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Title: Simultaneous cryo X-ray ptychographic and fluorescence microscopy of green algae

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America

Trace metals play important roles in normal and in disease-causing biological functions. X-ray fluorescence microscopy reveals trace elements with no dependence on binding affinities (unlike with visible light fluorophores) and with improved sensitivity relative to electron probes. However, X-ray fluorescence is not very sensitive for showing the light elements that comprise the majority of cellular material. Here we show that X-ray ptychography can be combined with fluorescence to image both cellular structure and trace element distribution in frozen-hydrated cells at cryogenic temperatures, with high structural and chemical fidelity. Ptychographic reconstruction algorithms deliver phase and absorption contrast images at a resolution beyond that of the illuminating lens or beam size. Using 5.2-keV X-rays, we have obtained sub-30-nm resolution structural images and similar to 90-nm-resolution fluorescence images of several elements in frozen-hydrated green algae. This combined approach offers a way to study the role of trace elements in their structural context.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
National Institutes of Health (NIH); USDOE Office of Science (SC); National Institutes of Health (NIH) - National Institute of General Medical Sciences
DOE Contract Number:
AC02-06CH11357
OSTI ID:
1391781
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Vol. 112, Issue 8; ISSN 0027-8424
Publisher:
National Academy of Sciences, Washington, DC (United States)
Country of Publication:
United States
Language:
English

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φXANES: In vivo imaging of metal-protein coordination environments journal February 2016
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Quantitative ptychographic bio-imaging in the water window journal January 2018
Quantitative ptychographic bio-imaging in the water window text January 2018
Nanopositioning for the ESRF ID16A Nano-Imaging Beamline journal September 2018
Effects of Moisture on Diffusion in Unmodified Wood Cell Walls: A Phenomenological Polymer Science Approach journal November 2019
Resolving 500 nm axial separation by multi-slice X-ray ptychography journal February 2019
A comparison of absorption and phase contrast for X-ray imaging of biological cells journal August 2018
X-ray ptychography journal December 2017
The Velociprobe: An ultrafast hard X-ray nanoprobe for high-resolution ptychographic imaging journal August 2019
X-ray microscopy journal July 1965
Correlative microscopy approach for biology using X-ray holography, X-ray scanning diffraction and STED microscopy text January 2018
Multimodal X-ray imaging of nanocontainer-treated macrophages and calcium distribution in the perilacunar bone matrix journal February 2020
High-resolution complementary chemical imaging of bio-elements in Caenorhabditis elegans journal January 2016
Multimodal X-ray imaging of nanocontainer-treated macrophages and calcium distribution in the perilacunar bone matrix text January 2020
Correlative microscopy approach for biology using X-ray holography, X-ray scanning diffraction and STED microscopy text January 2018
X-ray ptychographic and fluorescence microscopy of frozen-hydrated cells using continuous scanning journal March 2017
X-ray Microscopy book January 2019
Ab initio nonrigid X-ray nanotomography. journalarticle January 2019
Ab initio nonrigid X-ray nanotomography text January 2019
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Live cell X-ray imaging of autophagic vacuoles formation and chromatin dynamics in fission yeast journal October 2017
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Correlative 3D x-ray fluorescence and ptychographic tomography of frozen-hydrated green algae journal November 2018
Molar concentration from sequential 2-D water-window X-ray ptychography and X-ray fluorescence in hydrated cells text January 2023
Multimodal X-ray imaging of nanocontainer-treated macrophages and calcium distribution in the perilacunar bone matrix text January 2020
Quantifying mesoscale neuroanatomy using X-ray microtomography preprint January 2016

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