Thomas Sawidis - Academia.edu (original) (raw)
Papers by Thomas Sawidis
Global Journal Of Botanical Science, 2021
Manganese, nickel and zinc were determined in soils and 4 plants (2 cultivated: Brassica oleracea... more Manganese, nickel and zinc were determined in soils and 4 plants (2 cultivated: Brassica oleracea, Zea mays and 2 non cultivated: Rumex acetosa, Verbascum phlomoides) around the Coal Power Plant (CPP) - Agios Dimitrios, the largest CPP in Greece. In general, roots showed a higher metal content compared to the other over ground parts. This is more prominent in Brassica oleracea for all studied metals except zinc, where the highest zinc concentration is found in the sclerechyma (central vein) of the internal leaf. Thus, Brassica oleracea meets the objectives of phytoremediartion of lands contaminated by heavy metals. Periodically planting of Brassica oleracea could reduce the level of heavy metals in the area in order to clean up and prepare soils for other cultivations. The most contaminated leaves revealed a variation in epidermis roughness. In Verbascum phlomoides the multicellular, multilevel hairs on the leaf surface fixed a considerable number of air particles effectively. In co...
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Environmental Engineering and Management Journal, 2014
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Journal of Trace and Microprobe Techniques, 2003
The distribution of natural K, Ra and Ra and artificial Cs has been investigated in nonvascular m... more The distribution of natural K, Ra and Ra and artificial Cs has been investigated in nonvascular mosses (9 species) and lichens (10 species) and vascular gymnosperm (1 species), angiosperm trees and shrubs (3 species) over the Kozani-Ptolemaïda-Amynteon lignite basin in West Macedonia, Greece. Four lignite power plants producing about 70% of the electric energy of the country are to be found in this region. Both specific activity and transfer factors of these radionuclides have been determined by means of experiments. This study indicates that with regard to Ra and Cs, nonvascular lichens and mosses have a much higher transfer factor (2.27 for Ra and 43.77 Cs) compared with vascular plants (0.17 for Ra and 0.03 Cs), but a lower one for natural K (0.493 for lichens and mosses and respectively 1.190 for vascular plants). Compared with unpolluted areas (0.25 Bq/kg), the Ra specific activity in lichens and mosses was systematically higher (26.43 and 56.74 Bq/kg respectively).
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Environmental Pollution, 1988
Gamma-radioactivity of a wide variety of plant samples was measured. Measurements showed that rad... more Gamma-radioactivity of a wide variety of plant samples was measured. Measurements showed that radioactivity in plants depended on the area of surface exposed, the developmental season of the plants, and on the external morphology of their above-ground parts. Autoradiographs on several plants showed the presence of radioactivity in certain spots (hot spots) which were distributed randomly on the surface of the plants and differed in size and activity.
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Acta Biologica Cracoviensia Series Botanica, 2000
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International Journal of Environmental Research and Public Health
Concentrations of potentially toxic elements (PTEs) (Al, As, Cd, Cr, Cu, Ni, Pb, and Zn) were mea... more Concentrations of potentially toxic elements (PTEs) (Al, As, Cd, Cr, Cu, Ni, Pb, and Zn) were measured in topsoil samples collected from parks in the cities of Salzburg (Austria), Thessaloniki (Greece), and Belgrade (Serbia) in order to assess the distribution of PTEs in the urban environment, discriminate natural (lithogenic) and anthropogenic contributions, identify possible sources of pollution, and compare levels of pollution between the cities. An assessment of the health risks caused by exposure to PTEs through different pathways was also conducted. The study revealed that, with the exception of Pb in Salzburg, levels of PTEs in the soils in polluted urban parks were higher than in unpolluted ones, but still lower than those recorded in other European soils. Results of sequential analyses showed that Al, Cr, and Ni were found in residual phases, proving their predominantly lithogenic origin and their low mobility. In contrast, the influence of anthropogenic factors on Cu, Pb, ...
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Protoplasma, 1991
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Can J Bot, 1992
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Acta Agrobotanica, 2014
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Acta Agrobotanica, 2006
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Acta Agrobotanica, 2007
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Botanica Acta, 1991
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Pharmaceutical Biology, 2010
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Marine Environmental Research, 1986
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Journal of Environmental Management, 2005
The impact of human activities and environmental factors on the fluctuation of chemical and physi... more The impact of human activities and environmental factors on the fluctuation of chemical and physicochemical parameters along the Pinios River and its tributaries was studied. Their seasonal variations throughout the years 1996-1998 are also presented. Most of the parameters (physical or chemical) measured in this survey exhibited high spatial and temporal variability. High temperatures during the warm period, attributed both to meteorological conditions and to the geographical relief of Thessalia plain, cause a restriction of the water flow, an accumulation of organic matter and the depletion of the dissolved oxygen in the water. Conductivity and hardness are high during the warm and wet period for different reasons. At the seaward part of the river high conductivity and hardness values indicate extended admixture of seawater. COD values fluctuated seasonally. Among the studied stations along the Pinios River the most polluted was the area where the river has passed the city of Larissa.
