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  • Open Access
    Authors: 
    Kokkinofta, Rebecca I.; Petrakis, Panos V.; Mavromoustakos, Thomas M.; Theocharis, Charis R.; Kokkinofta, Rebecca I.; Petrakis, Panos V.; Mavromoustakos, Thomas M.; Theocharis, Charis R.;
    Publisher: American Chemical Society
    Countries: Cyprus, Greece

    Sixty-eight alcoholic beverages ranging in alcoholic degree between 40 and 55 from different countries were analyzed for their 16 most abundant metal elements using inductively coupled plasma (ICP) spectroscopy. The results were analyzed statistically using two different types of analytical methods: canonical discriminant analysis and classification binary trees. The aim of this study was to investigate which of the metals analyzed constitute diagnostic parameters that establish authenticity of the traditional Cypriot spirit zivania. The two statistical methods revealed that Mg, Zn, and Cu are promising distinctive parameters capable of differentiating zivania from other spirits similar in alcoholic degree. It is believed that this differentiation in metals between the alcoholic beverages examined is related to the unique geological and climatic conditions existing on the island of Cyprus. 51 21 6233 6239 Cited By :28

  • Open Access
    Authors: 
    Panagiotis Georgiadis; Soterios A. Kyrtopoulos;
    Publisher: Elsevier BV
    Country: Greece

    Direct epidemiological observations suggest that exposure to high levels of urban air pollution may result in increased risk of lung cancer, sufficient to account for a few (approximately 1-3) percent of total lung cancer incidence. Extrapolation from occupational exposure and risk data suggests that among potential carcinogens present in polluted urban air, polycyclic aromatic hydrocarbons (PAHs) may make a major contribution to air pollution-associated lung cancer risks. The use of biomarkers of genotoxocity in large-scale population studies may help to reduce the uncertainty involved in the assessment of such risks, especially those associated with relatively low pollution levels such as nowadays found in many Western cities. Increases in biomarkers of exposure to urban air PAHs as well as biomarkers of early effects have been detected in situations of relatively high levels of air pollution (e. g., ambient PAH concentrations of the order of a few tens of micrograms per cubic meter). Evidence has also been found about the modulation genetic damage accumulation in different individuals by polymorphisms in genes involved in the activation or detoxification of PAHs, especially of polymorphisms GSTM1 and CYP1A1 genes. However, the inconsistencies in the currently reported effects of genetic polymorphisms suggest that additional factors may also be important in the modulation of individual susceptibility to the accumulation of PAH-derived genetic damage. Biomarkers studies in populations exposed to relatively low ambient PAH concentrations (below 20 microg/m(3)) have not demonstrated clear dose-related effects (e.g., on DNA adduct levels), possibly because of the existence of multiple sources and routes of human exposure to PAHs in addition to inhalation of urban air (including, for example, home heating, environmental tobacco smoke and diet), and the consequent difficulty of adequately and specifically assessing atmospheric air-related exposure. This makes it imperative that molecular epidemiology studies be designed in such a way as to allow adequate assessment of exposure to urban air PAHs at the individual level and over short-, medium- and long-term time periods which correspond to the expression times of different biomarkers.

  • Open Access
    Authors: 
    A. Z. Devdariani; E. Chesnokov; A. L. Zagrebin; M. G. Lednev; Ioannis D. Petsalakis; Giannoula Theodorakopoulos; Heinz-Peter Liebermann; Robert J. Buenker;
    Publisher: Elsevier BV
    Country: Greece

    Abstract The asymptotically forbidden transitions Ar(3p61S0 ↔ 3p54s3P2) in the atmosphere of He gas atoms have been taken as a typical example to study the effect of input quantum chemical data variations on radiative characteristics of rare gas quasi-molecules. To this end the spectral profiles and total emission cross sections with and without averaging over Maxwell’s distribution have been calculated in a quasi-classical approach for different sets of the input quantum chemical data obtained in semi-empirical and RECP-MRDCI approaches. It has been demonstrated that the effect of the variations of quantum chemical data depends on which radiative characteristic is under consideration and on the region of interatomic distances. Thus, conclusions regarding the quality of the quantum chemical input data, based on comparisons with experimental results or the deduction of potential energy curves and/or radiative widths from experiments or fitting procedures, must be preceded by the study of the interatomic distance regions that are most important for a specific experiment.

