Search results for: B. Pilawa

Items from 1 to 20 out of 94 results

article

Effect of ultraviolet irradiation on free radical scavenging activity of immunosuppressants used in lung transplantation and comparative electron paramagnetic resonance study of kinetics of their interactions with model free radicals

A. Stanjek‐Cichoracka, S. Żegleń, P. Ramos, B. Pilawa, more

Journal of Clinical Pharmacy and Therapeutics > 43 > 3 > 385 - 392

What is known and objective The immunosuppressive drugs used in solid organ transplantation or autoimmunological processes were studied by electron paramagnetic resonance (EPR) spectroscopy to estimate their free radical scavenging activity. The interactions of immunosuppressants with free radicals were examined by an X‐band (9.3 GHz) EPR spectroscopy and a model of DPPH free radicals. Methods...

article

Groups of Paramagnetic Centres in Reduced and Methylated Low Rank Coal

B. Pilawa, H. Wachowska, M. Kozłowski, A. Więckowski, more

Acta Physica Polonica A > 2015 > 128 > 3 > 264-267

Low rank Illinois No. 6 coal was studied by electron paramagnetic resonance EPR spectroscopy. The parameters of EPR spectra (spectroscopic splitting factors g, linewidths ΔB_{pp}, concentrations of paramagnetic centres N) were measured for row and chemically treated coal (demineralized, reduced and methylated samples). The multi-component structure of experimental spectra of this coal was proved....

article

Role of the tuning parameter at magnetic quantum phase transitions

V. Fritsch, O. Stockert, C.-L. Huang, N. Bagrets, more

The European Physical Journal Special Topics > 2015 > 224 > 6 > 997-1019

Heavy-fermion systems, with their competition between Kondo and RKKY interactions, offer a rich variety of materials that may be driven to a magnetic quantum phase transition. Quite often, a quantum critical point can be approached by chemical substitution, notably of isoelectric ligands of Ce, as in CeCu_6−xAu_x and CePd_1−xNi_xAl. While in the former we compare pressure and concentration tuning...

article

Effect of microwave power on EPR spectra of natural and synthetic dental biocompatible materials

J. Adamczyk, P. Ramos, B. Pilawa

Nukleonika > 2015 > Vol. 60, No. 3, part 1 > 449--453

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...

article

Effect of microwave power on EPR spectra of thermally sterilized eucerinum anhydricum

P. Ramos, P. Pepliński, B. Pilawa

Nukleonika > 2015 > Vol. 60, No. 3, part 1 > 439--442

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...

article

Effect of UV irradiation on free radicals in synthetic melanin and melanin biopolymer from Sepia offi cinalis : EPR examination

M. Zdybel, B. Pilawa

Nukleonika > 2015 > Vol. 60, No. 3, part 1 > 483--488

Free radicals in synthetic melanin and melanin from Sepia officinalis were studied by electron paramagnetic resonance (EPR) spectroscopy. The effect of time of ultraviolet (UV) irradiation on free radicals in these melanins was tested. The samples were exposed to UV during 15, 30, and 60 minutes. EPR spectra were measured with microwaves from an X-band (9.3 GHz) in the range of microwave power of...

article

EPR examination of free radicals thermally formed in vaselinum flavum

P. Ramos, B. Pilawa

Nukleonika > 2015 > Vol. 60, No. 3, part 1 > 443--447

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...

article

Influence of Microwave Power on EPR Signal of Melanin Radical and Copper(II) Ions in DOPA-Melanin Complexes

L. Najder-Kozdrowska, B. Pilawa, A. Więckowski, E. Buszman, more

Acta Physica Polonica A > 2013 > 124 > 1 > 112-114

Electron paramagnetic resonance spectroscopy EPR was used for examination of microwave saturation in DOPA-melanin complexes with kanamycin and Cu(II) ions. The fast spin-lattice relaxation processes take place in system of paramagnetic metal ions. EPR signal of melanin radical saturated with growing of microwave power used during measurements. After adding Cu(II) ions a shortening of relaxation time...

