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tagged proteins anchored to a vesicle membraneOrganizing synthetic cells

With a tag, an anchor and a cage that can be unlocked with light, chemists have devised a simple, modular system that can locate proteins at the membrane of a cell.

“If you’re trying to emulate the way nature does this, you need a lot of complex machinery,” said Andrew Rudd, a graduate student in chemistry and biochemistry.

Rudd sought something simpler. He works with Neal Devaraj, an assistant professor of chemistry and biochemistry whose group has been working toward the creation of artificial cells from scratch in part by finding minimal ways to create biological structures. More.

NIROSETI team with their instrument inside the Lick Observatory domeAstronomers extend search for extraterrestrials to new realms

The search for extraterrestrial intelligence has expanded into a new realm with a new instrument tuned to infrared light.

"Infrared light would be an excellent means of interstellar communication," said Shelley Wright, assistant professor of physics at the University of California, San Diego who led the development of the new instrument.

Pulses from a powerful infrared laser could outshine a star, if only for a billionth of a second. Interstellar gas and dust is almost transparent to near infrared, so these signals can be seen from greater distances. It also takes less energy to send the same amount of information using infrared signals than it would with visible light.

Scientists have searched the heavens for radio signals for more than 50 years and expanded their search to the optical realm more than a decade ago. But instruments capable of capturing pulses of infrared light have only recently become available.

"We had to wait," Wright said, for technology to catch up. "I spent eight years waiting and watching as new technology emerged."

Photo © Laurie Hatch

highly connected data structure on which quantum search would slow
Data structures influence speed of quantum search in unexpected ways

Quantum computers will be able to find target items within large piles of data far faster than conventional computers though the speed of the search will likely depend on the structure of the data.

Intuition says that the search would be fastest in a highly connected database, but a new analysis found counterexamples of slowed search on a highly connected structure and fast search on a sparsely connected one.

More.


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