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Antibiotics

Antibiotics (antibiotica; Greek anti-– against; opposite property, action, situation + Greek bios – life) – substances which are produced by fabrics of an animal organism, the higher plants or microorganisms, having ability selectively to suppress development of microorganisms or cells of some tumors.

 
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In operating time our brain spends the amount of energy equal to the 10 Watts bulb. So the image of a bulb over the head at the time of emergence of an interesting thought is not so far from the truth.