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Post by aqt on Jan 6, 2010 9:58:40 GMT -5
One can define "intelligent" polymers as those polymers that respond with large property changes to small physical or chemical stimuli. These polymers may be in various forms, such as in solution, on surfaces, or as solids. One may also combine intelligent aqueous polymer systems with biomolecules to yield a large family of polymers that respond intelligently to physical, chemical, or biological stimuli. This article overviews such interesting and versatile polymer systems www.ncbi.nlm.nih.gov/pubmed/7625927
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Post by aqt on Jan 6, 2010 10:03:05 GMT -5
tiny.cc/Dx865Smart core/shell nanocomposites: Intelligent polymers modified gold nanoparticles
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Post by aqt on Jan 6, 2010 10:06:28 GMT -5
www.freepatentsonline.com/6893661.htmlAn extended release dosage composition of pharmaceutically active substances that have a water contact angle (è) such that cos è is between +0.9848 and −0.9848 presented as a matrix tablet containing the said pharmaceutically active substances, with/without suitable pharmaceutical excipients in intimate mixture with two groups of intelligent polymers having opposing wettability characteristics, one demonstrating a stronger tendency towards hydrophobicity and the other a stronger tendency towards hydrophilicity, the polymer combination being between the ratios of 1:50 and 50:1 amounts effective to control the release of said pharmaceutically active substances in a mathematically predictable manner, wherein the polymer demonstrating a stronger tendency towards hydrophobicity is not less than 5% wt/wt and preferably between 5-70% wt/wt of the final formulation composition. The intelligent polymers being ethylcellulose (EC) as a more strongly hydrophobic and hydroxyethylcellulose (HEC) and/or hydroxypropyl methylcellulose (HPMC) as more strongly hydrophilic (the ratio of HEC to HPMC being between 1:100 and 100:1). The matrix tablet is optionally coated with an enteric coat, 0-5%-15% wt/wt to prevent the initial burst effect seen in such systems and to impart gastrointestinal tract (GIT) “stealth” characteristics especially in the presence of food.
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Post by aqt on Jan 6, 2010 10:08:41 GMT -5
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Post by aqt on Jan 6, 2010 10:10:54 GMT -5
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Post by aqt on Jan 6, 2010 12:21:48 GMT -5
tiny.cc/zVbfTToward intelligent polymers: DNA sensors based on oligonucleotide-functionalized polypyrroles
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Post by aqt on Jan 6, 2010 12:23:16 GMT -5
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Post by aqt on Jan 6, 2010 13:10:24 GMT -5
Land warrior system The US Army has developed the Land Warrior system ... is designed to increase the ability of its fighters on the battlefield. Each soldier is connected to a wireless network, and relevant information about the battlefield is presented to the soldier on a helmet-mounted display. The system also montiors the vital signs of each soldier via sensors in their clothing, enabling field medics to identify immediately which troops need assistance, and even the type of wound that needs to be patched up. Extract from Ring, B. 2003, Techno fashion, The Sydney Morning Herald, Icon, March 1-2, p. 6. www.hsc.csu.edu.au/textiles_design/performance/2741/emerging.htm
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Post by aqt on Jan 6, 2010 13:15:28 GMT -5
A conjugated polymer can be considered as tri-dimensional network of intrinsically conducting macromolecular wires, able to transport signals. When further functionalized with prosthetic groups showing recognition properties, such polymer architecture mimics the nervous system existing in living beings. With this aim, we have developed a new type of electrochemical sensors, based on electroactive polypyrrole functionalized with oligonucleotide (ODN). At first, we analyzed the experimental conditions for building such modified electrode, showing a high electroactivity in aqueous medium. We developed a new route for the functionalization of polypyrrole, involving a precursor polypyrrole bearing an easy leaving ester group, on which an amino-labelled ODN can be directly substituted. The electrochemical response of this polypyrrole electrode functionalized with an ODN probe has then been analyzed in various aqueous media, containing either complementary or noncomplementary ODN targets. Results show that the cyclic voltammogram of ODN-functionalized polypyrrole is not modified when in presence of a noncomplementary ODN in solution. On the other hand, a significant modification of the voltammogram is observed upon addition of a complementary ODN target, to the electrolytic medium, which indicates that specific hybridization has occurred between the polypyrrole-grafted ODN probe and its complementary ODN target in solution. This biological recognition can be quantitatively determined by an amperometric analysis, and the limit of detection of this electrochemical biosensor is about 10-11mol, without any signal processing. These results confirm that functionalized polypyrroles act as macromolecular wires able to transduce biological information into molecular signals.cat.inist.fr/?aModele=afficheN&cpsidt=1755010
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Post by aqt on Jan 6, 2010 13:17:32 GMT -5
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Post by aqt on Jan 6, 2010 16:25:10 GMT -5
NANOSTRUCTURES Silicon Germanium nanostructures Konstantin Romanyuk, Vasily Cherepanov, Bert Voigtländer Self-assembled growth of semiconductor nano-structures is a bottom-up approach to build nano-structures with the help of nature. Recently, nano-wires have attracted a lot of interest because they are required to interconnect functional units in nano- and molecular electronics. We found a way of controlled fabrication of Si and Ge nanowires with a width down to 3 nm and a thickness of only one atomic layer (0.3 nm). www.fz-juelich.de/ibn/IBN3_Research_Subjects/
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Post by skyship on Jan 6, 2010 23:22:07 GMT -5
wow, thanks aqt, that virus you listed is both simian and human foamy virus.
si and Ge and biological interconnect....... or organ bio and organic chemistry
vs organicbio and inorganic chemistry.
skyship
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