Bacteria proved to be performing 'large-scale suicide attack' to overcome the survival competition
Bacteria are aggressive creatures that try to kill their competitors and prosper their stock in a variety of ways. It turned out that such bacteria 'perform a large-scale suicide attack.'
The Evolution of Mass Cell Suicide in Bacterial Warfare-S0960-9822(20)30646-1.pdf
(PDF file)
Bacteria perform mass suicide to defend their colony | University of Oxford
http://www.ox.ac.uk/news/2020-06-05-bacteria-perform-mass-suicide-defend-their-colony
One of the ways bacteria kill their rivals is by 'suicide bombing.' In this suicide attack, bacteria actively destroy themselves and release large amounts of toxins that kill other strains. It has been known that some bacteria carry out this kind of suicide attack, but we do not know the scale, and we think that ``only a few bacteria will carry out suicide attacks''. Has been done.
However, a suicide bomb attack by bacteria has been carried out on a fairly large scale, and millions of bacteria can simultaneously carry out a suicide bomb attack, a new paper by the Oxford University research team.
The research team developed a technology called 'coloring bacteria that attack suicide bombs', using a time-lapse microscope capable of time- lapse imaging of faint fluorescence, during the 'war of bacteria' in the battle between separate colonies I took a picture.
If you look at the released movie (37.9 MB), you can see that suicide attacks are taking place on a fairly large scale in the war of bacteria.
In the movie, two colonies are in war.
The part facing the enemy's colony can be said to be the front line of the war, and many bacteria repeat suicide attacks, releasing a large amount of toxins.
This front line looks like this when magnified with a time-lapse microscope. Green indicates normal bacteria, purple indicates suicide attacked bacteria.
Over time, the number of bacteria that attack themselves will continue to increase...
Eight hours after the war started, the front line was full of germs that attacked themselves. This suicide attack is often done by 'dying bacteria.'
According to the research team, it is known that ``self-destruction attack'' is not only for bacteria but also for insects with sociality such as ants and bees to execute large-scale suicide attacks against external enemies. ..
Escherichia coli, the most frequently used bacterium in scientific research, also makes this suicide attack, says co-author Professor Kevin Foster, 'Bacteria like E. coli are pathogens that live in our bodies. At the same time, it is also a symbiotic organism, so whether or not bacteria such as Escherichia coli win the “war of bacteria” is an issue that affects human health. It can lead to weakening and promotion of bacteria that are beneficial to the human body.'
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