Today, the most diverse species of crocodile are found in northern South America and Southeast Asia: As many as six species of alligator and four true crocodiles exist, although no more than two or three ever live alongside one another at the same time. It was a different story nine to about five million years ago, however, when a total of 14 different crocodile species existed and at least seven of them occupied the same area at the same time, paleontologists say.

coniferr: Scientists are working on solving the roadkill problem. http://t.co/yRhoA7Watf http://t.co/KdcR7apgLD

coniferr: Scientists are working on solving the roadkill problem. http://t.co/yRhoA7Watf

A scientist has discovered an ancient extinct creature with 'scissor hand-like' claws in fossil records and has named it in honour of his favourite movie star.

DNA-tethered nanorods link up like rungs on a ribbonlike ladder—a new mechanism for linear self-assembly that may be unique to the nanoscale. Scientists at the U.S. Department of Energy's Brookhaven National Laboratory have discovered that DNA "linker" strands coax nano-sized rods to line up in way unlike any other spontaneous arrangement of rod-shaped objects. The arrangement-with the rods forming "rungs" on ladder-like ribbons linked by multiple DNA strands-results from the collective interactions of the flexible DNA tethers and may be unique to the nanoscale. The research, described in a paper published online in ACS Nano, a journal of the American Chemical Society, could result in the fabrication of new nanostructured materials with desired properties.

This image shows Matthias Hebrok, Ph.D., University of California, San Francisco. Raising hopes for cell-based therapies, UC San Francisco researchers have created the first functioning human thymus tissue from embryonic stem cells in the laboratory. The researchers showed that, in mice, the tissue can be used to foster the development of white blood cells the body needs to mount healthy immune responses and to prevent harmful autoimmune reactions.

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Designing wildlife habitats.
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QH76.5.M3 H65 2013

Life: the state of South Africa’s biodiversity 2012.
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QH77.S62 L53 2012

Report of the Expert Workshop on Greenhouse Gas Emissions Strategies and Methods in Seafood: Rome, 23-25 January 2012.
Expert Workshop on Greenhouse Gas Emissions Strategies and Methods. Rome: Food and Agriculture Organization of the United Nations, 2012. HOLLIS# 013675986
TD885.5.G73 E96 2012

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Human stem cells created by cloning

Nature 497, 7449 (2013). http://www.nature.com/doifinder/10.1038/497295a

Author: David Cyranoski

Breakthrough sets up showdown with induced adult lines.