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Battery powered by human saliva

13.08.2017

Imagine you are stuck somewhere in the middle of nowhere and the battery on your phone is dead. No electricity, not even solar power. And then you resort to the last resort - your own saliva.

This is the idea of researchers at Binghamton University, who have developed a battery that can be charged from saliva.

This development is the next step in microbial power sources, where electricity is generated by bacteria. The basis of the new type of battery is ordinary paper. Scientists have created dormant frozen cells that can send electricity outside their walls. These exoelectrogenic cells can be moistened with ordinary saliva, and then they begin to generate current after a few minutes.

The next step is to improve the power output of these batteries by getting more watts per square centimeter.

"Currently, we have a power density of only a few microwatts per square centimeter. While 16 microbial fuel cells located on a single sheet of paper generate enough electrical voltage to power a light diode, other devices require a significant increase in power," says Professor Soy- hyung Choi, inventor of the device.

So, we should not wait for such a battery in the phone yet, but if it is already able to light the diode, it still has everything ahead of it.

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Massachusetts-style mosquito control 20.06.2008

US engineers have come up with a device that quickly destroys all mosquitoes in an area of 40 acres.

The problem of the summer struggle with the blood-sucking midge is faced not only by the inhabitants of the northern and temperate latitudes of Eurasia, but also on the other side of the globe, in North America. For example, American engineers from the Katz Inc. The state of Massachusetts decided to approach the seemingly unsolvable problem of the complete destruction of mosquitoes on a single piece of land. To do this, they created a vacuum cleaner trap.

"We disguised the vacuum cleaner as a home. To do this, it comes with a flavor containing lactic acid and octanol - the most attractive human odor components for mosquitoes. In addition, the device includes a burner and a propane tank. The gas burns and emits heat, as well as carbon dioxide The combination of heat, aromas, humidity and carbon dioxide is chosen so that the mosquito mistook the vacuum cleaner for a real home and fell into the trap, "says project leader Kristin Anderson.

Tests have shown that it is the increased carbon dioxide content around the new trap that is most attractive to mosquitoes. Every month, thousands of them found their end in a special drive.

Taking into account the fact that this insect rarely flies more than a kilometer from its birthplace, within a month after the start of round-the-clock operation of the device, the number of mosquitoes in an area of 40 acres around it sharply decreased.

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