, Metab
Alshammari, Abdulrahman
Alasmari, Abdullah F.
Powiązania:
https://bibliotekanauki.pl/articles/27315654.pdf
Data publikacji:
2023
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
Mycoremediation
Heavy Metals Contaminated Soil
Korangi Industrial Estate
FTIR
Fourier Transform Infrared Spectroscopy
SEM
Scanning Electron Microscope
Opis:
The present study was aimed to identify the indigenous fungal strains which could possibly be applied to the bioremediation of heavy metal-contaminated soil. The contaminated soil samples of Korangi Industrial Estate Karachi were found to have total concentration of Cu 1.044 mgL1 , and Pb 0.631 mgL–1. A total of eight indigenous strains of the fungus were isolated and screened for bioremediation capacity from heavy metals-contaminated soil. For the bioremediation of Lead (Pb) these same indigenous eight fungal strains were used for biological remediation. All the fungal isolated with enhanced bioremediation capability were through phenotypic and genotypical characterization. The topology of the phylograms established that the fungal isolates used in this study were allocated to: K1 (Penicillium notatum), K2 (Aspergillus parasiticus), K3 (Aspergillus fumigatus), K4 (Aspergillus flavus), K5 (Aspergillus terries), K6 (Fusarium solani), K7 (Penicillium chrysogenum), K8 (Aspergillus niger), K9 (Penicillium piceum) and K10 (Penicillium restrictum). Thus, K8 fungal isolate was found to be more efficient with maximum bioremediation capacity, for copper and lead removal efficiency, and selected for FTIR and SEM to find out the uptake of Cu and Pb which of the functional groups are involved, and further to detect the effects of bioleaching of both heavy metals on to the surface of K8 fungus biomass. The current study indicates that indigenous fungal isolates could be used with high potency to remediate or clean up the heavy metals-contaminated soil either by the technique of in situ or ex-situ bioremediation.
Źródło:
Polish Journal of Chemical Technology; 2023, 25, 3; 1--13
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modification of Optical, Electronic and Microstructural Properties of PET by 150 keV Cs+ Irradiation
Autorzy:
Musiatowicz, Michał
Turek, Marcin
Droździel, Andrzej
Pyszniak, Krzysztof
Grudziński, Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/2206284.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
polymer modification
PET
ion implantation
FTIR spectroscopy
Raman spectroscopy
conducting layer
Opis:
Thick (0.125 mm) sheet samples of PET were irradiated with 150 keV Cs+ ion beam with fluences in the range from 10^13 cm^-2 up to 10^16 cm^-2). Raman and UV-VIS spectroscopy measurements shown destruction of numerous bonds within the polymer – this effect intensifies with fluence. Raman spectroscopy shows the presence of amorphous graphitelike structures as the broad G band appears in the collected spectrum. The analysis of absorbance spectra also confirms formation of numerous carbon clusters leading to a formation of vast conducting structures in the modified layer of the polymer. One can observe the decrease of optical bandgap from 3.85 eV (typical for pristine PET) to 1.05 eV for the sample implanted with the highest fluence, the effect is weaker than for lighter alkali metal ions. The estimated average number of C atom in a clusters reaches in such case values close to 1100. The changes in the polymer structure lead to intense reduction of electrical sheet resistivity of the modified samples by ~ 8 orders of magnitude in the case of severely modified sample. The dependence of resistivity on temperature has also been measured. The plots of ln(σ) vs 1/T show that band conductivity or nearest neighbor hopping between conducting structures prevail in the considered case
Źródło:
Advances in Science and Technology. Research Journal; 2022, 16, 5; 11-19
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
In situ methanolic solvent synthesis, spectroscopic and thermogravimetric characterizations of three new transition metal complexes of trimethoprim drug
Autorzy:
Refat, Moamen S.
Al-Humaidi, Jehan Y.
El-Sayed, Mohamed Y.
Hassan, Reham F.
