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27 results on '"Galloway, Johanna M."'

1. Universality of Hair as a Nucleant: Exploring the Effects of Surface Chemistry and Topography

Author

Dunn, Thomas H., primary, Skaanvik, Sebastian. A., additional, McPherson, Ian J., additional, O’Shaughnessy, Cedrick, additional, He, Xuefeng, additional, Kulak, Alexander N., additional, Micklethwaite, Stuart, additional, Matamoros-Veloza, Adriana, additional, Sandei, Ilaria, additional, Hunter, Liam, additional, Turner, Thomas D., additional, Galloway, Johanna M., additional, Rosenthal, Martin, additional, Britton, Andrew J., additional, Walker, Marc, additional, Dong, Mingdong, additional, Unwin, Patrick R., additional, and Meldrum, Fiona C., additional

Published
2023
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2. Electron transparent nanotubes reveal crystallization pathways in confinement

Author

Galloway, Johanna M., primary, Aslam, Zabeada P., additional, Yeandel, Stephen R., additional, Kulak, Alexander, additional, Ilett, Martha A., additional, Kim, Yi-Yeoun, additional, Bejarano-Villafuerte, Angela, additional, Pokroy, Boaz, additional, Drummond-Brydson, Rik M., additional, Freeman, Colin L., additional, Harding, John H., additional, Kapur, Nikil, additional, and Meldrum, Fiona C., additional

Published
2023
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4. Understanding crystal nucleation mechanisms: where do we stand? General discussion

Author

Anderson, Michael W., primary, Bennett, Matthew, additional, Cedeno, Ruel, additional, Cölfen, Helmut, additional, Cox, Stephen J., additional, Cruz-Cabeza, Aurora J., additional, De Yoreo, James J., additional, Drummond-Brydson, Rik, additional, Dudek, Marta K., additional, Fichthorn, Kristen A., additional, Finney, Aaron R., additional, Ford, Ian, additional, Galloway, Johanna M., additional, Gebauer, Denis, additional, Grossier, Romain, additional, Harding, John H., additional, Hare, Alan, additional, Horváth, Dezső, additional, Hunter, Liam, additional, Kim, Joonsoo, additional, Kimura, Yuki, additional, Kirschhock, Christine E. A., additional, Kiselev, Alexei A., additional, Kras, Weronika, additional, Kuttner, Christian, additional, Lee, Alfred Y., additional, Liao, Zhiyu, additional, Maini, Lucia, additional, Nilsson Lill, Sten O., additional, Pellens, Nick, additional, Price, Sarah L., additional, Rietveld, Ivo B., additional, Rimer, Jeffrey D., additional, Roberts, Kevin J., additional, Rogal, Jutta, additional, Salvalaglio, Matteo, additional, Sandei, Ilaria, additional, Schuszter, Gábor, additional, Sefcik, Jan, additional, Sun, Wenhao, additional, ter Horst, Joop H., additional, Ukrainczyk, Marko, additional, Van Driessche, Alexander E. S., additional, Veesler, Stéphane, additional, Vekilov, Peter G., additional, Verma, Vivek, additional, Whale, Thomas, additional, Wheatcroft, Helen P., additional, and Zeglinski, Jacek, additional

Published
2022
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6. De Novo Designed Peptide and Protein Hairpins Self‐Assemble into Sheets and Nanoparticles

Author

Galloway, Johanna M., primary, Bray, Harriet E. V., additional, Shoemark, Deborah K., additional, Hodgson, Lorna R., additional, Coombs, Jennifer, additional, Mantell, Judith M., additional, Rose, Ruth S., additional, Ross, James F., additional, Morris, Caroline, additional, Harniman, Robert L., additional, Wood, Christopher W., additional, Arthur, Christopher, additional, Verkade, Paul, additional, and Woolfson, Derek N., additional

Published
2021
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8. De Novo Designed Peptide and Protein Hairpins Self-assemble into Sheets and Nanoparticles

Author

Galloway, Johanna M., primary, Bray, Harriet E. V., additional, Shoemark, Deborah K., additional, Hodgson, Lorna R., additional, Coombs, Jennifer, additional, Mantell, Judith M., additional, Rose, Ruth S., additional, Ross, James F., additional, Morris, Caroline, additional, Harniman, Robert L., additional, Wood, Christopher W., additional, Arthur, Christopher, additional, Verkade, Paul, additional, and Woolfson, Derek N., additional

Published
2020
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9. Using a biomimetic membrane surface experiment to investigate the activity of the magnetite biomineralisation protein Mms6† †Electronic supplementary information (ESI) available: Including Mms6 protein and peptide sequences, additional QCM-D and SEM data and protein modelling. See DOI: 10.1039/c5ra16469a Click here for additional data file

Author

Bird, Scott M., Rawlings, Andrea E., Galloway, Johanna M., and Staniland, Sarah S.

