Bacteria – tiny living things
Bacteria are small unicellular living things, that can be found everywhere. Most bacteria can be seen only with a microscope. Only viruses are smaller. There are many species of bacteria, some of them can live in extreme environments.
Bacteria take in food and send out waste through their cell walls. Most bacteria reproduce by dividing down the middle to form two separate cells. Billions of bacteria may form from a single bacterium in only 24 hours.
For breathing most bacteria need air and are called aerobic. But there are bacteria that live without air, anaerobic, and the oxygen in the air is poison for them. They feed on organic substances.
The Dutch merchant and amateur scientist Anton van Leeuwenhoek was the first to observe bacteria and other microorganisms. He described bacteria and other microorganisms in a series of letters to the Royal Society of London between 1674 and 1723.
Many bacteria cause illness, some help digest sewage in treatment plants, or produce the alcohol in wine, beer and liquors.
– For several thousand years, people have been using lactic acid bacteria in their own interests. With their help, cheese, kefir, all kinds of yoghurts and even vinegar are made.
– Physicians of the 21st century proved that the reserve of beneficial bacteria is in appendicitis. It turns out that appendicitis, which was treated so negligently in the last century, helps the body to develop immunity.
– Some bacteria can kill the pathogenic flora in the mouth and fight caries. However, they live only in the mouth of crocodiles.
– The human body contains about 2 kilograms of bacteria. Most of them live in the intestines.
– It turns out that bacteria can completely heal a person, and also destroy. At present, biological weapons and bacterial toxins already exist.