Autor: Ramos, P. - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: EPR examination of free radicals thermally formed in vaselinum flavum
Autorzy:: Ramos, P.
Pilawa, B.
Tematy:: vaselinum flavum
thermal sterilization
free radicals
EPR spectroscopy; Pokaż więcej
Wydawca:: Instytut Chemii i Techniki Jądrowej
Powiązania:: https://bibliotekanauki.pl/articles/148032.pdf Link otwiera się w nowym oknie
Opis:: The popular pharmaceutical base used in pharmacy – vaselinum flavum – was studied by an X-band (9.3 GHz) EPR spectrometer in the range of microwave power of 2.2–70 mW. The samples were sterilized in hot air oven at temperatures: 160°C (120 min), 170°C (60 min), and 180°C (30 min). The aim of this work was to determine properties and free radical concentrations in vaselinum flavum thermally sterilized at different conditions. The changes in free radical system in vaselinum flavum during storage were analyzed. Free radicals were found in all the heated samples. The lowest free radical concentration was obtained for vaselinum flavum heated at 180°C for 30 min; so these parameters are proposed for the thermal sterilization of this pharmaceutical base. Interactions with oxygen decreased free radical concentration in vaselinum flavum during storage. Strong quenching of free radicals in vaselinum flavum was observed after 2 days for the samples sterilized at temperatures 160 and 180°C. Such an effect for vaselinum flavum heated at temperature 170°C was observed later, 13 days after sterilization. Fast spin-lattice relaxation processes exist in thermally sterilized vaselinum flavum. The EPR lines of heated vaselinum flavum were homogeneously broadened. EPR spectroscopy and its use for examining the thermal sterilization process in pharmacy was confirmed.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Network for EPR spectroscopic analysis as a tool in didactic process
Autorzy:: Bernaś, M.
Ramos, P.
Tematy:: interoperacyjne urządzenia medyczne
zdalne szkolenia
algorytm najmniejszego błędu średniokwadratowego
medical devices interoperability
remote training
LMS; Pokaż więcej
Wydawca:: Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Powiązania:: https://bibliotekanauki.pl/articles/332960.pdf Link otwiera się w nowym oknie
Opis:: The paper deals with a new training technologies' development based on distance learning web–services, implemented for laboratory of a Pharmacy Study branch at Medical University in Katowice. The discussed computing interfaces allow students to perform analysis of free radicals' spectra provided by EPR device. These training facilities are now available at home; at their remote terminal. The training resources consist of electronic ⁄ computer based training. The laboratory provide the students with an interface incorporated into simulation packages along with statistic apparatus for data analysis. The dynamically configured application provide the user with his individual set of training samples. Additionally it provides a valuable skill training for students, otherwise available only as part of master ofscience thesis work.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Separation of groups of free radicals from noised EPR spectrum using genetic algorithm and gradient method
Autorzy:: Bernas, M.
Ramos, P.
Tematy:: signal filtering
genetic algorithms
spectra analysis
free radicals
EPR spectroscopy
function approximation
filtrowanie sygnału
algorytmy genetyczne
analiza widma
wolne rodniki
spektroskopia EPR
aproksymacja funkcji; Pokaż więcej
Wydawca:: Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Powiązania:: https://bibliotekanauki.pl/articles/951652.pdf Link otwiera się w nowym oknie
Opis:: Different groups of free radicals exist in biological material like animal tissues or plants parts. The processes like heating or cooling creates additional types of free radicals groups in this organic matter, due to changes in chemical bonds. The paper proposes a method to determine types and concentrations of different groups of free radicals in the matter processed in various temperatures. The method extracts the spectrum of free radicals using electron paramagnetic resonance with the microwave power of 2.2 mW. Then an automatic method to find a best possible fit using limited number of theoretical mathematical functions is proposed. The match is found using spectrum filtration, and a genetic algorithm implementation supported by a Gradient Method. The obtained results were compared against the samples prepared by an expert. Finally, some remarks were given and new possibilities for future research were proposed.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 4.

Tytuł:: DSPIC - Based impedance measuring instrument
Autorzy:: Santos, J.
Ramos, P. M.
Tematy:: impedance measurement
dsPIC
ADC
sine-fitting; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/220477.pdf Link otwiera się w nowym oknie
Opis:: An implemented impedance measuring instrument is described in this paper. The device uses a dsPIC (Digital Signal Peripheral Interface Controller) as a processing unit, and a DDS (Direct Digital Synthesizer) to stimulate the measurement circuit composed by the reference impedance and the unknown impedance. The voltages across the impedances are amplified by programmable gain instrumentation amplifiers and then digitized by analog to digital converters. The impedance is measured by applying a seven-parameter sine-fitting algorithm to estimate the sine signal parameters. The dsPIC communicates through RS-232 or USB with a computer, where the measurement results can be analyzed. The device also has an LCD to display the measurement results.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Wolne rodniki w sterylizowanym termicznie verapamilu
Free radicals in thermally sterilized verapamil
Autorzy:: Ramos, P.
