The medicines work by affecting molecular switches that control the entry of sugar and fat into cells.

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As for the liquid lens, Nippon Electric Glass' version uses low-power electric field to control its liquid crystal molecular orientation, thus changing the focal point.

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Damage that occurs at the cellular or molecular level can disrupt the body's natural control processes and allow an uncontrolled growth of cells, or cancer.

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"The disease is common, but the fatalities are the puzzle we're trying to figure out, " says Dr. Jim Alexander, a molecular virologist with the Atlanta-based Centers for Disease Control and Prevention.

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Ptacek and his colleagues foresee ways in which understanding the molecular action of PTCy could lead to new ways to control the food clock and regulate metabolism despite shifts in the timing and amount of calories ingested.

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"We need to focus on creating molecular cocktails that can be administered over a long period of time to help patients control cancer, " says Leung.

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Using new genetic techniques such as molecular mapping, they have located a set of genes on one chromosome that appears to control the process in a grass species called Tripsacum.

ECONOMIST: Terminator genes

Because it allows precise control of the activation or silencing of genetic traits, Dr Greenland and others are testing their molecular switches on such properties as insect or fungal resistance.

ECONOMIST: Terminator genes