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Chemical Signals 1

Chemical Signals 1. BIOL 1407. Chemical Signals. Cells use chemicals to communicate with other cells http://www.livevideo.com/video/9DF33CE7B1014B55BEF2322395D72133/neutrophil-chemotaxis.aspx Photo Credit of Neutrophil engulfing anthrax bacteria: Tim Vickers, 2007, Wikimedia Commons.

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Chemical Signals 1

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  1. Chemical Signals 1 BIOL 1407

  2. Chemical Signals • Cells use chemicals to communicate with other cells • http://www.livevideo.com/video/9DF33CE7B1014B55BEF2322395D72133/neutrophil-chemotaxis.aspx • Photo Credit of Neutrophil engulfing anthrax bacteria: Tim Vickers, 2007, Wikimedia Commons

  3. Chemical Signaling: Direct Contact

  4. Chemical Signaling: Short-Distance

  5. Chemical Signaling: Long-Distance

  6. Chemical Signaling Between Individuals • Pheromones • Video of Orchid Wasp Mimic: http://www.youtube.com/watch?v=-h8I3cqpgnA • Photo credit for Spined Soldier Bug eating Mexican Bean Beetle larvae: USDA, 2006, Wikimedia Commons • Article on Spined Soldier Bug and his pheromones: http://www.nytimes.com/1992/03/01/news/cuttings-the-enemy-s-enemy-is-the-soldier-bug.html?partner=rssnyt&emc=rss&pagewanted=all

  7. Signal Transduction Pathways

  8. Receptors

  9. Target Cells: Have Receptors for Signal

  10. Target Cells and Specificity

  11. Types of Hormones

  12. Transport and Receptor Location

  13. Water-Soluble Hormones

  14. G Proteins

  15. Second Messengers • cAMP • cGMP • IP3 and DAG • Calcium • Calmodulin

  16. Lipid-Soluble Hormones

  17. Steroid Hormones • Brassinosteroids in plants • Steroid hormones in animals • Synthesized from Cholesterol • Testosterone, Progesterone, Estrogens • Cortisol and Aldosterone from adrenal cortex

  18. Seed Dormancy and Germination • ABA • High levels inhibit germination = promotes dormancy • Gibberellins • High levels promote seed germination

  19. Al-your-own skew-Tell-um

  20. Trigger for Desert Seed Germination: Rain Photo Credit for Storm Over Western Ghats: PlaneMad, 2006, Wikimedia Commons

  21. Desert Seed Germination • Attenborough Video: • http://www.youtube.com/watch?v=z1IBnHIOFxs • Photo Credit for South Africa Desert in Bloom: Winfried Bruenicen, 2001, Wikimedia Commons

  22. Volatile Chemicals • Jasmonic Acid and Plant Volatiles • Dodder plant seeks close relationship with tomato plant • http://imagearchive.psu.edu/displayimage.php?pos=-19895 • Photo Credit for Dodder in Bloom: Michael Becker, 2005, Wikimedia Commons

  23. Photo Credit for Dodder on Acacia: Khalid Mahmood, 2007, Wikimedia Commons

  24. Photo Credit for Parasitoid Wasp on Plant Bug Nymph: Scott Bauer, USDA, 2003, Wikimedia Commons

  25. The End Unless otherwise specified, all images in this presentation came from: Campbell, et al. 2008. Biology, 8th ed. Pearson Benjamin Cummings.

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