Tag: biology

New research suggests that a body-snatching parasitic fly might be the culbrit in the decline of the honeybee population in the U.S.

1:21 pm

Alien on Earth: New research suggests that a body-snatching parasitic fly might be the culprit in the decline of the honeybee population in the U.S.

The parasitic fly lays eggs in a bee’s abdomen. Several days later, the parasitized bee bumbles out of the hives—often at night—on a solo mission to nowhere. These bees often fly toward light and wind up unable to control their own bodies. After a bee dies, as many as 13 fly larvae crawl out from the bee’s neck. The bees’ behavior seems similar to that of ants that are parasitized—and then decapitated from within—by other fly larvae from the Apocephalus genus.

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Scientists last week published a paper claiming that the Fukushima nuclear reactor meltdown caused 14,000 U.S. deaths.

9:53 pm

Junk science: Scientists last week published a paper claiming that the Fukushima nuclear reactor meltdown caused 14,000 U.S. deaths. You can download the paper here [pdf].

I expect the mainstream television press to push this story in the coming days. The story however is crap. I’ve read the paper, and all it shows is a small statistical increase in deaths in the fourteen weeks after the earthquake/meltdown, compared to the previous year. The scientists provided no context with other years, nor did they factor in changes in total population or a host of innumerable other variables that would influence these numbers. Worse, they presented no direct evidence linking the fallout from the meltdown with the deaths.

In other words, this is agenda-driven science, designed mainly to attack nuclear energy. We should not give it much credence.

One more point: the lead author of the paper is the executive director of Radiation and Public Health Project, an organization whose only purpose appears to be to prove that low level radiation has a negative effect on human health. From a science perspective, this is not a good way to do science. The only way the scientists in this organization can justify their fund-raising and research is to find evidence to prove their theory.

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For as yet unexplained reasons, scientists have been finding isolated colonies of little brown bats — once the most common bat species in the region and the hardest hit by white nose syndrome — surviving and healthy.

2:42 pm

Hope for North America’s bats: For as yet unexplained reasons, scientists have been finding isolated colonies of little brown bats — once the most common bat species in the region and the hardest hit by white nose syndrome — surviving and healthy.

In Vermont, biologists have identified 15 colonies in the western part of the state where the numbers of little brown bats, while still far fewer than before white nose appeared, are surviving, said Vermont Fish and Wildlife Biologist Scott Darling. “We visited each and every one of those colonies and to some degree, much to our surprise, they seem to be healthy,” Darling said. “It begged the question, ‘Why are you the lucky ones?'”

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Scientists have found microbes inside a lava tube that can thrive in the freezing cold and low oxygen environment of Mars.

9:40 pm

Scientists have found microbes inside a lava tube that can thrive in the freezing cold and low oxygen environment of Mars.

In a laboratory setting at room temperature and with normal oxygen levels, the scientists demonstrated that the microbes can consume organic material (sugar). But when the researchers removed the organic material, reduced the temperature to near-freezing, and lowered the oxygen levels, the microbes began to use the iron within olivine – a common silicate material found in volcanic rocks on Earth and on Mars – as its energy source.

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A crab that grows its own food

9:08 am

A crab that grows its own food.

In the deep ocean off the coast of Costa Rica, scientists have found a species of crab that cultivates gardens of bacteria on its claws, then eats them. The yeti crab — so-called because of the hair-like bristles that cover its arms — is only the second of its family to be discovered. The first — an even hairier species called Kiwa hirsuta — was found in 2005 near Easter Island.

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Over-the-counter osteoporosis drug appears to keep astronauts from losing bone density on long space flights

10:14 am

Big news: New research on ISS now shows that the standard over-the-counter osteoporosis drugs used by millions on Earth appears to keep astronauts from losing bone density during long space flights.

Beginning in 2009, the group administered the drug to five long-stay astronauts on the International Space Station (ISS), including Koichi Wakata, 48, and Soichi Noguchi, 46. The five took the drug — an over-the-counter bisphosphonate used to treat osteoporosis — once a week starting three weeks before they lifted off until they returned to Earth. The researchers then monitored the astronauts’ bone mass over time and compared the results to those for 14 astronauts that had never taken the drug.

The results showed that the 14 who had never taken the drug had average bone density loss of 7 percent in the femur, and 5 percent in the hip bone. The five astronauts on bisphosphonate, however, only had average bone density loss in the femur of 1 percent, and even a 3 percent increase in the hip bone. Calcium levels in their urine, which rise the more bone mass is lost, were also very low.

If these results hold up, they might very well solve one of the biggest challenges faced by any interplanetary traveler. Up until now, bone loss during long weightless missions never seemed to average less than 0.5 percent per month. After spending three years going to and from Mars, an astronaut could thus lose about almost 20 percent of their bone mass in their weight-bearing bones, and would probably be unable to return to Earth.

Thus, a mission to Mars seemed impossible, unless we could build a ship with some form of artificial gravity, an engineering challenge we don’t yet have the capability to achieve.

If these already tested drugs can eliminate this problem, then the solar system is finally open to us all. All that has to happen now is to do some one to two year manned missions on ISS to test the drugs effectiveness for these long periods of weightlessness.

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A new study has been released detailing the vision problems experienced by astronauts on space flights longer than six months

3:28 pm

A new study has been released detailing the vision problems experienced by astronauts on space flights longer than six months. Hat tip to Clark Lindsey.

The visual system changes discovered by the researchers may represent a set of adaptations to microgravity. The degree and type of response appear to vary among astronauts. Researchers hope to discover whether some astronauts are less affected by microgravity and therefore better-suited for extended space flight, such as a three-year round trip to Mars.

In their report, Drs. Mader and Lee also noted a recent NASA survey of 300 astronauts that found that correctible problems with both near and distance vision were reported by about 23 percent of astronauts on brief missions and by 48 percent of those on extended missions. The survey confirmed that for some astronauts, these vision changes continue for months or years after return to Earth.

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The cause of white nose, the killer of bats

11:14 am

Scientists today confirmed that the fungus, Geomyces destructans, causes white nose syndrome, the deadly killer that has been wiping out cave-hibernating bats throughout the eastern United States.

A science team led by David Blehert of the National Wildlife Health Center in Madison, Wisconsin captured healthy little brown bats and infected them with the fungus while they were in hibernation, some by direct application and others by putting them in contact with already infected bats. After 102 days, all of the first group had developed white nose on their muzzles and wings, while 16 of 18 of the second group had become infected as well.
» Read more

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Eradicating polio: not this year

8:35 am

The effort to eradicated polio entirely by the end of 2012 will not be met.

Afghanistan and Nigeria, two of the three remaining endemic countries, have had more cases in the first nine months of this year than in 2010 altogether. Several other countries targeted by the plan have also seen more cases to date this year compared to this time in 2010. Additionally, polio had popped up in countries where it had previously been eradicated — notably China, which went polio-free for 11 years until this summer.

Sadly, politics and culture are almost certainly the main reasons polio still survives in these countries.

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