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Wyświetlanie 1-15 z 35
Tytuł:
Electron paramagnetic resonance [EPR] investigations of laser induced free radicals in spring wheat grains
Autorzy:
Drozd, D.
Szajner, H.
Jezierski, A.
Powiązania:
https://bibliotekanauki.pl/articles/25812.pdf
Data publikacji:
1999
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
spring wheat
wheat grain
laser
electron paramagnetic resonance
free radical
Źródło:
International Agrophysics; 1999, 13, 3
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Probing iso-1-cytochrome c structure by site-directed spin labeling and electron paramagnetic resonance techniques
Autorzy:
Pyka, Janusz
Osyczka, Artur
Turyna, Bohdan
Blicharski, Wojciech
Froncisz, Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/1044446.pdf
Data publikacji:
1999
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
iso-1-cytochrome c
Saccharomyces cerevisiae
site-directed mutagenesis
spin label
electron paramagnetic resonance
Opis:
A cysteine-specific methanethiosulfonate spin label was introduced into yeast iso-1-cytochrome c at three different positions. The modified forms of cytochrome c included: the wild-type protein labeled at naturally occurring C102, and two mutated proteins, S47C and L85C, labeled at positions 47 and 85, respectively (both S47C and L85C derived from the protein in which C102 had been replaced by threonine). All three spin-labeled protein derivatives were characterized using electron paramagnetic resonance (EPR) techniques. The continuous wave (CW) EPR spectrum of spin label attached to L85C differed from those recorded for spin label attached to C102 or S47C, indicating that spin label at position 85 was more immobilized and exhibited more complex tumbling than spin label at two other positions. The temperature dependence of the CW EPR spectra and CW EPR power saturation revealed further differences of spin-labeled L85C. The results were discussed in terms of application of the site-directed spin labeling technique in probing the local dynamic structure of iso-1-cytochrome c.
Źródło:
Acta Biochimica Polonica; 1999, 46, 4; 889-899
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
In vitro effects of ozone on human erythrocyte membranes: An EPR study
Autorzy:
Górnicki, Albert
Gutsze, Aleksander
Powiązania:
https://bibliotekanauki.pl/articles/1044218.pdf
Data publikacji:
2000
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
spin labelling
erythrocyte membrane fluidity
electron paramagnetic resonance
medical ozone
Opis:
The effects of ozone at different concentrations (10, 30, 45 g/m3) on fluidity and thermotropic properties of erythrocyte membranes were investigated by EPR using two spin probes: 5-doxylstearic acid (5-DSA) and 16-doxylstearic acid (16-DSA). The effect of ozone on the erythrocyte membrane fluidity was a dose-dependent process. The ozone at concentration of 10 g/m3 caused rigidization of the membrane while at concentration of 45 g/m3 increased fluidity both on the surface and in the deeper hydrocarbon region of the membrane. Temperature transitions close to the polar heads region (monitored by 5-DSA) were not sensitive to an increase in ozone concentration. In the case of 16-DSA, low temperature thermotropic transition (around 20°C) gradually decreased with the increase of ozone concentration. High temperature transition (around 40°C) significantly differed at the ozone concentration of 10 g/m3 and 45 g/m3, being higher and lower, respectively, as compared to untreated cells. For the ozone concentration of 45 g/m3 the disappearance of the low temperature break and the appearance of two breaks at 37°C and 16°C were observed.
Źródło:
Acta Biochimica Polonica; 2000, 47, 4; 963-971
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mitochondria recycle nitrite back to the bioregulator nitric monoxide.
Autorzy:
Nohl, Hans
Staniek, Katrin
Sobhian, Babak
Bahrami, Soheyl
Redl, Heinz
Kozlov, Andrey
Powiązania:
https://bibliotekanauki.pl/articles/1044210.pdf
Data publikacji:
2000
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
nitrite reductase
electron paramagnetic resonance
nitric oxide
mitochondria
Opis:
Nitric monoxide (NO) exerts a great variety of physiological functions. L-Arginine supplies amino groups which are transformed to NO in various NO-synthase-active isoenzyme complexes. NO-synthesis is stimulated under various conditions increasing the tissue of stable NO-metabolites. The major oxidation product found is nitrite. Elevated nitrite levels were reported to exist in a variety of diseases including HIV, reperfusion injury and hypovolemic shock. Denitrifying bacteria such as Paracoccus denitrificans have a membrane bound set of cytochromes (cyt cd1, cyt bc) which were shown to be involved in nitrite reduction activities. Mammalian mitochondria have similar cytochromes which form part of the respiratory chain. Like in bacteria quinols are used as reductants of these types of cytochromes. The observation of one-e- divergence from this redox-couple to external dioxygen made us to study whether this site of the respiratory chain may also recycle nitrite back to its bioactive form NO. Thus, the aim of the present study was therefore to confirm the existence of a reductive pathway which reestablishes the existence of the bioregulator NO from its main metabolite NO2-. Our results show that respiring mitochondria readily reduce added nitrite to NO which was made visible by nitrosylation of deoxyhemoglobin. The adduct gives characteristic triplet-ESR-signals. Using inhibitors of the respiratory chain for chemical sequestration of respiratory segments we were able to identify the site where nitrite is reduced. The results confirm the ubiquinone/cyt bc1 couple as the reductant site where nitrite is recycled. The high affinity of NO to the heme-iron of cytochrome oxidase will result in an impairment of mitochondrial energy-production. "Nitrite tolerance" of angina pectoris patients using NO-donors may be explained in that way.
