Isotopes

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Slides from the isotopes discussion in AP Biology.

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  • http://www.youtube.com/watch?v=rFPlQK9rn14 http://www.pbs.org/wgbh/nova/butterflies/
  • monarcs, sea turtles, many other difficult to follow migratory animals
  • ice core lab/storage facility
  • Isotopes

    1. 1. Isotopes What good are they?
    2. 2. Isotopes •forms of an atom with varying numbers of neutrons •can be identified by their weight
    3. 3. Some are radioactive and some are stable.
    4. 4. •neutrons “fall off” •emission can be detected and traced •molecules “decay” into another kind of molecule Some are radioactive and some are stable.
    5. 5. •neutrons “fall off” •emission can be detected and traced •molecules “decay” into another kind of molecule •neutrons stay put •remain as they are over time Some are radioactive and some are stable.
    6. 6. Monarch Migration video (NOVA) http://www.pbs.org/wgbh/nova/nature/journey-butterflies.html
    7. 7. Until now, there's never been a good way to find out exactly where the Mexican monarchs spend their summers and reproduce. Butterfly tagging programs are popular. But only a few tagged butterflies are found among the millions of monarchs in the wintering grounds. Butterflies are too small to track with radios or satellites.
    8. 8. In nature, an element occurs as a mixture of isotopes which can vary according to geography and other environmental factors
    9. 9. How can isotopes be used to study monarch migration?
    10. 10. How can isotopes be used to study monarch migration? Researchers analyze wing membranes because their isotopic composition does not change after they are formed at the breeding site.
    11. 11. radioactive isotopes can be used to: •trace atoms in metabolism •diagnose medical disorders •monitor chemical processes in the body
    12. 12. date fossils
    13. 13. Anthropological and forensic problems?
    14. 14. As well as in determining past climates from oxygen isotopes in ice and ocean organisms
    15. 15. Which oxygen isotope gets trapped in ice (as a result of precipitation) and in the shells of ocean organisms is temperature dependent so . . .
    16. 16. Which oxygen isotope gets trapped in ice (as a result of precipitation) and in the shells of ocean organisms is temperature dependent so . . . ratios can be used to determine past temperatures ratios can be used to determine past temperatures
    17. 17. ice core sampling
    18. 18. ice core storage facility
    19. 19. Uses for isotopes: •tracking migration •medical uses •forensic uses •environmental changes (like climate changes and pollution movement) •radioactive isotopes can be used for aging things
    20. 20. the end

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