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Richard D. Leapman

Researcher at National Institutes of Health

Publications -  248
Citations -  18374

Richard D. Leapman is an academic researcher from National Institutes of Health. The author has contributed to research in topics: Scanning transmission electron microscopy & Electron energy loss spectroscopy. The author has an hindex of 57, co-authored 241 publications receiving 16971 citations. Previous affiliations of Richard D. Leapman include University of Cambridge & National Center for Research Resources.

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A structural model for Alzheimer's β-amyloid fibrils based on experimental constraints from solid state NMR

TL;DR: A structural model for amyloid fibrils formed by the 40-residue β-amyloid peptide associated with Alzheimer's disease (Aβ1–40) is presented, based on a set of experimental constraints from solid state NMR spectroscopy and incorporates the cross-β structural motif established by x-ray fiber diffraction.
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Self-Propagating, Molecular-Level Polymorphism in Alzheimer's ß-Amyloid Fibrils

TL;DR: Using electron microscopy and solid-state nuclear magnetic resonance measurements on fibrils formed by the 40-residue β-amyloid peptide of Alzheimer's disease (Aβ1–40), it is shown that different fibril morphologies have different underlying molecular structures, that the predominant structure can be controlled by subtle variations infibril growth conditions, and that both morphology and molecular structure are self-propagating when fibrs grow from preformed seeds.
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Molecular structural basis for polymorphism in Alzheimer's β-amyloid fibrils

TL;DR: A full structural model for amyloid fibrils formed by the 40-residue β-amyloid peptide associated with Alzheimer's disease (Aβ1–40), based on numerous constraints from solid state NMR and electron microscopy is described.
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Targeted killing of cancer cells in vivo and in vitro with EGF-directed carbon nanotube-based drug delivery.

TL;DR: The first targeted, in vivo killing of cancer cells using a drug-single wall carbon nanotube (SWNT) bioconjugate is reported, and regression of tumor growth was rapid in mice treated with targeted SWNT-cisplatin-EGF relative to nontargeted SWNTs.
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Amyloid Fibril Formation by Aβ16-22, a Seven-Residue Fragment of the Alzheimer's β-Amyloid Peptide, and Structural Characterization by Solid State NMR†

TL;DR: One-dimensional and two-dimensional spectra of selectively and uniformly labeled samples exhibit 13C NMR line widths of <2 ppm, demonstrating that the peptide, including amino acid side chains, has a well-ordered conformation in the fibrils.