Powiązania:
https://bibliotekanauki.pl/articles/1849325.pdf
Data publikacji:
2021
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
complexation
trimethoprim
transition metals
TGA
thermogravimetric analysis
FTIR
Fourier transform infrared spectroscopy
ESR
kinetic thermodynamic parameters
Opis:
Trimethoprim drug (TMP) complexes of copper (II), cobalt (II), and nickel (II) were prepared and discussed by using elemental analysis (C, H, N analysis), magnetic, molar conductance, FTIR, Raman spectroscopy, electron spin resonance (ESR) and UV-vis spectroscopy analyses. TMP drug coordinated as a tridentate ligand towards the respected three metal ions through two nitrogen atoms of amino groups and nitrogen atom of pyrimidine ring which flanked between –NH2 groups, these assignments confirmed by spectroscopic, magnetic, ESR and thermogravimetric analyses with formulas [Cu(TMP)(H2O)3]Cl2, [Co(TMP)(H2O)3]Cl2 and [Ni(TMP) (H2O)]Cl2. Copper (II) and cobalt (II) complexes have an octahedral geometrical structure included one TMP molecule, three coordinated water molecules and two uncoordinated chlorine atoms while, nickel(II)–TMP complex has a tetrahedral geometric configuration that involved one TMP molecule, one coordinated water molecule and two uncoordinated chlorine atoms. The activation energies and other kinetic thermodynamic parameters were estimated based on the employed of the Coats-Redfern and Horowitz-Metzger equations. The nano–structured form of the synthesized TMP complexes was confirmed dependent on the transmission electron microscopy (TEM).
Źródło:
Polish Journal of Chemical Technology; 2021, 23, 1; 60-67
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physicochemical Assessment of the Biodegradability of Agricultural Nonwovens Made of PLA
Ocena fizykochemiczna biodegradowalności agrowłóknin wytworzonych z PLA
Autorzy:
Miros-Kudra, Partycja
Gzyra-Jagieła, Karolina
Kudra, Michał
Powiązania:
https://bibliotekanauki.pl/articles/1419923.pdf
Data publikacji:
2021
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
PLA agricultural nonwovens
degradability
compostability
gel chromatography
GPC
size exclusion chromatography
SEC
Fourier transform infrared spectroscopy
FTIR
agrowłóknina
degradowalność
kompostowalność
chromatografia żelowa
chromatografia wykluczania
spektroskopia w podczerwieni z transformacją Fouriera
Opis:
Compostable biodegradable plastics are an ecological alternative to traditional products based on petroleum derivatives, whose post-use waste may pollute the natural environment. Modern polymer materials show the functional properties of plastics obtained by conventional methods, but they also may be degraded as a result of biochemical transformations in composting. This allows such materials to be included in the scheme of the currently implemented circular economy, which does not generate post-consumer waste. This paper presents methods for the assessment of the biodegradation process of selected agricultural nonwovens produced from commercial PLA 6252D polylactide, supplied by Nature Works® LLC, USA. The agricultural nonwovens tested, obtained by the spun-bond technique, were characterised by different degrees of crystallinity in the range from 11.1% to 31.4%. Biodegradation tests were carried out as simulated aerobic composting while maintaining constant environmental conditions in accordance with test procedures based on PN-EN/ISO standards using the method of sample mass loss determination. Gel chromatography (GPC/SEC) and FTIR spectroscopy were also applied to assess the degree of biodegradation. The aim of this study was to evaluate the effect of the crystallinity of nonwoven made of PLA 6252 D on its degradation in a compost environment.
Kompostowalne tworzywa biodegradowalne są ekologiczną alternatywą dla tradycyjnych produktów opartych na pochodnych ropy naftowej, zalegających i zanieczyszczających środowisko naturalne w formie odpadów poużytkowych. Nowoczesne materiały polimerowe wykazują właściwości użytkowe tworzyw sztucznych otrzymywanych metodami konwencjonalnymi a ponadto ulegają utylizacji na drodze przemian biochemicznych w wyniku kompostowania. Pozwala to na wpisanie się takich materiałów w schemat obecnie pożądanej gospodarki cyrkularnej, która nie generuje odpadów poużytkowych. W niniejszej pracy przedstawiono metody badań biorozkładu wybranych agrowłóknin wytworzonych z komercyjnego polilaktydu PLA 6252D firmy Nature Works® LLC, USA. Badane agrowłókniny otrzymane techniką spun-bonded charakteryzowały się różnymi stopniami krystaliczności w zakresie od 11.1% do 31.4%. Badania biodegradacyjnie prowadzono w procesie symulowanego kompostowania aerobowego z zachowaniem stałych warunków środowiskowych zgodnie z procedurami badawczymi na podstawie norm PN-EN/ISO z wykorzystaniem metody wyznaczania ubytku masy. Do oceny stopnia biodegradacji zastosowano również technikę chromatografii żelowej (GPC/SEC) oraz spektrofotometrię FTIR. Celem pracy było określenie wpływu krystaliczności włóknin wytworzonych z PLA 6252 D na rozkład w środowisku kompostowym.
