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Related Concept Videos

X-ray Diffraction of Biological Samples01:10

X-ray Diffraction of Biological Samples

X-ray diffraction or XRD is an analytical tool that utilizes X-rays to study ordered structures such as crystalline organic and inorganic samples, polycrystalline materials, proteins, carbohydrates, and drugs.
According to Bragg's law, when X-rays strike the sample positioned on a stage, the rays are  scattered by the electron clouds around the sample atoms. The  X-ray diffraction or scattering is caused by constructive interference of the X-ray waves that reflect off the internal crystal...
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X-ray Crystallography

The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
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Electron Microscope Tomography and Single-particle Reconstruction

Transmission electron microscopy (TEM) can be used to determine the 3D structure of biological samples with the help of techniques such as electron microscope tomography and single-particle reconstruction. While single-particle reconstruction can examine macromolecules and macromolecular complexes in vitro conditions only, tomography permits the study of cell components or small cells in vivo.
Electron Tomography
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Three-Dimensional Microscopy in Microbiology01:28

Three-Dimensional Microscopy in Microbiology

Three-dimensional imaging techniques are essential in cell biology, allowing researchers to visualize intricate cellular structures with high resolution. Two prominent methods, Differential Interference Contrast Microscopy (DIC) and Confocal Scanning Laser Microscopy (CSLM), provide distinct advantages for imaging live and thick specimens, respectively.Differential Interference Contrast MicroscopyDIC microscopy enhances contrast in transparent, unstained samples by converting phase...
X-ray Imaging01:24

X-ray Imaging

German physicist Wilhelm Röntgen (1845–1923) was experimenting with electrical current when he discovered that a mysterious and invisible "ray" would pass through his flesh but leave an outline of his bones on a screen coated with a metal compound. In 1895, Röntgen made the first durable record of the internal parts of a living human: an "X-ray" image (as it came to be called) of his wife’s hand. Scientists worldwide quickly began their own experiments with X-rays, and by 1900, X-ray was widely...

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Non-invasive 3D-Visualization with Sub-micron Resolution Using Synchrotron-X-ray-tomography
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Published on: May 27, 2008

Quantitative biological imaging by ptychographic x-ray diffraction microscopy.

Klaus Giewekemeyer1, Pierre Thibault, Sebastian Kalbfleisch

  • 1Institut für Röntgenphysik, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany. k.giewek@phys.uni-goettingen.de

Proceedings of the National Academy of Sciences of the United States of America
|December 19, 2009
PubMed
Summary
This summary is machine-generated.

Advanced ptychographic coherent diffractive imaging enables nanoscale imaging of biological specimens. This method allows for quantitative electron density mapping of freeze-dried bacterial cells, aiding in understanding their structure.

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Area of Science:

  • Microscopy
  • Biophysics
  • Nanotechnology

Background:

  • Coherent X-ray diffractive imaging (CXDI) has advanced nanoscale imaging.
  • Ptychographic CXDI offers improved sample preparation and illumination flexibility.
  • Biological microscopy requires high-resolution, quantitative imaging techniques.

Purpose of the Study:

  • To apply advanced ptychographic CXDI for nanoscale structure determination in biological microscopy.
  • To demonstrate quantitative imaging of unstained, freeze-dried bacterial cells.
  • To assess the potential for understanding bacterial nucleoid structure.

Main Methods:

  • Utilized an advanced implementation of ptychographic coherent diffractive imaging.
  • Applied the technique to freeze-dried cells of Deinococcus radiodurans.
  • Reconstructed phase information to derive projected electron density.

Main Results:

  • Achieved quantitative and reproducible electron density mapping of bacterial cells with small errors.
  • Demonstrated 85 nm resolution for bacterial cells and 50 nm for test structures.
  • Observed superresolution factors of ~15 for cells and ~30 for test structures at low radiation doses.

Conclusions:

  • Advanced ptychographic CXDI is a viable method for nanoscale biological imaging.
  • The technique facilitates straightforward, quantitative analysis of cellular structures.
  • This approach holds promise for advancing the study of bacterial nucleoid organization.