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Journal ArticleDOI

Biorecovery of gold using cyanobacteria and an eukaryotic alga with special reference to nanogold formation – a novel phenomenon

TLDR
Pro- and eukaryotic algal genera, i.e. Lyngbya majuscula, Spirulina subsalsa, and Rhizoclonium hieroglyphicum were used for bio-recovery of gold out of aqueous solution indicating quick metabolic independent binding of Au to the algae followed by active accumulation and subsequent reduction.
Abstract
Pro- and eukaryotic algal genera, i.e. Lyngbya majuscula, Spirulina subsalsa (Cyanophyceae) and Rhizoclonium hieroglyphicum (Chlorophyceae), were used for bio-recovery of gold (Au) out of aqueous solution. Au (III) spiked with 198Au was used for the experiment. Batch laboratory experiments indicated quick metabolic independent binding of Au to the algae followed by active accumulation and subsequent reduction. Gold accumulation by different algal genera was found in order of R. hieroglyphicum > L. majuscula > S. subsalsa (3.28, 1.93 and 1.73 mg g-1, respectively). It was observed that the algal biomass and the media used for the experiment turned purple in colour indicating reduction of Au (III) to Au (0) at intra- and extracellular level. This was confirmed by TEM studies of L. majuscula biomass exposed in HAuCl4 solution where <20-nm-sized gold particles were found both inside as well as on the surface of the cell. Up to 90–100% of accumulated gold was recovered from the algal biomass by using nitric acid and acidic thiourea solution.

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Book ChapterDOI

Selenium in Agriculture: Water, Air, Soil, Plants, Food, Animals and Nanoselenium

TL;DR: The most promising and important nanotechnology applications in agriculture; and nano-selenium particles production, agricultural nanotechnology and its use in sustainable development will also be highlighted in this article.
Journal ArticleDOI

Prospects and environmental sustainability of phyconanotechnology: A review on algae-mediated metal nanoparticles synthesis and mechanism.

TL;DR: The use of biological compounds by microalgae as reducing agents for the synthesis of inorganic nanoparticles has shown promising results such as cost-effective and environmentally friendly as discussed by the authors , which further consolidates their position as the best choice for sustainable (economically and environmentally) nanoparticle synthesis compared to the conventional nanoparticles synthesis pathway.
Journal ArticleDOI

Preparation and Characterization of Silver Nanoparticles and their Use in Catalytic Reduction of 4-Nitrophenol

TL;DR: In this paper, the morphology, distribution and sphericity of the particles were assessed in images from a transmission electron microscope (TEM) and the sizes of the nanoparticles were calculated as being 9, 11 and 14 nm.
Journal ArticleDOI

Time-dependent growth of crystalline Au0-nanoparticles in cyanobacteria as self-reproducing bioreactors: 2. Anabaena cylindrica

TL;DR: In this paper, X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and laser-induced breakdown spectroscopy (LIBS) are applied to monitor the time-dependent development of gold nanoparticles for up to 40 hours.
Journal ArticleDOI

Biosynthesis of silver nanoparticles using Penicillium verrucosum and analysis of their antifungal activity.

TL;DR: In this article, the authors describe the biosynthesis of silver nanoparticles using the fungus Penicillium verrucosum and demonstrate the bioactivity of the synthesized nanoparticles against two phytopathogenic fungi i.e. Fusarium chlamydosporum and Aspergillus flavus.
References
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Journal ArticleDOI

Extracellular biosynthesis of silver nanoparticles using the fungus Fusarium oxysporum

TL;DR: It is observed that aqueous silver ions when exposed to the fungus Fusarium oxysporum are reduced in solution, thereby leading to the formation of an extremely stable silver hydrosol, creating the possibility of developing a rational, fungal-based method for the synthesis of nanomaterials over a range of chemical compositions, which is currently not possible by other microbe-based methods.
Journal ArticleDOI

Polycationic Peptides from Diatom Biosilica That Direct Silica Nanosphere Formation

TL;DR: A set of polycationic peptides isolated from diatom cell walls were shown to generate networks of silica nanospheres within seconds when added to a solution of silicic acid.
Journal ArticleDOI

Molecular tectonics in biomineralization and biomimetic materials chemistry

TL;DR: The basic constructional processes of biomineralization (supramolecular pre-organization, interfacial molecular recognition (templating) and cellular processing) can provide useful archetypes for molecular-scale building, or "molecular tectonics" in inorganic materials chemistry.
Journal ArticleDOI

The use of microorganisms for the formation of metal nanoparticles and their application

TL;DR: This review describes a brief overview of the current research worldwide on the use of microorganisms in the biosynthesis of metal nanoparticles and their applications.
Journal ArticleDOI

Bioreduction of chloroaurate ions by geranium leaves and its endophytic fungus yields gold nanoparticles of different shapes

TL;DR: The use of geranium leaves and its endophytic fungus in the extra-cellular synthesis of gold nanoparticles and the possibility of achieving nanoparticle shape control in a host leaf–fungus system is potentially exciting.
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