Subjects
Chemistry
Abstract

Using a surface-based mimic of a magnetosome interior, the biomineralisation protein Mms6 was found to be a more effective nucleator than binder of magnetite nanoparticles, and performs better than its C-terminal region alone., Magnetotactic bacteria are able to synthesise precise nanoparticles of the iron oxide magnetite within their cells. These particles are formed in dedicated organelles termed magnetosomes. These lipid membrane compartments use a range of biomineralisation proteins to nucleate and regulate the magnetite crystallisation process. A key component is the membrane protein Mms6, which binds to iron ions and helps to control the formation of the inorganic core. We have previously used Mms6 on gold surfaces patterned with a self-assembled monolayer to successfully produce arrays of magnetic nanoparticles. Here we use this surface system as a mimic of the interior face of the magnetosome membrane to study differences between intact Mms6 and the acid-rich C-terminal peptide subregion of the Mms6 protein. When immobilised on surfaces, the peptide is unable to reproduce the particle size or homogeneity control exhibited by the full Mms6 protein in our experimental setup. Moreover, the peptide is unable to support anchoring of a dense array of nanoparticles to the surface. This system also allows us to deconvolute particle binding from particle nucleation, and shows that Mms6 particle binding is less efficient when supplied with preformed magnetite nanoparticles when compared to particles precipitated from solution in the presence of the surface immobilised Mms6. This suggests that Mms6 binds to iron ions rather than to magnetite surfaces in our system, and is perhaps a nucleating agent rather than a controller of magnetite crystal growth. The comparison between the peptide and the protein under identical experimental conditions indicates that the full length sequence is required to support the full function of Mms6 on surfaces.

Published
2016

10. Bioinspired Silicification Reveals Structural Detail in Self-Assembled Peptide Cages

Author

Galloway, Johanna M., Senior, Laura, Fletcher, Jordan M., Beesley, Joseph L., Hodgson, Lorna R., Harniman, Robert L., Mantell, Judith M., Coombs, Jennifer, Rhys, Guto G., Xue, Wei-Feng, Mosayebi, Majid, Linden, Noah, Liverpool, Tanniemola B., Curnow, Paul, Verkade, Paul, Woolfson, Derek N., Galloway, Johanna M., Senior, Laura, Fletcher, Jordan M., Beesley, Joseph L., Hodgson, Lorna R., Harniman, Robert L., Mantell, Judith M., Coombs, Jennifer, Rhys, Guto G., Xue, Wei-Feng, Mosayebi, Majid, Linden, Noah, Liverpool, Tanniemola B., Curnow, Paul, Verkade, Paul, and Woolfson, Derek N.

Abstract

Understanding how molecules in self-assembled soft-matter nanostructures are organized is essential for improving the design of next-generation nanomaterials. Imaging these assemblies can be challenging and usually requires processing, e.g., staining or embedding, which can damage or obscure features. An alternative is to use bioinspired mineralization, mimicking how certain organisms use biomolecules to template mineral formation. Previously, we have reported the design and characterization of Self-Assembled peptide caGEs (SAGEs) formed from de novo peptide building blocks. In SAGEs, two complementary, 3-fold symmetric, peptide hubs combine to form a hexagonal lattice, which curves and closes to form SAGE nanoparticles. As hexagons alone cannot tile onto spheres, the network must also incorporate nonhexagonal shapes. While the hexagonal ultrastructure of the SAGEs has been imaged, these defects have not been observed. Here, we show that positively charged SAGEs biotemplate a thin, protective silica coating. Electron microscopy shows that these SiO2-SAGEs do not collapse, but maintain their 3D shape when dried. Atomic force microscopy reveals a network of hexagonal and irregular features on the SiO2-SAGE surface. The dimensions of these (7.2 nm ± 1.4 nm across, internal angles 119.8° ± 26.1°) are in accord with the designed SAGE network and with coarse-grained modeling of the SAGE assembly. The SiO2-SAGEs are permeable to small molecules (<2 nm), but not to larger biomolecules (>6 nm). Thus, bioinspired silicification offers a mild technique that preserves soft-matter nanoparticles for imaging, revealing structural details <10 nm in size, while also maintaining desirable properties, such as permeability to small molecules.

