نتایج جستجو برای: metals

تعداد نتایج: 63791  

2012
Ducu Sandu Stef Iosif Gergen

BACKGROUND The goal of our study was to evaluate the effects of different medicinal herbs rich in polyphenol (Lemon balm, Sage, St. John's wort and Small-flowered Willowherb) used as dietary supplements on bioaccumulation of some essential metals (Fe, Mn, Zn and Cu) in different chicken meats (liver, legs and breast). RESULTS In different type of chicken meats (liver, legs and breast) from ch...

Journal: :Toxicological sciences : an official journal of the Society of Toxicology 2006
John B Carey Ashley Allshire Frank N van Pelt

Immune modulation by heavy metals may cause serious adverse health effects in humans, although the mechanisms involved are not well understood. Both cadmium and lead are important environmental and occupational toxins. Therefore, in the current study, the costimulatory/adjuvant effects and the T-cell-activating potential of these metals (i.e., CdCl2 and PbCl2), are examined. These immune-modula...

2007
N. F. Mott

1-In a recent paper* certain properties of the transition metals Ni, Pd, and Pt and of their alloys with Cu, Ag, and Au have been discussed from the point of view of the electron theory of metals based on quantum mechanics. In particular, a qualitative explanation was given of the relatively high electrical resistance of the transition metals. It was shown from an examination of the experimenta...

Journal: :iranian journal of environmental sciences 0
gurumoorthi k faculty of marine sciences, annamalai university, parangipettai - 608 502, india venkatachalapathy r department of physics, annamalai university, annamalai nagar - 608 002, india

the concentration of selected trace metals (fe, cd, cu, pb, and zn) in 30surface sediments were measured using atomic absorption spectrometer to investigatethe spatial and seasonal variations of trace metals along kanyakumari coast, india. toassess the environmental risk of trace metals, enrichment factor, geo-accumulation index,pollution load index, and ecological risk index have been calculat...

2011
C. K. SHIVAKUMAR B. THIPPESWAMY M. KRISHNAPPA K. S. ANANTHAMURTHY

Heavy metals are categorized based on their high density, atomic weight, atomic number and molecular weight. Lewis acids property of metal ions results in covalent complex formation with different ligands in humans and other living forms which make metals nondegradable and cause toxicity (Duffus, 2002). Pulp and paper mill are categorized as one of the 12 most polluting industries in India whic...

2005
S. Korfali Samira Ibrahim Korfali Brian Davies E. Davies

Metals in bed-load sediments are multi-source, namely: weathered rocks, metals discharged directly into river, and eroded riparian soils. Contaminated flood plains represent storage system for releasing pollutants to rivers. An essential first step towards modeling this storage is to investigate the relationship. The objective of this study is compare the composition (CaCO3, Cd, Cr, Cu, Fe, Mn,...

2014
G. Arabaci

Heavy metals are one of the major groups of contaminants in the environment and many of them are toxic even at very low concentration in plants and animals. However, some metals play important roles in the biological function of many enzymes in living organisms. Metals such as zinc, iron, and cooper are important for survival and activity of enzymes in plants, however heavy metals can inhibit e...

Journal: :محیط زیست طبیعی 0
مریم زارع دانشجوی کارشناسی ارشد، گروه محیط زیست، دانشکده منابع طبیعی دانشگاه تهران، ایران امیرحسین حمیدیان استادیار گروه محیط زیست، دانشکده منابع طبیعی دانشگاه تهران، ایران هادی پورباقر استادیار گروه شیلات، دانشکده منابع طبیعی دانشگاه تهران، ایران سهراب اشرفی استادیار گروه محیط زیست، دانشکده منابع طبیعی دانشگاه تهران، ایران لیلا وزیری دانشجوی کارشناسی، گروه محیط زیست، دانشکده منابع طبیعی دانشگاه تهران، ایران

industrial activities lead to an increase in heavy metal burden in rivers. sediment and algae (spirogyra sp.) samples were collected from the shoor river to investigate their heavy metal concentrations. dry and ashed samples of algae and sediment were digested using concentrated nitric acid. heavy metals (as, fe, zn and cr) concentration measured using an icp-oes instrument (perkinelmer, usa). ...

2012
Ana-Maria Florea Dietrich Büsselberg David Carpenter

Metals are a part of our daily life. They are used for construction and for countless products (e.g., cars, mobile phones, or computers). Without the use of metals, human society would have not been developed to its current stage. While the raw materials are provided by our planet, humans learned to extract metals from mineral ore and to refine them. As a consequence to their wide use in the mo...

2001
James Barthel

Heavy metals contamination can be found at battery acid recycling sites, electroplating facilities, military installations, firing ranges, brownfields redevelopment sites, and associated with mining activities. The chemical stabilization process uses non-hazardous chemical binders that permanently stabilize heavy metals. The treated soils contain stable metalreagent compounds that eliminate the...

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