In DSM, nicotine dependence is included under the general definition of substance dependence.  The essential feature of Substance Dependence is a cluster of cognitive, behavioral, and physiologic symptoms indicating that the individual continues use of the substance despite significant substance-related problems.
Greenhouse Covering. Whether you're replacing existing greenhouse coverings or building a greenhouse you're sure to find the best greenhouse covering at FarmTek. Greenhouse glazing is the material that covers the greenhouse frame and the most widely used materials are polycarbonate and poly film.
Our Commercial Greenhouses are perfect for schools, agriculture programs, commercial and retail growing operations. Commercial Greenhouses are larger greenhouses often made with galvanized steel frames that can accommodate large growing operations or horticultural programs. Our commercial greenhouse kits are ready for your local contractor to build or, our greenhouse construction team can build your organization a turnkey greenhouse.