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PostSubject: It’s (Almost) Alive! Scientists Create a Near-Living Crystal   Fri Feb 01, 2013 10:01 am

Three billion years after inanimate chemistry first became animate life, a newly synthesized laboratory compound is behaving in uncannily lifelike ways.

The particles aren’t truly alive — but they’re not far off, either. Exposed to light and fed by chemicals, they form crystals that move, break apart and form again.

“There is a blurry frontier between active and alive,” said biophysicist Jérémie Palacci of New York University. “That is exactly the kind of question that such works raise.”

Palacci and fellow NYU physicist Paul Chaikin led a group of researchers in developing the particles, which are described Jan. 31 in Science as forming “living crystals” in the right chemical conditions.

Their experiments are rooted in the researchers’ interest in self-organizing collective behaviors, which are easier to study in controlled particle form than in schooling fish or flocking birds.

Each particle is made from a microscopic cube of hematite, a compound consisting of iron and oxygen, sheathed in a spherical polymer coat. One corner is left exposed.

Under certain wavelengths of blue light, hematite conducts electricity. When the particles are placed in a hydrogen peroxide bath under blue light, chemical reactions catalyze around the exposed tips.

more here: Wired

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