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.
For every 20 minutes over two hours your food sits at room temperature, the level of bacteria doubles in quantity, so donât procrastinate! Leftovers can safely keep for 3 to 4 days in the refrigerator, or 3 to 4 months in the freezer. â¢ Throw away hot or cold food that has been left out at room temperature for more than 2 hours, or 1 hour if the temperature happened to be extremely warm, such as above 90Â°F (for instance at an outdoor event).