surfactant
dr. dolittle | July 6, 2017 Photo by Mike Blyth via Flickr Commons
Surfactant is a lipoprotein substance that is secreted by special cells located in the alveoli of our lungs. The alveoli are the grape-like structures where gas exchange happens. Without surfactant, these alveoli would collapse and prevent gas exchange.
Drawing of alveoli by Patrick J. Lynch, medical illustrator (Patrick J. Lynch, medical illustrator) CC BY 2.5 via Wikimedia Commons
Babies born prematurely often suffer from respiratory distress syndrome because their lungs do not make enough surfactant. Now researchers at the Karolinska Institute…
edyong | February 23, 2009In late 2007, seabirds off the coast of California began to die in record numbers. The waterproof nature of their feathers and been wrecked, and they were soaked to the skin. Without an insulating layer of air trapped within their plumage, the damp birds were suffering from extreme cold. These are exactly the type of problems that seabirds face when they blunder into oil spills, but in this case, not a drop of petroleum had entered the water. The problem was a biological one.
At the same time, Monterey Bay in California was plagued by a massive "red tide" - a bloom of microscopic algae…