Bizarre Animal Courtships: The Power of Sexual Selection

In preparation for Valentine’s Day, humans across the world are investing in chocolates, flowers, lacy garments, and, for those who have read 50 Shades of Grey, perhaps a few additional supplies. For some of us, it’s the perfect excuse to stuff our faces with chocolate and sulk over singledom. In my case, I sat around craving chocolate and randomly announcing disturbing aspects of animal mating behavior to my resigned friends and family. In honor of this lovey-dovey holiday, I present a blog on how the epic battle to get laid has led to the development of some extremely peculiar methods of winning over a potential mate and competing with rivals.

The struggle is real, ladies and gents, and you’re not alone!

Valentines

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ANTHRAX: Bacillus anthracis

There’s nothing quite like a mail-order disease to propel a pathogen into notoriety. In 2001, several envelopes containing spores of the bacteria Bacillus anthracis were shipped across the United States, infecting those exposed with anthrax. This was hardly the first time B. anthracis cropped up as a prominent pathogen or agent of biological warfare; the bacterium has a sordid history as a major player in biological warfare in the past century, along with a biblical history of outbreaks.

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ALS: The Ice Bucket Disease

Amyotrophic lateral sclerosis

I was recently challenged to participate in the latest viral social behavior: the ice bucket challenge. The activity raises awareness for Amyotrophic lateral sclerosis, now more commonly known as ALS. I have decided to respond to the challenge with this blog post rather than pouring water over my head, since I’ve come to realize that watching over twenty ice challenge videos has taught me next to nothing about the disease!

ALS is both the most common and most aggressive type of adult motor neuron degeneration. The death of upper motor neurons in the motor cortex and lower motor neurons in the brainstem and ventral horn of the spinal cord result in a progressive loss of muscle control. This progression is characterized by stiffness, overactive reflexes, muscle twitching, muscle atrophy, and finally full paralysis. Approximately 15% of patients also suffer from cognitive and behavioral problems known as frontotemporal dementia due to the death of neurons in the prefrontal and temporal cortex in the brain[1,5].

Finally, it is a heterogeneous disease: the age, site of onset, rate of progression, and the presence and degree of cognitive dysfunction can vary widely between patients. The disease is fatal within 3-5 years of onset[5].

ALS bucket time

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Ebola

No other disease has captured the modern imagination with such sensational horror as Ebola. The possibility of infection being transported into dense cities and the western world along with the possibility of bioterrorism captures our attention. However, much of the disease’s infamous reputation is due to sensationalized stories of the outbreaks along with the popular perception of the disease causing a disconcerting amount of bleeding from every orifice. In actuality, the disease’s outbreaks are relatively rare (although increasing) and the presentation itself only includes external bleeding in less than half of the cases. Still, with a mortality rate ranging between 40-90% and no current treatments, Ebola is not a disease to be taken lightly.

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Moves and Jobs

Hello folks! I was going to have a post all about Ebola for you this Monday, however real life duties have temporarily forced my blog to the back burner. I am moving to a new city tomorrow to start a new job, which is pretty exciting but unfortunately also very time consuming. I hope to be settled in within a week or two, at which point I can get back to work on my post for you all. Thank you for your patience, and I’m looking forward to posting all about diseases again shortly!

Venom: Nature’s Deadliest Creatures

Animals have been evolving toxins for millions of years, perfecting the art of paralyzing prey, killing targets, and deterring predators. While poison is either ingested or inhaled, venom is toxin delivered directly into the target’s circulation by means of a bite, sting, or other rudely penetrative means. Even the more mild venoms from tiny insects are impressively efficient; a bee can create havoc in an animal hundreds of times its own mass (a 1/10 gram bee compared to a 70 kilogram human).

Despite the fact that some of us experience complete mental breakdowns the minute a venomous creature passes by, humans have been harvesting and utilizing animal venom for hundreds of years. The key to many of these toxins is their astonishing specificity; they bind to an exact spot on a specific protein in only certain types of cell to achieve an precise, and devastating, effect. This incredible feat is far beyond our own ability to engineer, and so we study these toxins, altering them for use in life-saving therapies and medicines. In order to celebrate these amazing chemicals (and because venomous animals are too cool to pass up), let’s see how some of the deadliest venoms work.

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Vaccines: Disease, Eradication, Misinformation, and Reemergence

No one really likes vaccinations. Children view the procedure with the trepidation of a victim being pursued by a madman with a butcher’s knife, while parents make soothing, inane comments to their terrified offspring, such as “the sharp, pointy weapon is nothing to be afraid of!” as they are forced to pry their children from underneath the doctor’s table (my sister was particularly prone to this type of needle-avoidance). Personally, I view my own shots with a perverse fascination, but that probably comes from being, as my parents say, ‘an unusual child.’ In general, vaccinations are viewed by both parents and patients with resigned acceptance, although in the past decade there has been an upsurge of media attention toward possible side effects. Some individuals have become leery of the procedure, choosing to keep their children unvaccinated. Just how much of these concerns are based on truth, and how much stems from misinformation?

It is important to understand the science behind vaccinations, and the process of development, before jumping to conclusions. Vaccines have provided relief from decimating diseases, even eradicating mass killers such as smallpox. They are an unparalleled scientific miracle, which utilizes the wonders of our own immune system to provide protection from deadly diseases.

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