Źródło:
Fibres & Textiles in Eastern Europe; 2021, 1 (145); 26-34
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis, spectroscopic and thermogravimetric interpretations of UO2(II), ZrO(II), Zr(IV), VO(II) and V(V) ciprofloxacin antibiotic drug complexes
Autorzy:
Albedair, Lamia A.
Powiązania:
https://bibliotekanauki.pl/articles/1849331.pdf
Data publikacji:
2021
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
ciprofloxacin
complexation
FTIR
Fourier transform infrared spectroscopy
diamagnetic
TEM
transmission electron microscopy
nanoscale
Opis:
New five ciprofloxacin (CIP) complexes of dioxouranium(II), oxozirconium(II), zirconium(IV), oxovanadium(II) and vanadium(IV) in the proportion 1:2 have been prepared using CIP as a drug chelate with UO2(NO3)2. 6H2O, ZrOCl2. 8H2O, ZrC4, VOSO4. xH2O and V2O5 respectively. The CIP complexes have been characterized based on the elemental analysis, molar conductance, magnetic, (FTIR & 1HNMR) spectral and thermal studies. The molar conductance studies of the synthesized complexes in DMSO solvent with concentration of 10–3 M indicate their non-electrolytic properties. At room temperature, the magnetic moment measurements revealed a diamagnetic behavior for all CIP prepared complexes. The different formulas of the new complexes can be represented as [UO2(CIP)2(NO3)2] (I), [VO(CIP)2(SO4)(H2O)] (II), [V2(O)(O2)2(CIP)2] (III), [Zr(O)(CIP)2(Cl)2] (IV), and [Zr(CIP)2(Cl)4] (V). The thermal analysis data of the complexes indicates the absence of coordinated water molecules except for vanadyl(II) complex (II). The CIP chelate is a uni-dentate ligand coordinated to the mentioned metal ion through terminal piperazinyl nitrogen. The transmission electron microscopy (TEM) investigation confirms the nano-structured form of the complexes.
Źródło:
Polish Journal of Chemical Technology; 2021, 23, 1; 45-52
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fabrication of Dye Sensitized Solar Cell Based on Natural Photosensitizers
Autorzy:
Nirmala, M.
Sahana, S.
Iswarya, B.
Maruvarasi, K.
Jenita, A. Adline
Kavitha, B.
Powiązania:
https://bibliotekanauki.pl/articles/1031877.pdf
Data publikacji:
2020
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Efficiency
FTIR spectroscopy
Functional
Natural Dyes
Solar cell
nanocrystalline materials
nanocrytalline titanium dioxide
Opis:
Dye Sensitized solar cells were fabricated using with natural extracts and TiO2 is used as a semiconducting layer. The layer of nanocrytalline titanium dioxide was deposited on conductive side of the transparent Fluorine doped Tin Oxide (FTO) glass plate and the other side of the plate is coated with graphite. Voltage and Current values are measured for natural dyes coated FTO plate and I-V characteristic curves of all fabricated cells were drawn and analyzed. The highest power conversion efficiencies of Blueberry (0.79872%) and Beetroot (0.745813 %.) dyes were achieved among 10 dyes. The functional groups of Beetroot and Turmeric natural dyes were confirmed under FTIR spectroscopy. The ease and cost efficiency of the overall fabrication process, extensive availability of these fruits/juices render them novel and low-cost candidates for Solar cell applications.
Źródło:
World Scientific News; 2020, 149; 128-139
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of CuO and V2O5 Effect on IR Spectra of Polycrystalline Bismuth Niobate
Autorzy:
Kuźniarska-Biernacka, I.
Lisińska-Czekaj, A.
Czekaj, D.
