A nursery school teacher was delivering a station wagon full of kids home one day when a fire truck zoomed past. Sitting in the front seat of the fire truck was a Dalmatian dog. The children began discussing the dog's duties.
"They use him to keep crowds back," said one youngster.
"No," said another. "He's just for good luck."
A third child brought the argument to a close with this comment: "They use the dogs," she said firmly, "to find the fire hydrants."
Martin RodbellBorn 1 Dec 1925; died 7 Dec 1998 at age 73.American biochemist who was awarded the 1994 Nobel Prize for Physiology or Medicine for his discovery in the 1960s of natural signal transducers called G-proteins that help cells in the body communicate with each other. He shared the prize with Alfred G. Gilman, who later proved Rodbell's hypothesis, by isolating the G-protein, which is so named because it binds to nucleotides called guanosine diphosphate and guanosine triphosphate, or GDP and GTP. Prior to Rodbell's research, scientists believed that only two substances—a hormone receptor and an interior cell enzyme—were responsible for cellular communication. Rodbell, however, discovered that the G-protein acted as an intermediate signal transducer between the two. |
