Taxonomic distinctions

The flavonoidal alkaloids have thus been found widely scattered throughout the higher plants. In view of the ubiquitous occurrence of flavonoids and the simplicity of the nitrogenous component in the compounds so far isolated, it is quite possible that they may occur in more species. The occurrence of the flavonoid alkaloids in Buchenavia but not Terminalia has been used to confirm the taxonomic distinction between these genera (6). 

Apart from this index, Simpson s A index [33] represents diversity based on the number of types and individuals. In addition, Warwick and Clarke s A+ and A- index [34] represents diversity by considering the taxonomic composition of the types present (i.e., taxonomic distinctness index). Refer to [31, 35] for the characteristics of these indices and the differences among them. 

A wide range of taxonomically distinct organisms is able to degrade or transform xenobiotics, and reactions carried out under anaerobic conditions merit continued attention. Sequential transformations reactions carried out by different organisms may be necessary to accomplish degradation of the initial substrate, and attempts to mimic such situations in laboratory experiments have been illuminating. 

Although these complexes are distributed over a wide range of taxonomically distinct algae, all the available evidence suggests they are quite closely related (with the possible exception of Isochrysis) in structure and amino acid sequence. Typical... 

From a taxonomically distinct and still unidentified specie of the Pseudopterogorgia genus, a related series of pseudopterosins containing bicyclic diterpenoid glycosides, 7 seco A-D, were also isolated and their structures elucidated by Look and Fenical [18]. Compounds 7 seco A-D possess potent anti-inflammatory and analgesic activities that are similar to the pseudopterosins, and also show antimicrobial activity towards the bacteria. Staphylococcus aureus. For example 7 seco-A, pseudopterosin exhibited a 69% reduction of inflammation in the mouse ear edema assay at a minimum inhibitory concentration (MIC) of 50 pg/ear. 

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