Actions in case of severe freezing. Tourist tips

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Actions in case of severe freezing. Tourist tips

Tourist tips

With a strong freezing hands put on gloves and, bending over, swing your arms back and forth with a period of about 1 second. Warm up cold feet the same way.

Make as wide and energetic swings as possible.

With a long general hypothermia shock may suddenly occur - a temporary loss of consciousness. It is necessary to act quickly - seat the victim and throw on him warm clothes that are at hand (no need to put on sleeves - time is precious!).

Upon the return of consciousness, give sugar, glucose, wine, smell ammonia.

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Metal with unusual optical properties 26.06.2009

Chirality - the incompatibility of the molecular structure of a substance with its mirror image - is inherent in many organic substances. Optical isomers of such substances polarize light differently. For metals, no one noticed such an ability. This is understandable: their lattices are quite symmetrical.

However, Gadi Rotenberg, a professor at the University of Amsterdam, managed to make chiral palladium. To do this, he used the simplest method of metal reduction from its salt in the presence of short molecules of the optical isomer, in this case cinchona alkaloid. When the organics were removed, a black powder of palladium was obtained, which has the property of chirality.

Moreover, even mechanical processing did not destroy this property: using a 10-ton press, scientists forged a disc the size of a coin in two European cents and sent it for testing to Israel, to the Weizmann Institute of Science. There, they checked the photoelectric effect inherent in palladium and found that the number of electrons knocked out of a metal disk depends on the polarization of the incident light.

"I am sure that chiral metals will become the basis of fundamentally new catalysts," says Prof. Rotenberg.

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