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Current Opinion in Biotechnology, 2011
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Canadian Journal of Botany, 1992
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Biologia, 2011
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Biologia, 2008
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Journal of Plant Physiology, 1991
ABSTRACT
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Global Journal Of Botanical Science, 2021
Manganese, nickel and zinc were determined in soils and 4 plants (2 cultivated: Brassica oleracea... more Manganese, nickel and zinc were determined in soils and 4 plants (2 cultivated: Brassica oleracea, Zea mays and 2 non cultivated: Rumex acetosa, Verbascum phlomoides) around the Coal Power Plant (CPP) - Agios Dimitrios, the largest CPP in Greece. In general, roots showed a higher metal content compared to the other over ground parts. This is more prominent in Brassica oleracea for all studied metals except zinc, where the highest zinc concentration is found in the sclerechyma (central vein) of the internal leaf. Thus, Brassica oleracea meets the objectives of phytoremediartion of lands contaminated by heavy metals. Periodically planting of Brassica oleracea could reduce the level of heavy metals in the area in order to clean up and prepare soils for other cultivations. The most contaminated leaves revealed a variation in epidermis roughness. In Verbascum phlomoides the multicellular, multilevel hairs on the leaf surface fixed a considerable number of air particles effectively. In co...
Bookmarks Related papers MentionsView impact
Environmental Engineering and Management Journal, 2014
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Journal of Trace and Microprobe Techniques, 2003
The distribution of natural K, Ra and Ra and artificial Cs has been investigated in nonvascular m... more The distribution of natural K, Ra and Ra and artificial Cs has been investigated in nonvascular mosses (9 species) and lichens (10 species) and vascular gymnosperm (1 species), angiosperm trees and shrubs (3 species) over the Kozani-Ptolemaïda-Amynteon lignite basin in West Macedonia, Greece. Four lignite power plants producing about 70% of the electric energy of the country are to be found in this region. Both specific activity and transfer factors of these radionuclides have been determined by means of experiments. This study indicates that with regard to Ra and Cs, nonvascular lichens and mosses have a much higher transfer factor (2.27 for Ra and 43.77 Cs) compared with vascular plants (0.17 for Ra and 0.03 Cs), but a lower one for natural K (0.493 for lichens and mosses and respectively 1.190 for vascular plants). Compared with unpolluted areas (0.25 Bq/kg), the Ra specific activity in lichens and mosses was systematically higher (26.43 and 56.74 Bq/kg respectively).
Bookmarks Related papers MentionsView impact
Environmental Pollution, 1988
Gamma-radioactivity of a wide variety of plant samples was measured. Measurements showed that rad... more Gamma-radioactivity of a wide variety of plant samples was measured. Measurements showed that radioactivity in plants depended on the area of surface exposed, the developmental season of the plants, and on the external morphology of their above-ground parts. Autoradiographs on several plants showed the presence of radioactivity in certain spots (hot spots) which were distributed randomly on the surface of the plants and differed in size and activity.
Bookmarks Related papers MentionsView impact
Acta Biologica Cracoviensia Series Botanica, 2000
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International Journal of Environmental Research and Public Health
Concentrations of potentially toxic elements (PTEs) (Al, As, Cd, Cr, Cu, Ni, Pb, and Zn) were mea... more Concentrations of potentially toxic elements (PTEs) (Al, As, Cd, Cr, Cu, Ni, Pb, and Zn) were measured in topsoil samples collected from parks in the cities of Salzburg (Austria), Thessaloniki (Greece), and Belgrade (Serbia) in order to assess the distribution of PTEs in the urban environment, discriminate natural (lithogenic) and anthropogenic contributions, identify possible sources of pollution, and compare levels of pollution between the cities. An assessment of the health risks caused by exposure to PTEs through different pathways was also conducted. The study revealed that, with the exception of Pb in Salzburg, levels of PTEs in the soils in polluted urban parks were higher than in unpolluted ones, but still lower than those recorded in other European soils. Results of sequential analyses showed that Al, Cr, and Ni were found in residual phases, proving their predominantly lithogenic origin and their low mobility. In contrast, the influence of anthropogenic factors on Cu, Pb, ...
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Protoplasma, 1991
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Can J Bot, 1992
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Acta Agrobotanica, 2014
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Acta Agrobotanica, 2006
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Acta Agrobotanica, 2007
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Botanica Acta, 1991
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Pharmaceutical Biology, 2010
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Marine Environmental Research, 1986
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Journal of Environmental Management, 2005
The impact of human activities and environmental factors on the fluctuation of chemical and physi... more The impact of human activities and environmental factors on the fluctuation of chemical and physicochemical parameters along the Pinios River and its tributaries was studied. Their seasonal variations throughout the years 1996-1998 are also presented. Most of the parameters (physical or chemical) measured in this survey exhibited high spatial and temporal variability. High temperatures during the warm period, attributed both to meteorological conditions and to the geographical relief of Thessalia plain, cause a restriction of the water flow, an accumulation of organic matter and the depletion of the dissolved oxygen in the water. Conductivity and hardness are high during the warm and wet period for different reasons. At the seaward part of the river high conductivity and hardness values indicate extended admixture of seawater. COD values fluctuated seasonally. Among the studied stations along the Pinios River the most polluted was the area where the river has passed the city of Larissa.
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Current Opinion in Biotechnology, 2011
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Canadian Journal of Botany, 1992
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Biologia, 2011
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Biologia, 2008
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Journal of Plant Physiology, 1991
ABSTRACT
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