id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
cord-021013-xvc791wx	Wink, Michael	Chapter 1 Allelochemical Properties or the Raison D'être of Alkaloids	2008-05-30		.txt	text/plain	16153	810	47	In animals, we can observe the analogous situation in that many insects and other invertebrates (especially those which are sessile and unprotected by armor), but also some vertebrates, store secondary metabolites for their defense which are often similar in structure to plant allelochemicals (1,4,12,16,17,28-30, [494] [495] [496] 503) . During the next three decades this concept was improved experimentally, and we can summarize the present situation as follows Although the biological function of many plant-derived secondary metabolites has not been studied experimentally, it is now generally assumed that these compounds are important for the survival and fitness of a plant and that they are not useless waste products, as was suggested earlier in the twentieth century (34, 35) . These "generalists," as we can also call this subgroup of herbivores, are usually deterred from feeding on plants which store especially noxious metabolites and select those with less active ones (such as our crop species, where man has bred away many of the secondary metabolites that were originally present; see Table XI ).	./cache/cord-021013-xvc791wx.txt	./txt/cord-021013-xvc791wx.txt