2015
Pawlyta, M.; Rouzaud, J. N.; Duber, S.
Raman microspectroscopy characterization of carbon blacks: Spectral analysis and structural information Journal Article
In: Carbon, vol. 84, no. 1, pp. 479-490, 2015, ISSN: 00086223, (278).
@article{2-s2.0-84922239254,
title = {Raman microspectroscopy characterization of carbon blacks: Spectral analysis and structural information},
author = { M. Pawlyta and J.N. Rouzaud and S. Duber},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84922239254&doi=10.1016%2fj.carbon.2014.12.030&partnerID=40&md5=3e3dbf60270e833a705016125cf4f594},
doi = {10.1016/j.carbon.2014.12.030},
issn = {00086223},
year = {2015},
date = {2015-01-01},
journal = {Carbon},
volume = {84},
number = {1},
pages = {479-490},
publisher = {Elsevier Ltd},
abstract = {The aim of this paper is to describe carbonisation and partial graphitization of carbon blacks (CB). Raman spectrometry is used to investigate a series of five CB grades during heat treatment (up to 2600 °C). Obtained results are discussed by comparing Raman data with X-ray diffraction and high-resolution transmission electron microscopy (HRTEM) observations. For Raman spectra interpretation, the usual curve fitting method proposed by Sadezky et al. for soot and disordered carbonaceous material is applied. As the same procedure can be applied over all the heat-treatment temperature range, the determination of band parameters from five band decompositions appears to be the most convenient to follow the CB's structural improvement. We demonstrate that only a partial graphitization takes place and the graphitizability is limited by the diameter of the primary particles. Our observations generalize the results obtained for cokes: graphitization degree of carbonaceous materials after the heat-treatment is limited by the diameter of the volumes within polyaromatic layers are oriented in parallel. © 2014 Elsevier Ltd. All rights reserved.},
note = {278},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The aim of this paper is to describe carbonisation and partial graphitization of carbon blacks (CB). Raman spectrometry is used to investigate a series of five CB grades during heat treatment (up to 2600 °C). Obtained results are discussed by comparing Raman data with X-ray diffraction and high-resolution transmission electron microscopy (HRTEM) observations. For Raman spectra interpretation, the usual curve fitting method proposed by Sadezky et al. for soot and disordered carbonaceous material is applied. As the same procedure can be applied over all the heat-treatment temperature range, the determination of band parameters from five band decompositions appears to be the most convenient to follow the CB's structural improvement. We demonstrate that only a partial graphitization takes place and the graphitizability is limited by the diameter of the primary particles. Our observations generalize the results obtained for cokes: graphitization degree of carbonaceous materials after the heat-treatment is limited by the diameter of the volumes within polyaromatic layers are oriented in parallel. © 2014 Elsevier Ltd. All rights reserved.
2009
Quirico, E.; Montagnac, G.; Rouzaud, J. N.; Bonal, L.; Bourot-Denise, M.; Duber, S.; Reynard, B.
Precursor and metamorphic condition effects on Raman spectra of poorly ordered carbonaceous matter in chondrites and coals Journal Article
In: Earth and Planetary Science Letters, vol. 287, no. 1-2, pp. 185-193, 2009, ISSN: 0012821X, (105).
