Biology of Springtails by Stephen P. Hopkin

By Stephen P. Hopkin

This complete paintings is the 1st single-volume ebook of the twentieth century to check the biology of this significant crew of bugs, together with an entire checklist of Collembola genera including greater than 2,500 references in addition to the discussions of springtail habit, body structure and evolution.

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4 CoMFA electrostatic and steric field contour plots for DAH toxicity toward C. suppressalis, S. exigua, and L. decemlineata. The diacylhydrazine with X = 2-Cl and Y = 2,3-di-Cl is depicted. Green/yellow polyhedra represent sterically-favored/disfavored regions; blue/red polyhedra represent regions where positive charge is favored/disfavored (Reproduced with the permission of Wiley-VCH Verlag GmbH & Co. KGaA) (see also page 489) Fig. 5 CoMFA hydrogen-bond field contour plots for toxicity toward C.

Side-chain epoxide groups) appear to be unique to fungi. It is currently not clear if fungi possess the ability to generate ecdysteroids from sterols, or whether they take in phytoecdysteroids from their substratum and modify them. a OH OH OH OH OH OH 29C 28C 27C HO HO HO OH OH OH HO HO HO OH OH OH H O H O Makisterone C Makisterone A H O 20-Hydroxyecdysone O 24C O HO O 21C HO OH HO H O Sidisterone O HO OH HO 19C OH HO H O Poststerone H O Rubrosterone Fig. 1 Summary of the diversity of phytoecdysteroid structures, show examples of variety in steroids (panel a) 10 L.

Phytoecdysteroid-containing extracts were positive in the agonist bioassay and in the immunoassays. g. org), which permits one, with significant certainty, to identify the species which contain (i) phytoecdysteroids (agonist bioassay positive, RIA-positive; 5–6% of species based on seed extracts), (ii) ecdysteroid antagonists (antagonist bioassay positive, RIA-negative; 2% of species), or (iii) non-steroidal agonists (agonist bioassay positive, RIA-negative; very rare), and to use the data to consider the taxonomic significance of the distribution of ecdysteroid agonists/antagonists.

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