Credit: Arpat Ozgul
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A new study reveals more about how axolotls, a type of salamander, regenerate lost limbs. Scientists had thought that primitive, undifferentiated pluripotent stem cells gave rise to the new tissue. Now, researchers show that cells at the wound site retain their identity and give rise to the same cell types in the regrown limb. In a regenerated axolotl limb, shown here, scientist used green fluorescent protein to track the origins of the new growth. GFP-labeled Schwann cells from the original limb gave rise to the GFP-labeled Schwann cells visible here, which are wrapped around non-labeled nerv...
Credit: Dunja Knapp and Elly Tanaka -
Overall, the ozone hole over Antarctica boosts wind speeds over the surrounding oceans, according to new model simulations. Yellow indicates where wind speeds increased the most in a scenario with an ozone hole compared to one without the hole. Bright blue shows where wind speeds declined the most.
Credit: Lenton et al./Geophysical Research Letters -
This snapshot of a state-of-the-art simulation shows the flow of gas into a fledgling galaxy. Streams of cold gas (blue) flow onto the edge of the fledgling galaxy’s disk, while shock-heated gas (red) surrounds the disk. Gas enriched in metal content (green) by supernova explosions is stripped from smaller galaxies interacting with the hot dark matter halo and the cold gas stream.
Credit: B. Moore, Oscar Agertz and Romain Teyssier/University of Zurich - See More Sights And Sounds