article

EPR studies of Cladosporium cladosporioides complexes with amphotericin B

M. Zdybel, B. Pilawa, E. Buszman, T. Witoszyńska

Nukleonika > 2013 > Vol. 58, No. 3 > 401--405

Free radicals in Cladosporium cladosporioides cultured with amphotericin B were spectroscopically studied. The effect of drug concentrations on free radicals in the fungal melanin biopolymer was examined. It was pointed out that the concentrations of free radicals in the complexes of Cladosporium cladosporioides mycelium with amphotericin B depend on the drug concentrations. Eumelanin dominates in...

article

EPR studies of free radicals in thermally sterilized famotidine

P. Ramos, B. Pilawa, E. Stroka

Nukleonika > 2013 > Vol. 58, No. 3 > 413--418

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...

article

Effect of microwave power on EPR spectra of DOPA-melanin-netilmicin complexes with different drug concentrations : a study at temperatures in the range of 125-275 K

M. Zdybel, B. Pilawa, E. Buszman, D. Wrześniok, more

Nukleonika > 2013 > Vol. 58, No. 3 > 407--411

Electron paramagnetic resonance (EPR) spectra of the model eumelanin – DOPA-melanin complexes with netilmicin measured with a microwave power in the range 0.3–200 mW were examined. The influence of microwave power on amplitudes (A) and linewidths (ΔBpp) of the spectra was determined. The EPR spectra were recorded by a BRUKER spectrometer at temperatures 125, 175, 225 and 275 K. Continuous microwave...

article

ESR Studies of Paramagnetic Centers in Pharmaceutical Materials - Cefaclor and Clarithromycin as an Example

A. Skowronska, M. Wojciechowski, P. Ramos, B. Pilawa, more

Acta Physica Polonica A > 2012 > 121 > 2 > 514-517

Electron spin resonance (ESR) studies of two antibiotics, Cefaclor and Clarithromycin, have been performed in order to investigate concentration and dynamics of free radicals generated in these compounds due to thermal sterilization. For Cefaclor three combinations of temperature and heating time have been applied: 160°C, 170°C, 180°C for 120 min, 60 min, and 30 min, respectively, according to the...

article

Antioxidative properties of bee pollen extracts examined by EPR spectroscopy

A. Rzepecka-Stojko, B. Pilawa, P. Ramos, J. Stojko

Journal of Apicultural Science > 2012 > 56 > 1

article

Złożony układ wolnych rodników w sterylizowanych termicznie lekach glikokortykosteroidowych

M. Kościelniak, B. Pilawa

Engineering of Biomaterials > 2012 > Vol. 15, no. 116-117 spec. iss. > 55--56

Badania finansowane przez Śląski Uniwersytet Medyczny w Katowicach z umowy nr KNW-1-002/P/210 i przez Fundację Rozwoju Kardiochirurgii.

article

Triplet States in DOPA-Melanin and in Its Complexes with Kanamycin and Copper Cu(II) Ions

L. Najder-Kozdrowska, B. Pilawa, E. Buszman, A. Więckowski, more

Acta Physica Polonica A > 2010 > 118 > 4 > 613-618

The mono- and biradical forms of DOPA-melanin (DOPA-eumelanin) were studied by EPR spectroscopy in 100-300 K temperature range. The existence of triplet states in DOPA-melanin was proved. The analysis of EPR spectra has shown that in DOPA-melanin and its complexes with kanamycin and Cu^{2+} ions, two kinds of paramagnetic centres exist. The first of them are in doublet ground state with spin S = 1/2...

article

The dependence of physical structure of a coal heated in a coking chamber on non-uniform distribution of a temperature

S. Pusz, M. Krzesińska, B. Pilawa, A. Koszorek, more

International Journal of Coal Geology > 2010 > 82 > 1-2 > 125-131

Temperature conditions in a coal charge during coking depend on the location towards heating walls of a coke oven. Heating rate as well as residence time in a final temperature distinctly increases from a central axis to heating walls of coking chamber. Differentiated temperature conditions affect physical structure of a coal heated. This influence has been studied using molecular acoustics and densitometric...

