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Astrocytes, like these in a slice from a rat brain, wrap the footlike ends of their branches around capillaries (arrow). The astrocytes collect nutrients from the bloodstream, which they pass on to neurons, and protect the brain from toxic agents.
Credit: Marie SimardPublished: April 7th, 2001; Vol.159 #14Found in: Biology -
A neuron grown in culture without glia (above) shows many fewer synapses (bright dots) than a neuron cultured with glia does (below).
Credit: Ullian and Karen ChristophersonPublished: April 7th, 2001; Vol.159 #14Found in: Biology -
Published: April 7th, 2001; Vol.159 #14Found in: Biology -
Published: Monday, April 2nd, 2001 -
Published: Friday, March 30th, 2001Found in: Numbers
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Hasse diagram for the divisors of 42.Published: Friday, March 30th, 2001Found in: Numbers -
Hasse diagram for a given poset and its corresponding geometric figure.Published: Friday, March 30th, 2001Found in: Numbers
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Home / News / March 31st, 2001; Vol.159 #13 / Touching legs turns shy locusts gregarious / a422_1623.JPG
The shy green form of a desert locust nymph (right) can switch into a multicolored crowd lover if jostled.
Credit: SwordPublished: March 31st, 2001; Vol.159 #13Found in: Biology -
Home / News / March 31st, 2001; Vol.159 #13 / Moon may radio cosmic rays' biggest hits / a421_126.JPG
Where the highest-energy cosmic rays graze the moon (light-gray area), microwaves may shoot Earthward.
Credit: Adapted from Peter W. Gorham/JPLPublished: March 31st, 2001; Vol.159 #13Found in: Physics -
Home / News / March 31st, 2001; Vol.159 #13 / Microbes put ancient carbon on the menu / a420_166.JPG
Ultraviolet light reveals kerogen-munching microbes (blue) surrounding fragments of organic material (orange) in this sample of New Albany shale.
Credit: SciencePublished: March 31st, 2001; Vol.159 #13Found in: Earth Science -
Home / News / March 31st, 2001; Vol.159 #13 / Bacterial cells reveal skeletal structures / a419_1546.jpg
A fluorescent tag for a specific bacterial protein reveals a helical skeleton.
Credit: Carballido-LópezPublished: March 31st, 2001; Vol.159 #13Found in: Biology -
Home / News / March 31st, 2001; Vol.159 #13 / Ancient tree rings reveal past climate / a418_1853.JPG
Researchers reconstructed ancient climate patterns by using tree stumps such as this one in Southern Chile.
Credit: RoigPublished: March 31st, 2001; Vol.159 #13Found in: Earth Science -
Home / News / March 31st, 2001; Vol.159 #13 / Ancient tree rings reveal past climate / a418_2521.JPG
Annual temperature and rain variations are reflected in growth rings.
Credit: RoigPublished: March 31st, 2001; Vol.159 #13Found in: Earth Science -
Graph shows the size of the cosmos over time as indicated by supernovas several billion light-years from Earth (white objects on right part of the curve) and the farthest known supernovas. If dust were dimming the nearby supernovas, the rate of expansion would fall instead along the orange dotted line.
Credit: Images: Space Telescope Science Institute/NASAPublished: March 31st, 2001; Vol.159 #13Found in: Astronomy -
Supernova 1997ff (right) and the galaxy in which it resides (arrow at left).Published: March 31st, 2001; Vol.159 #13Found in: Astronomy
