Although oxygen is essential for air-breathing species and allowed for the evolution of multicellular organisms, it is also a dangerous molecule that can lead to cellular toxicity through the generation of reactive oxygen species (ROS). However, it is important to point out that cellular ROS also play several physiological roles in the body. I just read an interesting review article published in Physiological Reviews that explored natural oxygen delivery and availability […]
Yes, you read that right. Ornithologists in Australia have received enough witness accounts of birds starting new fires by picking up burning twigs to believe the birds may actually be starting fires deliberately. They think these so-called ‘firehawks’ start fires to flush out prey. Yikes!
A new study published in American Journal of Physiology – Regulatory, Integrative and Comparative Physiology explored the effects of modest heat stress (35°C, 95°F) on the physiology of pigs. The found that pigs exposed to heat stress ate less than those exposed to ambient temperatures. I understand. I eat less when it is hot outside too. Since skeletal muscle is such a large metabolically active tissue, things that alter muscle metabolism […]
‘Tis the season. Check out this video from YouTube explaining why certain species of reindeer do indeed have red noses. As Christmas draws near, these blood vessels will help keep Rudolphs’ nose warm as he leads the way for Santa’s sleigh. Sometimes I wish I had more blood vessels in my nose too as my nose is always cold in the winter.
Just in time for Thanksgiving… While wild turkeys are known to spend time in the snow, I read an interesting article about the effects of cold exposure on livestock during transport. According to the article, nearly all livestock animals are transported at some point in their life, which can be pretty stressful to the animals. In fact, some turkeys lose weight during transport and others do not even make it […]
Here’s something to think about. How do fish optimize gas exchange in their gills to efficiently take up oxygen (favoring large, thin, permeable membranes) while at the same time limiting water and ion movement across the surface? If they reduce surface area, then oxygen transfer will be limited, but ions and water transfer will be optimized. What is a fish to do? A new review article published in Physiology discussed how […]
As I prepare to leave the great city of New Orleans at the end of a fabulous conference, I can’t help but mention one final poster that I saw titled, “Depressing mitochondrial function during paradoxical anaerobism leads to an alcoholic fish.” It seemed appropriate given our conference hotel was on Bourbon Street. This poster, presented by Dr. Stanley Hillyard (University of Nevada – Las Vegas) examined desert pupfish (Cyprinodon spp). […]