Washington, D.C. - In a presentation today (Aug. 19) to the American Chemical Society meeting, Ankit Agarwal, a postdoctoral researcher at the University of Wisconsin-Madison, described an experimental approach to wound healing that could take advantage of silver's anti-bacterial properties, while sidestepping the damage silver can cause to cells needed for healing.
Silver is widely used to prevent bacterial contamination in wound dressings, says Agarwal, "but these dressings deliver a very large load of silver, and that can kill a lot of cells in the wound."
An Australian senior police officer has claimed that there should be a debate as to whether the internet should be switched off.
Australia's IT News reported that Brian Hay, detective superintendent for fraud and corporate crime at the Queensland Police, told ABC's current affairs program Four Corners that he expected to see a debate on switching off the internet.
Speaking on a programme titled 'Fear in the Fast Lane', Hay said: "I expect to see at some stage in the future there will be real debate on the benefit of the internet; should we turn it off?"
The program focused on the ease at which computers could be infected with malware and then controlled by organised criminal gangs to commit online crimes. It featured victims of phishing scams, with one claiming that he had lost over $80,000 after clicking on a link on a phishing email.
The race is on to discover a second Earth
IN 1995, when Michel Mayor of the University of Geneva detected the first exoplanet (a planet that orbits a star other than the sun) he started a race that has gained pace ever since. Some 360 such planets have now been detected, but none is exactly equivalent to the Earth.
The closest so far is Gliese 581c, which was discovered in 2007 by Dr Mayor's colleague, Stéphane Udry. It is both rocky and orbits its parent star at a distance where liquid water could reasonably be expected to exist. However, since its parent star is a red dwarf - a far smaller and fainter object than the sun - that orbit is, in fact, much smaller that the Earth's around the sun. That, in turn, suggests Gliese 581c is likely to be tidally locked to its orbital period, so that one side of the planet always faces the star and the other never does. Having half a planet in permanent daylight and the other half in permanent darkness does not sound like a good recipe for life.
The death of composer Wolfgang Amadeus Mozart at the age of 35 may have been caused by complications stemming from strep throat, according to a Dutch study published on Monday. Since the composer's death in 1791, there have been various theories about the cause of his untimely end, from intentional poisoning, to rheumatic fever, to trichinosis, a parasitic disease caused by eating raw or undercooked pork.
On his death certificate it was officially recorded that the cause of death was hitziges Frieselfieber, or "heated miliary fever," referring to a rash that looks like millet seeds.
But researchers from the University of Amsterdam in the Netherlands said studies on his death have generally been based on less-than-reliable evidence, like accounts from people who witnessed Mozart's final days, written decades after his death.
This morning in Iran, Venus and the Moon got together and with their combined luminosity rivaled the city lights of Tehran itself. Oshin D. Zakarian sends this photo from a hilltop overlooking the city:
© Oshin D. Zakarian
"The elegant crescent Moon was only 3 degrees away from dazzling Venus in the morning sky," says Babak Tafreshi who admired the view alongside Zakarian. "The pair were visible even through clouds."
© Ken GarrettThe kings of Copán built their temples one on top of the other, leaving parts of the old buildings inside the new structures. For 20 years, archaeologist Ricardo Agurcia has tunneled into these temples, where he recently discovered a king's tomb.
A new royal Maya tomb emerges from the tunnels beneath Copán's Acropolis.
The Maya kings of Copán were not interested in moving mountains. They preferred to build their own, like the pyramid now known as Temple 16. Rising 100 feet above the city's Great Plaza, it is the highest point among a group of holy buildings that archaeologists have dubbed "the Acropolis." Inside an excavation tunnel deep beneath the pyramid's surface, the face of the sun-king scowls at me from the wall of his temple. The city's ancient rulers built their temples--one on top of the next--to suit the needs of the moment. The moment I am visiting occurred shortly after A.D. 540 when the first of four temples was built around a small plaza at the top of the Acropolis.
Scientists have used a new vaccine production technology to develop a vaccine for norovirus, a dreaded cause of diarrhea and vomiting that may be the second most common viral infection in the United States after the flu. Sometimes called the "cruise ship virus," this microbe can spread like wildfire through passenger liners, schools, offices and military bases.
The new vaccine is unique in its origin - it was "manufactured" in a tobacco plant using an engineered plant virus. Researchers are enlisting plants in the battle against norovirus, swine flu, bird flu, and other leading infectious diseases. This plant biotechnology opens the door to more efficient, inexpensive ways to bring vaccines quickly to the public, especially critical in times when viruses mutate into unpredictable new strains, said Charles Arntzen, Ph.D., who reported on the topic today at the 238th National Meeting of the American Chemical Society (ACS).
Durham, N.C. - Naturally occurring organic matter in water and sediment appears to play a key role in helping microbes convert tiny particles of mercury in the environment into a form that is dangerous to most living creatures.
This finding is important, say Duke University environmental engineers, because it could change the way mercury in the environment is measured and therefore regulated. This particularly harmful form of the element, known as methylmercury, is a potent toxin for nerve cells. When ingested by organisms, it is not excreted and builds up in tissues or organs.
© Christopher Go
Four hundred years ago when Galileo discovered the moons of Jupiter, the satellites appeared in his primitive telescope as tiny, almost infinitesimal specks of light pirouetting around the giant planet. Their discovery transformed 17th century cosmology and made Galileo famous, but he never saw them as anything more than star-like pinpricks. The "Galilean satellites" were second-class citizens in the heirarchy of known worlds. What would Galileo say now?
On August 16th, Philippine astrophotographer Christopher Go used a modern 11-inch Celestron telescope to photograph Io casting its shadow on Ganymede. Click
here to launch the movie.
Scientists in Israel have demonstrated that it is possible to fabricate DNA evidence, undermining the credibility of what has been considered the gold standard of proof in criminal cases.
The scientists fabricated blood and saliva samples containing DNA from a person other than the donor of the blood and saliva. They also showed that if they had access to a DNA profile in a database, they could construct a sample of DNA to match that profile without obtaining any tissue from that person.
