dr. dolittle | October 30, 2017You may be wondering why I have been so sentimental even though the year is not over yet. I am happy to inform you that it is not because I am retiring. On the contrary, I am packing up my virtual bags and moving this blog to a new site! Pardon the dust while we get settled into our new digs.
dr. dolittle | October 30, 2017And the #1 blog entry published thus far in 2017 discussed whether there was an evolutionary advantage to being stupid:
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As I was looking through the scientific literature the other day, I came across an article published in 1973, "The Evolutionary Advantages of Being Stupid." With a title like that, how could I not read it?
In this article Dr. Eugene D. Robin discussed how larger and more complex brains are associated with greater intelligence, which by evolutionary standards was thought to be related to "superiority." He described how this line of thinking places man at the peak of…
dr. dolittle | October 25, 2017Who could forget the second most popular blog post so far this year. Seeing an octopus walk never gets old!
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I came across this amazing video on YouTube showing a species of octopus found in Northern Australia that is adapted to walk on land:
dr. dolittle | October 23, 2017The #3 post so far this year explored how zebra finches reward themselves for singing well:
Dopamine is an important hormone released from neurons involved in reward pathways. Researchers at Cornell University wanted to know if dopamine signaling was involved in how birds learn songs. Their findings, recently published in Science, present evidence that neurons in the brain of zebra finches do in fact decrease dopamine signals when the birds hear an error in their song in comparison to when they sing 'correctly'. The researchers also found that dopamine signaling was enhanced when the birds…
dr. dolittle | October 19, 2017Here is the 4th most popular post so far this year:
Picture of a komodo dragon by CC BY-SA 3.0, via Wikimedia Commons
Researchers studying komodo dragons (Varanus komodoensis) at George Mason University discovered 48 previously unknown peptides in their blood that might have antimicrobial properties. Their findings were published in the Journal of Proteome Research. For the largest lizard, these peptides may help prevent the animals from getting infections from their own saliva, which is host to at least 57 species of bacteria. With this number of bacteria, it is easy to understand why…
dr. dolittle | October 17, 2017In looking back over the history of the blog, I thought it would be fun to take another glimpse at the top 5 most popular posts in 2017 thus far...
Image of lavender from GFDL 1.2, https://commons.wikimedia.org/w/index.php?curid=322384
While lavender aromatherapy has been documented to reduce stress in humans, little is known about its potential for reducing stress in veterinary medicine. Horses can develop elevated heart rates and stress hormone levels when they are confined to horse trailers and transported to new competition venues. Therapies to reduce stress in competition…
dr. dolittle | October 16, 2017It is hard to believe that I have been sharing my passion for comparative physiology and its application to human and animal health with you for over 7 years now! In reminiscing over the last 7 years, I thought it would be fun to look back at the most popular posts. So, here goes...
The most popular blog post since 2010 featured the adorable Venezuelan poodle moth...
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Posted August 29, 2012:
I was browsing through The Scientist and came across this image of a Venezuelan poodle moth that I could not resist sharing:
Image by: Arthur Anker on flickr. What is interesting about this…
dr. dolittle | September 30, 2017A new species of giant tree rats (Uromys vika) has been confirmed in the Solomon Islands! These rats can reach over 2 pounds and an impressive 1.5 feet in length. They can even break through coconuts with their teeth. I would not want to cross paths with one of these critters.
Sources:
Video: YouTube
TH Lavery, H Judge. A new species of giant rat (Muridae, Uromys) from Vangunu, Solomon Islands. Journal of Mammalogy, https://doi.org/10.1093/jmammal/gyx116 Published: 27 September 2017
dr. dolittle | September 28, 2017 Sara Letzner had humans compete against pigeons in a behavioural experiment. Photo from: Ruhr-Universitat at Bochum
A new study conducted by Drs. Sara Letzner and Onur Gunturkun (Ruhr-Universitat at Bochum) as well as Dr. Christian Beste (Technische Univeritat at Dresden) shows that pigeons are better than humans when it comes to multitasking. Their findings were published in Current Biology.
The findings from the study show that the mammalian cerebral cortex, with all of its cortical layers, is not the only type of brain that can perform complex tasks as birds do not have a…
dr. dolittle | September 27, 2017
Although female northern elephant seals only typically deliver one pup, females will sometimes nurse offspring from other mothers as in this photo by Brocken Inaglory via Wikimedia commons. A situation like this would result in less milk available to each nursing pup.
I just read an interesting paper published in Physiology. Animals periodically undergo periods of food deprivation such as during hibernation, mating, molting and migration. During these period of fasting, they become insulin resistant which helps to preserve glucose stores in the body. In this review, the…
dr. dolittle | September 25, 2017
When blood sugar concentrations are elevated, humans run the risk of glucose binding to proteins in the blood and causing the irreversible formation of advanced glycation end products (AGE). Once formed, AGEs can bind to their receptor (RAGE) and stimulate inflammation and oxidative stress. This pathological signaling can be stopped by pieces of the RAGE protein that break off and form a soluble version called sRAGE. These soluble versions of RAGE are good because they can bind excess AGEs and prevent their effects.
