MSG, or monosodium glutamate, is a common and widespread additive in food used mainly for flavor enhancement, but also for preservation. MSG has been used for well over a century as a food additive, but in the last couple of decades anecdotal claims of illness have been linked to MSG consumption.SG is the salt form of glutamic acid, which is a naturally occurring amino acid. Seaweeds and many other plants and vegetables contain glutamic acid.
From Wikipedia, the free encyclopedia. Auto-defrost, automatic defrost or self-defrosting is a technique which regularly defrosts the evaporator in a refrigerator or freezer. Appliances using this technique are often called frost free, frostless or no-frost.
Defrosting by definition indicates a temperature fluctuation, whether in a lab freezer or lab refrigerator. Defrosting cycles can be manual (manual defrost) or automatic (auto-defrost). A manual defrost freezer functions by circulating refrigerant in the walls of the unit.he controller can be programmed with defrost cycle duration and frequency. While practices will vary from lab to lab, refrigerator defrosting should typically occur every 6-8 hours for frequently used units or once in 24 hours for units not in use.