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Chemistry. (Science News of the year: the weekly newsmagazine of science).

Hydrogen generation Researchers experimented with more sustainable ways to generate hydrogen, which burns cleanly but is typically made from fossil fuel (162: 235 *).

Self-sutures Surgical sutures made from a new biodegradable material tie themselves into a knot and tighten as the material warms to body temperature (161: 262).

Nanotech concerns Scientists explored nanomaterials' possible negative consequences in the human body and the environment (161: 200 *).

Better batteries A new material could make rechargeable lithium-ion batteries smaller, cheaper, and safer (162: 196 *).

Money allergies Some of the new two-alloy European Union ex)ins release large amounts of nickel, a common skin irritant (162:163 *).

Viral parts Researchers transformed viruses into potential building blocks for electronic circuits and tools for biomedical therapies (161: 68).

Minimotor A single molecule performed mechanical work--pulling and releasing a cantilever tip--when exposed to light (161: 292).

Macro costs A new analysis revealed that the production of a single 2-gram microchip requires nearly 2 kilograms of chemicals and fossil fuels (162: 309).

Questions of origin Two studies of inks and paper renewed controversy about the authenticity of a map that some scholars claim is the first depiction of North America (162: 109).

Mimicking nature's binders A new technique made artificial receptors that differentiate among molecules that are similar to each other (162: 53).

Icy birth Two experiments simulating the environment of interstellar space produced amino acids, the building blocks of proteins (161: 195 *).

Molecular sorting A novel modification of polymer membranes gave researchers a means to tune certain filters to be more selective yet faster (161: 245). Other experiments suggested that a new membrane would make it easier to separate mixtures of the right-hand and left-hand versions of drug molecules (161: 388). A recently devised, metal-laced organic solid proved that it can act as a sieve for nanosize molecules (162: 213).

* An asterisk indicates that the text of the item is available free on SCIENCE NEWS ONLINE (http://www.sciencenews.org).
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Publication:Science News
Date:Dec 21, 2002
Words:323
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