@article{2-s2.0-70349385145,
title = {Precursor and metamorphic condition effects on Raman spectra of poorly ordered carbonaceous matter in chondrites and coals},
author = { E. Quirico and G. Montagnac and J.N. Rouzaud and L. Bonal and M. Bourot-Denise and S. Duber and B. Reynard},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-70349385145&doi=10.1016%2fj.epsl.2009.07.041&partnerID=40&md5=3da55b21edb79281c92b54d8736d3cce},
doi = {10.1016/j.epsl.2009.07.041},
issn = {0012821X},
year = {2009},
date = {2009-01-01},
journal = {Earth and Planetary Science Letters},
volume = {287},
number = {1-2},
pages = {185-193},
publisher = {Elsevier B.V.},
abstract = {Geothermometers based on Raman spectrometry of carbonaceous matter and covering a wide range of temperatures (100-650 °C) have been developed over recent years. While Raman data have been largely interpreted in terms of temperature, they are also the fingerprint of certain metamorphic conditions, especially in the low temperature range relevant to poorly ordered carbonaceous matter. This study investigates the Raman spectra of two series of chondritic carbonaceous matter and coal samples formed from different precursors and under different metamorphic conditions. The Raman spectra of Polyaromatic Carbonaceous Matter (PCM) from 42 chondrites and 27 coal samples, measured with visible (514 nm) and ultra-violet (244 nm) excitation wavelengths, are analyzed. The Raman spectra of low rank coals and chondrites of petrologic types 1 and 2, which contain the more disordered PCM, reflect the distinct carbon structures of their precursors. The 514 nm Raman spectra of high rank coals and chondrites of petrologic type 3 exhibit continuous and systematic spectral differences reflecting different carbon structures present during the metamorphism event. They result from differences in the chemical structures of the precursors concerning for instance the reticulation of polyaromatic units or an abundance of ether functional groups, or possibly from a lack of carbonization processes to efficiently expel oxygen heteroatoms, due to weak lithostatic pressure and confinement. These results suggest that the use of low temperature carbon thermometers should be restricted to a given geological context. At the same time, the sensitivity of Raman spectra to precursors and certain metamorphic conditions could be used to obtain information other than temperature. The analysis also provides evidence of the accretion of relatively homogeneous PCM precursors among ordinary CO and CV carbonaceous chondrite parent bodies, given that the 514 nm Raman spectra of PCM efficiently trace the metamorphism grades. Looking closer, however, the 514 nm Raman data are more scattered in chondrites than in coals and the maturity tracers are less sensitive and miscorrelate with the atomic H/C ratio, suggesting slight compositional and structural differences among the PCM precursors accreted. © 2009 Elsevier B.V. All rights reserved.},
note = {105},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Geothermometers based on Raman spectrometry of carbonaceous matter and covering a wide range of temperatures (100-650 °C) have been developed over recent years. While Raman data have been largely interpreted in terms of temperature, they are also the fingerprint of certain metamorphic conditions, especially in the low temperature range relevant to poorly ordered carbonaceous matter. This study investigates the Raman spectra of two series of chondritic carbonaceous matter and coal samples formed from different precursors and under different metamorphic conditions. The Raman spectra of Polyaromatic Carbonaceous Matter (PCM) from 42 chondrites and 27 coal samples, measured with visible (514 nm) and ultra-violet (244 nm) excitation wavelengths, are analyzed. The Raman spectra of low rank coals and chondrites of petrologic types 1 and 2, which contain the more disordered PCM, reflect the distinct carbon structures of their precursors. The 514 nm Raman spectra of high rank coals and chondrites of petrologic type 3 exhibit continuous and systematic spectral differences reflecting different carbon structures present during the metamorphism event. They result from differences in the chemical structures of the precursors concerning for instance the reticulation of polyaromatic units or an abundance of ether functional groups, or possibly from a lack of carbonization processes to efficiently expel oxygen heteroatoms, due to weak lithostatic pressure and confinement. These results suggest that the use of low temperature carbon thermometers should be restricted to a given geological context. At the same time, the sensitivity of Raman spectra to precursors and certain metamorphic conditions could be used to obtain information other than temperature. The analysis also provides evidence of the accretion of relatively homogeneous PCM precursors among ordinary CO and CV carbonaceous chondrite parent bodies, given that the 514 nm Raman spectra of PCM efficiently trace the metamorphism grades. Looking closer, however, the 514 nm Raman data are more scattered in chondrites than in coals and the maturity tracers are less sensitive and miscorrelate with the atomic H/C ratio, suggesting slight compositional and structural differences among the PCM precursors accreted. © 2009 Elsevier B.V. All rights reserved.
Smieja-Król, B.; Duber, S.; Rouzaud, J. N.
Multiscale organisation of organic matter associated with gold and uranium minerals in the Witwatersrand basin, South Africa Journal Article
In: International Journal of Coal Geology, vol. 78, no. 1, pp. 77-88, 2009, ISSN: 01665162, (20).
