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24 April 2014 11:45 am ,
Vol. 344 ,
Major climate data sets have underestimated the rate of global warming in the last 15 years owing largely to poor data...
The tsetse fly is best known as the vector for the trypanosome parasites that cause sleeping sickness and a disease in...
The National Institutes of Health is revising its "two strikes" rule, which allowed researchers only one chance to...
By stabilizing the components of retromers, molecular complexes that act like recycling bins in cells, a recently...
Fossil fuels power modern society by generating heat, but much of that heat is wasted. Semiconductor devices called...
Researchers are gaining insights into what made Supertyphoon Haiyan so powerful and devastating through post-storm...
Millions around the world got a first-hand look at what it was like to be in Tacloban while it was pummeled by...
- 24 April 2014 11:45 am , Vol. 344 , #6182
- About Us
For Whom the Bell Tolls
24 September 1999 6:30 pm
Today is the birthday of Ivar Pavlov, a Russian physiologist born in 1849 who is best known for his studies of the conditioning of dogs. Between 1890 and 1900, Pavlov investigated the secretory mechanisms of digestion in animals. In his most famous experiment, he fitted dogs with a tube on the cheek to measure their saliva production. Each time Pavlov showed the dogs food, he rang a bell, a neutral stimulus with no natural meaning for the dogs. He discovered that if this association was repeated enough times, the bell ringing alone would trigger salivation. Pavlov was awarded the Nobel Prize in physiology or medicine in 1904 for his 1897 work, "Lectures on the Work of the Principal Digestive Gland," which summarized his research findings.
[Source: Roy Porter, Ed., The Biographical Dictionary of Scientists (Oxford University Press, ed. 2, 1994).]