Powiązania:
https://bibliotekanauki.pl/articles/352587.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
BiNbO4
ceramics
SEM
FTIR spectroscopy
Opis:
Bismuth niobate (BiNbO4) ceramics were fabricated by mixed oxide method and sintered by presureless sintering method. BiNbO4 ceramics doped with V2 O5 additive in amount 0.125 wt%, 0.250 wt% and 1 wt% of was sintered at T = 910°C whereas BiNbO4 ceramics doped with 2 wt% of CuO additive was sintered at T = 890°C and T = 910°C. It was found that V2 O5 additive improved morphology of the ceramic samples. However, the chemical composition of BiNbO4 ceramics in relation to bismuth oxide and niobium oxide manifested a tendency of lack of Bi2 O3 component. Absorption bands for the BiNbO4 compound were identified. FTIR band positions associated with NbO6 octahedra suggested that the crystal structure changes after V2 O5 incorporation.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 2; 817-821
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of poultry eggs freshness using FTIR spectroscopy combined with HCA and PCA methods
Autorzy:
Michalczyk, E.
Kurczab, R.
Powiązania:
https://bibliotekanauki.pl/articles/93132.pdf
Data publikacji:
2018
Wydawca:
Państwowa Wyższa Szkoła Zawodowa w Tarnowie
Tematy:
egg freshness
FTIR spectroscopy
chemometrics
świeżość jaja
spektroskopia FTIR
chemometria
Opis:
The main aim of this study was to investigate the use of Attenuated Total Reflection Fourier Transform Infrared Spectroscopy (ATR FTIR) and selected chemometric methods to classify eggs in terms of the laying hen farming method, as well as to identify changes in the individual egg compositions during storage. In total, 50 eggs were used for the study; 10 eggs per classes: 0, 1, 2, 3 and rural. Eggs were stored by 29 days period, which was divided on the 10 measuring days in which one egg from each class was tested by recording two FTIR spectra for the shell, albumen and egg yolk. The chemometric analysis, including Hierarchical Cluster Analysis (HCA) and the Principal Component Analysis (PCA), was performed based on the recorded FTIR spectra. Changes in chemical composition during the experiment in individual egg elements were analyzed. Furthermore, by analyzing the graphs (HCA and PCA) obtained by the chemometric analysis, it was noted that the largest changes in the chemical composition of eggs occurred in the shell and yolk, while in the albumen it was less insignificant. The chemometric analysis of the recorded spectra also showed that combination of chemometric methods and FTIR spectroscopy can potentially be used to develop a non-destructive method for classifying eggs in terms of the hen culture method and to monitor of their freshness.
Źródło:
Science, Technology and Innovation; 2018, 2, 1; 7-12
2544-9125
Pojawia się w:
Science, Technology and Innovation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Changes of albumin secondary structure after palmitic acid binding : FT-IR spectroscopic study
Autorzy:
Oleszko, A
Hartwich, J.
Gąsior-Głogowska, M.
Olsztyńska-Janus, S.
Powiązania:
https://bibliotekanauki.pl/articles/307332.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
kwas palmitynowy
albumina
spektrometria FTIR
palmitic acid
albumin
Fourier transform infrared spectroscopy
protein secondary structure
Opis:
Purpose: Albumin is an universal transport protein. Plasma pool of free fatty acids arising from triglyceride hydrolysis, critical in energy metabolism and etiology of metabolic disorders is transported by albumin. According to various studies albumin has from seven to nine binding sites with diverse affinity to long chain fatty acids. X-ray diffraction crystallography measurements have provided data only for pure human serum albumin or albumin with fully saturated binding sites. These results have shown that amount of -helices is higher after fatty acids binding. Molecular mechanics simulations suggest that binding of fatty acids in two high-affinity sites leads to major conformational changes in albumin structure. The aim of this research was to investigate albumin secondary structure upon gradually increasing fatty acids to protein mole ratio. Methods: Fourier transform infrared spectroscopy was applied to study changes of bovine serum albumin (as an analogue of human serum albumin) -helical structures after binding palmitic acid in a range of 0–20 palmitic acid: albumin molar ratios representing pure protein, partial, full saturation and excess binding sites capacity. Results: Amount of -helices was increasing along with the amount of palmitic acid: bovine serum albumin molar ratio and reached maximum value around 2 mol/mol. Conclusions: Our studies confirmed molecular mechanics simulations and crystallographic studies. Palmitic acid binding in two high-affinity sites leads to major structural changes, filling another sites only slightly influenced bovine serum albumin secondary structure. The systematic study of fatty acids and albumin interactions, using an experimental model mimicking metabolic disorders, may results in new tools for personalized nanopharmacotherapy.