@article{2-s2.0-59649101053,
title = {Multiscale organisation of organic matter associated with gold and uranium minerals in the Witwatersrand basin, South Africa},
author = { B. Smieja-Król and S. Duber and J.N. Rouzaud},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-59649101053&doi=10.1016%2fj.coal.2008.09.007&partnerID=40&md5=ff220fc3eb6385aa8a3998a1ff52d200},
doi = {10.1016/j.coal.2008.09.007},
issn = {01665162},
year = {2009},
date = {2009-01-01},
journal = {International Journal of Coal Geology},
volume = {78},
number = {1},
pages = {77-88},
publisher = {Elsevier B.V.},
abstract = {Organic matter from the northern part of the Early Proterozoic Witwatersrand basin (Carbon Leader reef) was investigated using optical (OM) and transmission electron (TEM) microscopes, completed by XRD analysis. The multiscale organization (texture; microtexture; structure) of the organic matter was observed in order to gain information about the processes which affected organic material after its deposition in sediments. In the micrometre scale (optical microscope), the shape and size of the Reflectance Indicating Surface (RIS) of the organic matter were determined. The organic matter reveals a prevailing biaxial symmetry. The size of RIS is generally dependent on uranium and increases with increasing uranium concentration. Furthermore, it appears that more than one RIS is present within the scale of a single sample, each with a different symmetry and size. The presence of domains differing in organisation of the aromatic framework was confirmed by TEM observation in the DF mode. The aromatic skeleton of organic matter is composed of short, often crumpled, mostly isolated (non-stacked) polyaromatic layers whose fringe length corresponds to 3-16 aromatic rings. The data indicate reorganization of the polyaromatic organic matter structure under stress in high pressure and relatively low temperature conditions. The organic matter was in a solid state within the rocks before the pressure event. © 2008 Elsevier B.V. All rights reserved.},
note = {20},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Organic matter from the northern part of the Early Proterozoic Witwatersrand basin (Carbon Leader reef) was investigated using optical (OM) and transmission electron (TEM) microscopes, completed by XRD analysis. The multiscale organization (texture; microtexture; structure) of the organic matter was observed in order to gain information about the processes which affected organic material after its deposition in sediments. In the micrometre scale (optical microscope), the shape and size of the Reflectance Indicating Surface (RIS) of the organic matter were determined. The organic matter reveals a prevailing biaxial symmetry. The size of RIS is generally dependent on uranium and increases with increasing uranium concentration. Furthermore, it appears that more than one RIS is present within the scale of a single sample, each with a different symmetry and size. The presence of domains differing in organisation of the aromatic framework was confirmed by TEM observation in the DF mode. The aromatic skeleton of organic matter is composed of short, often crumpled, mostly isolated (non-stacked) polyaromatic layers whose fringe length corresponds to 3-16 aromatic rings. The data indicate reorganization of the polyaromatic organic matter structure under stress in high pressure and relatively low temperature conditions. The organic matter was in a solid state within the rocks before the pressure event. © 2008 Elsevier B.V. All rights reserved.
2002
Duber, S.; Rouzaud, J. N.; Clinard, C.; Pusz, S.
Microporosity and optical properties of some activated chars Journal Article
In: Fuel Processing Technology, vol. 77-78, pp. 221-227, 2002, ISSN: 03783820, (16).
@article{2-s2.0-0005801140,
title = {Microporosity and optical properties of some activated chars},
author = { S. Duber and J.N. Rouzaud and C. Clinard and S. Pusz},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0005801140&doi=10.1016%2fS0378-3820%2802%2900050-4&partnerID=40&md5=fd0e6eb9a9fa025fdd6e96b362206d9c},
doi = {10.1016/S0378-3820(02)00050-4},
issn = {03783820},
year = {2002},
date = {2002-01-01},
journal = {Fuel Processing Technology},
volume = {77-78},
pages = {221-227},
abstract = {The aim of this work was to understand the structural and microtextural changes responsible for microporosity formation in saccharose-based chars activated with CO2 at 850 °C. High-resolution transmission electron microscopy (HRTEM) and optical microscopy (reflectance measurements) allow to follow the changes in the chars organisation from nanometric to micrometric scales. Quantitative structural and microtextural data can now be extracted from the HRTEM images with an in-house image analysis procedure. Our results allow to suggest that the development of the microporosity with an increasing burn-off could be due to the development of slit-shaped pores. Such changes in pore shape and dimensions affect optical properties; a relationship was established between BET surface area and mean reflectance. By coupling these experimental data and a theoretical approach, a model of activated carbons is proposed to explain the reflectance changes during activation. © 2002 Elsevier Science B.V. All rights reserved.},
note = {16},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The aim of this work was to understand the structural and microtextural changes responsible for microporosity formation in saccharose-based chars activated with CO2 at 850 °C. High-resolution transmission electron microscopy (HRTEM) and optical microscopy (reflectance measurements) allow to follow the changes in the chars organisation from nanometric to micrometric scales. Quantitative structural and microtextural data can now be extracted from the HRTEM images with an in-house image analysis procedure. Our results allow to suggest that the development of the microporosity with an increasing burn-off could be due to the development of slit-shaped pores. Such changes in pore shape and dimensions affect optical properties; a relationship was established between BET surface area and mean reflectance. By coupling these experimental data and a theoretical approach, a model of activated carbons is proposed to explain the reflectance changes during activation. © 2002 Elsevier Science B.V. All rights reserved.