Źródło:
Acta Biochimica Polonica; 2000, 47, 4; 913-921
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Concentration of free radicals in faba bean seeds after the pre-sowing treatment of the seeds with laser light
Autorzy:
Podlesny, J.
Misiak, L.
Koper, R.
Powiązania:
https://bibliotekanauki.pl/articles/25440.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
concentration
laser light
pre-sowing treatment
electron paramagnetic resonance
faba bean
free radical
plant cultivation
seed
Źródło:
International Agrophysics; 2001, 15, 3
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Attaching a spin to a protein - site-directed spin labeling in structural biology
Autorzy:
Czogalla, Aleksander
Pieciul, Aldona
Jezierski, Adam
Sikorski, Aleksander
Powiązania:
https://bibliotekanauki.pl/articles/1041067.pdf
Data publikacji:
2007
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
protein structure
site-directed spin labeling
electron paramagnetic resonance (EPR) spectroscopy
Opis:
Site-directed spin labeling and electron paramagnetic resonance spectroscopy have recently experienced an outburst of multiple applications in protein science. Numerous interesting strategies have been introduced for determining the structure of proteins and its conformational changes at the level of the backbone fold. Moreover, considerable technical development in the field makes the technique an attractive approach for the study of structure and dynamics of membrane proteins and large biological complexes at physiological conditions. This review focuses on a brief description of site-directed spin labeling-derived techniques in the context of their recent applications.
Źródło:
Acta Biochimica Polonica; 2007, 54, 2; 235-244
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparatwe EPR analysis of oxygen interactions with plants carbonized at different temperatures
Autorzy:
Bartłomiejczyk, S.
Pilawa, B.
Krzesińska, M.
Pusz, S.
Zachariasz, J.
Wałach, W.
Powiązania:
https://bibliotekanauki.pl/articles/284848.pdf
Data publikacji:
2008
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
karbonizacja roślin
centra paramagnetyczne
paramagnetyczne utlenianie cząsteczek
elektroniczny rezonans paramagnetyczny
widma EPR
oksymetria
carbonized plants
paramagnetic centers
paramagnetic oxygen molecules
electron paramagnetic resonance
EPR spectra
oximetry
Opis:
Carbon materials, bamboo (Bambusa vulagris) and yucca (Yucca flaccida) pyrolysed at 550°C, 750°C and 950°C, were tested as oximetric probes by electron paramagnetic resonance spectroscopy at X-band (9.3 GHz). The following parameters of the spectra: amplitude, linewidth and g-factor, were determined. Influence of oxygen molecules 02 on EPR spectra of the individual carbon materials was compared. Strong EPR spectra were recorded for samples carbonized at 550°C and weak signals were obtained for plants carbonized at higher temperatures: 750°C and 950°C. It was stated that amplitudes of EPR lines of all the carbonized plants decrease in the air environment compared to amplitudes of spectra measured in vacuum. This effect increases with degree of vacuum. Changes in the EPR spectra of samples studied in the air environment may be applied in medicine to determination of oxygen content in different cells. Because of strong resonance signals as oximetric probes we proposed bamboo and yucca carbonized at 550°C, and we rejected plants carbonized at 750°C and 950°C with Iow EPR signals.
Źródło:
Engineering of Biomaterials; 2008, 11, 73; 3-5
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of oxygen O2 on microwave saturation of EPR lines of plants carbonized at 650°c and potential application in medicine
Autorzy:
Pilawa, B.
Bartłomiejczyk, S.
Krzesińska, M.
Pusz, S.
Zachariasz, J.
Wałach, W.
