Density-dependent factors include disease, competition, and predation. Density-dependant factors can have either a positive or a negative correlation to population size. With a positive relationship, these limiting factors increase with the size of the population and limit growth as population size increases.
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The Bair Hugger Normothermia System is a forced-air warming (FAW) system designed to prevent hypothermia and keep patients at a normal core body temperature during orthopedic surgery. Hospitals have used Bair Hugger devices on more than 200 million patients since 1987 and continue to do so today. More than 50,000 units are installed in the 80 percent of hospitals in the U.S. that use FAW therapy today. The current Bair Hugger warming units include models 505, 750 and 775.