If you take 40 pounds of luggage with you on a vacation and you buy 10 pounds of souvenirs for your family (because you're really nice), do those extra souvenirs change the density of your luggage? if the density does change, how does this happen?

this protocol provides a detailed procedure for co-immunoprecipitation (co-ip) to identify protein–protein interactions.

relative humidity, temperature and dew point -- are bound together in the mathematical relationship below. relative humidity changes when temperatures change. because warm air can hold more water vapor than cool air, relative humidity falls when the temperature rises if no moisture is added to the air. so i would say a