A new study published in the American Journal of Physiology -…
dr. dolittle | September 22, 2017 Image of cave dwelling Mexican tetra By Citron via Wikimedia Commons
Mexican tetra (Astyanax mexicanus) are a fascinating example of divergent evolution. Over time, some of these freshwater river fish washed into caves where they continue to live. With perpetual darkness, these cavefish have lost their ability to see along with their skin pigmentation. Oxygen and food are also hard to come by in the caves. In fact, the cave dwelling fish may go for months without eating as they wait for seasonal floods to deliver foods. Dr. Cliff Tabin (Harvard Medical School) recently presented his…
dr. dolittle | September 15, 2017 Photo of sea sponges by Steve Rupp, National Science Foundation via Wikimedia Commons
Through the course of evolution vertebrates have apparently lost their gene-encoded viral defense mechanisms. These ancient defenses allow plants and insects to silence the expression of certain genes by using what is known as RNA interference. This natural defense system can be manipulated to create genetically modified crops that resist certain infections. However, a new study by researchers from the University of Leuven in Belgium examined over 40 organisms in search of a specific family of proteins…
dr. dolittle | September 13, 2017
Image of a tammar wallaby and her joey By Mathae - Own work via Wikimedia Commons
When I think of marsupials, what comes to mind is an image of a mother carrying her young (joey) in a pouch. Contrary to popular belief, however, mother tammar wallabies (Macropus eugenii) have an internal functioning placenta. Albeit, it only develops near the end of their short pregnancy (a mere 26.5 days), just before the developing offspring moves from the uterus to the pouch for further development and nursing. A new study published in eLife examined gene expression in both the placenta and…
dr. dolittle | August 29, 2017
By U.S. Fish and Wildlife Service Headquarters [CC BY 2.0 (http://creativecommons.org/licenses/by/2.0) or Public domain], via Wikimedia Commons
Got bugs? Get a bat. As many species of bats are insectivores, they help keep insect populations in check. Hurricane Harvey has been devastating to people, animals and property. So it probably comes as no surprise that there are many volunteers dedicating their time to saving animals displaced by Hurricane Harvey as well. From squirrels, cats and dogs to...you guessed it...bats. It turns out that bats are not very…
dr. dolittle | August 29, 2017
Image source: Smithsonian Institution
You may recall prior Lifelines posts discussing the devastating effects of white nose syndrome (WNS) in bats. WNS, Pseudogymnoascus destructans is a fungus responsible for the deaths of millions of North American bats over the last ten years. In a new study published in the American Journal of Physiology - Regulatory, Integrative and Comparative Physiology, Dr. Craig Willis examined the effects of repeated arousals from hibernation induced by the fungal infection. Data from this new study provides evidence that infected animals do have…
dr. dolittle | August 29, 2017 Image of yellowfin tuna via Wikimedia Commons.
I love fishing. As with every fisherman, I have my fair share of "the one that got away" stories steeped in *mostly* truth. So, you can imagine my interest in reading research that shows fish appear to be shrinking in warming waters.
Warm waters carry less oxygen, which makes it difficult for fish to breath...especially larger fish. Metabolism is also higher in fish living in warm waters. Higher metabolism means the fish need more oxygen. The gills of fish are responsible for extracting oxygen from water and when they reach their maximum…
dr. dolittle | August 24, 2017
Image of a genetically obese mouse (left) from Wikipedia.
To deal with cold environments, mammals have several options. They could produce heat by increasing metabolism or shivering or they could conserve heat by constricting blood vessels in their skin or snuggling with a friend or insulating materials. With this in mind, researchers wondered how varying levels of insulation (obesity, fur) in mice affected heat loss and how much energy the animals used to maintain body heat. Their thinking was that more insulation would prevent heat loss and lower energy…
dr. dolittle | August 22, 2017
This is such a beautiful award-winning image of the complex vascular networks in a pigeon. The image was captured using CT scan technology and a novel contrasting agent called BriteVu that allows visualization of even tiny capillaries. This image was captured by Scott Echols who is a member of the Grey Parrot Anatomy Project, whose goals are to create technologies to study animal anatomy. The complex capillary network located in the neck of this pigeon is important in helping the animal regulate body temperature. Dilation of these blood vessels allows the birds to dissipate…
dr. dolittle | August 17, 2017
Image of an obese cat by Jami430 - Own work, CC BY-SA 4.0, via Wikimedia Commons
A new study conducted by the Banfield Pet Hospital (Vancouver, Washington) reports that as many as 1 in 3 dogs and cats living in the United States are overweight. The study was based on data collected by Banfield veterinary clinics on 2.5 million dogs and half a million cats over the past year.
Obesity in pets was not related to the weight status of their owners. In fact, overweight pets were less prevalent in states whose populations of humans were more overweight. They also found increased…