Published
2018

11. Bioinspired Silicification Reveals Structural Detail in Self-Assembled Peptide Cages

Author

Galloway, Johanna M., primary, Senior, Laura, additional, Fletcher, Jordan M., additional, Beesley, Joseph L., additional, Hodgson, Lorna R., additional, Harniman, Robert L., additional, Mantell, Judith M., additional, Coombs, Jennifer, additional, Rhys, Guto G., additional, Xue, Wei-Feng, additional, Mosayebi, Majid, additional, Linden, Noah, additional, Liverpool, Tanniemola B., additional, Curnow, Paul, additional, Verkade, Paul, additional, and Woolfson, Derek N., additional

Published
2017
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20. Biotemplated Magnetic Nanoparticle Arrays

Author

Galloway, Johanna M., primary, Bramble, Jonathan P., additional, Rawlings, Andrea E., additional, Burnell, Gavin, additional, Evans, Stephen D., additional, and Staniland, Sarah S., additional

Published
2011
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22. Developing Biotemplated Data Storage: Room Temperature Biomineralization of L10 CoPt Magnetic Nanoparticles.

Author

Galloway, Johanna M., Talbot, Jennifer E., Critchley, Kevin, Miles, Jim J., and Bramble, Jonathan P.

Subjects
*MAGNETIC storage, *NANOPARTICLES, *BIOMINERALIZATION, *DATA disk drives, *BIOMOLECULES, *SILICON oxide
Abstract

L10 cobalt platinum can be used to record data at approximately sixfold higher densities than it is possible to on existing hard disks. Currently, fabricating L10 CoPt requires high temperatures (≈500 °C) and expensive equipment. One ecological alternative is to exploit biomolecules that template nanomaterials at ambient temperatures. Here, it is demonstrated that a dual affinity peptide (DAP) can be used to biotemplate L10 CoPt onto a surface at room temperature from an aqueous solution. One part of the peptide nucleates and controls the growth of CoPt nanoparticles from solution, and the other part binds to SiO2. A native silicon oxide surface is functionalized with a high loading of the DAP using microcontact printing. The DAP biotemplates a monolayer of uniformly sized and shaped nanoparticles when immobilized on the silicon surface. X-ray diffraction shows that the biotemplated nanoparticles have the L10 CoPt crystal structure, and magnetic measurements reveal stable, multiparticle zones of interaction, similar to those seen in perpendicular recording media. This is the first time that the L10 phase of CoPt has been formed without high temperature/vacuum treatment (e.g., annealing or sputtering) and offers a significant advancement toward developing environmentally friendly, biotemplated materials for use in data storage. [ABSTRACT FROM AUTHOR]

Published
2015
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24. Nanomagnetic Arrays Formed with the Biomineralization Protein Mms6

Author

Galloway, Johanna M., Bramble, Jonathan P., Rawlings, Andrea E., Burnell, Gavin, Evans, Stephen D., and Staniland, Sarah S.

Abstract

Many Modern Technologies, such as High Density Data Storage, Require Monodispersed Magnetic Nanoparticles (MNPs), which Have a Consistent Magnetic Behavior, Specifically Immobilized onto a Patterned Surface. Current Methods for Synthesizing Uniform Mnps Require High Temperatures and Harsh Chemicals, which Is Not Environmentally Friendly. Also, the Particles Are Expensive to Make and Expensive to Pattern Using Conventional Lithography Methods. Magnetic Bacteria Are Able to Synthesize Consistent Mnps in Vivo Using Biomineralization Proteins inside Magnetosome Vesicles to Control Particle Size and Shape and Make Single Domain Mnps. Mms6 Is a Biomineralization Protein that Is Able to Template Cubo-Octahedral MNP Formation in Vitro. it Is Thought the N-Terminus Helps Integrate the Protein into the Magnetosome Membrane, and the C-Terminus Interacts with Magnetite during Nucleation and/or MNP Growth. by Selectively Attaching Mms6 to a Patterned Self Assembled Monolayer via the N-Terminus, Patterns of Uniform Magnetite Mnps Are Templated in Situ. this Also Requires Careful Selection of the Mineralization Solution Used to Mineralize the Patterned Mms6. here we Evaluate some Low Temperature (room Temperature to &lt; 100°C) Methods of Magnetite Formation to Produce Monodispersed Magnetite Mnps onto Immobilized Mms6. Room Temperature Co-Precipitation (RTCP) Was Found to Be Unsuitable, as the Magnetite Does Not Form on the Immobilized Mms6, but Appears to Form Rapidly as Base Is Added. Partial Oxidation of Ferrous Hydroxide (POFH) Was Found to Be Able to Form Consistent Magnetite Mnps on the Immobilized Mms6, as the Reactants Gradually Mature to Form Magnetite over a few Hours (at 80°C) or a few Days (room Temperature). by Carefully Controlling the Type of Base Used, the Ratio of the Reactants and the Temperature and Duration of the POFH Mineralization Reaction, this System Was Optimized to Produce Consistent Mnps (340 ± 54 Nm, Coercivity 109 Oe) on the Immobilized Mms6, with Scarcely any Mineralization on the Anti-Biofouling Background. the Mnps Are Ferrimagnetic, and Appear to Be Exchange Coupled across Multiple Particles in MFM Measurements. the Specificity of this Method towards Precise Magnetite Mineralization under Relatively Mild Conditions May Be Adapted to Nanoscale Patterning of Multiple Biotemplated Materials, by Using other Biomineralization Proteins or Peptides. this Would Allow the Fabrication of Cheaper, More Environmentally Friendly Components for Devices of the Future.

