Fumarolic alteration products at Sousaki (Greece): occurrence and environmental impact
© Aristotle University of Thessaloniki (6/2009)
Fumarolic alteration crusts and efflorescences have been sampled at the Sousaki solfataric field. Samples have been analysed for mineralogical (XRD) and chemical composition (HNO3 digestion and leaching with distilled water). Results show that mineralogical and chemical compositions (major, minor and trace metals) are controlled by microenvironmental conditions.

Effects of multiple stressors exposures on plant populations
© Aristotle University of Thessaloniki (6/2009)
The results of long-term field studies in the Bryansk region of Russia affected by the Chernobyl accident, and in the Semipalatinsk Test Site, Kazakhstan are discussed. Findings obtained clearly indicate that chronic low dose exposure appears to be an ecological factor creating preconditions for possible changes in the genetic structure of a population. Plant populations growing in areas with relatively low levels of pollution are characterized by the increased level of both cytogenetic disturbances and genetic diversity. Under conditions of chronic exposure in pine tree populations were developed seed descendants with significantly lower reproductive ability than in the reference population.

Effects of Alluminum soil content, on earthworm’s bioaccumulation on organic fields
© Aristotle University of Thessaloniki (6/2009)
The earthworm (Lumbricidae family) can be used in many ecotoxicological tests as a bio indicator and as a soil index in organic agriculture. Earthworms show the greatest rate of metals accumulation among all other species of terrestrial ecosystems. The main objective of our study was to study the accumulation of alluminum in the tissues of the earthworms from organic fields.

Metal bound to sediments bioavailability and sediment toxicity assessment using Arenicola marina in a field survey
© Aristotle University of Thessaloniki (6/2009)
In this research work, toxicity and bioavailability of metals Zn, Ni, Pb, Cd, Cu, Co and Hg bound to sediments from two sites (Guad1 and Guad2) of Guadalete River Estuary (SW Spain) were evaluated. Sediment physico-chemical characterization was undertaken and mortality and metal accumulation were determined in the species Arenicola marina after a 14 days in situ exposure in benthic cages.

Sediment quality in Guadalquivir River (SW, Spain) using four different short term toxicity tests
© Aristotle University of Thessaloniki (6/2009)
Sediments are significant in studies of pollution in aquatic environments and are known to transport different contaminants. They also serve as a sink or source to the water column of some contaminants. For a better assessment of the pollution in marine and freshwater environments, it has been proposed by several authors determinations based on chemical measurements together with laboratory toxicity tests.

Protection against Mg2+, Cu2+ and Zn2+ toxicity through siderophore in Frankia strains nodulating Hippöphae salicifolia D. Don
© Aristotle University of Thessaloniki (6/2009)
To study the role of siderophore in protecting the frankial strains from metal toxicity, Frankia strains were grown in presence of Mg2+, Cu2+ and Zn2+. Growth was observed up to (500 uM) Mg2+, (10 uM) Cu2+ and (10 uM) Zn2+ and maximum at 200 uM Mg2+, 1 uM Cu2+ and 1 uM Zn2+.

Comparison of the effect of heavy metals on the pedofauna of forest and meadow stands
© Aristotle University of Thessaloniki (6/2009)
In order to examine the soil contamination by heavy metals and to estimate its influence on the pedofauna, two forest stands and two meadow stands (located in the vicinity of woody areas) have been chosen. The content of Cd, Ni, Pb, Cu, and Zn in the soil of the stands was investigated using an atomic absorption spectrophotometer. Some environmental parameters were also analyzed, such as temperature, humidity and soil pH. The soil samples were neutral or slightly alkaline. The content of all heavy metals was smaller in the soil of the forest park. Cd and Pb content in the meadow and forest soil of the protected landscape park was high. It was found that in the forest park the density of pedofauna was higher than in the meadow and forest of the protected landscape park.

Effect of petroleum-derived substances on plants after application of compost, bentonite and calcium oxide
© Aristotle University of Thessaloniki (6/2009)
The aim of the study was to determine the effect of petrol and diesel oil soil contamination on the yield and content of some macroelements in spring barley (Hordeum vulgare L.), and investigate if soil amendment with of compost, bentonite and calcium oxide could reduce the impact of petroleum-derived products on the plants.

Content of macroelements in Avena sativa L., Brassica napus var. oleifera and Lupinus luteus L. after contamination of soil by copper and zinc
© Aristotle University of Thessaloniki (6/2009)
The aim of the study was to determine the effect of copper and zinc contamination on macroelements content in plants. Research was located on two alkaline soils which in natural conditions were formed with loamy sand and sandy loam. The soil was contaminated with copper (Cu) and zinc (Zn) at the following rates: 0, 150 and 450 mg/kg of soil.

Impact of nuclear energy objects on lake environment: Lake Druksiai case
© Aristotle University of Thessaloniki (6/2009)
The impact of a nuclear power plant on the environment consists basically of the thermal load,radioactive and chemical waste produced during its operation. Lake Druksiai – the cooling basin of the only Nuclear Power Plant in Lithuania (INPP) has been exposed to severe anthropogenic pressures since 1984 when the first unit (out of two) was put into operation.

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