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  • 1
    Language: English
    In: Journal of the American Chemical Society, 10 August 2011, Vol.133(31), pp.11837-9
    Description: DNA-templated silver nanoclusters are promising biological fluorescence probes due to their useful fluorescence properties, including tunability of emission wavelength through DNA template sequence variations. Ag K-edge EXAFS analysis of DNA-templated silver nanoclusters has been used to obtain insight into silver nanocluster bonding, size, and structural correlations to fluorescence. The results indicate the presence of small silver nanoclusters (〈30 silver atoms) containing Ag-Ag bonds and Ag-N/O ligations to DNA. The DNA sequence used leads to differences in silver-DNA ligation as well as silver nanocluster size. The results support a model in which cooperative effects of both Ag-DNA ligation and variations in cluster size lead to the tuning of the fluorescence emission of DNA-templated silver nanoclusters.
    Keywords: Fluorescence ; DNA -- Chemistry ; Metal Nanoparticles -- Chemistry ; Silver -- Chemistry
    ISSN: 00027863
    E-ISSN: 1520-5126
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  • 2
    Language: English
    In: Journal of the American Chemical Society, 18 July 2012, Vol.134(28), pp.11550-8
    Description: Rapid and precise screening of small genetic variations, such as single-nucleotide polymorphisms (SNPs), among an individual's genome is still an unmet challenge at point-of-care settings. One crucial step toward this goal is the development of discrimination probes that require no enzymatic reaction and are easy to use. Here we report a new type of fluorescent molecular probe, termed a chameleon NanoCluster Beacon (cNCB), that lights up into different colors upon binding SNP targets. NanoCluster Beacons (NCBs) are collections of a small number of Ag atoms templated on single-stranded DNA that fluoresce strongly when placed in proximity to particular DNA sequences, termed enhancers. Here we show the fluorescence emission color of a NCB can change substantially (a shift of 60-70 nm in the emission maximum) depending upon the alignment between the silver nanocluster and the DNA enhancer sequence. Chameleon NCBs exploit this color shift to directly detect SNPs, based on the fact that different SNPs produce a different alignment between the Ag nanocluster and the enhancer. This SNP detection method has been validated on all single-nucleotide substitution scenarios in three synthetic DNA targets, in six disease-related SNP targets, and in two clinical samples taken from patients with ovarian serous borderline tumors. Samples with single-nucleotide variations can be easily identified by the naked eye under UV excitation, making this method a reliable and low-cost assay with a simple readout format.
    Keywords: Fluorescence ; Nanostructures ; Polymorphism, Genetic
    ISSN: 00027863
    E-ISSN: 1520-5126
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  • 3
    In: Chemical Communications, 2014, Vol.50(55), pp.7277-7279
    Description: Silica nanofibers of an average diameter 30 nm and length 100 m have been synthesized using an unprecedented strategy: sound waves. A new phenomenon, spinning off the nanofibers at silica rod tips, is also observed.
    ISSN: 1359-7345
    E-ISSN: 1364-548X
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  • 4
    Language: English
    In: Angewandte Chemie International Edition, 07 January 2014, Vol.53(2), pp.451-454
    Description: The control of the diameter of colloidal structures is of fundamental interest and practical importance. We synthesized segmented silica rods by regulating the reaction temperature while the rods were growing. With higher growth temperatures, the segment diameter became smaller. Longer incubation times gave longer segments at the same temperature. Similarly, high temperature for the same incubation time gave longer segments. It appears that the correlation between temperature and diameter results from the relation between temperature and the size of the emulsion droplet, that is, the higher the temperature, the smaller the emulsion droplet. of segmented silica rods was possible by regulating the reaction temperature during growth. Segmented silica rods with controlled local thickness (such as thick‐thin‐thick, thin‐thick‐thin, or thin‐thick‐thicker) were thus obtained.
