Life Lines by Dr. Dolittle

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Tag Archive for ‘metabolism’

Why shrews don’t need sweaters

Research presented by Dr. Tobias Fromme (Technical University of Munich) and colleagues at the 2021 Experimental Biology conference shows that Etruscan shrews (pictured above) have a rather large amount of fat located between their kidneys, which is close to their major blood vessels. This fat depot is a mixture of both brown and beige adipose tissue and is thought to help generate metabolic heat to keep these tiny mammals warm […]

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Experimental Biology 2021: Q&A with Molly Simonis

We are delighted to speak with Molly Simonis who is currently a PhD Candidate working with Dr. Lynn Hartzler at Wright State University. Molly is a member of the Comparative and Evolutionary Physiology section of the American Physiological Society and she presented her research “Captive Big Brown Bats (Eptesicus fuscus) Display Hypothermia and Hypometabolism” at the 2021 Experimental Biology conference last month. Q: What made you interested in studying big brown […]

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Extreme tolerance of dehydration stress

Talk about an extreme animal. During the rainy season annual killifish, Austrofundulus limnaeus, lay eggs that are resistant to droughts. This is an important attribute for a fish that lives in temporary pools of water. The stress-resistant embryos within the eggs literally shut down their metabolism to survive months – possibly years without water. For many fish, exposure to air (and oxygen) can cause profound oxidative stress. Remarkably, this is […]

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Extreme Fasting

While giant pandas roll in horse manure to stay warm in the winter (that’s a different story), other animals spend up to 8 months hibernating to conserve energy during times of reduced food availability and freezing temperatures. During their long winter’s nap, animals such as the Arctic ground squirrel and 13-lined ground squirrel go without food or water while at the same time avoiding muscle wasting – a rather impressive […]

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Live fast, die young

Researchers have long known that smaller animals have higher metabolisms and tend to die younger than larger animals. Think about it – a mouse typically only lives about 2 years whereas an elephant in the wild may live 50-70 years, depending on the species. After studying over 700 species of birds and 540 species of mammals, scientists discovered that migratory animals also live faster (mature and reproduce earlier) and die […]

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Getting louder costs more energy

Bats produce sounds to navigate their surroundings in a process called echolocation. The problem is that sound does not travel very well through air. To overcome this barrier, bats produce very high-intensity sounds. In fact, some bats can even produce sounds that are around 137 decibels sound pressure level (dB SPL), which is near the range that can cause hearing damage in people. Just like people, bats call at higher […]

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Cholesterol levels in tissues change during hypoxia in naked mole rats

Naked mole rats are rather famous from a physiological perspective for their amazing ability to live in hypoxic conditions. They do so in part by reducing their metabolic rate. In fact, researchers at the University of Ottawa in Canada showed that reducing environmental oxygen levels to 11% resulted in a 34% decrease in the animal’s metabolic rate. Studies of hypoxia-tolerant goldfish show that the animals respond to hypoxia challenges by […]

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What’s the buzz about bees?

We are excited to share the following interview with Dr. Lizzette Cambron, an NSF Graduate Fellow working in Dr. Kendra Greenlee’s laboratory at North Dakota State University. Dr. Cambron was scheduled to present her research at the 2020 Experimental Biology conference last month in a Comparative and Evolutionary Physiology session hosted by the American Physiological Society. As with many conferences, the meeting was cancelled due to Covid-19.  She has agreed […]

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Rapid switches in metabolism of hibernating animals

  In a new study published in the American Journal of Physiology – Regulatory, Integrative and Comparative Physiology, researchers examined how changes in metabolism during torpor are regulated in 13-lined ground squirrels (Ictidomys tridecemlineatus). During hibernation, these animals cycle between bouts of torpor (about 2 weeks each) when their metabolism is reduced by 95% and body temperature can drop to 5degC and short states of interbout euthermia when both temperature […]

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Mourning doves do not need to watch their figures

So jealous. Research presented by Anthony Basile, graduate student in the laboratory of Dr. Karen Sweazea at Arizona State University, at Experimental Biology 2019 examined how mourning doves would respond to a diet high in saturated fats. He reported on how mice fed a similar diet develop pathological changes in hormones and metabolism, as would be expected. But, doves fed a similar diet did not seem to show any notable […]

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