Źródło:
Acta of Bioengineering and Biomechanics; 2018, 20, 1; 59-64
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of barium chloride on growth and oxidative stress of saltwater algae
Autorzy:
Sosnowski, Witold
Drozłowska, Emilia
Powiązania:
https://bibliotekanauki.pl/articles/1162581.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
FTIR
IR spectroscopy
Nannochloropsis
TPC
algae
barium chloride
polyphenolic
toxity
Opis:
Algae have the ability to detoxify the environment by binding heavy metals. They are also used as natural biosensors. In this study, the effect of barium chloride on saltwater algae was examined. Direct influence on the development of the test organism was visualized by means of infrared spectroscopy. The direct effect of barium chloride describes the amount of polyphenols and chlorophyll content in the culture. Work indicates the toxicity scale of a relatively small amount of toxic factor. The results were compared with the effects for a non-barium chloride culture.
Źródło:
World Scientific News; 2018, 111; 121-130
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Infrared spectroscopy methods in reservoir rocks analysis – semiquantitative approach for carbonate rocks
Metody spektroskopii w podczerwieni w analizach skał zbiornikowych – podejście półilościowe w badaniach skał węglanowych
Autorzy:
Mroczkowska-Szerszeń, M.
Orzechowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1835138.pdf
Data publikacji:
2018
Wydawca:
Instytut Nafty i Gazu - Państwowy Instytut Badawczy
Tematy:
quantitative rock analysis
PCR
PLS
reservoir rocks analysis
FTIR-ATR spectroscopy
XRD
carbonate rocks
metody ilościowe badania składu skał
analizy skał zbiornikowych
spektroskopia FTIR-ATR
skały węglanowe
Opis:
Experimental results and methodology for mineral composition determination of reservoir rocks by means of Fourier Transformed Infrared Spectroscopy technique (FTIR) was a subject to present in the paper. The FTIR data were calibrated with use of X-ray diffraction and X-ray fluorescence (XRF) methods. This approach allows quantitative and semiquantitative analysis basing on use of statistical methods like PCR (Principal Component Regression) or PLS (Partial Least Squares) to calibrate FTIR ATR in purpose to create efficient and cost saving tool for quick screening analysis of reservoir rocks samples. The presented approach allows for calibration of FTIR ATR using statistical methods like PCR (Principal Component Regression) or PLS (Partial Least Squares) in order to create efficient and cost saving tool for quantitative and semi-quantitative analysis of reservoir rocks samples. In the paper, 18 surface carbonate rocks samples of limestone and dolomite type belonging to the Paleozoic and Mesozoic age from the Kraków–Częstochowa Upland and Main Dolomite from Fore-Sudetic Monocline were analyzed. FTIR results were qualitatively described by analysis together with tentative assignments of their molecular bonds vibrations assignments are presented and a spectra interpretation for typical carbonates associated minerals. The technical constrains of the methodology resulting from proper method calibration and metal oxide analysis limitations were also discussed. Furthermore the behavior of the PCR and PLS algorithms in case of monomineral samples was commented and the necessity of additional qualitative spectra verification was indicated in this case for the final assessment of quantitative data quality. The quantitative results of FTIR analysis were compared with X-ray diffraction (XRD) quantitative data, part of them has been used as validation data. The accordance of the data series was better than 6% for each analyzed mineral phases excluding the outliers indicated by the analytical algorithm. The method was also successfully applied to the quantitative analysis of shale rocks, however, this part of the research will be presented in a separate paper.