    Keywords: Colloids ; Growth Regulation ; Segmented Rods ; Silicates ; Temperature Control
    ISSN: 1433-7851
    E-ISSN: 1521-3773
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  • 5
    Language: English
    In: Science (New York, N.Y.), 02 January 2009, Vol.323(5910), pp.112-6
    Description: The assembly of nanoparticles into three-dimensional (3D) architectures could allow for greater control of the interactions between these particles or with molecules. DNA tubes are known to form through either self-association of multi-helix DNA bundle structures or closing up of 2D DNA tile lattices. By the attachment of single-stranded DNA to gold nanoparticles, nanotubes of various 3D architectures can form, ranging in shape from stacked rings to single spirals, double spirals, and nested spirals. The nanoparticles are active elements that control the preference for specific tube conformations through size-dependent steric repulsion effects. For example, we can control the tube assembly to favor stacked-ring structures using 10-nanometer gold nanoparticles. Electron tomography revealed a left-handed chirality in the spiral tubes, double-wall tube features, and conformational transitions between tubes.
    Keywords: Gold ; DNA -- Chemistry ; Metal Nanoparticles -- Chemistry ; Nanotubes -- Chemistry
    ISSN: 00368075
    E-ISSN: 1095-9203
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  • 6
    In: Chemical Communications, 2011, Vol.47(8), pp.2294-2296
    Description: We have synthesized an intrinsically fluorescent recognition ligand that combines the high fluorescence quantum yield (〉50%) of oligonucleotide templated AgNCs with the specificity and strong binding affinity of DNA aptamers for their target proteins, to develop a new strategy for detection of specific proteins.
    Keywords: Aptamers, Nucleotide -- Chemistry ; Nanostructures -- Chemistry ; Silver -- Chemistry ; Spectrometry, Fluorescence -- Methods ; Thrombin -- Analysis;
    ISSN: 1359-7345
    E-ISSN: 1364-548X
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  • 7
    Language: English
    In: Biophysical Journal, 31 January 2012, Vol.102(3), pp.186a-186a
    Keywords: Biology
    ISSN: 0006-3495
    E-ISSN: 1542-0086
    Source: ScienceDirect Journals (Elsevier)
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  • 8
    Language: English
    In: Biophysical Journal, 29 January 2013, Vol.104(2), pp.545a-545a
    Keywords: Biology
    ISSN: 0006-3495
    E-ISSN: 1542-0086
    Source: ScienceDirect Journals (Elsevier)
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  • 9
    Language: English
    In: Chemistry – A European Journal, 23 December 2016, Vol.22(52), pp.18700-18704
    Description: Shape control of silica structures is demonstrated by localization of the reagents. A uniform dispersion of reagents provided straight silica rods, whereas localization of the reagents in the emulsion droplet periphery provided a new type of half‐sphere/half‐funnel structure. The effect of water concentration appeared to be related to the ease of diffusion of the silica precursor inside the emulsion droplet (i.e., the higher the water concentration, the lower the silica precursor diffusion). : Shape control of silica structures is demonstrated by localization of the reagents. A uniform dispersion of reagents provided straight silica rods, whereas localization of the reagents in the emulsion droplet periphery provided a new type of half‐sphere/half‐funnel structure.
    Keywords: Colloidal ; Localization ; Rods ; Shape ; Silica
    ISSN: 0947-6539
    E-ISSN: 1521-3765
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  • 10
    Language: English
    In: Angewandte Chemie International Edition, 27 July 2015, Vol.54(31), pp.9011-9015
    Description: The synthesis of complex and hybrid oxide microstructures is of fundamental interest and practical applications. However, the design and synthesis of such structures is a challenging task. A solution‐phase process to synthesize complex silica and silica–titania hybrid microstructures was developed by exploiting the emulsion‐droplet‐based step‐by‐step growth featuring shape control. The strategy is robust and can be extended to the preparation of complex hybrid structures consisting of two or more materials, with each having its own shape. were grown by exploiting the emulsion‐droplet‐based SiO deposition. A variety of structures such as corrugated spiky silica structures, a silica ring sandwiched in a particle dimer, and SiO–TiO hybrid structures were synthesized with good control of morphology using the same growth strategy.
    Keywords: Hierarchical Structures ; Hybrids ; Oxides ; Silica ; Titanium Oxide
    ISSN: 1433-7851
    E-ISSN: 1521-3773
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