Results 261 to 270 of about 439,357 (302)
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Heavy metal contamination in ion implantation
AIP Conference Proceedings, 1997Reduction of metallic contamination during ion implantation is becoming increasingly critical for device performance. Modern implanters are being developed with novel beamline coating materials and optics to keep sputtered contamination to a minimum. However chemical processes occur in the implanter which lead to contaminants being deposited onto the ...
Zhiyong Zhao +2 more
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Interaction of Heavy Metal Ions With Nanomaterials
2018Increasing water pollution due to heavy metals is a major global concern, and favorable remediation techniques are required. Heavy metal contamination affects both flora and fauna as it enters the food web. The development of nanotechnology and novel nanomaterials production has attracted researchers worldwide.
Suphiya Khan, Sonu Kumari
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Metal Oxide Composites for Heavy Metal Ions Removal
2021Contamination of heavy metals is a major concern nowadays due to various environmental problems and hazardous effects on human, living organisms and eco-system. It is therefore of paramount importance to devise strategies for heavy metal ions removal which are workable and economical before discharging the wastewater such as industrial wastewater into ...
Safoura Daneshfozoun +5 more
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Removal of heavy metal ions by nanofiltration
Desalination, 2013Abstract This study describes the rejection of heavy metal ions using a commercial nanofiltration membrane (NF270). The effect of feed pH, pressure and metal concentration on the metal rejections and permeate flux and in some cases permeate pH was explored.
B.A.M. Al-Rashdi, D.J. Johnson, N. Hilal
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The effective ion-ion interaction of heavy alkali metals
Solid State Communications, 1982Abstract The effective ion-ion interaction for the heavy alkali metals is calculated by a full non-local model potential, including exchange and correlation in the screening according to Vashishta and Singwi and in the RPA. The inclusion of the s - d hybridization effects merely following Harrison's theory for transition metals turns out to be ...
F. Bonsignori, A. Magnaterra
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Trace analysis of heavy metal ions by ion chromatography
Chromatographia, 1989An ion chromatographic separation technique for heavy metal ions is described. Using pressure-stable, silica-based, ion-exchange supports and standard HPLC equipment with post-column reaction detector high resolution is achieved as well as extremely high sensitivity in the parts per trillion (ppt)-range.
H. Bauer, Doris Ottenlinger, Daren Yan
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Combined Effects of Heavy Metal Ions on Bacteria and the Determination of Heavy Metals by Bioassay
Journal of Analytical Chemistry, 2004In the framework of the development of bioassay, a procedure was developed for studying the combined effects of heavy metal ions on bacteria. The bacterium Bacillus subtilis niger was proposed as an analytical indicator. A universal calculation system was developed that allows one to obtain and analyze functional models of toxicity and the combined ...
A. A. Tumanov, P. A. Krest'yaninov
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Biochemistry, 1982
Hemocyanins are oligomeric proteins that reversibly bind oxygen. The oxygen binding site is a binuclear copper center bound to the protein by amino acid side chains. The hemocyanin of the blue crab, Callinectes sapidus, occurs in vivo as a mixture of 25S dodecamers and 16S hexamers, whose oxygen binding properties are identical.
M, Brouwer +2 more
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Hemocyanins are oligomeric proteins that reversibly bind oxygen. The oxygen binding site is a binuclear copper center bound to the protein by amino acid side chains. The hemocyanin of the blue crab, Callinectes sapidus, occurs in vivo as a mixture of 25S dodecamers and 16S hexamers, whose oxygen binding properties are identical.
M, Brouwer +2 more
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Effect of light metal ions on the sorption of heavy metal ions on natural polymers
Journal of Applied Polymer Science, 1979Dried ground formaldehyde-treated peanut skins, white ash bark, and So. Wisconsin red maple bark are efficient substrates for removal of many heavy metal ions from waste streams, but possible interference by common light metal cations has never been determined. The influence of Ca2+, Mg2+, or Na+ on the removal of the heavy metal ions Pb2+, Cu2+, Cd2+,
Ray N. Young +2 more
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The Interaction of Heavy Metal Ions with DNA
1995The effect of metal ions upon conformation of DNA was realized early, when it became apparent that metal ions are involved in the stabilization of the Watson-Crick double helix1,2. Metal ions react with a variety of electron-donor sites on polynucleotides3. There are two main sites of interaction, the phosphate moieties of the ribose-phosphate backbone
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