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.
We need plants to conserve and recycle resources, helping maintain a breathable atmosphere and a drinkable water supply. Much easier said than done. In order to build a space greenhouse that doesnât eventually kill us, we first need to understand how plants make a living and how theyâve shaped our planet.