Parathyroid hormone (PTH) function as immunologic mediator has become interesting with the recent usage of PTH analogue (teriparatide) in the management of osteoporosis. Since the early 1980s, PTH receptors were found on most immunologic cells (neutrophils, B and T cells).
But, the refrigerator will only keep food safely cold for about four hours if unopened during a power outage, according to the USDA. A full freezer will hold the temperature for about 48 hours if full (24 hours of half full), the USDA says. Generally, if the temperature in the thermometer in the freezer reads 40 degrees Fahrenheit or below, the food is safe and can be refrozen, according to the USDA.
When in doubt, throw it out! â  If your power was out just a few hours and you didnât open the refrigerator or freezer, chances are the food is OK. A refrigerator should keep food cold for four hours and a half-full freezer 24 hours (48 hours if the freezer is full) if you donât open the doors. â  Try not to open the refrigerator and freezer doors (doing so lets the cold air escape). â  Surround food with ice to keep it cold or place in a cooler to keep it cold.