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Recent News and Articles on the Keywords: 36,400 + web + 0.40  Related to the article below (Last Update: 8/5/2008)

Lane worries city faces $2B shortage on preserve
East Valley Tribune, AZ - Jul 19, 2008
... is beginning to simmer about whether city leaders are being open with the public about the potential cost to reach the goal of a 36400-acre preserve. ...
Source: Google News

[PDF] … Accumulation of Polychlorinated Biphenyl Congeners in the Terrestrial Food Web of the Kalamazoo … -
AL Blankenship, MJ Zwiernik, KK Coady, DP Kay, JL … - Environmental Science & Technology, 2005 - msu.edu
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Phenoxyl radicals: H-bonded and coordinated to Cu (ii) and Zn (ii) -
L Benisvy, E Bill, AJ Blake, D Collison, ES Davies … - Dalton Transactions, 2006 - rsc.org
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USG Survey - pubs.usgs.gov
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Round-Robin Test on methods for determining chloride transport parameters in concrete -
M Castellote, C Andrade - Materials and Structures, 2006 - Springer
... obtained through each method is also indicated in Table 2. The complete recipes
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[CITATION] Precision SUSY measurements with ATLAS for SUGRA points 1 and 2
E Richter-Was, D Froidevaux, J Soderqvist - ATLAS Internal Note, 1997

Magnetic and other properties of iron-aluminum alloys melted in vacuo -
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Removal of Metals from Contaminated Soils by Mineral Processing Techniques Followed by Chemical … -
G Mercier, J Duchesne, D Blackburn - Water, Air, & Soil Pollution, 2002 - Springer
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[PDF] The Use of SNOMED to Enhance Querying of a Clinical Data Warehouse
M Lieberman - A thesis presented to the Division of Medical Informatics …, 2003 - ohsu.edu
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[PDF] Upper White Watershed Sediment and Temperature Total Maximum Daily Load (Water Cleanup Plan) for …
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INTERPOLYMER COMPOSITIONS AND CAST STRETCH FILM THEREFROM -
DJJ Van, JA Degroot, P Jain, K Sehanobish, PS Chum - EP Patent 0,944,669, 2007 - freepatentsonline.com
... g/10 min and an I 10 /I 2 of less than 9.0; and wherein (a) Component A has a density
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-

Source: Google Scholar

New Design Of Semiconductor Membranes More Efficient Than Biological Membranes
A semiconductor membrane designed by researchers at the University of Illinois could offer more flexibility and better electrical performance than biological membranes. Built from thin silicon layers doped with different impurities, the solid-state membrane also could be used in applications such as single-molecule detection, protein filtering and DNA sequencing.

"By creating nanopores in the membrane, we can use the membrane to separate charged species or regulate the flow of charged molecules and ions, thereby mimicking the operation of biological ion channels," said lead researcher
Jean-Pierre Leburton, the Stillman Professor of Electrical and Computer Engineering at Illinois.

Leburton, with postdoctoral research associate Maria Gracheva and graduate student Julien Vidal, simulated the operation of the semiconductor membrane at a number of electrostatic potentials. They report their findings in a paper accepted for publication in the journal Nano Letters, and posted on the journal's Web site.

In the researchers' model, the nanopore-membrane structure is made of two layers of silicon, each 12 nanometers thick, with opposite (n- and p-) doping. The electrostatic potential is positive on the n-side and negative on the p-side of the membrane.

The nanopore has an hourglass shape, with a neck 1 nanometer in diameter and openings on each side of the membrane 6 nanometers in diameter. The 'size' of the nanopore can be changed by changing the electrostatic potential around it.

By controlling the flow of ions, the artificial nanopore offers a degree of tunability not found in biological ion channels, said Leburton, who also is a researcher at the university's Beckman Institute, the Coordinated Research Laboratory, and the Micro and Nanotechnology Laboratory.
In addition to serving as a substitute for biological ion channels, the solid-state nanopore and membrane could be used in other applications, including sequencing DNA.

"Using semiconductor technology to sequence the DNA molecule would save time and money," Leburton said. "By biasing the voltage across the membrane, we could pull DNA through the nanopore. Since each base pair carries a different electrical charge, we could use the membrane as a p-n junction to detect the changing electrical signal."

Funding was provided by the National Science Foundation and the National Institutes of Health.

Source: James E. Kloeppel
University of Illinois at Urbana-Champaign
 
 
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