ScienceDaily: Top Science News |
- NASA Mars rover finds mineral vein deposited by water
- Changes in bioelectric signals trigger formation of new organs: Tadpoles made to grow eyes in back, tail
- Why does the same mutation kill one person but not another?
- One of the world's smallest electronic circuits created
- North America's biggest dinosaur revealed
- World's first super predator had remarkable vision
- Drug reverses aging-associated changes in brain cells, animal study shows
- Maternal care influences brain chemistry into adulthood, animal study shows
- Vampire star reveals its secrets
| NASA Mars rover finds mineral vein deposited by water Posted: 07 Dec 2011 03:20 PM PST NASA's Mars Exploration Rover Opportunity has found bright veins of a mineral, apparently gypsum, deposited by water. Analysis of the vein will help improve understanding of the history of wet environments on Mars.  |
| Posted: 07 Dec 2011 02:57 PM PST For the first time, scientists have altered natural bioelectrical communication among cells to directly specify the type of new organ to be created at a particular location within a vertebrate organism. Using genetic manipulation of membrane voltage in Xenopus (frog) embryos, biologists were able to cause tadpoles to grow eyes outside of the head area. The researchers achieved most surprising results when they manipulated membrane voltage of cells in the tadpole's back and tail, well outside of where the eyes could normally form.  |
| Why does the same mutation kill one person but not another? Posted: 07 Dec 2011 12:23 PM PST The vast majority of genetic disorders (schizophrenia or breast cancer, for example) have different effects in different people. Moreover, an individual carrying certain mutations can develop a disease, whereas another one with the same mutations may not. This holds true even when comparing two identical twins who have identical genomes. But why does the same mutation have different effects in different individuals?  |
| One of the world's smallest electronic circuits created Posted: 07 Dec 2011 10:29 AM PST Scientists have engineered one of the world's smallest electronic circuits. It is formed by two wires separated by only about 150 atoms or 15 nanometers.  |
| North America's biggest dinosaur revealed Posted: 07 Dec 2011 10:29 AM PST New research has unveiled enormous bones from North America's biggest dinosaur. Researchers collected two gigantic vertebrae and a femur in New Mexico. The bones belong to the sauropod dinosaur Alamosaurus sanjuanensis: a long-necked plant eater related to Diplodocus. The Alamosaurus roamed what is now the southwestern United States and Mexico about 69 million years ago.  |
| World's first super predator had remarkable vision Posted: 07 Dec 2011 10:29 AM PST Scientists working on fossils from Kangaroo Island, South Australia, have found eyes belonging to a giant 500 million-year-old marine predator that sat at the top of the earth's first food chain.  |
| Drug reverses aging-associated changes in brain cells, animal study shows Posted: 07 Dec 2011 08:35 AM PST Drugs that affect the levels of an important brain protein involved in learning and memory reverse cellular changes in the brain seen during aging, according to an animal study.  |
| Maternal care influences brain chemistry into adulthood, animal study shows Posted: 07 Dec 2011 08:30 AM PST The effect of the messenger substance neuropeptide Y depends on the behavior of the mother during infancy.  |
| Vampire star reveals its secrets Posted: 07 Dec 2011 07:54 AM PST Astronomers have obtained the best images ever of a star that has lost most of its material to a vampire companion. By combining the light captured by telescopes at the European Southern Observatory's Paranal Observatory they created a virtual telescope 130 meters across with vision 50 times sharper than the NASA/ESA Hubble Space Telescope. Surprisingly, the new results show that the transfer of mass from one star to the other in this double system is gentler than expected.  |
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