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.
Costs of Manufactured Stone. Manufactured stone is a low-cost alternative to natural stone, and prices start at just $3 per square foot. Those wanting something that looks a little more natural and resembles certain types of stone will find that the price doubles or triples per square foot. The cost of installing the stone can range from as little as $10 per hour up to $50 per hour or more. It depends on the price charged by the installer. Manufactured stone also comes in a thinner lightweight version called manufactured stone veneer.