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.
Benjamin Moore's Aura Satin and new Regal Select Semi-Gloss were front-runners in part because CR's tests showed that they're better than earlier products at maintaining their gloss after cleaning. Both also leave a smoother finish and stand up better to scrubbing. But at $50 per gallon, even the less-pricey Regal Select costs almost $20 more than the Behr paints, which performed almost as well. Paints that require less work and have fewer toxins are a bonus this year, as are more top choices for less than $30 per gallon.