Friedrich Schiller University Jena researchers develops molecular computer using sugar

Researchers develop molecular computer using sugar

6:06 AM, 24th June 2014
researchers develops molecular computer using sugar
Chemist Martin Elstner from jena University and his colleagues use fluorescent sugar sensors for information processing. © Jan-Peter Kasper/FSU.

JENA, GERMANY: Researchers at Friedrich Schiller University Jena, Germany have developed the ‘sweetest computer in the world.’ The computer uses sugar molecules as a part of the chemical sequence for information processing. Professor Dr Alexander Schiller works at a rectangular plastic board with 384 small wells. The chemist carefully pipets some drops of sugar solution into a row of the tiny reaction vessels. As soon as the fluid has mixed with the contents of the vessels, fluorescence starts in some of the wells.

The chemist of Jena University and his two postgraduate students, Martin Elstner and Jorg Axthelm recently described in the new edition of the science journal ‘Angewandte Chemie International Edition’ how they developed a molecular computer on the basis of sugar.

“The binary logic which makes a conventional computer chip work is based on simple yes/no-decisions. There is either electricity flowing between both poles of an electric conductor or there isn’t,” explained Schiller. These potential differences are being coded as ‘0’ and ‘1’ and can be linked via logic gates - the Boolean operators like AND, OR, NOT. In this way, a number of different starting signals and complex circuits are possible.

Chemical reactions linked with computer algorithms can be realized with the help of chemical substances, as the Jena chemists were able to show. For their ‘sugar computer’ they use several components: One fluorescent dye and a so-called fluorescence quencher. “If there are both components involved, the colorant can’t display its impact and we don’t see a fluorescence signal,” said Schiller. But if sugar molecules are involved, the fluorescence quencher reacts with the sugar and thus loses its capability to suppress the fluorescence signal, which makes the dye fluorescent. Depending on whether the dye, the fluorescence quencher and the sugar are on hand to give the signal, a fluorescent signal results – ‘1’ - or no signal – ‘0.’

“We link chemical reactions with computer algorithms in our system in order to process complex information. If a fluorescence signal is registered, the algorithm determines what goes into the reaction vessel next,” said explained Martin Elstner.

In this way signals are not translated and processed in a current flow, like in a computer but in a flow of matter. That their chemical processing platform works, Schiller and his staff demonstrated in the current study with the sample calculation 10 + 15.

“It took our sugar computer about 40 minutes, but the result was correct. It is not our aim to develop a chemical competition to established computer chips,” said Prof. Schiller.

The chemist rather sees the field of application in medical diagnostics. So it is for instance conceivable to connect the chemical analysis of several parameters of blood and urine samples via the molecular logic platform for a final diagnosis and thus enable decisions for therapies.

 

© Friedrich Schiller University Jena News

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