Density-adjusted liquids and methods using same

Disclosed are liquids and methods for manipulating the localization and/or buoyancy of a population of particles, or one or more subpopulation thereof, within a volume of a liquid. The specific density of the liquids may be adjusted using specific gravity-modifying means depending on the application and/or on the average density of a population of particles, or one or more subpopulations thereof, within the liquid. For example, density-adjusted liquids may be used to bias a population of particles, or one or more subpopulations of particles, upward or downward within a volume of the liquid. As another example, density-adjusted liquids may be used to maintain the distribution of a population of neutrally buoyant particles, or one or more subpopulation thereof, within a volume of such liquid.