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Nanoproducts can be dangerous

16.03.2011

The French Sanitary Safety Agency studied novelties on the market with the use of nanotechnology: antibacterial socks with silver nanoparticles, sunscreen with titanium dioxide nanoparticles, an additive to granulated sugar with silicon dioxide nanoparticles (so that sugar does not cake).

The conclusion of experts: the danger of these products has not been proven, but it is impossible to guarantee their safety. Moreover, it is not enough to check several nanosubstances for safety, each product must be checked, since the same nanoparticles can behave differently in different products.

The agency believes that such products should carry a label warning of the presence of nanoparticles and the possible danger.

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Microchips from bacteria 05.09.2015

Experts studying the behavior of bacteria at Rice University were able to create some kind of microcircuit. According to scientists, the bacteria in the digestive system form a community that functions according to certain rules. In order to introduce new bacteria into the intestines (this may be necessary for medical purposes), the "new settlers" should be made part of this community. Different bacteria in a community influence each other's activities, and the result is different from the result of the separate work of bacteria.

The model created by the researchers includes two types of genetically modified bacteria (E. coli modifications). Bacteria are connected by intercellular bonds and influence each other, regulating protein production.

The task of one group of bacteria, "activators", was to increase the expression of a particular gene. Another group, "suppressors", reduced the expression of other genes. Acting together, they caused fluctuations in the expression of genes in the entire population. This allowed the colony to produce more protein than the bacteria produce without such regulation.

At the next stage, the researchers expect to learn how to manage the operation of multicellular systems. The coordinated actions of such systems, causing a broad response in a population of bacteria, are close to what happens in such complex organisms as the human body when cells of different tissues interact with each other.

In the future, scientists talk about a kind of biological computer in the form of yogurt made from artificially created bacteria. To activate or deactivate this or that mechanism in it after "settlement" in the intestine, it will be enough for a person to adhere to a certain diet.

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