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to Katherine Langley on her wedding, which took place in St. Catharine's College
on December 15, 2001.
to Paul Midgley on his promotion to a Senior Lectureship in the Dept.
Magnetite morphology and life on Mars
P R Buseck, R E Dunin-Borkowski, B Devouard, R B Frankel, M R McCartney, P A Midgley, M Posfai and M Weyland
Proc. Nat. Acad. Sci. 98 (2001), 13490-13495.
The above paper, which reexamines NASA's evidence about the
former presence of life on Mars, was published in the Proceedings
of the National Academy of Sciences on November 22, 2001. NASA's original work is
based on a comparison of bright
field TEM images of magnetite nanocrystals found in a meteorite from Mars with biogenic magnetite nanocrystals formed by terrestrial bacteria.
paper illustrates the application of electron tomography
to provide three-dimensional images of such nanocrystals
from tilt series of annular dark field images. The figure on the right shows one of our results from a bacterial
magnetite nanocrystal. The three-dimensional shape of the crystal is
shown from several directions. The work was mentioned on the following websites:
| ABC News
| Le Monde
| Washington Times
| LA Times
| Florida Today
| Globe and Mail (Toronto)
| Geological Society
| Science News Network
| Planetary Society
| Spaceflight now
| Blindfools (!)
The NASA response can be seen at Spaceref.
to see the abstract of the paper on the journal website.
to download the paper in pdf format [722 kB ].
of Science competition 2001
Two electron micrographs that Rafal Dunin-Borkowski submitted to the 'Science close-up' category of the Daily Telegraph/
Novartis Visions of Science 2001 competition were highly commended. The award ceremony was held at the
Royal Society on September 18, 2001.
The first image on the right is entitled 'Crystal in a nanotube'. It shows a surface
plot created from a focal series of high-resolution images of a single walled carbon nanotube that
contains a single crystal of potassium iodide just three atoms wide.
The sharp peaks show the regular arrangement of the atoms in the crystal.
This work was carried out with Jeremy Sloan and John Hutchison from Oxford and
Rudi Meyer and Angus Kirkland from Cambridge.
The second image on the right
shows the magnetic field lines in a single bacterial cell. The fine white lines are the magnetic field lines
in the cell, which were measured using off-axis
electron holography. Such bacteria live in sediments and bodies of water, and move parallel to geomagnetic
field lines as a result of the torque exerted on their magnetosome chains
by the earth's magnetic field.
This work was carried out in collaboration with Professor
Richard Frankel from California Polytechnic State University.
to see the story on the Cambridge University website.
to access the Visions of Science website.
The images formed part of a national exhibition,
and the story was featured in CAM magazine,
News and the Cambridge Network.
to Matthew Weyland on being awarded a fellowship from the Royal Commission for
the Exhibition of 1851.
This award will allow Matthew to continue his research in Cambridge for a further
two years. Only six such awards are made each year.
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