20 topic

The fernPolypodium vulgareis a phytoecdysteroid (PE)-producing plant. Cultures ofP. vulgareprothalus produce PE, whereas prothalus-derived callus cultures do not. However, this callus line can transform topically applied ecdysone (E) to 20-hydroxyecdysone (20E), which is the last step in the biosynthetic pathway of the main plant PE. This hydroxylation is cata-lysed by a cytochrome P450 enzyme.

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EURASIP Journal on Applied Signal Processing 2003:7, 649–658 c 2003 Hindawi Publishing Corporation Analog VLSI Models of Range-Tuned Neurons in the Bat Echolocation System Matthew Cheely Neurosciences and Cognitive Sciences Program, University of Maryland, College Park, MD 20742, USA Email: mcheely@isr.umd.edu Timothy Horiuchi Department of Electrical and Computer Engineering, University of Maryland, College Park, MD 20742, USA Institute for Systems Research, University of Maryland, College Park, MD 20742, USA Email: timmer@isr.umd.

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