The movement of ions or molecules across a cell membrane in the direction opposite that of diffusion, that is, from an area of lower concentration to one of higher concentration. The energy needed for active transport is supplied by ATP.
At the second tier, you can expect to pay $60 - $70 per linear foot. You'll have some concerns about chipping and denting, but less so than at the lower tier. At the highest tier, soapstone bathroom countertops are priced at $70 - $80 per linear foot, and their durability should not be an issue. See also: Bathroom Remodeling Ideas, Options and Solutions.
Average minimum cost of Silestone countertops: $55 per square foot. Average maximum cost of Silestone countertops: $85 per square foot. Costs also vary based on the type of pattern being used. Different colors and patterns range from a low end of $55 to a high of $95 per square foot. The square footage of the countertop should be measured first when taking costs into consideration since a large countertop can be much more expensive to install.