Final answer:
A UV Sterilizer uses UV light to kill bacteria in a dry setting, perfect for disinfecting surfaces and purifying air. It works by interrupting the genetic material of microorganisms. Antiseptics, not UV radiation, are best for preventing infections on tissues.
Step-by-step explanation:
Among the options provided, the machine that uses UV light to kill bacteria in a dry setting is the UV Sterilizer (A). UV sterilizers are designed to disinfect surfaces and air by using ultraviolet light to damage the DNA and RNA of microorganisms, effectively preventing them from reproducing and causing infection. This process is efficient against a variety of pathogens, including bacteria, viruses, and fungi.
On the subject of microbial control, the appropriate substance for use on tissues to prevent infection is an antiseptic (B). Antiseptics are mild enough to be used on living tissues to prevent microbial infections. Disinfectants, by contrast, are typically too harsh for living tissue and are used on inanimate objects to kill microbes.
UV disinfection is a powerful nonionizing radiation method that disrupts the microbial DNA with thymine dimers, rendering the microorganisms inactive. This makes UV disinfection an effective tool for sanitizing various environments, although its lack of penetration means that organisms must be directly exposed to the UV light for it to be effective.