2000
Duber, S.; Pusz, S.; Kwiecińska, B.; Rouzaud, J. N.
On the optically biaxial character and heterogeneity of anthracites Journal Article
In: International Journal of Coal Geology, vol. 44, no. 3-4, pp. 227-250, 2000, ISSN: 01665162, (55).
@article{2-s2.0-0034283171,
title = {On the optically biaxial character and heterogeneity of anthracites},
author = { S. Duber and S. Pusz and B. Kwiecińska and J.N. Rouzaud},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0034283171&doi=10.1016%2fS0166-5162%2800%2900012-4&partnerID=40&md5=93fd6df68e7bc8e20d3c1553804ebe88},
doi = {10.1016/S0166-5162(00)00012-4},
issn = {01665162},
year = {2000},
date = {2000-01-01},
journal = {International Journal of Coal Geology},
volume = {44},
number = {3-4},
pages = {227-250},
abstract = {The results of the study of optical properties of 13 anthracites from different parts of the world are presented in this paper. Measurements of reflectance values were made on non-oriented vitrinite grains for a minimum of 300 points per sample. The reconstruction of Reflectance Indicating Surfaces (RIS) were made by Kilby's method [Kilby, W.E., 1988. Recognition of vitrinite with non-uniaxial negative reflectance characteristics. Int. J. Coal Geol. 9, 267-285; Kilby, W.E., 1991. Vitrinite reflectance measurement - some technique enhancements and relationships. Int. J. Coal Geol. 19, 201-218]. It was found that the use of Kilby's method for strongly anisotropic materials like anthracites did not give unambiguous results. Some improvement in Kilby's method, consisting of the division of the cumulative cross-plot into several elemental components, is suggested. Each elemental cross-plot corresponds to a textural class of anthracite, which is characterized by the values of RIS main axes R(MAX)((k)), R(INT)((k)) and R(MIN)((k)) (k = 1,2,... n; n - number of classes). The global texture of anthracite is characterized as a RIS with main axes calculated as the weighted means of R(MAX), R(INT) and R(MIN) for each class of this anthracite. The division of cumulative Kilby's cross-plot on elemental components makes possible the calculation of new coefficients H(t) and H10 characterizing the heterogeneity of the structure and texture of anthracites. The results of our study show that all anthracites have biaxial negative textures, but their heterogeneity varies in a wide range of H(t) and H10 coefficients depending upon the individual coal basin. (C) 2000 Elsevier Science B.V. All rights reserved.The results of the study of optical properties of 13 anthracites from different parts of the world are presented in this paper. Measurements of reflectance values were made on non-oriented vitrinite grains for a minimum of 300 points per sample. The reconstruction of Reflectance Indicating Surfaces (RIS) were made by Kilby's method. It was found that the use of Kilby's method for strongly anisotropic materials like anthracites did not give unambiguous results. Some improvement in Kilby's method, consisting of the division of the cumulative cross-plot into several elemental components, is suggested. Each elemental cross-plot corresponds to a textural class of anthracite, which is characterized by the values of RIS main axes RMAX(k), RINT(k) and RMIN(k) (k = 1,2, ... n; n - number of classes). The global texture of anthracite is characterized as a RIS with main axes calculated as the weighted means of RMAX̄, RINT̄ and RMIN̄ for each class of this anthracite. The division of cumulative Kilby's cross-plot on elemental components makes possible the calculation of new coefficients Ht and H10 characterizing the heterogeneity of the structure and texture of anthracites. The results of our study show that all anthracites have biaxial negative textures, but their heterogeneity varies in a wide range of Ht and H10 coefficients depending upon the individual coal basin.},
note = {55},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The results of the study of optical properties of 13 anthracites from different parts of the world are presented in this paper. Measurements of reflectance values were made on non-oriented vitrinite grains for a minimum of 300 points per sample. The reconstruction of Reflectance Indicating Surfaces (RIS) were made by Kilby's method [Kilby, W.E., 1988. Recognition of vitrinite with non-uniaxial negative reflectance characteristics. Int. J. Coal Geol. 9, 267-285; Kilby, W.E., 1991. Vitrinite reflectance measurement - some technique enhancements and relationships. Int. J. Coal Geol. 19, 201-218]. It was found that the use of Kilby's method for strongly anisotropic materials like anthracites did not give