Taxonomic classification sections

Abstract This chapter reviews chemical structures of biologically active, volatile compounds in beetles. Techniques used for structure elucidation are briefly discussed as well as facts and speculations on the biosynthesis of target compounds. Syntheses of selected substances are cursorily presented. The order of sections follows taxonomic classifications. Depending on the biological significance of relevant compounds in certain taxa, the corresponding sections are again subdivided into attractive compounds (mostly intraspecifically active pheromones) and defensive compounds (mostly interspecifically active allomones). 

The presence of pavines and isopavines has been used to provide assistance for taxonomic classifications, and to determine intergeneric and phylogenic relationships in the genera Papaver and Argemone. The results of extensive chemical research on Papaver species demonstrated that morphologically distinct sections are also chemically distinguishable by virtue of their alkaloidal profile (170). Out of nine well-defined sections of Papaver, the Section Scapiflora, which displays... 

With few exceptions, all the promoter regions contain the consensus sequence TTTA /tA. There are some indications that minor variations in this sequence motif occur in different orders of the hyperthermophiles but it is difficult to assess how significant this is given the relatively small number of sequences available. This is complicated further by recent analyses of the phylogeny of the hyperthermophiles based on partial 23 S rRNA sequences [40] which suggest that the taxonomic classification in Table 1 needs revision (see section 7). For many promoters the A-T-rich motif is longer than 5-6 base pairs indeed, for the Mt. fervidus genes it extends to 14-15 consecutive A-T pairs (Table 4). 

In this section the secondary metabolites from lithistid sponges are described following the taxonomic classification of extant lithistid sponges reported by Faulkner [2],... 

Wild Narcissus species and hybrids are grouped into Subgenera and Sections according to the Narcissus classification of Mathew ( ). Some taxonomical aspects are also based on the works of Barra and Lopez-Gonzalez (145,146), Dorda and Fernandez-Casas (147-152), Fernandes (10,153), and Fernandez-Casas (154-157). 

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