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.
A greenhouse that is used to grow native plants and is an actual building (as opposed to just plastic over a frame), that is insulated, vented, and well designed can be close to a zero energy user or even an energy producer with the use of alternative energy production on site and the reuse of waste materials.