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425 results on '"Pfeifer, Blaine A."'

7. Microbial green synthesis of luminescent terbium sulfide nanoparticles using E. Coli: a rare earth element detoxification mechanism.

Author

León, Juan José, Oetiker, Nía, Torres, Nicolás, Bruna, Nicolás, Oskolkov, Evgenii, Lei, Pedro, Kuzmin, Andrey N., Chen, Kaiwen, Andreadis, Stelios, Pfeifer, Blaine A., Swihart, Mark T., Prasad, Paras N., and Pérez-Donoso, José

Subjects
RARE earth metals, RARE earth ions, MICROBIOLOGICAL synthesis, SULFUR metabolism, CHEMICAL synthesis, TERBIUM
Abstract

Background: Rare-earth sulfide nanoparticles (NPs) could harness the optical and magnetic features of rare-earth ions for applications in nanotechnology. However, reports of their synthesis are scarce and typically require high temperatures and long synthesis times. Results: Here we present a biosynthesis of terbium sulfide (TbS) NPs using microorganisms, identifying conditions that allow Escherichia coli to extracellularly produce TbS NPs in aqueous media at 37 °C by controlling cellular sulfur metabolism to produce a high concentration of sulfide ions. Electron microscopy revealed ultrasmall spherical NPs with a mean diameter of 4.1 ± 1.3 nm. Electron diffraction indicated a high degree of crystallinity, while elemental mapping confirmed colocalization of terbium and sulfur. The NPs exhibit characteristic absorbance and luminescence of terbium, with downshifting quantum yield (QY) reaching 28.3% and an emission lifetime of ~ 2 ms. Conclusions: This high QY and long emission lifetime is unusual in a neat rare-earth compound; it is typically associated with rare-earth ions doped into another crystalline lattice to avoid non-radiative cross relaxation. This suggests a reduced role of nonradiative processes in these terbium-based NPs. This is, to our knowledge, the first report revealing the advantage of biosynthesis over chemical synthesis for Rare Earth Element (REE) based NPs, opening routes to new REE-based nanocrystals. [ABSTRACT FROM AUTHOR]

Published
2024
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19. Current and Emerging Options for Taxol Production

Author

Li, Yi, Zhang, Guojian, Pfeifer, Blaine A., Scheper, Thomas, Series editor, Belkin, Shimshon, Series editor, Doran, Pauline M., Series editor, Gu, Man Bock, Series editor, Hu, Wei-Shou, Series editor, Mattiasson, Bo, Series editor, Nielsen, Jens, Series editor, Seitz, Harald, Series editor, Stephanopoulos, Gregory N., Series editor, Ulber, Roland, Series editor, Zeng, An-Ping, Series editor, Zhong, Jian-Jiang, Series editor, Zhou, Weichang, Series editor, Schrader, Jens, editor, and Bohlmann, Jörg, editor

Published
2015
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24. Directed vaccination against pneumococcal disease

Author

Li, Yi, Hill, Andrew, Beitelshees, Marie, Shao, Shuai, Lovell, Jonathan F., Davidson, Bruce A., Knight, Paul R., Hakansson, Anders P., Pfeifer, Blaine A., and Jones, Charles H.

Published
2016

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