X
X-ray crystallography The use of X-ray
diffraction to determine the structure of crytals or molecules.
The technique involves directing a beam of X-rays at a crytalline
sample and recording the diffracted X-rays on a photographic
plate or through a detector to a data base. The diffraction
pattern consists of a pattern of spots on the plate, and
the crystal structure can be worked out from the positions
and intensities of the diffraction spots.
See also x-ray
crystallography |
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This movie is a compilation of actual x-ray diffraction
data from a crystal of GCN4-N16A peptide in P3121. Each
frame is a 1-degree oscillation.
Movie is courtesy of James Holton
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| X-ray diffraction
The diffraction of X-rays by a crystal. The
wavelengths of X-rays comparable in size to the distances
between atoms in most crystals, and the repeated pattern of
the crystal lattice acts like a diffraction grating for X-rays.
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x-ray (x-ray radiation) Electromagnetic
radiation with wavelengths between approximately .01 nanometers
to 200 nanometers. These energy beams are powerful enough to penetrate
most substances except heavy metals (such as gold and lead).
X-rays are used to examine body parts; the x-rays are absorbed
by tissues containing lots of calcium (bones, teeth, etc.) and
thus x-ray films are useful for detecting fractures, misalignments,
abnormal cavities, etc.
Web Author: Tug Sezen
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