ScienceDaily: Top Science News |
- Remote wilderness polluted by humans
- Detecting the 'heartbeat' of smallest black hole candidate
- Tiny protein helps bacteria 'talk' and triggers defensive response in plants
| Remote wilderness polluted by humans Posted: 16 Dec 2011 08:25 AM PST Nitrogen from human activity has been polluting lakes in the northern hemisphere since the late 19th century. The clear signs of industrialization can be found even in very remote lakes, thousands of kilometers from the nearest city.  |
| Detecting the 'heartbeat' of smallest black hole candidate Posted: 15 Dec 2011 08:27 PM PST Astronomers have identified a candidate for the smallest-known black hole using data from NASA's Rossi X-ray Timing Explorer (RXTE). The evidence comes from a specific type of X-ray pattern, nicknamed a "heartbeat" because of its resemblance to an electrocardiogram. The pattern until now has been recorded in only one other black hole system.  |
| Tiny protein helps bacteria 'talk' and triggers defensive response in plants Posted: 12 Dec 2011 07:09 PM PST Scientists have discovered a new signal that helps invading bacteria communicate but also helps targeted rice plants coordinate defensive attacks on the disease-causing invaders, a finding that could lead to new methods of combating infection not just in plants, but in humans.  |
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