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Phone in hours

02.07.2003

The Japanese firm "Dokomo" has begun production of a cell phone worn on the wrist like a watch.

To make a call, you need to remove the device from your hand and attach one end of the bracelet to your ear, and speak in the other. The phone weighs 113 grams, its owner is able to use e-mail in addition to making conversations, as well as browsing Internet sites specially simplified for the phone.

The battery charge allows you to talk without interruption for two hours, and in the call standby mode, the energy lasts for 200 hours. Of course, the device also acts as a conventional electronic clock.

The new phone will be sold only in Japan, as it is designed for the Japanese cellular standard, which is not used in other countries. A similar novelty is being prepared by Samsung.

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The choice of hosts is quite logical: while the mosquito sucks the blood of an animal, the malarial plasmodium can go where it needs to go at the moment. To ensure that there are no delays with the relocation, Plasmodium even change the smell of animals, making it more tempting for mosquitoes. It is also known that people with malaria are more attractive to bloodsuckers. It is clear that Plasmodium also alters human odor, and a recent article in PNAS describes how they do this.

Researchers from the London School of Hygiene and Tropical Diseases, along with colleagues from other European and African research centers, compared the composition of sweat in several dozen Kenyan schoolchildren, among whom were both healthy and recently infected with malaria.
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Then the researchers began to find out exactly what substances attract insects to us. To do this, sweat samples were first analyzed for chemical composition, and then each of the substances found in it was given a try by mosquitoes. "Try" here means that the antennas of the mosquitoes were blown with air containing one or another odorous component, while simultaneously reading with the help of special electrodes the neural signals that the antennas of the mosquitoes sent to the brain.

As a result, it was possible to identify several compounds that especially strongly excited insects and which were especially numerous in the sweat of patients. Among them were heptane, octane and nonane aldehydes used in perfumery due to their smells (for example, heptane aldehyde gives a clove aroma, and nonane - orange or pink). Obviously, their mixture attracts mosquitoes especially strongly, and human plasmodia in the course of evolution attacked the right recipe.

Curiously, mosquitoes reacted differently to an increase in odor: if the amount of heptanealdehyde in the mixture increased sharply, the insects flew to the smell much more actively, but if the amount of aldehyde increased smoothly, the mosquitoes remained indifferent.

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