Uncategorized
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19213
This article says that in cavitation, “bubbles form when falling pressure permits dissolved gases to pop out of solution.” A cavitation-vapor bubble is formed when the pressure drops below the vapor-liquid saturation pressure for the liquid. Dissolved gas bubbles will just give you a fizzy cola. A.J. McPhateBaton Rouge, La.
- Astronomy
Hubble Weighs In: Pinning down an extrasolar planet’s mass
Using a decades-old technique, astronomers have precisely measured the mass of a planet outside our solar system.
- Materials Science
Nanotube ID: New signatures aid nanotech progress
Researchers have developed a means for rapidly distinguishing among 33 semiconducting varieties of carbon nanotubes.
- Health & Medicine
Cluster Bombs: Metabolic syndrome tied to heart disease deaths
Men with a certain cluster of metabolic characteristics are about three times as likely to die of heart disease as men without the traits are.
- Animals
Frogs Play Tree: Male tunes his call to specific tree hole
Borneo's tree-hole frog may come as close to playing a musical instrument as any wild animal does. [With audio file.]
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19212
It’s no surprise to find that the Borneo tree frog tunes into his tree hole. From the resonance of electron shells to the orbits of planets, stars, and galaxies, harmonic relationships define all of creation. Many frogs have external tympanic membranes that resonate to their tiny chirpings. This mechanism helps put entire ponds full of […]
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19211
This article recommended shock absorbers and cushioned seats. Did this study survey what type of bikes the volunteers rode? Doug LandonSimi Valley, Calif. Study coauthor Ferdinand Frauscher notes that although most of the long-time bikers now use bikes with shock absorbers and padded seats, they almost all originally rode bikes with little or no padding […]
- Health & Medicine
Jarring Result: Extreme biking can hurt men’s fertility
Men who maintain grueling mountain-bicycling programs are apt to have lower sperm counts than nonbikers are.
- Anthropology
Script Delivery: New World writing takes disputed turn
Researchers announced, to considerable controversy, that inscriptions found on artifacts at an Olmec site in southeastern Mexico represented the earliest known writing system in the Americas.
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Debate over Alzheimer’s enzyme flares up
Scientists continue to tussle over the identity of an enzyme implicated in Alzheimer's disease.
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19210
Contrary to your article, animal cells do not possess “cell walls,” as suggested by “proteases are usually much smaller and don’t inhabit cell walls.” Plants have cell walls; animal cells are bound by a single lipid bilayer membrane. David Winialski Tallahassee, Fla.
- Earth
Algal bloom is smothering Florida coral
The anomalous growth of a native alga—now blanketing the seabed in a huge swath off the southern coast of Florida—points to overfertilization with upwelling sewage.
