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.
Relay Rail with 136/141 # CWR - This work consists of removing existing rail, spikes, plates, and. anchors and installing new 136 or 141 lb CWR and appropriate plates, fasteners and longitudinal. restraints on existing crossties. The unit cost for this item is $400,000 per mile.