Chronos is one of the many Smalltalk-related blogs syndicated on Planet Smalltalk
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Discussion of the Essence# programming language, and related issues and technologies.

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2009-10-15

Powerhouses in the cell dismantled

From PhysOrg.com:

Kris Gevaert from VIB/Ghent University (Belgium) and colleagues from the universities of Freiburg and Bochum have achieved a breakthrough in protein research. Using yeast, they have succeeded in making virtually the complete inventory of all the proteins in the mitochondria, the energy producers found in every cell. Their research findings are being published in Cell.
Full article


2009-10-14

What drives our genes? Researchers map the first complete human epigenome

From PhysOrg.com:

Although the human genome sequence faithfully lists (almost) every single DNA base of the roughly 3 billion bases that make up a human genome, it doesn't tell biologists much about how its function is regulated. Now, researchers at the Salk Institute provide the first detailed map of the human epigenome, the layer of genetic control beyond the regulation inherent in the sequence of the genes themselves.
Full article


Scientists use math modeling to predict unknown biological mechanism of regulation

From PhysOrg.com:

"Thanks to the Human Genome Project, biology and medicine today may be at a point similar to where physics was after the advent of the telescope," said Orly Alter, assistant professor of biomedical engineering at the university. "The rapidly growing number of large-scale DNA microarray data sets hold the key to the discovery of cellular mechanisms, just as the astronomical tables compiled by Galileo and Tycho after the invention of the telescope enabled accurate predictions of planetary motions and, later, the discovery of universal gravitation. And just as Kepler and Newton made these predictions and discoveries by using mathematical frameworks to describe trends in astronomical data, so future discovery and control in biology and medicine will come from the mathematical modeling of large-scale molecular biological data."
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2009-10-13

Researchers create molecular diode

From PhysOrg.com:

The project's results raise the prospect of building single molecule diodes - the smallest devices one can ever build. "I think it's exciting because we are able to look at a single molecule and play with it, " Tao says. "We can apply a voltage, a mechanical force, or optical field, measure current and see the response. As quantum physics controls the behaviors of single molecules, this capability allows us to study properties distinct from those of conventional devices."
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2009-10-09

Quantum computing may actually be useful, after all

From PhysOrg.com:

In recent years, quantum computers have lost some of their luster. In the 1990s, it seemed that they might be able to solve a class of difficult but common problems — the so-called NP-complete problems — exponentially faster than classical computers. Now, it seems that they probably can't. In fact, until this week, the only common calculation where quantum computation promised exponential gains was the factoring of large numbers, which isn't that useful outside cryptography.
Full article


2009-10-07

Atomic Wire with Protective Sheath: Stable Metal Nanowires One Atom Wide Inside Carbon Nanotubes

From PhysOrg.com:

Japanese researchers working with R. Kitaura and H. Shinohara have now developed a new method that is simple and delivers stable nanowires: They deposit metal atoms inside of carbon nanotubes. As the scientists report in the journal Angewandte Chemie, this forms metal wires of individual atoms lined up side-by-side that are so well protected by their sheath that they have long-term stability.
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Scientists discover quantum fingerprints of chaos

From PhysOrg.com:

Until now, no one has produced experimental evidence that chaos occurs in the quantum world, the world of photons, atoms, molecules and their building blocks.
...
Now, however, Jessen and his group in UA's College of Optical Sciences have performed a series of experiments that show just how classical chaos spills over into the quantum world.
Full article


Physicists Demonstrate Three-Color Entanglement

From PhysOrg.com:

For the first time, physicists have demonstrated the quantum entanglement of three light beams, all of different wavelengths. Entanglement of two light beams of different wavelengths has already been demonstrated, but the researchers explain that going beyond two beams is important since three beams can serve as connections at the nodes of a quantum network.


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2009-10-06

Invisible hand in invisible matter

From PhysOrg.com:

An international team of astronomers have found an unexpected link between mysterious 'dark matter' and the visible stars and gas in galaxies that could revolutionise our current understanding of gravity.
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2009-10-05

Filming photons, one million times a second

From PhysOrg.com:

European researchers have created a CMOS (semiconductor) camera capable of filming individual photons one million times a second. The breakthrough will impact on all the most advanced areas of science and makes Europe the world leader in the technology.
Full article