article

Changes in a coke structure due to reaction with carbon dioxide

S. Pusz, M. Krzesińska, Ł. Smędowski, J. Majewska, more

International Journal of Coal Geology > 2010 > 81 > 4 > 287-292

Technological properties of a coke directly depend on a coke structure, i.e., on carbon matrix (a solid phase in a porous medium) and on pore system. Coke structure is deeply transformed during blast furnace operation and one of the most important factors responsible for that is the CO ₂ gasification.The objective of this work was to investigate changes of the physical structure of a coke...

article

Effect of storage time on microwave saturation of EPR spectra of thermally sterilized streptomycin and its practical applications

P. Ramos, B. Pilawa, M. Bernaś

Journal of Medical Informatics & Technologies > 2010 > Vol. 15 > 185--191

Electron paramagnetic resonance spectroscopy at X-band (9.3 GHz) is used as the tool of optimalization of storage of thermally sterilized aminoglycoside antibiotic - streptomycin. Thermal sterilization at different conditions was performed according to the norms. Changes in free radicals system of this drug during storage after sterilization were detected. Lineshape analysis and microwave saturation...

article

Application of electron paramagnetic resonance spectroscopy to examination of carbonized coal blends

B. Pilawa, S. Pusz, M. Krzesińska, A. Koszorek, more

International Journal of Coal Geology > 2009 > 77 > 3-4 > 372-376

Paramagnetic centers in two- and three-component coal blends carbonized at 1000 °C were studied by X-band (9.3 GHz) electron paramagnetic resonance (EPR) technique. The blends were prepared from three different Polish coals with carbon contents [wt.%]: 88.66, 86.21, and 82.67, respectively. The aim of this work was to compare EPR parameters and concentrations of paramagnetic centers in the initial...

article

Relationship between the technical parameters of cokes produced from blends of three Polish coals of different coking ability

A. Koszorek, M. Krzesińska, S. Pusz, B. Pilawa, more

International Journal of Coal Geology > 2009 > 77 > 3-4 > 363-371

The demand for metallurgical coke for blast furnaces is forcing the coking industry to look for new sources of coking coals. The physical and chemical parameters of coals used in coking blends determine the quality (reactivity and strength) of the finished cokes. This study examines the technical properties of the cokes produced from various blends of three Polish coals with different coking. These...

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Search results for: B. Pilawa

Effect of ultraviolet irradiation on free radical scavenging activity of immunosuppressants used in lung transplantation and comparative electron paramagnetic resonance study of kinetics of their interactions with model free radicals

Groups of Paramagnetic Centres in Reduced and Methylated Low Rank Coal

Role of the tuning parameter at magnetic quantum phase transitions

Effect of microwave power on EPR spectra of natural and synthetic dental biocompatible materials

Effect of microwave power on EPR spectra of thermally sterilized eucerinum anhydricum

Effect of UV irradiation on free radicals in synthetic melanin and melanin biopolymer from Sepia offi cinalis : EPR examination

EPR examination of free radicals thermally formed in vaselinum flavum

Influence of Microwave Power on EPR Signal of Melanin Radical and Copper(II) Ions in DOPA-Melanin Complexes

EPR studies of Cladosporium cladosporioides complexes with amphotericin B

EPR studies of free radicals in thermally sterilized famotidine

Effect of microwave power on EPR spectra of DOPA-melanin-netilmicin complexes with different drug concentrations : a study at temperatures in the range of 125-275 K

ESR Studies of Paramagnetic Centers in Pharmaceutical Materials - Cefaclor and Clarithromycin as an Example

Antioxidative properties of bee pollen extracts examined by EPR spectroscopy

Złożony układ wolnych rodników w sterylizowanych termicznie lekach glikokortykosteroidowych

Triplet States in DOPA-Melanin and in Its Complexes with Kanamycin and Copper Cu(II) Ions

The dependence of physical structure of a coal heated in a coking chamber on non-uniform distribution of a temperature

Changes in a coke structure due to reaction with carbon dioxide

Effect of storage time on microwave saturation of EPR spectra of thermally sterilized streptomycin and its practical applications

Application of electron paramagnetic resonance spectroscopy to examination of carbonized coal blends

Relationship between the technical parameters of cokes produced from blends of three Polish coals of different coking ability

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