Powiązania:
https://bibliotekanauki.pl/articles/284844.pdf
Data publikacji:
2008
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
karbonizacja roślin
elektroniczny rezonans paramagnetyczny
EPR
nasycenie mikrofalowe
centra paramagnetyczne
oksymetria
carbonized plants
electron paramagnetic resonance
microwave saturation
paramagnetic centers
oximetry
Opis:
Electron paramagnetic resonance spectroscopy (EPR) was used to examination of spin-lattice relaxation in vascular plants carbonized at 650°C. Application of EPR method of continuous microwave signal saturation in medicine was proposed. The first derivative EPR spectra of pyrolysed bamboo and yucca were measured for samples in air and in vacuum. Influence of microwave power in the range 0.7-100 mW on amplitudes of EPR lines were evaluated. It was stated that amplitudes of the studied carbon materials increase with increasing of microwave power in the studied range. Saturation of EPR lines was not observed, so fast spin-lattice relaxation processes exist in the analyzed materials. Changes of EPR amplitudes for samples in air were slower than for evacuated samples. This effect may be used for determination of oxygen contents in the biological cells cultures and for analysis of optimal parameters of photodynamic therapy of cancer.
Źródło:
Engineering of Biomaterials; 2008, 11, 73; 9-11
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Alanine dosimetry of 60 MeV proton beam - preliminary results
Autorzy:
Michalec, B.
Mierzwińska, G.
Sowa, U.
Ptaszkiewicz, M.
Nowak, T.
Swakoń, J.
Powiązania:
https://bibliotekanauki.pl/articles/146730.pdf
Data publikacji:
2012
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
alanine
dosimetry
electron paramagnetic resonance (EPR)
proton beam
Opis:
Electron paramagnetic resonance (EPR) spectrometry (X-band) was used to determine the dose absorbed in alanine detectors, of different shapes and different alanine content, irradiated with Co-60 gamma rays and in a 60 MeV proton beam. The goal of our study was to confirm applicability of alanine as a passive detector in therapeutic proton beam. In the paper dose response characteristic and relative efficiency of alanine are shown. The study confirmed that alanine detectors with a high alanine content (ca. 95%) may be a useful and convenient tool for dose measurements in proton beams, used for eye cancer treatment.
Źródło:
Nukleonika; 2012, 57, 4; 503-506
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
EPR study on sugar radicals utilized for detection of radiation treatment of food
Autorzy:
Guzik, G. P.
Stachowicz, W.
Michalik, J.
Powiązania:
https://bibliotekanauki.pl/articles/146706.pdf
Data publikacji:
2012
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
density functional theory (DFT)
dried fruits
electron paramagnetic resonance (EPR)
irradiation
mannose
sorbose
Opis:
Radicals produced by ionizing radiation in sugars, the components of dried and raw fruits give rise to stable multicomponent electron paramagnetic resonance (EPR) signals unidentified so far. The subject of the present EPR study is to identify the radicals stabilized in gamma-irradiated crystalline sugars, D(+)mannose and L(-)sorbose extracted from cranberries (Vaccininum oxycoccos) and rowan berries (Sorbus aucuparia), respectively. EPR measurements and density functional theory (DFT) simulations were employed for that purpose.
Źródło:
Nukleonika; 2012, 57, 4; 545-549
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bloch - Siegert shift in the Rabi oscillations on the “dressed” electron spin states
Autorzy:
Fedaruk, R.
Kolasa, A.
Saiko, A. P.
Powiązania:
https://bibliotekanauki.pl/articles/146386.pdf
Data publikacji:
2013
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
electron paramagnetic resonance (EPR)
Bloch-Siegert shift
Rabi oscillation
bichromatic field
dressed state
spin qubit
Opis:
Using electron paramagnetic resonance (EPR) at Rabi frequencies, we study the Bloch-Siegert effect in the coherent dynamics of electron spin states driven by a bichromatic radiation consisting of a transverse microwave (MW) and longitudinal radio frequency (RF) fields. The Rabi oscillations on the electron spin states “dressed” by the MW field are observed at the double resonance, when the MW frequency equals the Larmor frequency of the spin system and the frequency ωrf of the RF field is close to the Rabi frequency ω1 in the MW field. The dispersive (|ωrf – ω1| ~ ωrf, ω1) and near-resonant (ωrf ≈ ω1) regimes are investigated. We demonstrate that the Bloch-Siegert shift increases with increasing RF amplitude and at the fixed RF amplitude it has the largest values in the “low-frequency” (ωrf < ω1) range of the dispersive regime. Experimental results were obtained in the time-resolved EPR for E’1 centres in quartz.
Źródło:
Nukleonika; 2013, 58, 3; 375-378
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
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
Autorzy:
Zdybel, M.
Pilawa, B.
Buszman, E.
Wrześniok, D.
Krzyminiewski, R.
Kruczyński, Z.
Powiązania:
https://bibliotekanauki.pl/articles/146482.pdf
Data publikacji:
2013
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
DOPA-melanin
electron paramagnetic resonance (EPR) spectroscopy
free radicals
netilmicin
Opis:
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 saturation of EPR lines was used to compare the acceleration of spin-lattice relaxation processes in melanin samples. Changes of the parameters of the EPR spectra of DOPA-melanin-netilmicin complexes, with the microwave power for the samples differing in netilmicin concentrations, were observed. The effect of temperature on the changes of the EPR spectra of the analyzed melanin complexes with the microwave power was determined. The spin-lattice relaxation is faster at higher temperatures for all the tested melanin complexes.
