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on the links below to see the larger images. |
Cells! is
produced by R. Howard Berg as an educational public service of the
Danforth Center. This tool makes available images of cellular
structures for use in teaching. Use the left-hand menu or browse
through the larger images below. The
images shown were produced using instrumentation in the
Integrated
Microscopy Facility
at the Danforth Center
and
illustrate a variety of cellular characteristics and structures.
You
may copy and use the images for educational purposes only, free of charge.
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Abbreviations:
G=Golgi stack; M=mitochondrion;
Mt=microtubule;
N=nucleus;
Nu=nucleolus; P=plastid;
Pl=plasma membrane; T=tonoplast;
V=vacuole;
W=plant cell wall |
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nuclear
pores |
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You can use the thumbnails
on the left
or click on the word(s) above to navigate to images.
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These images
are copyrighted to the Danforth Center and are not to be
sold
or published without the written permission of the Danforth
Center.
We would
like to acknowledge the support of the National Science
Foundation as the
source of funds to purchase the instruments used in making these
images.
Light micrographs were made
using a Zeiss LSM 5210 Meta NLO confocal/multiphoton
system and are of
living cells. |
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Electron
micrographs were made using a Leo 912 AB transmission electron
microscope.
These thin section images are of samples that were
physically fixed by ultra-rapid freezing
(about 15 milliseconds) in a
high pressure freezer, which prevents ice crystal formation
which
otherwise would destroy cell structure. Compared to chemical
fixation, ultra-rapid
fixation produces the most life-like images
currently possible in electron microscopy. |
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A transmission electron
micrograph of a highly lobed nucleus in a nematode-induced plant giant
cell. Some DNA is present as heterochromatin (dark patches), but
most is euchromatin (not condensed and present as thin fibers not easily
seen in thin sections). Arrows point to nuclear pores (one pore is
delineated by the two white arrows). These pores are openings in
the double-membraned nuclear envelope and contain a complex of over 100
proteins that regulate transport of macromolecules into and out of the
nucleus. The pore diameter is about 150 nanometers.
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