01154nas a2200193   4500008004100000022001400041245011600055210006900171260007700240300000900317490000700326520042000333100001800753700001500771700001700786700001700803700001900820856012100839       2005                        eng d  a0935-964800aBioleaching of sand by the fungus fusarium oxysporum as a means of producing extracellular silica nanoparticles0 aBioleaching of sand by the fungus fusarium oxysporum as a means   aPO BOX 10 11 61, D-69451 WEINHEIM, GERMANYbWILEY-V C H VERLAG GMBHcAPR  a889+0 v173 a<p>A plant pathogenic fungus, Fusarium oxysporum, can be used as a biological model system for the extracellular bioleaching of hollow spherical silica nanoparticles (see Figure) from sand. The room-temperature synthesis of oxide nanomaterials using microorganisms starting from potential waste materials could lead to eco-friendly and economically viable methods for the large-scale synthesis of nanomaterials.</p>1 aBansal, Vipul1 aSanyal, A.1 aRautaray, D.1 aAhmad, Absar1 aSastry, Murali  uhttps://library.ncl.res.in/content/bioleaching-sand-fungus-fusarium-oxysporum-means-producing-extracellular-silica-001229nas a2200193   4500008004100000022001400041245011700055210006900172260007100241300001200312490000600324520049000330100001700820700001500837700002100852700001700873700001500890856013000905       2005                        eng d  a1528-748300aBiological synthesis of stable vaterite crystals by the reaction of calcium ions with germinating chickpea seeds0 aBiological synthesis of stable vaterite crystals by the reaction  a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcMAR  a399-4020 v53 a<p>The total biological synthesis of CaCO3 crystals of the metastable vaterite polymorph at room temperature by simple protein-mediated reaction of aqueous Ca2+ ions with the CO2 generated during the root growth from germinating chickpea (Cicer arietinum) seeds is described. Highly stable vaterite crystals of spherical morphology are obtained, indicating that the proteins secreted from the roots during growth play a crucial role in stabilizing and directing the crystal growth.</p>1 aRautaray, D.1 aSanyal, A.1 aBharde, Atul, A.1 aAhmad, Absar1 aSastry, M.  uhttps://library.ncl.res.in/content/biological-synthesis-stable-vaterite-crystals-reaction-calcium-ions-germinating-chickpea-001281nas a2200217   4500008004100000022001400041245009700055210006900152260008700221300001400308490000700322520047000329653001800799653002100817653002600838653002400864100001500888700001700903700001500920856012800935       2005                        eng d  a0011-389100aCalcite growth in Cissus quadrangularis plant extract, a traditional Indian bone-healing aid0 aCalcite growth in Cissus quadrangularis plant extract a traditio  aC V RAMAN AVENUE, PO BOX 8005, BANGALORE 560 080, INDIAbCURRENT SCIENCE ASSNcNOV  a1742-17450 v893 a<p>Cissus quadrangularis, a plant that has been customarily used in the Indian subcontinent to hasten the process of healing in bone fractures, has been studied and exploited to synthesize calcite crystals. The plant extract serves as a rich source of calcium ions, which when reacted with CO2, leads to the formation of calcite crystals of highly irregular morphology indicating that bioorganic molecules present in the extract modulate the crystal morphology.</p>10abone fracture10acalcite crystals10aCissus quadrangularis10atraditional healing1 aSanyal, A.1 aAhmad, Absar1 aSastry, M.  uhttps://library.ncl.res.in/content/calcite-growth-cissus-quadrangularis-plant-extract-traditional-indian-bone-healing-aid-001498nas a2200217   4500008004100000022001400041245006500055210006400120260011000184300001400294490000700308520073800315100001801053700001701071700002101088700002101109700001501130700001701145700001901162856009901181       2005                        eng d  a0959-942800aFungus-mediated biosynthesis of silica and titania particles0 aFungusmediated biosynthesis of silica and titania particles  aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcMAY  a2583-25890 v153 a<p>The synthesis of inorganic materials by biological systems is characterized by processes that occur at close to ambient temperatures, pressures and neutral pH. This is exemplified by biosilicification in marine organisms such as diatoms while laboratory-based synthesis of silica involves extreme temperature and pH conditions. We show here that silica and titania particles may be produced by challenging the fungus Fusarium oxysporum with aqueous anionic complexes SiF62- and TiF62- respectively. Extra-cellular protein-mediated hydrolysis of the anionic complexes results in the facile room temperature synthesis of crystalline titania particles while calcination at 300 degrees C is required for crystallization of silica.</p>1 aBansal, Vipul1 aRautaray, D.1 aBharde, Atul, A.1 aAhire, Kedar, C.1 aSanyal, A.1 aAhmad, Absar1 aSastry, Murali  uhttps://library.ncl.res.in/content/fungus-mediated-biosynthesis-silica-and-titania-particles-001649nas a2200193   4500008004100000022001400041245010400055210006900159260007100228300001400299490000700313520092400320100001501244700001701259700001801276700001701294700001901311856012501330       2005                        eng d  a0743-746300aHeavy-metal remediation by a fungus as a means of production of lead and cadmium carbonate crystals0 aHeavymetal remediation by a fungus as a means of production of l  a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcAUG  a7220-72240 v213 a<p>We show here that reaction of the fungus, Fusarium oxysporum, with the aqueous heavy-metal ions Pb2+ and Cd2+ results in the one-step formation of the corresponding metal carbonates. The metal carbonates are formed by reaction of the heavy-metal ions with CO2 produced by the fungus during metabolism and thus provide a completely biological method for production of crystals of metal carbonates. The PbCO3 and CdCO3 crystals thus produced have interesting morphologies that are shown to arise because of interaction of the growing crystals with specific proteins secreted by the fungus during reaction. An additional advantage of this approach is that the reaction leads to detoxification of the aqueous solution and could have immense potential for bioremediation of heavy metals. Under conditions of this study, the metal ions are not toxic to the fungus, which readily grows after exposure to the metal ions.</p>1 aSanyal, A.1 aRautaray, D.1 aBansal, Vipul1 aAhmad, Absar1 aSastry, Murali  uhttps://library.ncl.res.in/content/heavy-metal-remediation-fungus-means-production-lead-and-cadmium-carbonate-crystals-001196nas a2200169   4500008004100000022001400041245010300055210006900158260007700227300001200304490000700316520053000323100001500853700001900868700001500887856012400902       2005                        eng d  a1616-301X00aSynthesis and assembly of gold nanoparticles in quasi-linear lysine-keggin-ion colloidal particles0 aSynthesis and assembly of gold nanoparticles in quasilinear lysi  aPO BOX 10 11 61, D-69451 WEINHEIM, GERMANYbWILEY-V C H VERLAG GMBHcFEB  a273-2800 v153 a<p>The formation of fiber-like colloidal particles of the amino acid lysine complexed with Keggin ions is demonstrated. The lysine-phosphotungstic acid (PTA) colloidal particles act as excellent templates for the synthesis and assembly of gold nanoparticles wherein the lysine-PTA complex acts as a UV-switchable reducing agent for gold ions. This novel bio-organic-inorganic template shows excellent potential as a regulated nanoreactor for application in programmed nanoparticle synthesis and assembly in a single step.</p>1 aSanyal, A.1 aMandal, Sujata1 aSastry, M.  uhttps://library.ncl.res.in/content/synthesis-and-assembly-gold-nanoparticles-quasi-linear-lysine-keggin-ion-colloidal-0