Published
2008
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25. Data Storage: Developing Biotemplated Data Storage: Room Temperature Biomineralization of L10 CoPt Magnetic Nanoparticles (Adv. Funct. Mater. 29/2015).

Author

Galloway, Johanna M., Talbot, Jennifer E., Critchley, Kevin, Miles, Jim J., and Bramble, Jonathan P.

Abstract

L10 CoPt can be used in data storage, but high temperatures (500 °C) are usually needed to achieve this. On page 4590, J. Galloway and colleagues demonstrate a bioinspired and ecological synthesis that uses a biotemplating peptide to form L10 CoPt nanoparticles at room temperature. A surface covered with biotemplated magnetic nanoparticles is illustrated in the back cover by Dr. Marcin Górzny (marcingorzny.com). [ABSTRACT FROM AUTHOR]

Published
2015
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26. Bioinspired Silicification Reveals Structural Detail in Self-Assembled Peptide Cages.

Author

Galloway JM, Senior L, Fletcher JM, Beesley JL, Hodgson LR, Harniman RL, Mantell JM, Coombs J, Rhys GG, Xue WF, Mosayebi M, Linden N, Liverpool TB, Curnow P, Verkade P, and Woolfson DN

Subjects
Particle Size, Peptides chemistry, Surface Properties, Peptides chemical synthesis, Silicon Dioxide chemistry
Abstract

Understanding how molecules in self-assembled soft-matter nanostructures are organized is essential for improving the design of next-generation nanomaterials. Imaging these assemblies can be challenging and usually requires processing, e.g., staining or embedding, which can damage or obscure features. An alternative is to use bioinspired mineralization, mimicking how certain organisms use biomolecules to template mineral formation. Previously, we have reported the design and characterization of Self-Assembled peptide caGEs (SAGEs) formed from de novo peptide building blocks. In SAGEs, two complementary, 3-fold symmetric, peptide hubs combine to form a hexagonal lattice, which curves and closes to form SAGE nanoparticles. As hexagons alone cannot tile onto spheres, the network must also incorporate nonhexagonal shapes. While the hexagonal ultrastructure of the SAGEs has been imaged, these defects have not been observed. Here, we show that positively charged SAGEs biotemplate a thin, protective silica coating. Electron microscopy shows that these SiO 2 -SAGEs do not collapse, but maintain their 3D shape when dried. Atomic force microscopy reveals a network of hexagonal and irregular features on the SiO 2 -SAGE surface. The dimensions of these (7.2 nm ± 1.4 nm across, internal angles 119.8° ± 26.1°) are in accord with the designed SAGE network and with coarse-grained modeling of the SAGE assembly. The SiO 2 -SAGEs are permeable to small molecules (<2 nm), but not to larger biomolecules (>6 nm). Thus, bioinspired silicification offers a mild technique that preserves soft-matter nanoparticles for imaging, revealing structural details <10 nm in size, while also maintaining desirable properties, such as permeability to small molecules.

Published
2018
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27. Biomimetic synthesis of materials for technology.

Author

Galloway JM, Bramble JP, and Staniland SS

Subjects
Biomimetics methods, Genetic Engineering methods, Information Storage and Retrieval methods, Information Storage and Retrieval trends, Optics and Photonics methods, Optics and Photonics trends, Biomimetic Materials chemical synthesis, Biomimetics trends
Abstract

In a world with ever decreasing natural reserves, researchers are striving to find sustainable methods of producing components for technology. Bioinspired, biokleptic and biomimetic materials can be used to form a wide range of technologically relevant materials under environmentally friendly conditions. Here we investigate a range of biotemplated and bioinspired materials that can be used to develop components for devices, such as optics, photonics, photovoltaics, circuits and data storage., (Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.)

Published
2013
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