Scientific Research Publishing

Read  full  paper  at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=53695#.VM85jizQrzE Author(s)   Yovana Todorova * , Ivaylo Yotinov , Stilyana Lincheva , Yana Topalova Affiliation(s) Department of General and Applied Hydrobiology, Faculty of Biology, Sofia University “St. Kliment Ohridski”, Sofia, Bulgaria . ABSTRACT As mediators in key biotransformation processes, the complex enzyme activities (measured as a total of extracellular and intracellular activity on sub- organism, organism and supra-organism level) have a high potential to be used as reliable indicators for risk identification in co-contaminated sediments with organics and heavy metals. Two enzyme activities—dehydrogenase activity (TTC-DHA) and phosphatase activity index (PAI) were measured by use of methods with tetrazolium chloride and p-nitrophenyl phosphate in polluted sediments of Middle Iskar River part, Bulgaria. The environmental state of river sector...

Read  full  paper  at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=53374#.VMBoJCzQrzE Author(s)    Angelo Paone 1,2   Affiliation(s) 1 United States Geological Survay, Reston, USA . 2 Dipartimento di Scienze della Terra, Università degli Studi di Napoli “Federico II”, Naples, Italy . ABSTRACT A broad set of samples from the CVP has been analyzing Pb isotopes. Campanian Volcanic Province (CVP) has been produced by various ranges of mixing between three components: 1) MORB, 2) Hercynian basement and 3) upper crust. Anyhow, the upper crust that has modified the Pb isotopic composition also shows trends towards an Achaean upper crust. This is consistent for all Mediterranean area. This is not in contrast with the past plate tectonic reconstruction. Also the surface sediments (GLOSS) may have been a mixing between the Achaean upper crust and a Hercynian component with an implication worldwide due to the rock cycle pro...

Read full paper at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=52290#.VI-VFMnQrzE Author(s)   Mohamed A. Shreadah 1* , Safaa A. Abdel Ghani 1 , Hamada B. I. Hawash 1 , Asia Abd El Samie 2 , Abd El Moniem M. Ahmed 2 Affiliation(s) 1 National Institute of Oceanography and Fisheries, Alexandria, Egypt . 2 Chemistry Department, Faculty of Science, Alexandria University, Alexandria, Egypt . ABSTRACT This pioneered study is aimed to determine the levels and distributions of organotin compounds (OTCs) in sediment samples collected from five Egyptian lakes located in the southern-eastern Mediterranean Sea. The paper has given an account of and the reasons for the widespread distribution of Tributyl...