Archive | September 2012

Zombie Cockroaches

Zombie Cockroaches
By Lance Gritton MAEd
Normally I try to be clever with my titles to invite the curious to read, but this week as we say in the lab “it is what it is” and nothing more. We’re talking zombie cockroaches, and it’s not even the Election er Halloween yet!
A few years ago, some engineering students put tiny side thrusting rockets on a Madagascar Hissing cockroach, a rather large insect. The engineering aspects were to track how stable a six legged robot could be even when rockets were trying to move it off course. In reality, some grad student said “Rockets on a cockroach? Yeh!” Ok. Maybe not, but I would have. A six legged all terrain robot could handle odd stresses and carry more varied weapons and instruments than a two or four legged robot could. So by measuring how well the roach could walk in a straight line with sideways rockets blasting, it showed just that.
Tiny insect sized sensors have been around for a decade, including a camera that could be mounted on a roach as well. Now some of you are asking, why cockroaches and not some cuddly other insect. Well cockroaches are big, strong and breed like…roaches, so they are used quite a bit in the miniature world. Roaches are also social insects, with a society just as complex as many wasp species. Young roaches that are raises alone, have trouble when put in a social nest they normally would grow up in. We find similar behavior in rats and apes. And roaches groom themselves often, making them a clean species (except they defecate everywhere to mark nest mates paths, and that’s efficient for roaches, but yuck for us).
One thing scientists and engineers look for inspiration is evolution. A gorgeous creature is an electric emerald green with some red accents…a beauty by any standards. This is the emerald cockroach wasp. She is about 1/50th the size of the roaches she hunts, and could never carry one or even drag one off like her cousin the tarantula hawk. But she needs to get a cockroach to her den so she can lay an egg on it. To do so, she is a micro-surgeon with wings.
She has a long flexible stinger and special venom. When she spots a victim (a cockroach in case you haven’t been keeping up), she stings it in its ganglion, or nerve bunch that is kind of like a brain. This makes the cockroach immediately start to groom itself, and then it gets a little groggy, and the front legs stop working. She then stings it again, and chews off half of each of the roaches antennae. Some scientists think she does this to replenish the proteins needed for more venom. Whatever the case, she then grasps the antennae and leads the now zombie cockroach along with its antenna acting like a leash, and walks it to her nest. She then lays a single egg and the roach lays down and waits to be eaten skillfully from the inside out; the larva avoids all organs until last and then pupates and emerges in about a week as a new zombie maker. (That is so cool!)
A couple of engineers at NC State wanted to try something, less chemical, and nerdier. Using magnets and medical grade glue, they affixed back pack like integrated circuits, with electrodes glued on to the roach’s antennae. Using a wireless transmitter, they were able to “buzz” the roach’s antennae, right or left or both. They were able to drive the insect along a track and make it move just like an RC car. Now if you’re wondering why this is not just a do it yourself Frankenstein kit, there are real reasons for this wireless roach research (cool band name), read on.
A few years ago, an invention called Brain Port came out to allow blind people to see using the senses on the tongue. A sensor was clipped to the tongue, and the wires sent down to a control pack held in the hand. The next generation that came around was muscle controlled prosthetic limbs, which evolved into limbs that could be controlled with thought. But these are very cool experiments that really work on the nervous system. What about the brain itself?
Scientists have implanted chips into animal brains, with the most recent a monkey that allow neural connections to be made. They wired up the cerebral cortex, and stimulated the connection as the monkey was learning new patterns and shapes. By stimulating these two layers they found the monkeys learned and remembered things at an increase of up to 75%. This might be the steps to finding a cure for dementia and other brain maladies.
I’ll take two please…
Later Ya’ll


Glacier Mice

Ice Mice
By Lance Gritton MAEd
Riddle me this: When is a mouse not a mouse and an insect not an insect? When it’s winter on a glacier! (Hey I know it’s not a good riddle, but then you’re probably not a good Batman either). I know it’s one of the hottest summers on record and why am I talking about winter stuff? It keeps me cool that’s why. But glacier mice are all about keeping warm.
Glaciers are long rivers of ice made of packed snow that flow down a mountain. They are a year round water supply for millions of people around the world. Most contain some algae of some sort, and the ice and rocks that flow carve out smooth passes in the mountains, and boulders are relocated in a slow steady transit. For hundreds of years, it was assumed nothing could live on this bleak cold patch, but that’s what is so cool about science; it’s what you learn after you know it all that counts. Winds blow across these flat open areas and organic material is deposited on the surface. Now, anyone who cooks knows that the bane of tomatoes and fresh bread is mold. It’s everywhere, and it doesn’t care the season or if you refrigerate or leave it on the counter, it still grows if the food is left alone. Same thing happens on glaciers.
Molds are a member of the Fungi kingdom; a large kingdom of life with about 1.5 million species, so it’s not surprising that it can attack our produce no matter how we store it. It only needs water, and something to eat to live, and that can be just about anything that is alive or once was alive (like that organic material found blowing on and around glacier ice). Fungi are often confused with plants, and for a time, were thought to be plants. But they have no chloroplasts, the green little organs in plants that allow them to take the energy of the Sun and build complex sugar and protein molecules. Fungi are called reducers, because the break down complex molecules into simpler ones that it can eat. And plants store their food they make in starches; fungi store their food in glycogen, the same molecule we store it in for short term energy.
Now as certain species of fungi, that love cold, are blown across the glaciers, they start to grow on those organic molecules and get bigger. Now if you clean house like I do, from time to time, you might find bits of dust and hair clinging to together to make what one might call a dust bunny. Not a very good name, but the fluffiness makes one think of a bunny. (I think dust sheep was a better name but I digress). The fungi blowing across the ice do the same thing. They pick up bits of organic matter and inorganic stuff like dirt and dust and they get matted together in the long strands of the fungi (called hyphae, but that’s not important.) As they blow and grow, they roll around and form a sort of ball of fungi and dirt. These things get pretty big, about 7-8 centimeters (3-3.5 inches). Explorers of all nationalities have found these since they started, well exploring glaciers. (Too bad hacky sacks hadn’t been invented; they might have given some explorers something to do but watch slow ice move).
These balls of fungi were given the name glacier mice (maybe snipe hunting was just a little too far to go on open ice, so these were given that colorful name). Now these things like I said have been around for hundreds, maybe thousands of years. They were blowing in the wind and few thought much about them. But then some curious folk decided to look more closely at them; where else, but Iceland.
Drs. Steve Coulson an Arctic biologist form Norway, and Nicholas Midgley from Nottingham Trent University, England, thought that these glacial tumbleweeds must pick up a large bit of dust and moisture on the travels being blown across the glacial surface. What they didn’t know was if the inside of this glacier mouse was warmer and maybe even more hospitable than the ice itself, so they took some from various glaciers and dissected them.
Inside the glacier mice, a pocket of dirt and water (read that organic life type stuff) was found along with a few unusual critters. Collembola, or spring tails are a common winter animal. I say animal because they have been kicked out of the insect phylum, and put in a phylum of their own, but I digress. These winter denizens can be found worldwide along with tardigrada, or water bears, and a few nematodes or worms were found living in these fungal balls.
I’m glad someone else studies that.
Later Ya’ll