Bacteria, despite its quite simple device, they bring a lot of problems to a person. For example, the pseudomonas aeruginosa, which is the most disliked by the doctors, is the source of extremely dangerous nosocomial infections because of its high resistance to antibiotics, has recently brought a new surprise. A group of scientists from the University of California in Los Angeles found out that these bacteria are more dangerous than we thought.
As is known, Pseudomonas aeruginosa are able to form biofilms that protect them from external influences. In addition, these microorganisms are distinguished by a high degree of activity. Thanks to special chemical reactions and the ability to transmit signals, the colonies can coordinate the behavior with each other and transmit information about the harmful effects to other bacteria so that they "have time to prepare."
A group of researchers led by Dr. Gerard Wong, studying the biofilm formation process, discovered the ability of individual representatives of the colonies to "remember" this process. The fact is that at the initial stage of film formation (which lasts about 20 hours), the bacterial cells are not well retained on the surface of the film and are attached to it. About 95% of the cells are held no longer than 30 seconds, which slows the transmission of the signal between the cells of the colony. However, this concerns only the new colony. When scientists selected bacteria that already live on the formed film and were transplanted to a new sterile surface, they were fixed and formed a film several times faster, as if they "remembered" their previous experience.
"We noted coordinated fluctuations between the number of signaling molecules in cells and the activity of mobile protein structures on their surface. They were manifested in subsequent generations as a new form of "memory." This plays a key role in reducing their mobility and in irreversible fixing on the substrate, in the formation of biofilms, and in the transmission of information. "
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