Praca przedstawia wyniki eksperymentalne oraz metodologię badania składu mineralnego skał zbiornikowych z zastosowaniem fourierowskiej spektroskopii w podczerwieni (FTIR – Fourier-transformed infrared spectroscopy). Wyniki spektroskopii FTIR kalibrowano z użyciem metod dyfrakcji rentgenowskiej (XRD – X-ray diffraction) oraz fluorescencji rentgenowskiej (XRF – X-ray fluorescence). Takie podejście pozwala na analizę półilościową, a nawet ilościową z zastosowaniem metody FTIR ATR. Metodyka opiera się na użyciu metod statystycznych, takich jak PCR (principal component regression) oraz PLS (partial least squares), do kalibracji metody FTIR ATR za pomocą innych danych w celu stworzenia wydajnego, szybkiego i finalnie niedrogiego narzędzia do zgrubnych (przesiewowych) badań skał zbiornikowych. W opracowaniu przedstawiono przykładowe wyniki analiz skał węglanowych (wapieni i dolomitów) dla 18 próbek skalnych z różnych lokalizacji, w tym próbek powierzchniowych ery paleozoicznej i mezozoicznej z rejonu Jury Krakowsko-Częstochowskiej, z okolic Krakowa, a także próbki reprezentujące dolomit główny z rejonu monokliny przedsudeckiej. Wyniki FTIR opatrzono opisem jakościowym zawierającym szczegółowe przypisania najważniejszych pasm drgań, jak również opisem widm minerałów towarzyszących. Przedstawiono też ograniczenia metody związane z kalibracją, a także z analizami próbek zawierających takie minerały jak piryt i tlenki metali czy też z zachowaniem wybranych algorytmów analizy ilościowej próbek w przybliżeniu monomineralnych. W tym przypadku zaznaczono konieczność przeprowadzenia jakościowej weryfikacji widm dla otrzymanych danych ilościowych, aby zachować ich odpowiednią jakość. Porównano wyniki badań ilościowych FTIR z wynikami ilościowych analiz z użyciem metody dyfrakcji rentgenowskiej (XRD), część wyników traktując jako walidację metody. Otrzymano zgodność na poziomie nie gorszym niż 6% odchyłki dla poszczególnych faz, nie wliczając wyników odstających, które najczęściej odrzuca metoda jako niespełniające kryteriów. Wyniki dodatkowo weryfikowano, stosując technikę fluorescencji rentgenowskiej XRF. Metodyką tą z powodzeniem posłużono się także w przypadku skał łupkowych, jednak ta część wyników zaprezentowana zostanie w oddzielnym opracowaniu.
Źródło:
Nafta-Gaz; 2018, 74, 11; 802-812
0867-8871
Pojawia się w:
Nafta-Gaz
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surface functionalization of poly(L-lactide-co-glycolide) membranes with amphiphilic poly(2-oxazoline) for guided tissue regeneration and treatment of bone tissue defects
Autorzy:
Tryba, A. M.
Krok-Borkowicz, M.
Paluszkiewicz, C.
Pamuła, E.
Powiązania:
https://bibliotekanauki.pl/articles/283890.pdf
Data publikacji:
2018
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
poly (L-lactide-co-glycolide)
poly (ethylene glycol)
poly (2-oxazolines)
phase separation
Fourier transform infrared spectroscopy (FTIR)
osteoblast-like cells
guided tissue regeneration (GTR)
bone tissue engineering
Opis:
The main challenge of this research was to functionalize the surface of poly(L-lactide-co-glycolide) (PLGA) membranes with amphiphilic poly(2-oxazoline) (POx) in order to change PLGA chemical state and properties. Poly(2-oxazolines) are very powerful polymers, which thanks to active pendant groups can be easily functionalized with biologically active molecules or peptides. The membranes were prepared by dissolving PLGA, POx, and poly(ethylene glycol) (PEG, 1000 Da) in methylene chloride (DCM), followed by PEG leaching. POx molecules were preferentially adsorbed at the interface PLGA-POx-PEG thanks to affinity to both hydrophilic (PEG) and hydrophobic (PLGA) chains. The properties of the membranes were characterized with Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and wettability tests. Cytocompatibility of the materials in contact with osteoblast-like MG-63 cells was studied by evaluation of cell viability (Alamar-Blue test), live/dead and phalloidin/DAPI staining. The results show that the presence of POx influenced topography of the PLGA membranes, but did not have an impact on their wettability. All membranes were fo-und cytocompatible with model osteoblasts. Presence of POx resulted in better cell adhesion as shown by microscopic studies after fluorescence staining for nuclei and cytoskeleton actin filaments. In summary, one-step phase separation process between PLGA, PEG, and POx, dissolved in DCM followed by drying and PEG leaching resulted in cytocompatible PLGA membranes with immobilised POx, which might be considered for guided tissue regeneration technique in periodontology and in bone tissue engineering.
Źródło:
Engineering of Biomaterials; 2018, 21, 147; 16-20
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania FTIR-ATR i fluorescencyjne układów białkowo-lipidowych
FTIR-ATR and fluorescence studies of protein-lipid systems
Autorzy:
Litwińczuk-Mammadova, A.
