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[November 27 AFP] It is supposing one drop of radiation of boiling water or microwave and a disinfectant is also unnecessary also as for the — deer which I want to imagine the kitchen counter etc. of the sickroom where bacteria do not exist, a doorknob, and a kitchen although bacteria are killed. .
Such the way of thinking served as a backdrop of having brought about the surprising discovery by the scientists of Australia.
the research team led by Mr. Elena Ivanova (Elena Ivanova) of ? Australia Swinburne college of engineering (Swinburne University of Technology) on the 26th The hint was obtained from the dragonfly of the insect and the paper of having resulted in discovery of the nanotechnology face structure which kills bacteria physically was announced to English Science journal Nature Communications (Nature Communications).
That has ? bactericidal effect is the “black silicon” discovered by chance in the 1990s, and it is the substance by which promising 視 is carried out as a semiconductor for solar array panels now.
If the surface of ? black silicon is seen by an electron microscope, the 500 nm (1 nm is equivalent to 1/1 billion meter)-high point has the structure where the keenly sharp projection stands close together.
When bacteria touched this structure, the research team discovered that a bacterial cell membrane was torn.
This is the first time that it became clear that each surface with water repellence has a physical property as such a bacteria agent.
? research team was infected also with man, and discovered and wondered doing a bactericidal action with powerful feather of semi in 2012 to one sort of pseudomonas aeruginosa (Pseudomonas aeruginosa) of the “opportunism bacillus” which comes to have the tolerance to an antibiotic.
Detailed investigation showed that an answer was in “the nano pillar (very detailed projection)” on a par with the surface of feather at equal intervals instead of the biochemical character of feather.
Bacteria will be torn apart in pieces, if it adheres to this surface.
? research team investigated the nano structure which covers the surface of the transparent front feather of the dragonfly of the red color of the body which inhabits Australia called a ベニヒメ dragonfly (scientific name: Diplacodes bipunctata), in order to further pursue this discovery.
There are slight 240-nm-high small projection structures in the feather of a ベニヒメ dragonfly rather than black silicon.
? — when the feather of this dragonfly and the performance of black silicon were inspected in the laboratory, both had very powerful sterilization capability.
These surfaces where a finger point is smooth destroyed the bacterial spore of the protective film which covers the surface of two kinds of bacteria called gram negative bacteria (Gram-negative) and gram positive bacteria (Gram-positive), and the dormancy bacteria of specific time.
The bacteria which were the experiment targets of ? this time are three sorts of the very strong bacterial spore of the bacillus subtlis (Bacillus subtilis) of the friend of anthrax in the pseudomonas aeruginosa, notorious staphylococcus aureus (Staphylococcus aureus), and the soil bacteria that lives broadly.
After making ? bacteria adhere, the kill ratios per 1 square centimeter of surface after 3-hour progress were about 450,000 bacteria cells per minute.
This is 810 times the least amount required to infect staphylococcus aureus with man, and corresponds 77,400 times in the pseudomonas aeruginosa.
If the manufacturing cost of ? black silicon becomes a neck, if a large number [ the choice for making the surface with nanoscale bacteria murder capability ] otherwise, the research team has pointed out and is describing “The antibacterial synthetic nano substance in which the same validity is shown can be easily manufactured in a broad field.”