Źródło:
Nukleonika; 2013, 58, 3; 407-411
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electron paramagnetic resonance (EPR) study of the short - living radicals generated thermally in phosphorylated maize starch with different amounts of amylose
Autorzy:
Bidzińska, E.
Dyrek, K.
Kruczała, K.
Szczygieł, J.
Wenda, E.
Błaszczak, W.
Fornal, J.
Powiązania:
https://bibliotekanauki.pl/articles/147482.pdf
Data publikacji:
2013
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
carbon centred radicals
electron paramagnetic resonance (EPR) spectroscopy
PBN spin trap
starch phosphates
thermal treatment
Opis:
Quantitative electron paramagnetic resonance (EPR) spectroscopy was used for the determination of a number and properties of short-living radicals generated thermally in maize starch with various amounts of amylose. The EPR spectra of radical adducts with N-tert-butyl-α-phenylnitrone (PBN) spin trap reveal the presence of three types of radicals of mobility related with their localization in the zones of various degree of crystallinity. Hylon VII, which represents a matrix with a high content of amylose, offers better conditions for free rotation of radical species, whereas waxy maize, containing almost exclusively amylopectin, exhibits more restricted dynamics.
Źródło:
Nukleonika; 2013, 58, 3; 429-433
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
EPR measurements of ceramic cores used in the aircraft industry
Autorzy:
Stefaniuk, I.
Rogalska, I..
Potera, P.
Wróbel, D.
Powiązania:
https://bibliotekanauki.pl/articles/148814.pdf
Data publikacji:
2013
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
Al2O3
electron paramagnetic resonance (EPR)
mullite
nanopowders
Opis:
In this work the electron paramagnetic resonance (EPR) spectra of Al2O3 and ZrO2 powders were measured for different size of grains (0.074, 0.044 mm) as well as the mullites (0.07 and 0.12 mm). Also were investigated the ceramic cores. The measurements were performed at room temperature and in the temperature range from 140 up to 380 K. The main purpose of this work was to investigate the possible relationships between the EPR spectra and the size of powder grains as well as the identification of EPR spectra in view of the potential application of EPR technique as a fingerprinting method.
Źródło:
Nukleonika; 2013, 58, 3; 391-395
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
EPR spectroscopy of Cu2+ and Mn2+ in borate glasses
Autorzy:
Drzewiecki, A.
Padlyak, B.
Adamiv, V.
Burak, Y.
Teslyuk, I.
Powiązania:
https://bibliotekanauki.pl/articles/147654.pdf
Data publikacji:
2013
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
borate glasses
Cu2+ paramagnetic centre
electron paramagnetic resonance (EPR) spectroscopy
hyperfine structure
Mn2+ paramagnetic centre
Opis:
Electron paramagnetic resonance (EPR) spectra of the CaB4O7 and LiCaBO3 glasses containing 0.5 and 1.0 mol.% CuO and MnO2 impurity compounds were investigated at room temperature. The glasses with CaB4O7:Cu, LiCaBO3:Cu, CaB4O7:Mn and LiCaBO3:Mn compositions were produced from the corresponding polycrystalline compounds using standard glass synthesis and technological conditions developed by the authors. The EPR spectral parameters of the Cu2+ and Mn2+ centres in both glasses containing 0.5 and 1.0 mol.% CuO and MnO2 doping oxides were determined. Analysis of EPR spectral parameters shows that Cu impurity is incorporated into the CaB4O7 and LiCaBO3 glass network as isolated Cu2+ (3d9, 2D5/2) paramagnetic ions. The Cu2+ ions occupy Ca(Li) sites of the borate glass network coordinated by six O2− anions with geometry of elongated octahedron (D4h symmetry) due to the Jahn- -Teller effect. The EPR spectra of the Mn-doped CaB4O7 and LiCaBO3 glasses are virtually identical and typical of all oxide glasses activated with Mn2+ (3d5, 6S5/2) ions. Observed EPR spectra in the Mn-doped glasses were attributed to isolated Mn2+ (1) centres (geff ≅ 4.3) in octahedral Ca(Li) sites with a strong (fully) rhombic distortion, isolated Mn2+ (2) centres (geff ≅ 2.0) in octahedral Ca(Li) sites with nearly cubic local symmetry as well as pairs and small clusters of the Mn2+ ions, coupled by magnetic dipolar and exchange interactions. On the basis of the obtained results and analysis of referenced data, the local structure of the Cu2+ and Mn2+ centres in the borate glasses have been proposed.
Źródło:
Nukleonika; 2013, 58, 3; 379-385
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
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