unambiguous results. Some improvement in Kilby's method, consisting of the division of the cumulative cross-plot into several elemental components, is suggested. Each elemental cross-plot corresponds to a textural class of anthracite, which is characterized by the values of RIS main axes R(MAX)((k)), R(INT)((k)) and R(MIN)((k)) (k = 1,2,... n; n - number of classes). The global texture of anthracite is characterized as a RIS with main axes calculated as the weighted means of R(MAX), R(INT) and R(MIN) for each class of this anthracite. The division of cumulative Kilby's cross-plot on elemental components makes possible the calculation of new coefficients H(t) and H10 characterizing the heterogeneity of the structure and texture of anthracites. The results of our study show that all anthracites have biaxial negative textures, but their heterogeneity varies in a wide range of H(t) and H10 coefficients depending upon the individual coal basin. (C) 2000 Elsevier Science B.V. All rights reserved.The results of the study of optical properties of 13 anthracites from different parts of the world are presented in this paper. Measurements of reflectance values were made on non-oriented vitrinite grains for a minimum of 300 points per sample. The reconstruction of Reflectance Indicating Surfaces (RIS) were made by Kilby's method. It was found that the use of Kilby's method for strongly anisotropic materials like anthracites did not give unambiguous results. Some improvement in Kilby's method, consisting of the division of the cumulative cross-plot into several elemental components, is suggested. Each elemental cross-plot corresponds to a textural class of anthracite, which is characterized by the values of RIS main axes RMAX(k), RINT(k) and RMIN(k) (k = 1,2, ... n; n - number of classes). The global texture of anthracite is characterized as a RIS with main axes calculated as the weighted means of RMAX̄, RINT̄ and RMIN̄ for each class of this anthracite. The division of cumulative Kilby's cross-plot on elemental components makes possible the calculation of new coefficients Ht and H10 characterizing the heterogeneity of the structure and texture of anthracites. The results of our study show that all anthracites have biaxial negative textures, but their heterogeneity varies in a wide range of Ht and H10 coefficients depending upon the individual coal basin.
1999
Duber, S.; Rouzaud, J. N.
Calculation of relectance values for two models of texture of carbon materials Journal Article
In: International Journal of Coal Geology, vol. 38, no. 3-4, pp. 333-348, 1999, ISSN: 01665162, (32).
@article{2-s2.0-0032712461,
title = {Calculation of relectance values for two models of texture of carbon materials},
author = { S. Duber and J.N. Rouzaud},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0032712461&doi=10.1016%2fS0166-5162%2898%2900037-8&partnerID=40&md5=2bd18796955cdc28d2544aad496ab357},
doi = {10.1016/S0166-5162(98)00037-8},
issn = {01665162},
year = {1999},
date = {1999-01-01},
journal = {International Journal of Coal Geology},
volume = {38},
number = {3-4},
pages = {333-348},
publisher = {Elsevier B.V.},
abstract = {This paper presents two models of texture of carbon materials possessing porosity. For both models, R(MAX), R(INT) and R(MIN) values of reflectance have been calculated by modified Ting's 3A method [Ting, F.T.C., 1978. Petrographic techniques in coal analysis. In: C. Karr (Ed.), Analytical Methods for Coal and Coal Products, Vol. 1. Academic Press, New York, 1978, pp. 3-25]. It has been found that the reflectance indicating surface (RIS) for the studied models of texture changes from a biaxial negative up to a biaxial positive one (the type A texture) depending on the shape and size of pores. In particular case, for the type B texture and the isometry of pores, a uniaxial negative RIS is merely obtained.},
note = {32},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
This paper presents two models of texture of carbon materials possessing porosity. For both models, R(MAX), R(INT) and R(MIN) values of reflectance have been calculated by modified Ting's 3A method [Ting, F.T.C., 1978. Petrographic techniques in coal analysis. In: C. Karr (Ed.), Analytical Methods for Coal and Coal Products, Vol. 1. Academic Press, New York, 1978, pp. 3-25]. It has been found that the reflectance indicating surface (RIS) for the studied models of texture changes from a biaxial negative up to a biaxial positive one (the type A texture) depending on the shape and size of pores. In particular case, for the type B texture and the isometry of pores, a uniaxial negative RIS is merely obtained.
