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.
Get free estimates from local Countertops contractors. The average cost of Silestone countertops runs anywhere from a low of $50 to a high of up to $100 per square foot, depending on thickness and grade of quality. Average thickness varies but is usually around .75 to an inch thick. Adding inches to anything above this can add on a price of $4 or more per square foot.