- News Home
5 December 2013 11:26 am ,
Vol. 342 ,
An animal rights group known as the Nonhuman Rights Project filed lawsuits in three New York courts this week in an...
Researchers have been hot on the trail of the elusive Denisovans, a type of ancient human known only by their DNA and...
Thousands of scientists in the Russian Academy of Sciences (RAS) are about to lose their jobs as a result of the...
Dyslexia, a learning disability that hinders reading, hasn't been associated with deficits in vision, hearing, or...
Exotic, elusive, and dangerous, snakes have fascinated humankind for millennia. They can be hard to find, yet their...
Researchers have sequenced and analyzed the first two snake genomes, which represent two evolutionary extremes. The...
Snake venoms are remarkably complex mixtures that can stun or kill prey within minutes. But more and more researchers...
At age 30, Dutch biologist Freek Vonk has built up a respectable career as a snake scientist. But in his home country,...
- 5 December 2013 11:26 am , Vol. 342 , #6163
- About Us
17 September 1997 8:00 pm
Today is the 320th anniversary of the birth of Stephen Hales, an English clergyman known for his careful biological research, particularly on the physiology and growth of plants. Hales conducted a number of experiments between 1719 and 1725 in which he measured the pressure exerted by water moving through a plant. He attached a glass tube or a simple manometer filled with mercury to a cut stem surface and measured the change in height of the sap, which indicated root pressure. Hales made similar measurements of blood pressure in domestic animals, and by injecting chemicals, estimated blood-flow rates in organs. Hales also discovered the dangers of breathing "spent" air in enclosed spaces and invented a ventilator, which he introduced on ships and in hospitals and prisons.
[Source: Roy Porter, Ed., The Biographical Dictionary of Scientists (Oxford University Press, ed. 2, 1994).]