Plant semi-tolerant

There has been renewed interest in the study of plants which have adapted to arid or semi-arid habitats. This interest extends from the individuation of tolerant species for land reclamation to the cultivation of species for the production of renewable materials. Many Eremophila species produce abundant quantities of resin or material (up to 20% of dry weight) extractable with organic solvents. From the chemical point of view the genus produces a diversity of metabolites of which the most studied are the terpenoids. It seems timely to review the various terpenoid compounds produced by this genus and to highlight their uniqueness and the novel chemistry they have disclosed. 

One does not design a cell room to achieve a certain steady-state or 1-hr peak level of chlorine concentration in the air, nor does one attempt to establish a priori a tolerable exposure profile for plant personnel. Tables such as 8.6, in spite of the apparent precision of the numbers, are really qualitative or at best semi-quantitative indicators of the seriousness of a hazard. Designers of chlorine-handling plants must exercise proper care by designing to recognized industry standards, and operators must understand and observe established procedures. There is more on this subject in Section 16.2.1. 

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