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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Three-way signal and subwoofer signal conditioner. Encyclopedia of radio electronics and electrical engineering

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A three-band version of the combined filter based on the considered circuit solutions was proposed by Maxim Shcherbak from Petrozavodsk. This circuit uses second-order band-pass filters with a fixed cutoff frequency.

Three-way signal and subwoofer signal conditioner. Scheme
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Author: A. Shikhatov; Publication: bluesmobile.com/shikhman

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Harm of antibiotics and antiseptics 24.10.2023

The use of antibiotics, widely used in medicine, veterinary medicine and agriculture, faces the risk of developing microbial resistance. New scientific research is revealing the potential negative effects of antiseptics and disinfectants, highlighting their impact on bacterial resistance even at minimal concentrations.

Antibiotics designed to combat various infections can create conditions for the formation of resistant forms of microorganisms. This risk is also compounded by the use of antiseptics and disinfectants. Despite their widespread use in applications ranging from dentistry to indoor cleaning, these substances may contribute to the development of antibiotic resistance in bacteria.

The researchers analyzed ten popular disinfectants, including ethanol, chlorhexidine, silver nitrate, triclosan, sodium hypochlorite and others. Despite the variety of their applications and mechanisms of action, these substances demonstrate similar properties in changing the structure of the outer membranes of bacteria. The study found that such changes contribute to the formation of resistant forms of microorganisms.

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