1997
Butuzova, L. F.; Duber, S.; Matsenko, G. P.; Saranchuk, V. I.; Rouzaud, J. N.
The microtexture and microstructure of cokes prepared with calcium hydroxide additives Journal Article
In: Solid Fuel Chemistry, vol. 31, no. 4, pp. 23-33, 1997, ISSN: 03615219.
@article{2-s2.0-77949728412,
title = {The microtexture and microstructure of cokes prepared with calcium hydroxide additives},
author = { L.F. Butuzova and S. Duber and G.P. Matsenko and V.I. Saranchuk and J.N. Rouzaud},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-77949728412&partnerID=40&md5=1dc88bfad500d14e6df14b89db7ce3f6},
issn = {03615219},
year = {1997},
date = {1997-01-01},
journal = {Solid Fuel Chemistry},
volume = {31},
number = {4},
pages = {23-33},
abstract = {The influence of the chemical modification of coal on the structure, microstructure, and properties of coke is shown. The use of optical and X-ray structural methods of analysis made it possible to determine the action of a calcium hydroxide additive on the structure of samples. It was found that in the presence of an additive, the total content of lamellas, the content of flat ones (transmission electron microscopy), and the amount of a fluid domain texture (optical microscopy) increase together with an increase in the thickness of the pore walls in the relevant cokes. © 1997 by Allerton Press, Inc.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The influence of the chemical modification of coal on the structure, microstructure, and properties of coke is shown. The use of optical and X-ray structural methods of analysis made it possible to determine the action of a calcium hydroxide additive on the structure of samples. It was found that in the presence of an additive, the total content of lamellas, the content of flat ones (transmission electron microscopy), and the amount of a fluid domain texture (optical microscopy) increase together with an increase in the thickness of the pore walls in the relevant cokes. © 1997 by Allerton Press, Inc.
1996
Łaszczyca, P.; Kawka-Serwecińska, E.; Witas, I.; Doleżych, B.; Falkus, B.; Mekail, A.; Ziółkowska, B.; Madej, P.; Migula, P.
Lipid peroxidation and activity of antioxidative enzymes in the rat model of ozone therapy. Journal Article
In: Materia medica Polona. Polish journal of medicine and pharmacy, vol. 28, no. 4, pp. 155-160, 1996, ISSN: 00255246, (8).
@article{2-s2.0-0030252327,
title = {Lipid peroxidation and activity of antioxidative enzymes in the rat model of ozone therapy.},
author = { P. Łaszczyca and E. Kawka-Serwecińska and I. Witas and B. Doleżych and B. Falkus and A. Mekail and B. Ziółkowska and P. Madej and P. Migula},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0030252327&partnerID=40&md5=f6a9c197867425e982bec688275688d5},
issn = {00255246},
year = {1996},
date = {1996-01-01},
journal = {Materia medica Polona. Polish journal of medicine and pharmacy},
volume = {28},
number = {4},
pages = {155-160},
abstract = {Hypothetical, therapeutic effects of ozone were investigated in an animal model. One ml of oxygen or mixture of 40 micrograms ozone with oxygen were injected intraperitoneally to male rats for 10 days. Previously, rats had been poisoned with 50 ppm Cd2+ in drinking water for 12 weeks. Exhaustive treadmill running was applied to some animals before sacrification. Ozone injections increased iron-ascorbate-stimulated lipid peroxidation (LPO) in the liver and kidney, catalase (CAT) activity in the heart and glutathione S-transferase (GST) activity in the heart, kidney and liver. Oxygen increased GST activity in the brain and reduced glutathione peroxidase (GPX) activity in the kidney. Cadmium enhanced LPO in the liver and GST activity in the brain, heart, kidney and liver. In contrast to ozone, cadmium inhibited GPX activity in the brain, kidney and liver. Cadmium combined with ozone enhanced the changes of GPX activity in the kidney and liver, that of GST activity in the heart, kidney and liver as well as of CAT activity and LPO in kidney. The results suggest that ozone injections combined with tested factors may provoke an oxidative stress. The effects of ozone therapy can not be explained as the results of ozone action on the antioxidative enzymes in rat.},
note = {8},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Hypothetical, therapeutic effects of ozone were investigated in an animal model. One ml of oxygen or mixture of 40 micrograms ozone with oxygen were injected intraperitoneally to male rats for 10 days. Previously, rats had been poisoned with 50 ppm Cd2+ in drinking water for 12 weeks. Exhaustive treadmill running was applied to some animals before sacrification. Ozone injections increased iron-ascorbate-stimulated lipid peroxidation (LPO) in the liver and kidney, catalase (CAT) activity in the heart and glutathione S-transferase (GST) activity in the heart, kidney and liver. Oxygen increased GST activity in the brain and reduced glutathione peroxidase (GPX) activity in the kidney. Cadmium enhanced LPO in the liver and GST activity in the brain, heart, kidney and liver. In contrast to ozone, cadmium inhibited GPX activity in the brain, kidney and liver. Cadmium combined with ozone enhanced the changes of GPX activity in the kidney and liver, that of GST activity in the heart, kidney and liver as well as of CAT activity and LPO in kidney. The results suggest that ozone injections combined with tested factors may provoke an oxidative stress. The effects of ozone therapy can not be explained as the results of ozone action on the antioxidative enzymes in rat.
