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.
...coming up this Saturday... SOAP MAKING with Lynn Coronado! Saturday August 20th, Sierra Vista Food Co-op will be hosting another wonderful soap making class led by Lynn Coronado. Class time will be from 10am 'til noon and the cost is $20 per person. Each student will receive soap samples, handouts and a full demonstration of the cold processing method.