Uncategorized
- Tech
Reaction in Hand: Microreactor produces radioactive probe in a jiffy
A miniature chemical reactor that whips up a diagnostic tool could widen the availability of positron-emission tomography (PET) scans.
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Shades of Flesh Tone: Tests reveal gene for people’s skin color
Researchers have identified a gene that they propose plays a major role in determining a person's skin color.
- Earth
TB Dilemma: Badger refugees complicate culling
Two new analyses bring an ironic twist to the heated debate over whether badgers in Britain should be killed to prevent them from spreading tuberculosis among cattle.
- Earth
Glacial Change: Greenland’s ice loss doubled in 2005
A host of observations suggests that Greenland's ice sheet diminished this year at a rate more than twice that seen just a few years ago.
- Health & Medicine
Shots often don’t reach muscle
Standard 3-centimeter needles are too short to penetrate the layer of fat in the buttocks of most women and most obese men, so injected medications aimed at muscle often don't reach their targets.
- Health & Medicine
New software aids virtual colonoscopy
A computer program helps radiologists spot dangerous growths in the colon without probing inside the body.
- Astronomy
Dark shadows
New radio telescope images of the center of the Milky Way make an even more compelling case that a supermassive black hole resides there.
- Earth
Microbe polishes off pollutant
Researchers have determined how long a pesticide residue would remain in the environment if the microbe Pseudomonas pavonaceae didn't metabolize it.
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19621
This article raises the question of how oxygen levels have changed over the past 2 centuries, when carbon dioxide has been increasing. John MillsDecatur, Ala. There is a problem in this interesting article. The graph of oxygen content versus time doesn’t agree with the text. Specific example: “About 255 million years ago … the oxygen […]
- Earth
Changes in the Air
Changes in the atmospheric concentration of oxygen through geologic time, some gradual and some drastic, have strongly shaped evolution among many types of creatures.
- Math
Surface Story
Mathematicians have zeroed in on a new type of minimal surface based on a double helix.
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