Big boss. Meaning, origin, examples of the use of phraseological units

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Winged words, phraseological units. Meaning, history of origin, examples of use

Winged words, phraseological units

Directory / Winged words, phraseological units

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Big boss

Proverbs and sayings

Phraseologism: Big boss.

Meaning: An important, significant, influential person (iron.).

Origin: It is believed that the expression goes back to the speech of barge haulers. The cone was called the most experienced and strong barge hauler, walking in the strap first.

Random phraseology:

The enemy does not sleep.

Meaning:

Stay vigilant!

Origin:

The expression is a paraphrase of one of the gospel sayings: "Be sober, be awake, because your adversary walks around like a roaring lion, looking for someone to devour" (Gospel, First Epistle of the Apostle Peter, 5:8).

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Nanoparticles in silk 25.10.2009

Chemists from the USA have learned how to encrust silk with silver nanoparticles. Precious metal ions have the ability to precipitate from solution on biological fibers and recover to pure metal, forming nanoparticles associated with these fibers. In this case, it is possible to solve two problems: to prevent nanoparticles from sticking together and to evenly distribute them over the volume or surface of the material.

It was this ability of theirs that scientists from the Georgia Institute of Technology, led by Professor Vladimir Tsukryuk, took advantage of. They dissolved silkworm cocoons and the resulting solution was applied as a thin film on a silicon substrate. Then, a template pattern was drawn on it by nanolithography and placed in a solution containing silver ions.

After a few days or even weeks, nanoparticles were deposited on the silk, and a flexible elastic film of the composite was obtained with a thickness of only 100 nm. Its obvious use is a bactericidal dressing, containing, although an insignificant amount of silver, but this does not lose its effectiveness.

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