Beta-lactamase-producing bacteria (BLPB) may have an important clinical role in infections. These organisms can be pathogenic in causing the infection as well as have an indirect effect through their ability to produce the enzyme BL into their environment.
If you turn the dial to number 0, that effectively turns the fridge off. Setting the dial to 9, the refrigerator will be working at its max capability. Your personal temperature setting will depend on how much food is kept in the refrigerator. If your fridge is packed with food, it needs to be on a higher number setting to maintain a low (colder) temperature. The temperature controller dial or slider on your refrigerator is a thermostat. It kicks the compressor on when the refrigerator is not cold enough.
Opening the door for 30 seconds can lead to temperature change of 5-10 degrees. It can then take up to 15 minutes for the fridge to return to its initial low temperature. Dairy products and drinks should be placed at the top of the refrigerator, cool but not too cold, so they do not freeze. Preferably, place milk and dairy products on the side where the cold air blows and position drinks on the other side. Meats and fish should be on the mid-tier shelf. Cheeses and cold cuts should be placed in the top drawer below the bottom shelf. Fruit and produce (salads and vegetables) can be in the middle of bottom drawer, still cool but not too cold so they do not freeze. One of these drawers usually has a humidity control.