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molecular structures

Category archives for molecular structures

“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…

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…

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…

To have an effect, a molecule must bind to a receptor and trigger a signal.  Studying a receptor’s structure can give us insights about the way this triggering process works. Capsaicin is a fascinating molecule that puts the “pep” into peppers.  Curiously, the amount of capsaicin in a pepper is measured with a test devised in 1912 by…

Bio Databases 2015

Something interesting happened in 2014. The total number of databases that Nucleic Acids Research (NAR) tracks dropped by three databases! What happened?  Did people quit making databases?  No.  This year, the “dead” databases (links no longer valid) outnumber the new ones. To celebrate Digital World Biology’s release of Molecule World I’ll discuss some of the new structure databases…

Pull a spaghetti noodle out of a box of pasta and take a look.  It’s long and stiff.  Try to bend it and it breaks.  But fresh pasta is pliable.  It can fold just like cooked noodles. When students first look at an amino acid sequence, a long string of confusing letters, they often think those letters are…

On pinene and inhibiting enzymes. People of a certain age may remember a series of really funny commercials featuring Euell Gibbons and his famous question about whether you’ve ever eaten a pine tree.  “Some parts are edible” said Euell. Perhaps some parts are, but other pine tree products aren’t so nourishing.  Crystallography365, aka @Crystal_in_city  had a couple of…

In my last post, I wrote about insulin and interesting features of the insulin structure.  Some of the things I learned were really surprising.  For example, I was surprised to learn how similar pig and human insulin are.  I hadn’t considered this before, but this made me wonder about the human insulin we used to give…

Molecules of sucrose tore apart in their bellies letting glucose course free in their veins. Luckily for us, a system evolved long ago to capture that glucose and minimize it’s potential for damage. Removing sugar from the blood and sequestering it in liver, fat, and muscle cells, minimizes the harm that might result if sugars were free to…

Scale, proportion, and quantity belong to one of the cross cutting concepts in the next generation science standards (NGSS).  According to Volume 2 of the NGSS, “in engineering, no structure could be conceived much less constructed without the engineer’s precise sense of scale.”  The authors go on to note that scale and proportion are best understood using…