In biology, the active site is the region of an enzyme where substrate molecules bind and undergo a chemical reaction. The active site consists of residues that form temporary bonds with the substrate (binding site) and residues that catalyse a reaction of that substrate (catalytic site).
Seattle is rolling out 11 rainbow crosswalks in Capitol Hill this week, adding a colorful bang to the annual Pride celebration. The crosswalks cost the city $66,000, said Seattle Department of Transportation spokesman Rick Sheridan, and are permanent.
Brick Walkway Costs and Considerations. A professional will charge something on the order of $8 to $15 per square foot (or more) to install a brick walkway. For a basic 25-foot long by 4-foot wide walkway, thatâs an estimated cost of $800-$1,500. The labor required to install a brick walkway is a major cost determinant.