(materials). A solvent in whose molecules there is either a permanent separation of positive and negative charges, or the centers of positive and negative charges do not coincide; these solvents have high dielectric constants, are chemically active, and form coordinate covalent bonds; examples are alcohols and ketones.1  Facebook.materials). A solvent in whose molecules there is either a permanent separation of positive and negative charges, or the centers of positive and negative charges do not coincide; these solvents have high dielectric constants, are chemically active, and form coordinate covalent bonds; examples are alcohols and ketones.
The bottleneck effect. The bottleneck effect is an extreme example of genetic drift that happens when the size of a population is severely reduced. Events like natural disasters (earthquakes, floods, fires) can decimate a population, killing most indviduals and leaving behind a small, random assortment of survivors.
(December 2014). In production and project management, a bottleneck is one process in a chain of processes, such that its limited capacity reduces the capacity of the whole chain.An example is the lack of smelter and refinery supply which cause bottlenecks upstream.December 2014). In production and project management, a bottleneck is one process in a chain of processes, such that its limited capacity reduces the capacity of the whole chain.