01274nas a2200157   4500008004100000022001400041245013100055210006900186260007100255300001600326490000700342520058600349100002400935700003000959856012700989       2009                        eng d  a0743-746300aIntracellular biogenic silver nanoparticles for the generation of carbon supported antiviral and sustained bactericidal agents0 aIntracellular biogenic silver nanoparticles for the generation o  a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcOCT  a11741-117470 v253 a<p>Intracellular silver nanoparticles produced by exposing silver ions to the fungus Aspergillus ochraceus were heat-treated in nitrogen environment to yield silver nanoparticles embedded in carbonaceous supports. This carbonaceous matrix embedded silver nanoparticles showed antimicrobial properties against both bacteria (Gram-positive and Gram-negative) and virus (M 13 phage virus). The bactericidal effects were noticed even after washing and repealed exposure of these carbon supported silver nanoparticles to fresh bacterial Cultures, revealing their sustained activity.</p>1 aVijayakumar, P., S.1 aPrasad, Bhagavatula L. V.  uhttps://library.ncl.res.in/content/intracellular-biogenic-silver-nanoparticles-generation-carbon-supported-antiviral-and-002023nas a2200181   4500008004100000022001400041245013600055210006900191260007100260300001400331490000700345520126200352100002001614700002401634700003001658700002201688856013101710       2010                        eng d  a0743-746300aSynthesis and characterization of poly-L-lysine-grafted silica nanoparticles synthesized via NCA polymerization and click chemistry0 aSynthesis and characterization of polyLlysinegrafted silica nano  a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcAPR  a5772-57810 v263 a<p>Polypeptide polymer-grafted silica nanoparticles are of considerable interest because the ordered secondary structure of the polypeptide grafts imparts novel functional properties onto the nanoparticle composite. The synthesis of poly-L-lysine-grafted nanoparticles would be of particular interest because the high density of cationic charges on the surface could lead to many applications such as gene delivery and antimicrobial agents. In this work, we have developed a ``grafting-to'' approach using a combination of NCA polymerization and ``click chemistry'' to synthesize poly-L-lysine-grafted silica nanoparticles with a high graft density of 1 chain/nm(2). The covalent attachment of poly-L-lysine to silica nanoparticles (PLL-silica) was confirmed using a variety of techniques such as C-13 CP MAS NMR, TGA, and IR. This methodology was then extended to graft poly-L-lysine-b-poly-L-leucine copolymer (PLL-b-PLLeu-silica) and poly-L-benzylglutamate (PLUG silica) onto silica nanoparticles. All of these polypeptide-grafted nanoparticles show interesting aggregation properties in solution. The efficacy of PLL-silica and PLL-h-PLLeu-silica as antimicrobial agents was tested on both gram-negative B. cull and grain-positive Bacillus subtilis.</p>1 aKar, Mrityunjov1 aVijayakumar, P., S.1 aPrasad, Bhagavatula L. V.1 aGupta, Sayam, Sen  uhttps://library.ncl.res.in/content/synthesis-and-characterization-poly-l-lysine-grafted-silica-nanoparticles-synthesized-nca-002140nas a2200253   4500008004100000022001400041245010600055210006900161260009500230300001200325490000700337520118100344653002901525653001701554653002901571653001801600653002201618100002401640700001901664700002701683700001801710700003001728856012801758       2010                        eng d  a1533-488000aVice to virtue: intracellular biogenic nanoparticles for the generation of carbon supported catalysts0 aVice to virtue intracellular biogenic nanoparticles for the gene  a25650 NORTH LEWIS WAY, STEVENSON RANCH, CA 91381-1439 USAbAMER SCIENTIFIC PUBLISHERScFEB  a905-9110 v103 a<p>Intracellular biogenic nanoparticles are considered disadvantageous as the separation of the nanoparticles from the biomass becomes intricate. However realizing the importance of carbon supported catalyst for many important organic reactions we envisaged these nanoparticles as a source for carbon supported catalyst. Herein we demonstrate the heat treatment of intracellular biogenic nanoparticles under inert atmosphere as an efficient method for the preparation of carbon supported metal oxide catalysts. Aspergillus ochraceus, a fungus isolated from foundries, on incubation with K(2)TiF(6) led to the synthesis of intracellular titanium oxide nanoparticles. The nanoparticles embedded biomass upon heat treatment at 600 degrees C in a nitrogen environment gave titanium oxide nanoparticles implanted in a carbonaceous matrix. The material thus formed was characterized using FTIR spectroscopy, Raman spectroscopy, HRTEM and X-ray diffraction. Appreciable benzaldehyde selectivity was observed when styrene oxidation was carried out over such immobilized catalysts. The conversion rate was determined to be 76% and the benzaldehyde selectivity was greater than 80%.</p>10aBenzaldehyde Selectivity10aBiosynthesis10aCarbon Supported Titania10aNanoparticles10aStyrene Oxidation1 aVijayakumar, P., S.1 aSelvakumar, S.1 aGholap, Ramkrishna, S.1 aSingh, A., P.1 aPrasad, Bhagavatula L. V.  uhttps://library.ncl.res.in/content/vice-virtue-intracellular-biogenic-nanoparticles-generation-carbon-supported-catalysts-0