Advanced search in
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arrow_drop_down
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3 Research products, page 1 of 1
  • Open Access
    Authors: 
    Kokkinofta, Rebecca I.; Petrakis, Panos V.; Mavromoustakos, Thomas M.; Theocharis, Charis R.; Kokkinofta, Rebecca I.; Petrakis, Panos V.; Mavromoustakos, Thomas M.; Theocharis, Charis R.;
    Publisher: American Chemical Society
    Countries: Cyprus, Greece

    Sixty-eight alcoholic beverages ranging in alcoholic degree between 40 and 55 from different countries were analyzed for their 16 most abundant metal elements using inductively coupled plasma (ICP) spectroscopy. The results were analyzed statistically using two different types of analytical methods: canonical discriminant analysis and classification binary trees. The aim of this study was to investigate which of the metals analyzed constitute diagnostic parameters that establish authenticity of the traditional Cypriot spirit zivania. The two statistical methods revealed that Mg, Zn, and Cu are promising distinctive parameters capable of differentiating zivania from other spirits similar in alcoholic degree. It is believed that this differentiation in metals between the alcoholic beverages examined is related to the unique geological and climatic conditions existing on the island of Cyprus. 51 21 6233 6239 Cited By :28

  • Open Access
    Authors: 
    Panagiotis Georgiadis; Soterios A. Kyrtopoulos;
    Publisher: Elsevier BV
    Country: Greece

    Direct epidemiological observations suggest that exposure to high levels of urban air pollution may result in increased risk of lung cancer, sufficient to account for a few (approximately 1-3) percent of total lung cancer incidence. Extrapolation from occupational exposure and risk data suggests that among potential carcinogens present in polluted urban air, polycyclic aromatic hydrocarbons (PAHs) may make a major contribution to air pollution-associated lung cancer risks. The use of biomarkers of genotoxocity in large-scale population studies may help to reduce the uncertainty involved in the assessment of such risks, especially those associated with relatively low pollution levels such as nowadays found in many Western cities. Increases in biomarkers of exposure to urban air PAHs as well as biomarkers of early effects have been detected in situations of relatively high levels of air pollution (e. g., ambient PAH concentrations of the order of a few tens of micrograms per cubic meter). Evidence has also been found about the modulation genetic damage accumulation in different individuals by polymorphisms in genes involved in the activation or detoxification of PAHs, especially of polymorphisms GSTM1 and CYP1A1 genes. However, the inconsistencies in the currently reported effects of genetic polymorphisms suggest that additional factors may also be important in the modulation of individual susceptibility to the accumulation of PAH-derived genetic damage. Biomarkers studies in populations exposed to relatively low ambient PAH concentrations (below 20 microg/m(3)) have not demonstrated clear dose-related effects (e.g., on DNA adduct levels), possibly because of the existence of multiple sources and routes of human exposure to PAHs in addition to inhalation of urban air (including, for example, home heating, environmental tobacco smoke and diet), and the consequent difficulty of adequately and specifically assessing atmospheric air-related exposure. This makes it imperative that molecular epidemiology studies be designed in such a way as to allow adequate assessment of exposure to urban air PAHs at the individual level and over short-, medium- and long-term time periods which correspond to the expression times of different biomarkers.

  • Open Access
    Authors: 
    A. Z. Devdariani; E. Chesnokov; A. L. Zagrebin; M. G. Lednev; Ioannis D. Petsalakis; Giannoula Theodorakopoulos; Heinz-Peter Liebermann; Robert J. Buenker;
    Publisher: Elsevier BV
    Country: Greece

    Abstract The asymptotically forbidden transitions Ar(3p61S0 ↔ 3p54s3P2) in the atmosphere of He gas atoms have been taken as a typical example to study the effect of input quantum chemical data variations on radiative characteristics of rare gas quasi-molecules. To this end the spectral profiles and total emission cross sections with and without averaging over Maxwell’s distribution have been calculated in a quasi-classical approach for different sets of the input quantum chemical data obtained in semi-empirical and RECP-MRDCI approaches. It has been demonstrated that the effect of the variations of quantum chemical data depends on which radiative characteristic is under consideration and on the region of interatomic distances. Thus, conclusions regarding the quality of the quantum chemical input data, based on comparisons with experimental results or the deduction of potential energy curves and/or radiative widths from experiments or fitting procedures, must be preceded by the study of the interatomic distance regions that are most important for a specific experiment.

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