Dibutyl-Disulfide Montmorillonite (DD-MMT) was synthesized successfully and found to bean excellent adsorbent for Hg(II) removal. The fourier transform infrared spectroscopy (FTIR),x-ray diffraction spectrum (XRD) and scanning electron microscopy (SEM) were used tocharacterize properties of the absorbent. The effects of several parameters such as solutionpH, adsorbent dose, contact time and the...

1 Institute of Soil Science and Land Evaluation, Univ. of Hohenheim, Emil-Wolff-Strasse 27, 70599 Stuttgart, Germany 2 Ludwig-Maximilians Univ., Dept. of Geography, Luisenstr. 37, 80333 Munich, Germany 3 Max-Planck-Institute for Biogeochemistry, Postfach 100164, 07701 Jena, Germany 4 Vegetation Ecology, Techn. Univ. of Munich, Am Hochanger 6, 85350 Freising, Germany 5 Helmholtz Center Munich, G...

Spatialized N budgets in a large agricultural Mediterranean watershed: high loading and low transfer L. Lassaletta, E. Romero, G. Billen, J. Garnier, H. Garcı́a-Gómez, and J. V. Rovira Environmental Pollution & Aquatic Ecosystem Research Group, Department of Ecology, Universidad Complutense de Madrid, c/ José Antonio Novais 28040 Madrid, Spain CNRS/UPMC, Sisyphe laboratory box 123, 4 place Jussi...

The usual procedures for ecological risk assessment (ERA) have been based for decades on simplified approaches in order to provide basic information on the huge amount of chemicals introduced into the environment. These approaches allowed the development of international regulatory tools capable of substantially reducing the adverse effects on ecosystems in developed countries. Nevertheless, th...

Exposure, as well as toxicity, determines whether rodenticides present real environmental hazards to nontarget animals. In order to combine exposure and toxicity, a compartment model is proposed which distinguishes transfer processes from accumulation of residues. The published literature relevant to the model is analysed, and some important gaps in knowledge are highlighted. Simple sub-models ...

The toxicity of Cu, Mn, Mo, Ni, V, As, Pb, Cr, Hg and Sn on the behaviour and survival of benthic worms Tubifex tubifex was studied. All tested metals were dissolved and determined in tap water under standardized conditions. The adverse effects of the metals were evaluated as acute toxicological effects upon exposure expressed as LC50 value with 95% confidence interval. On the basis of the LC50...

human granulocyte-colony stimulating factor (hg-csf) cdna was expressed in the methylotrophic yeast pichia pastoris under the control of the alcohol oxidase (aox1) promoter. an expression vector for hg-csf secretion was constructed using vector ppic9. higher levels of hg-csf was obtained using a p. pastoris mut+ (methanol utilization fast) phenotype. the effects of environmental factors such as...

this paper presents  the  levels  of total  mercury  (t-hg)  in  dorsal  muscle,  liver  and  spleen of pike  (esox lucius) from  anzali  lagoon  in iran.  sampling were  carried  out from  july  2004 to july 2005. in addition 78 samples were collected. t-hg concentration  were  calculated  in relation to biometric factors. t-hg was measured by the leco ama 254 advanced mercury analyzer (usa) a...