Environmental Impacts of Released Polybrominated Diphenyl Ethers
© Aristotle University of Thessaloniki (6/2009)
In the past several years, polybrominated diphenyl ethers, commonly used in flame retardants, have become widespread environmental pollutants, and have been detected in water, soil, air, animals and human tissues. Exposure occurs in particular through the diet and the indoor environment.

Molecular analysis on the lipid A (endotoxin) biosynthesis of aerosolized Pseudomonas spp. (y-Proteobacteria) isolated from different workplaces
© Aristotle University of Thessaloniki (6/2009)
Lipopolysaccharide (LPS) is an essential component of the outer membrane in most Gram-negative bacteria. LPS consists of the lipid A moiety linked to a short-core oligosaccharide and the distal Oantigen polysaccharide chain. The most biologically active component of LPS is lipid A (or endotoxin), a strong activator of monocytes to release immune stimulators such as proinflammatory cytokines. LPS and lipid A can be present on the bioaerosol at different workplaces causing different endotoxic diseases.

The degradation of Terbuthylazine and Chlorpyrifos in various biomix substrates based on composted cotton crop residues
© Aristotle University of Thessaloniki (6/2009)
The degradation of terbuthylazine (TA) and chlorpyrifos (CP) were investigated in biomix substrates with the potential to be used in pilot biobed systems. These biomix substrates were originated from residues of cotton cultivation, which is the most important crop in the Thessaly plain, thus being of high regional interest. Terbuthylazine was more persistent when applied in soil, compared to its degradation in soil-compost biomixture which was markedly faster. On the other hand, a more rapid degradation of CP and formation of trichloropyridinyl (TCP), the main metabolite of CP, were evident in the soil compared to the compost-amended biomix.

Macronutrient and heavy metal accumulation in a Greek fir ecosystem of Taygetos mountain in Peloponnese
© Aristotle University of Thessaloniki (6/2009)
Macronutrient and heavy metals accumulation in the forest floor and soil were investigated in three undisturbed natural forest sites of Greek fir ecosystem of Taygetos mountain in Peloponnese. Dry weight and organic matter of the forest floor ranged greatly, from a high of about 67 and 57 t/ha under to a low of 27 and 14 t/ha respectively.

Environmental economics of advanced regeneration methods of mineral oil using synthetic adsorbents
© Aristotle University of Thessaloniki (6/2009)
Mineral transformer oils are characterized by the European Waste Catalogue 2002 (EWC 2002) and marked with code 13 03 07. Usage of these oils as energy sources and their incineration are strictly forbidden while their transportation and storage is legislated. In addition to their complicated handling procedures, their price is steeply raising in line with recent changes in market crude oil prices.

Environmental fate and persistence of the organophosphorus pesticide disulfoton in different types of natural water
© Aristotle University of Thessaloniki (6/2009)
Degradation kinetics of hydrolysis and photolysis pathways of the organophosphorus pesticide disulfoton (O,O-diethyl S-[2-(ethylthio)ethyl] phosphorodithioate) in several types of natural water were investigated. Not degraded quantity of the compound was determined by GC-NPD means.

Investigation on the behavior of pesticides in atmosphere
© Aristotle University of Thessaloniki (6/2009)
This paper shows an analytical approach based on GC analysis for evaluating the pesticide trend in atmosphere: in particular, the pesticides investigated are dimethoate, carbaryl, phorate, cypermethrin, chloridazon, phenmedipham and fluazifop-p-butyl. For the analytical methodology a linearity response was obtained (r2= 0.9995) in GC-NPD whereas the limits of detection are 0.001 ng μL-1 in GC-NPD with a Relative Standard Deviation below 9.5%. Finally, this approach has been succefully applied to real samples.

Composition and distribution of organochlorine pollutants in the sediments and mussels from the Istanbul Strait (Turkey)
© Aristotle University of Thessaloniki (6/2009)
Organochlorine pollutants are ubiquitous and persistent anthropogenic contaminants in the aquatic environment. Since these compounds have an affinity for particulate matter, they can accumulate in sediments and due to their lipophilic nature they tend to accumulate also in organisms. In this study, sediment and mussel samples from the stanbul Strait were analyzed for indicator and 12 dioxin-like polychlorinated biphenyls (PCBs), 17 dioxins/furans congeners and for organochlorine pesticides (OCs).

Regional differences in trace element concentrations in Anadara spp. Mollusca: Bivalva) collected from the coast of South Vietnam
© Aristotle University of Thessaloniki (6/2009)
We measured accumulation of 21 trace elements in blood cockles, Anadara spp., collected from the South Key Economic Zone, Mekong River Delta (MRD), and Central Coastal Zone (CCZ) in Vietnam. Concentrations of As, Sr, Mo, Sn and Pb were higher in CCZ blood cockle than in those from the other two regions, whereas Hg concentration was elevated in MRD samples.

Application of computer modelling for forecasting of contaminants distribution in soil
© Aristotle University of Thessaloniki (6/2009)
An outlook of various methods of computer modeling application for the analysis and forecasting of contaminants migration in the soil is being discussed. A new mathematical model of contaminants transport in near-surface soil layer under non-isothermal conditions is being proposed. The given model takes into account the soil moisture content change effecting the solute transport and sorption owing to evaporation processes and recondensation of water vapor. The article also covers the possibility of hybrid expert systems (HES) application for solving contaminants migration in the soil. Distinguish structure of HES that includes models hybridization is being proposed. On the basis of given methods and models a new software has been developed.

<  1  2  3  4  5 . . . . >
Username:

Password:

 Keep me signed in

Forgot your password?