Pepliński, P.
Pilawa, B.
Tematy:: werapamil
sterylizacja termiczna
wolne rodniki
spektroskopia EPR
verapamil
thermal sterilization
free radicals
EPR spectroscopy; Pokaż więcej
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Powiązania:: https://bibliotekanauki.pl/articles/285536.pdf Link otwiera się w nowym oknie
Opis:: Zbadano generowanie wolnych rodników w werapamilu podczas sterylizacji termiczne w temperaturze 180 stopni C. Koncentrację i właściwości wolnych rodników analizowano z zastosowaniem spektroskopii elektronowego rezonansu paramagnetycznego (EPR) na pasmo X (9.3 GHz). Wykazano, że w procesie sterylizacji termicznej powstają w werapamilu stabilne wolne rodniki. Wolne procesy relaksacji spin-sieć oraz silne oddziaływania dipolowe występują w werapamilu. Badania metodą EPR wykazały, że sterylizacja wysokotemperaturowa nie jest zalecana dla werapamilu.
Free radical formation in verapamil during thermal sterilization at temperature 180 degrees of C was studied. Concentration and properties of free radicals were examined by the use of electron paramagnetic resonance (EPR) spectroscopy at X-band (9.3GHz). It was stated that stable free radicals are formed during thermal sterilization of verapamil. Slow spin-lattice relaxation processes and strong dipolar interactions exist in verapamil.EPR studies showed that sterilization at high temperature is not recommended for verapamil.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Powstawanie wolnych rodników podczas rozkładu termicznego monoazotanu izosorbitolu
Formation of free radicals during thermal decomposition of isosorbide mononitrate
Autorzy:: Ramos, P.
Pilawa, B.
Kawka, M.
Tematy:: monoazotan izosorbitolu
rozkład termiczny
wolne rodniki
spektroskopia EPR
isosorbide mononitrate
thermal decomposition
free radicals
EPR spectroscopy; Pokaż więcej
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Powiązania:: https://bibliotekanauki.pl/articles/284359.pdf Link otwiera się w nowym oknie
Opis:: Wykonano badania wolnych rodników generowanych w monazotanie izosorbitolu pod wpływem wysokiej temperatury. Wyznaczono metodą elektronowego rezonansu paramagnetycznego (EPR) koncentrację wolnych rodników w próbce. Zbadano wpływ mocy mikrofalowej na kształt widm EPR monoazotanu izosorbitolu. Analizowano procesy relaksacji spin-spin i spin-sieć. Określono wpływ czasu przechowywania próbki po rozkładzie termicznym na wolne rodniki w leku.
Studies of free radicals formed in isosorbide mononitrate upon high temperature were performed.. Free radical concentration in the sample was determined by electron paramagnetic resonance (EPR) method. Influence of microwave power on lineshape of EPR spectra of isisorbide mononitrate was examined. Spin-spin and spin-lattice relaxation proccesses were analysed. The effect of storage time of the sample on free radicals in the drug was determined.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 7.

Tytuł:: Effect of microwave power on EPR spectra of natural and synthetic dental biocompatible materials
Autorzy:: Adamczyk, J.
Ramos, P.
Pilawa, B.
Tematy:: EPR
microwave saturation
paramagnetic centers
dental biocompatible materials; Pokaż więcej
Wydawca:: Instytut Chemii i Techniki Jądrowej
Powiązania:: https://bibliotekanauki.pl/articles/147235.pdf Link otwiera się w nowym oknie
Opis:: Paramagnetic centers in the two exemplary synthetic and natural dental biocompatible materials applied in implantology were examined by the use of an X-band (9.3 GHz) electron paramagnetic resonance (EPR) spectroscopy. The EPR spectra were measured in the range of microwave power 2.2–70 mW. The aims of this work were to compare paramagnetic centers concentrations in different dental biocompatible materials and to determine the effect of microwave power on parameters of their EPR spectra. It is the very fi rst and innovatory examination of paramagnetic centers in these materials. It was pointed out that paramagnetic centers existed in both natural (~1018 spin/g) and synthetic (~1019 spin/g) dental biocompatible materials, but the lower free radical concentration characterized the natural sample. Continuous microwave saturation of EPR spectra indicated that faster spin-lattice relaxation processes existed in synthetic dental biocompatible materials than in natural material. Linewidths (ΔBpp) of the EPR spectra of the natural dental material slightly increased for the higher microwave powers. Such effect was not observed for the synthetic material. The broad EPR lines (ΔBpp): 2.4 mT, 3.9 mT, were measured for the natural and synthetic dental materials, respectively. Probably strong dipolar interactions between paramagnetic centers in the studied samples may be responsible for their line broadening. EPR spectroscopy is the useful experimental method in the examination of paramagnetic centers in dental biocompatible materials.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Real Time PC Implementation of Power Quality Monitoring System Based on Multiharmonic Least-Squares Fitting
Autorzy:: Ardeleanu, A. S.
