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.
What you pay for three-piece crown molding depends on factors including the type of molding you select, the amount of space to be covered, the jobâs difficulty and the professional you hire. Most professionals charge about $4 to $8 per linear foot for material and labor. The average cost to have a professional install crown molding on 500 linear feet usually ranges from about $2,000 to $4,000. If you want to tackle your own crown molding installation, read more here.