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Pascale Michelon

Plant hormone and growth regulators - 2 views

extension.oregonstate.edu/...hormones.html

plant hormones

shared by Pascale Michelon on 11 Apr 10 - Cached
  • (Table 5)
  • Hormones are produced naturally by plants, while plant growth regulators are applied to plants by humans
    • Pascale Michelon
      Pascale Michelon on 11 Apr 10
       
      This is interesting because it shows you that if you want to manipulate hormones in an experiment you can use plant growth regulators to mimic the action of hormones.
  • ...3 more annotations...
  • There are five groups of plant-growth-regulating compounds: auxin, gibberellin (GA), cytokinin, ethylene, and abscisic acid (ABA).
  • Ethylene is unique in that it is found only in the gaseous form. It
  • induces ripening, causes leaves to droop (epinasty) and drop (abscission), and promotes senescence.
    • Pascale Michelon
      Pascale Michelon on 11 Apr 10
       
      The effects of ethylene (promotion of both aging/death and ripening) may explain why just one bad apple in a basket may spoil the whole bunch.
  • Pascale Michelon on 11 Apr 10
     
    Plant hormones and growth regulators are chemicals that affect flowering; aging; root growth; killing of leaves; prevention or promotion of stem elongation; color enhancement of fruit; prevention of leafing and/or leaf fall; etc.
Austin Kong

Science Resource Center -- Magazine Display - 0 views

galenet.galegroup.com/...SciRC

shared by Austin Kong on 17 Sep 09 - Cached
  • The biggest change: he divided the classes by gender. Because males have less serotonin in their brains, which Gray was taught may cause them to fidget more, desks were removed from the boys' classrooms and they got short exercise periods throughout the day. Because females have more oxytocin, a hormone linked to bonding, girls were given a carpeted area where they sit and discuss their feelings. Because boys have higher levels of testosterone and are theoretically more competitive, they were given timed, multiple-choice tests. The girls were given multiple-choice tests, too, but got more time to complete them. Gray says the gender-based curriculum gave the school "the edge we needed." Tests scores are up. Discipline problems are down. This year the fifth and sixth grades at Foust are adopting the new curriculum, too.
  • The biggest change: he divided the classes by gender. Because males have less serotonin in their brains, which Gray was taught may cause them to fidget more, desks were removed from the boys' classrooms and they got short exercise periods throughout the day. Because females have more oxytocin, a hormone linked to bonding, girls were given a carpeted area where they sit and discuss their feelings. Because boys have higher levels of testosterone and are theoretically more competitive, they were given timed, multiple-choice tests. The girls were given multiple-choice tests, too, but got more time to complete them.
  • Studies show that girls, for instance, have more active frontal lobes, stronger connections between brain hemispheres and "language centers" that mature earlier than their male counterparts. Critics of gender-based schooling charge that curricula designed to exploit such differences reinforce the most narrow cultural stereotypes. But proponents say that unless neurological, hormonal and cognitive differences between boys and girls are incorporated in the classroom, boys are at a disadvantage.
  • ...2 more annotations...
  • Seventy percent of children diagnosed with learning disabilities are male, and the sheer number of boys who struggle in school is staggering. Eighty percent of high-school drop-outs are boys and less than 45 percent of students enrolled in college are young men. To close the educational gender gap, Gurian says, teachers need to change their techniques. They should light classrooms more brightly for boys and speak to them loudly, since research shows males don't see or hear as well as females. Because boys are more-visual learners, teachers should illustrate a story before writing it and use an overhead projector to practice reading and writing. Gurian's ideas seem to be catching on. More than 185 public schools now offer some form of single-sex education, and Gurian has trained more than 15,000 teachers through his institute in Colorado Springs.
  • no one is exactly sure what those differences mean. Differences between boys and girls, says Sadker, are dwarfed by brain differences within each gender. "If you want to make schools a better place," says Sadker, "you have to strive to see kids as individuals."
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