Ramos, P. M.
Tematy:: power quality
real time
multiharmonic least-squares fitting; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/220586.pdf Link otwiera się w nowym oknie
Opis:: In this paper, an algorithm that monitors the power system to detect and classify power quality events in real time is presented. The algorithm is able to detect events caused by waveform distortions and variations of the RMS values of the voltage. Detection of the RMS events is done by comparing the RMS values with certain thresholds, while detection of waveform distortions is made using an algorithm based on multiharmonic leasts-squares fitting.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Effect of microwave power on EPR spectra of thermally sterilized eucerinum anhydricum
Autorzy:: Ramos, P.
Pepliński, P.
Pilawa, B.
Tematy:: EPR
microwave saturation
free radicals
eucerinum anhydricum
thermal sterilization; Pokaż więcej
Wydawca:: Instytut Chemii i Techniki Jądrowej
Powiązania:: https://bibliotekanauki.pl/articles/148715.pdf Link otwiera się w nowym oknie
Opis:: Free radicals formed during thermal sterilization of eucerinum anhydricum – the pharmaceutical base were examined by an X-band (9.3 GHz) spectrometer. Eucerinum anhydricum was sterilized at different physical conditions according to the Polish Pharmacopeia norms. The samples were heated at temperatures: 160°C (120 min), 170°C (60 min), and 180°C (30 min). The aim of this study is to compare free radical concentration and effect of microwave power on EPR spectra of eucerinum anhydricum base thermally sterilized at different temperatures and periods of time. The effect of time storage on the free radicals in the heated samples was tested. Free radical concentrations in the sample stored 15 min strongly decreased with the increasing of sterilization temperature, probably as the result of recombination. Storage caused strong decrease of free radical concentrations in the samples, probably as the result of interactions with oxygen. It was observed to be independent of sterilization conditions from 2 days of storage and longer. Because of the lowest free radical concentration, for eucerinum anhydricum thermal sterilization at 180°C for 30 min is recommended. The sterilized samples should be stored at inert atmosphere without oxygen molecules. Fast spin-lattice relaxation processes existed in sterilized eucerinum anhydricum. The character of changes of amplitudes and linewidths of EPR lines with increasing of microwave power was the same for different storage times. The parameters of thermal sterilization and storage time influenced free radical concentration in eucerinum anhydricum, but magnetic spin-lattice interactions were unchanged. The usefulness of EPR spectroscopy in optimization of thermal sterilization process of eucerinum anhydricum was confirmed.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: EPR studies of free radicals in thermally sterilized famotidine
Autorzy:: Ramos, P.
Pilawa, B.
Stroka, E.
Tematy:: free radicals
thermal sterilization
famotidine
electron paramagnetic resonance (EPR) spectroscopy; Pokaż więcej
Wydawca:: Instytut Chemii i Techniki Jądrowej
Powiązania:: https://bibliotekanauki.pl/articles/148414.pdf Link otwiera się w nowym oknie
Opis:: Free radicals formation in thermally sterilized famotidine was studied by the use of an X-band (9.3 GHz) electron paramagnetic resonance (EPR) spectroscopy. The influence of temperature and time of sterilization on free radicals generated in famotidine was determined. The best sterilization conditions for the tested drug were found. Sterilization was done according to the pharmaceutical norms at temperatures 160°C (120 min), 170°C (60 min), and 180°C (30 min). It was pointed out that the optimal temperature of thermal sterilization for famotidine was 170°C and time of heating 60 min in this conditions the lowest free radicals concentration was found. The highest free radicals concentration was measured in famotidine heated at 160°C during 120 min, the long time of sterilization is responsible for this effect. Free radicals concentration changes during storage of famotidine after thermal sterilization. Its value increased with storage time for the drug sterilized at both temperatures of 170°C and 180°C. Free radicals concentration decreases from 7 days after sterilization. Complex system of free radicals with the shape of EPR lines, dependent on microwave power exist in thermally sterilized famotidine. Slow spin-lattice relaxation processes, strong dipolar interactions characterize thermally sterilized famotidine. Microwave saturation indicates that EPR lines of famotidine are homogeneously broadened. The usefulness of EPR spectroscopy to examine of the sterilized drugs was evaluated.
Dostawca treści:: Biblioteka Nauki

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