Cieślik-Boczula, K.
Rospenk, M.
Powiązania:
https://bibliotekanauki.pl/articles/172158.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Chemiczne
Tematy:
spektroskopia FTIR-ATR
spektroskopia fluorescencyjna
anizotropia
efekt REES
wygaszanie fluorescencji
model stanów dyskretnych Trp
sonda fluorescencyjna
białko
lipid
FTIR-ATR spectroscopy
fluorescence spectroscopy
anisotropy
REES effect
fluorescence quenching
fluorescent probes
protein
Opis:
Lipid-protein systems paly curtail roles in living systems [49]. Hence, a determination of their structure at different levels of organization is still one of the most important tasks in many research projects. A study of lipid-protein systems is based on many physicochemical techniques, such as spectroscopy of FTIR, Raman, fluorescence, NMR, EPR, as well as DLS, DSC and TEM methods. In the presented paper tow of the most frequently used methods, that is FTIR and fluorescence spectroscopy, will be discussed in details. They are characterized by a relatively low cost of sample preparation, a short measuring time, and they give a huge number of structural and physicochemical information about lipid-protein systems. In the FTIR-ATR spectroscopy many of vibrational bands are commonly used as very precise vibrational indicators of structural changes in lipids and proteins (Fig. 1) [1–6]. They allows to characterize lipid and protein components separately in mixed systems. Additionally, structural changes in lipid membranes can be monitored in one FTIR-ATR experiment simultaneously in a region of hydrophilic lipid head-groups (Fig. 5) [17, 18], in a hydrophobic part composed of hydrocarbon lipid chains (see Figures 2 and 3) [7–9], and in a lipid membrane interface represented by ester lipid groups (Fig. 4) [4, 6, 11, 12]. A secondary structure of proteins and peptides in different experimental conditions can be defined in the FTIR-ATR spectroscopy on the base of amide I bands (Fig. 6 and Tabs 1, 2 and 3) [20–22]. A fluorescence spectroscopy is a complementary methods to FTIR spectroscopy in a study of lipid-protein systems. It competes information about time-dependent and very fast (in a scale of femtoseconds) structural processes in both lipids [41–45] and proteins [23, 27, 48]. The folding, denaturation, and aggregation of proteins and lipid membranes accompanied by changes in an order, packing and hydration of the system under study [23, 27, 41–45, 48].
Źródło:
Wiadomości Chemiczne; 2017, 71, 1-2; 109-132
0043-5104
2300-0295
Pojawia się w:
Wiadomości Chemiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Detonation nanodiamond particles modified by non-steroidal anti-inflammatory drugs in vitro examination
Autorzy:
Mitura, K.
Wilczek, P.
Niemiec-Cyganek, A.
Morenc, M.
Dudek, M.
Sobczyk-Guzenda, A.
Fraczyk, J.
Kolesińska, B.
Powiązania:
https://bibliotekanauki.pl/articles/284974.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
detonation nanodiamond particles
chemical modification
anti-inflammatory drugs
FTIR spectroscopy
mouse fibroblasts
Opis:
Most recently it has been found that nanodiamond particles have very interesting properties. There are number of research communications that detonation nanodiamond particles (NDPs) are fairly reactive and their surface can be effectively modified by chemical methods. The hydroxyl-modified NDPs were obtained by Fenton reaction, amine-functionalized NDPs were obtained by chemical reduction of the nitro- -functionalized surface and carboxyl-modified NDPs by oxidation by using H2O2 under acidic conditions. NDPs functionalized by hydroxyl- and amine- groups and amino groups were used for covalent binding of non-steroidal anti-inflammatory pharmaceuticals (aspirin, ketoprofen, ibuprofen, naproxen) via ester or amide bonds. These results of the studies proved the activity of the conjugates of active substance-NDP and study the rate of release of active substance from the NDPs surface by in vitro examinations with mouse fibroblasts. The progress of the reaction and the characteristics of the products were determined by using FT-IR. Chemical and physical structures of materials were also investigated by Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS). DRIFT spectra show the modification of nanodiamond by ketoprofen, naproxen, ibuprofen and aspirin.
Źródło:
Engineering of Biomaterials; 2017, 20, 140; 12-20
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 35

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies