On Sept. 30th, I'm going to be co-presenting a Bio-Link webinar on Genome Engineering with CRISPR-Cas9 with Dr. Thomas Tubon from Madison College. If you're interested, Register here. Since my part will be to help our audience understand the basics of this system, I prepared a short tutorial with Molecule World . Enjoy!
A Quick ... Read more
"By night all cats are gray" - Miguel Cervantes in Don Quixote
I've always liked Siamese cats. Students do, too. "Why Siamese cats wear masks" is always a favorite story in genetics class. So, when I opened my January copy of The Science Teacher, I was thrilled to see an article on Siamese cat colors and proteins AND molecular genetics (1). In the article, the authors (Todd and Kenyon) provide some background information on the enzymatic activity of tyrosinase and compare it to the catechol oxidase that ... Read more
Imagine a simple hike in a grassy part of South America. You hear a rattle and feel a quick stab of pain as fangs sink into your leg. Toxins in the snake venom travel through your blood vessels and penetrate your skin. If the snake is a South American rattlesnake, Crotalus terrific duressis, one of those toxins will be a phospholipase. Phospholipases attack cell and mitochondrial membranes destroying nerve and muscle function. Without quick treatment, a snakebite victim may be die or suffer permanent damage (1, 2).
The phospholipase from the South American rattlesnake is called ... Read more
When my parents were young, summer made cities a scary place for young families. My mother tells me children were often sent away from their homes to relatives in the country, if possible, and swimming pools were definitely off limits. The disease they feared, poliomyelitis, and the havoc it wrecked were the stuff of nightmares. Children could wake up with a headache and end up a few hours later, in an iron lung, struggling to breathe.
Although, I certainly didn't believe it. Truly in nature, it can be described as nonpareil.
With all the years that I've heard (or taught) that all DNA is antiparallel, it was hard to believe my own eyes when I saw this structure.
Yet here is, on the screen, parallel DNA.
The image that I posted a couple of days ago came from this same structure. In that image ... Read more