1995
Łaszczyca, P.; Kawka-Serwecińska, E.; Witas, I.; Doleżych, B.; Migula, P.
Iron ascorbate-stimulated lipid peroxidation in vitro. Why is the method controversial? Journal Article
In: General Physiology and Biophysics, vol. 14, no. 1, pp. 3-18, 1995, ISSN: 02315882, (5).
@article{2-s2.0-0029014509,
title = {Iron ascorbate-stimulated lipid peroxidation in vitro. Why is the method controversial?},
author = { P. Łaszczyca and E. Kawka-Serwecińska and I. Witas and B. Doleżych and P. Migula},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0029014509&partnerID=40&md5=cae792886345504ee1224eda707729d2},
issn = {02315882},
year = {1995},
date = {1995-01-01},
journal = {General Physiology and Biophysics},
volume = {14},
number = {1},
pages = {3-18},
abstract = {In vitro generation of thiobarbituric acid reactive substances (TBARS) is frequently used to assess organ susceptibility to lipid peroxidation. The yield of TBARS is severalfold enhanced by an addition of iron ions with reductors or chelators such as ascorbate, NADPH, ADP or pyrophosphate. The process cannot be interpreted in a simple way, since it involves several enzymatic and nonenzymatic reactions. There are no clear interpretations of the ambiguous effects of denaturating factors and chelating agents on TBARS generation. Also controversy arises from the cirvilinear relationship between the homogenate concentration and the yield of TBARS. This has been modelled in the present work by combining two functions describing the sequential reaction with two limiting steps. One of them is related to catalytic action of iron and ascorbate, while the other to an enzyme, possibly phospholipase A2, as has been suggested by some investigators. Two models should be considered since it is impossible to decide which kinetic equation should predominate in the model. Nevertheless, the model reflects kinetic properties of the process. The effects of catalyst concentration and some other modification upon the yield of TBARS were also investigated experimentally. The results of experiments and modelling showed that the analytical procedures used by investigators need standardisation as the results obtained under a variety of procedures may reflect quite different properties of the living systems.},
note = {5},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
In vitro generation of thiobarbituric acid reactive substances (TBARS) is frequently used to assess organ susceptibility to lipid peroxidation. The yield of TBARS is severalfold enhanced by an addition of iron ions with reductors or chelators such as ascorbate, NADPH, ADP or pyrophosphate. The process cannot be interpreted in a simple way, since it involves several enzymatic and nonenzymatic reactions. There are no clear interpretations of the ambiguous effects of denaturating factors and chelating agents on TBARS generation. Also controversy arises from the cirvilinear relationship between the homogenate concentration and the yield of TBARS. This has been modelled in the present work by combining two functions describing the sequential reaction with two limiting steps. One of them is related to catalytic action of iron and ascorbate, while the other to an enzyme, possibly phospholipase A2, as has been suggested by some investigators. Two models should be considered since it is impossible to decide which kinetic equation should predominate in the model. Nevertheless, the model reflects kinetic properties of the process. The effects of catalyst concentration and some other modification upon the yield of TBARS were also investigated experimentally. The results of experiments and modelling showed that the analytical procedures used by investigators need standardisation as the results obtained under a variety of procedures may reflect quite different properties of the living systems.